path: root/configure

#!/bin/sh
#
# FFmpeg configure script
#
# Copyright (c) 2000-2002 Fabrice Bellard
# Copyright (c) 2005-2008 Diego Biurrun
# Copyright (c) 2005-2008 Mans Rullgard
#

# Prevent locale nonsense from breaking basic text processing.
LC_ALL=C
export LC_ALL

# make sure we are running under a compatible shell
# try to make this part work with most shells

try_exec(){
    echo "Trying shell $1"
    type "$1" > /dev/null 2>&1 && exec "$@"
}

unset foo
(: ${foo%%bar}) 2> /dev/null
E1="$?"

(: ${foo?}) 2> /dev/null
E2="$?"

if test "$E1" != 0 || test "$E2" = 0; then
    echo "Broken shell detected.  Trying alternatives."
    export FF_CONF_EXEC
    if test "0$FF_CONF_EXEC" -lt 1; then
        FF_CONF_EXEC=1
        try_exec bash "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 2; then
        FF_CONF_EXEC=2
        try_exec ksh "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 3; then
        FF_CONF_EXEC=3
        try_exec /usr/xpg4/bin/sh "$0" "$@"
    fi
    echo "No compatible shell script interpreter found."
    echo "This configure script requires a POSIX-compatible shell"
    echo "such as bash or ksh."
    echo "THIS IS NOT A BUG IN FFMPEG, DO NOT REPORT IT AS SUCH."
    echo "Instead, install a working POSIX-compatible shell."
    echo "Disabling this configure test will create a broken FFmpeg."
    if test "$BASH_VERSION" = '2.04.0(1)-release'; then
        echo "This bash version ($BASH_VERSION) is broken on your platform."
        echo "Upgrade to a later version if available."
    fi
    exit 1
fi

test -d /usr/xpg4/bin && PATH=/usr/xpg4/bin:$PATH

show_help(){
    cat <<EOF
Usage: configure [options]
Options: [defaults in brackets after descriptions]

Help options:
  --help                   print this message
  --quiet                  Suppress showing informative output
  --list-decoders          show all available decoders
  --list-encoders          show all available encoders
  --list-hwaccels          show all available hardware accelerators
  --list-demuxers          show all available demuxers
  --list-muxers            show all available muxers
  --list-parsers           show all available parsers
  --list-protocols         show all available protocols
  --list-bsfs              show all available bitstream filters
  --list-indevs            show all available input devices
  --list-outdevs           show all available output devices
  --list-filters           show all available filters

Standard options:
  --logfile=FILE           log tests and output to FILE [ffbuild/config.log]
  --disable-logging        do not log configure debug information
  --fatal-warnings         fail if any configure warning is generated
  --prefix=PREFIX          install in PREFIX [$prefix_default]
  --bindir=DIR             install binaries in DIR [PREFIX/bin]
  --datadir=DIR            install data files in DIR [PREFIX/share/ffmpeg]
  --docdir=DIR             install documentation in DIR [PREFIX/share/doc/ffmpeg]
  --libdir=DIR             install libs in DIR [PREFIX/lib]
  --shlibdir=DIR           install shared libs in DIR [LIBDIR]
  --incdir=DIR             install includes in DIR [PREFIX/include]
  --mandir=DIR             install man page in DIR [PREFIX/share/man]
  --pkgconfigdir=DIR       install pkg-config files in DIR [LIBDIR/pkgconfig]
  --enable-rpath           use rpath to allow installing libraries in paths
                           not part of the dynamic linker search path
                           use rpath when linking programs (USE WITH CARE)
  --install-name-dir=DIR   Darwin directory name for installed targets

Licensing options:
  --enable-gpl             allow use of GPL code, the resulting libs
                           and binaries will be under GPL [no]
  --enable-version3        upgrade (L)GPL to version 3 [no]
  --enable-nonfree         allow use of nonfree code, the resulting libs
                           and binaries will be unredistributable [no]

Configuration options:
  --disable-static         do not build static libraries [no]
  --enable-shared          build shared libraries [no]
  --enable-small           optimize for size instead of speed
  --disable-runtime-cpudetect disable detecting CPU capabilities at runtime (smaller binary)
  --enable-gray            enable full grayscale support (slower color)
  --disable-swscale-alpha  disable alpha channel support in swscale
  --disable-all            disable building components, libraries and programs
  --disable-autodetect     disable automatically detected external libraries [no]

Program options:
  --disable-programs       do not build command line programs
  --disable-ffmpeg         disable ffmpeg build
  --disable-ffplay         disable ffplay build
  --disable-ffprobe        disable ffprobe build

Documentation options:
  --disable-doc            do not build documentation
  --disable-htmlpages      do not build HTML documentation pages
  --disable-manpages       do not build man documentation pages
  --disable-podpages       do not build POD documentation pages
  --disable-txtpages       do not build text documentation pages

Component options:
  --disable-avdevice       disable libavdevice build
  --disable-avcodec        disable libavcodec build
  --disable-avformat       disable libavformat build
  --disable-swresample     disable libswresample build
  --disable-swscale        disable libswscale build
  --disable-postproc       disable libpostproc build
  --disable-avfilter       disable libavfilter build
  --disable-pthreads       disable pthreads [autodetect]
  --disable-w32threads     disable Win32 threads [autodetect]
  --disable-os2threads     disable OS/2 threads [autodetect]
  --disable-network        disable network support [no]
  --disable-dct            disable DCT code
  --disable-dwt            disable DWT code
  --disable-error-resilience disable error resilience code
  --disable-lsp            disable LSP code
  --disable-lzo            disable LZO decoder code
  --disable-mdct           disable MDCT code
  --disable-rdft           disable RDFT code
  --disable-fft            disable FFT code
  --disable-faan           disable floating point AAN (I)DCT code
  --disable-pixelutils     disable pixel utils in libavutil

Individual component options:
  --disable-everything     disable all components listed below
  --disable-encoder=NAME   disable encoder NAME
  --enable-encoder=NAME    enable encoder NAME
  --disable-encoders       disable all encoders
  --disable-decoder=NAME   disable decoder NAME
  --enable-decoder=NAME    enable decoder NAME
  --disable-decoders       disable all decoders
  --disable-hwaccel=NAME   disable hwaccel NAME
  --enable-hwaccel=NAME    enable hwaccel NAME
  --disable-hwaccels       disable all hwaccels
  --disable-muxer=NAME     disable muxer NAME
  --enable-muxer=NAME      enable muxer NAME
  --disable-muxers         disable all muxers
  --disable-demuxer=NAME   disable demuxer NAME
  --enable-demuxer=NAME    enable demuxer NAME
  --disable-demuxers       disable all demuxers
  --enable-parser=NAME     enable parser NAME
  --disable-parser=NAME    disable parser NAME
  --disable-parsers        disable all parsers
  --enable-bsf=NAME        enable bitstream filter NAME
  --disable-bsf=NAME       disable bitstream filter NAME
  --disable-bsfs           disable all bitstream filters
  --enable-protocol=NAME   enable protocol NAME
  --disable-protocol=NAME  disable protocol NAME
  --disable-protocols      disable all protocols
  --enable-indev=NAME      enable input device NAME
  --disable-indev=NAME     disable input device NAME
  --disable-indevs         disable input devices
  --enable-outdev=NAME     enable output device NAME
  --disable-outdev=NAME    disable output device NAME
  --disable-outdevs        disable output devices
  --disable-devices        disable all devices
  --enable-filter=NAME     enable filter NAME
  --disable-filter=NAME    disable filter NAME
  --disable-filters        disable all filters

External library support:

  Using any of the following switches will allow FFmpeg to link to the
  corresponding external library. All the components depending on that library
  will become enabled, if all their other dependencies are met and they are not
  explicitly disabled. E.g. --enable-libopus will enable linking to
  libopus and allow the libopus encoder to be built, unless it is
  specifically disabled with --disable-encoder=libopus.

  Note that only the system libraries are auto-detected. All the other external
  libraries must be explicitly enabled.

  Also note that the following help text describes the purpose of the libraries
  themselves, not all their features will necessarily be usable by FFmpeg.

  --disable-alsa           disable ALSA support [autodetect]
  --disable-appkit         disable Apple AppKit framework [autodetect]
  --disable-avfoundation   disable Apple AVFoundation framework [autodetect]
  --enable-avisynth        enable reading of AviSynth script files [no]
  --disable-bzlib          disable bzlib [autodetect]
  --disable-coreimage      disable Apple CoreImage framework [autodetect]
  --enable-chromaprint     enable audio fingerprinting with chromaprint [no]
  --enable-frei0r          enable frei0r video filtering [no]
  --enable-gcrypt          enable gcrypt, needed for rtmp(t)e support
                           if openssl, librtmp or gmp is not used [no]
  --enable-gmp             enable gmp, needed for rtmp(t)e support
                           if openssl or librtmp is not used [no]
  --enable-gnutls          enable gnutls, needed for https support
                           if openssl, libtls or mbedtls is not used [no]
  --disable-iconv          disable iconv [autodetect]
  --enable-jni             enable JNI support [no]
  --enable-ladspa          enable LADSPA audio filtering [no]
  --enable-libaom          enable AV1 video encoding/decoding via libaom [no]
  --enable-libaribb24      enable ARIB text and caption decoding via libaribb24 [no]
  --enable-libass          enable libass subtitles rendering,
                           needed for subtitles and ass filter [no]
  --enable-libbluray       enable BluRay reading using libbluray [no]
  --enable-libbs2b         enable bs2b DSP library [no]
  --enable-libcaca         enable textual display using libcaca [no]
  --enable-libcelt         enable CELT decoding via libcelt [no]
  --enable-libcdio         enable audio CD grabbing with libcdio [no]
  --enable-libcodec2       enable codec2 en/decoding using libcodec2 [no]
  --enable-libdav1d        enable AV1 decoding via libdav1d [no]
  --enable-libdavs2        enable AVS2 decoding via libdavs2 [no]
  --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394
                           and libraw1394 [no]
  --enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]
  --enable-libflite        enable flite (voice synthesis) support via libflite [no]
  --enable-libfontconfig   enable libfontconfig, useful for drawtext filter [no]
  --enable-libfreetype     enable libfreetype, needed for drawtext filter [no]
  --enable-libfribidi      enable libfribidi, improves drawtext filter [no]
  --enable-libglslang      enable GLSL->SPIRV compilation via libglslang [no]
  --enable-libgme          enable Game Music Emu via libgme [no]
  --enable-libgsm          enable GSM de/encoding via libgsm [no]
  --enable-libiec61883     enable iec61883 via libiec61883 [no]
  --enable-libilbc         enable iLBC de/encoding via libilbc [no]
  --enable-libjack         enable JACK audio sound server [no]
  --enable-libklvanc       enable Kernel Labs VANC processing [no]
  --enable-libkvazaar      enable HEVC encoding via libkvazaar [no]
  --enable-liblensfun      enable lensfun lens correction [no]
  --enable-libmodplug      enable ModPlug via libmodplug [no]
  --enable-libmp3lame      enable MP3 encoding via libmp3lame [no]
  --enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]
  --enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
  --enable-libopencv       enable video filtering via libopencv [no]
  --enable-libopenh264     enable H.264 encoding via OpenH264 [no]
  --enable-libopenjpeg     enable JPEG 2000 de/encoding via OpenJPEG [no]
  --enable-libopenmpt      enable decoding tracked files via libopenmpt [no]
  --enable-libopenvino     enable OpenVINO as a DNN module backend
                           for DNN based filters like dnn_processing [no]
  --enable-libopus         enable Opus de/encoding via libopus [no]
  --enable-libpulse        enable Pulseaudio input via libpulse [no]
  --enable-librabbitmq     enable RabbitMQ library [no]
  --enable-librav1e        enable AV1 encoding via rav1e [no]
  --enable-librist         enable RIST via librist [no]
  --enable-librsvg         enable SVG rasterization via librsvg [no]
  --enable-librubberband   enable rubberband needed for rubberband filter [no]
  --enable-librtmp         enable RTMP[E] support via librtmp [no]
  --enable-libshaderc      enable GLSL->SPIRV compilation via libshaderc [no]
  --enable-libshine        enable fixed-point MP3 encoding via libshine [no]
  --enable-libsmbclient    enable Samba protocol via libsmbclient [no]
  --enable-libsnappy       enable Snappy compression, needed for hap encoding [no]
  --enable-libsoxr         enable Include libsoxr resampling [no]
  --enable-libspeex        enable Speex de/encoding via libspeex [no]
  --enable-libsrt          enable Haivision SRT protocol via libsrt [no]
  --enable-libssh          enable SFTP protocol via libssh [no]
  --enable-libsvtav1       enable AV1 encoding via SVT [no]
  --enable-libtensorflow   enable TensorFlow as a DNN module backend
                           for DNN based filters like sr [no]
  --enable-libtesseract    enable Tesseract, needed for ocr filter [no]
  --enable-libtheora       enable Theora encoding via libtheora [no]
  --enable-libtls          enable LibreSSL (via libtls), needed for https support
                           if openssl, gnutls or mbedtls is not used [no]
  --enable-libtwolame      enable MP2 encoding via libtwolame [no]
  --enable-libuavs3d       enable AVS3 decoding via libuavs3d [no]
  --enable-libv4l2         enable libv4l2/v4l-utils [no]
  --enable-libvidstab      enable video stabilization using vid.stab [no]
  --enable-libvmaf         enable vmaf filter via libvmaf [no]
  --enable-libvo-amrwbenc  enable AMR-WB encoding via libvo-amrwbenc [no]
  --enable-libvorbis       enable Vorbis en/decoding via libvorbis,
                           native implementation exists [no]
  --enable-libvpx          enable VP8 and VP9 de/encoding via libvpx [no]
  --enable-libwebp         enable WebP encoding via libwebp [no]
  --enable-libx264         enable H.264 encoding via x264 [no]
  --enable-libx265         enable HEVC encoding via x265 [no]
  --enable-libxavs         enable AVS encoding via xavs [no]
  --enable-libxavs2        enable AVS2 encoding via xavs2 [no]
  --enable-libxcb          enable X11 grabbing using XCB [autodetect]
  --enable-libxcb-shm      enable X11 grabbing shm communication [autodetect]
  --enable-libxcb-xfixes   enable X11 grabbing mouse rendering [autodetect]
  --enable-libxcb-shape    enable X11 grabbing shape rendering [autodetect]
  --enable-libxvid         enable Xvid encoding via xvidcore,
                           native MPEG-4/Xvid encoder exists [no]
  --enable-libxml2         enable XML parsing using the C library libxml2, needed
                           for dash and imf demuxing support [no]
  --enable-libzimg         enable z.lib, needed for zscale filter [no]
  --enable-libzmq          enable message passing via libzmq [no]
  --enable-libzvbi         enable teletext support via libzvbi [no]
  --enable-lv2             enable LV2 audio filtering [no]
  --disable-lzma           disable lzma [autodetect]
  --enable-decklink        enable Blackmagic DeckLink I/O support [no]
  --enable-mbedtls         enable mbedTLS, needed for https support
                           if openssl, gnutls or libtls is not used [no]
  --enable-mediacodec      enable Android MediaCodec support [no]
  --enable-mediafoundation enable encoding via MediaFoundation [auto]
  --disable-metal          disable Apple Metal framework [autodetect]
  --enable-libmysofa       enable libmysofa, needed for sofalizer filter [no]
  --enable-openal          enable OpenAL 1.1 capture support [no]
  --enable-opencl          enable OpenCL processing [no]
  --enable-opengl          enable OpenGL rendering [no]
  --enable-openssl         enable openssl, needed for https support
                           if gnutls, libtls or mbedtls is not used [no]
  --enable-pocketsphinx    enable PocketSphinx, needed for asr filter [no]
  --disable-sndio          disable sndio support [autodetect]
  --disable-schannel       disable SChannel SSP, needed for TLS support on
                           Windows if openssl and gnutls are not used [autodetect]
  --disable-sdl2           disable sdl2 [autodetect]
  --disable-securetransport disable Secure Transport, needed for TLS support
                           on OSX if openssl and gnutls are not used [autodetect]
  --enable-vapoursynth     enable VapourSynth demuxer [no]
  --disable-vulkan         disable Vulkan code [autodetect]
  --disable-xlib           disable xlib [autodetect]
  --disable-zlib           disable zlib [autodetect]

  The following libraries provide various hardware acceleration features:
  --disable-amf            disable AMF video encoding code [autodetect]
  --disable-audiotoolbox   disable Apple AudioToolbox code [autodetect]
  --enable-cuda-nvcc       enable Nvidia CUDA compiler [no]
  --disable-cuda-llvm      disable CUDA compilation using clang [autodetect]
  --disable-cuvid          disable Nvidia CUVID support [autodetect]
  --disable-d3d11va        disable Microsoft Direct3D 11 video acceleration code [autodetect]
  --disable-dxva2          disable Microsoft DirectX 9 video acceleration code [autodetect]
  --disable-ffnvcodec      disable dynamically linked Nvidia code [autodetect]
  --enable-libdrm          enable DRM code (Linux) [no]
  --enable-libmfx          enable Intel MediaSDK (AKA Quick Sync Video) code via libmfx [no]
  --enable-libnpp          enable Nvidia Performance Primitives-based code [no]
  --enable-mmal            enable Broadcom Multi-Media Abstraction Layer (Raspberry Pi) via MMAL [no]
  --disable-nvdec          disable Nvidia video decoding acceleration (via hwaccel) [autodetect]
  --disable-nvenc          disable Nvidia video encoding code [autodetect]
  --enable-omx             enable OpenMAX IL code [no]
  --enable-omx-rpi         enable OpenMAX IL code for Raspberry Pi [no]
  --enable-rkmpp           enable Rockchip Media Process Platform code [no]
  --disable-v4l2-m2m       disable V4L2 mem2mem code [autodetect]
  --disable-vaapi          disable Video Acceleration API (mainly Unix/Intel) code [autodetect]
  --disable-vdpau          disable Nvidia Video Decode and Presentation API for Unix code [autodetect]
  --disable-videotoolbox   disable VideoToolbox code [autodetect]

Toolchain options:
  --arch=ARCH              select architecture [$arch]
  --cpu=CPU                select the minimum required CPU (affects
                           instruction selection, may crash on older CPUs)
  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]
  --progs-suffix=SUFFIX    program name suffix []
  --enable-cross-compile   assume a cross-compiler is used
  --sysroot=PATH           root of cross-build tree
  --sysinclude=PATH        location of cross-build system headers
  --target-os=OS           compiler targets OS [$target_os]
  --target-exec=CMD        command to run executables on target
  --target-path=DIR        path to view of build directory on target
  --target-samples=DIR     path to samples directory on target
  --tempprefix=PATH        force fixed dir/prefix instead of mktemp for checks
  --toolchain=NAME         set tool defaults according to NAME
                           (gcc-asan, clang-asan, gcc-msan, clang-msan,
                           gcc-tsan, clang-tsan, gcc-usan, clang-usan,
                           valgrind-massif, valgrind-memcheck,
                           msvc, icl, gcov, llvm-cov, hardened)
  --nm=NM                  use nm tool NM [$nm_default]
  --ar=AR                  use archive tool AR [$ar_default]
  --as=AS                  use assembler AS [$as_default]
  --ln_s=LN_S              use symbolic link tool LN_S [$ln_s_default]
  --strip=STRIP            use strip tool STRIP [$strip_default]
  --windres=WINDRES        use windows resource compiler WINDRES [$windres_default]
  --x86asmexe=EXE          use nasm-compatible assembler EXE [$x86asmexe_default]
  --cc=CC                  use C compiler CC [$cc_default]
  --cxx=CXX                use C compiler CXX [$cxx_default]
  --objcc=OCC              use ObjC compiler OCC [$cc_default]
  --dep-cc=DEPCC           use dependency generator DEPCC [$cc_default]
  --nvcc=NVCC              use Nvidia CUDA compiler NVCC or clang [$nvcc_default]
  --ld=LD                  use linker LD [$ld_default]
  --metalcc=METALCC        use metal compiler METALCC [$metalcc_default]
  --metallib=METALLIB      use metal linker METALLIB [$metallib_default]
  --pkg-config=PKGCONFIG   use pkg-config tool PKGCONFIG [$pkg_config_default]
  --pkg-config-flags=FLAGS pass additional flags to pkgconf []
  --ranlib=RANLIB          use ranlib RANLIB [$ranlib_default]
  --doxygen=DOXYGEN        use DOXYGEN to generate API doc [$doxygen_default]
  --host-cc=HOSTCC         use host C compiler HOSTCC
  --host-cflags=HCFLAGS    use HCFLAGS when compiling for host
  --host-cppflags=HCPPFLAGS use HCPPFLAGS when compiling for host
  --host-ld=HOSTLD         use host linker HOSTLD
  --host-ldflags=HLDFLAGS  use HLDFLAGS when linking for host
  --host-extralibs=HLIBS   use libs HLIBS when linking for host
  --host-os=OS             compiler host OS [$target_os]
  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]
  --extra-cxxflags=ECFLAGS add ECFLAGS to CXXFLAGS [$CXXFLAGS]
  --extra-objcflags=FLAGS  add FLAGS to OBJCFLAGS [$CFLAGS]
  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]
  --extra-ldexeflags=ELDFLAGS add ELDFLAGS to LDEXEFLAGS [$LDEXEFLAGS]
  --extra-ldsoflags=ELDFLAGS add ELDFLAGS to LDSOFLAGS [$LDSOFLAGS]
  --extra-libs=ELIBS       add ELIBS [$ELIBS]
  --extra-version=STRING   version string suffix []
  --optflags=OPTFLAGS      override optimization-related compiler flags
  --nvccflags=NVCCFLAGS    override nvcc flags [$nvccflags_default]
  --build-suffix=SUFFIX    library name suffix []
  --enable-pic             build position-independent code
  --enable-thumb           compile for Thumb instruction set
  --enable-lto             use link-time optimization
  --env="ENV=override"     override the environment variables

Advanced options (experts only):
  --malloc-prefix=PREFIX   prefix malloc and related names with PREFIX
  --custom-allocator=NAME  use a supported custom allocator
  --disable-symver         disable symbol versioning
  --enable-hardcoded-tables use hardcoded tables instead of runtime generation
  --disable-safe-bitstream-reader
                           disable buffer boundary checking in bitreaders
                           (faster, but may crash)
  --sws-max-filter-size=N  the max filter size swscale uses [$sws_max_filter_size_default]

Optimization options (experts only):
  --disable-asm            disable all assembly optimizations
  --disable-altivec        disable AltiVec optimizations
  --disable-vsx            disable VSX optimizations
  --disable-power8         disable POWER8 optimizations
  --disable-amd3dnow       disable 3DNow! optimizations
  --disable-amd3dnowext    disable 3DNow! extended optimizations
  --disable-mmx            disable MMX optimizations
  --disable-mmxext         disable MMXEXT optimizations
  --disable-sse            disable SSE optimizations
  --disable-sse2           disable SSE2 optimizations
  --disable-sse3           disable SSE3 optimizations
  --disable-ssse3          disable SSSE3 optimizations
  --disable-sse4           disable SSE4 optimizations
  --disable-sse42          disable SSE4.2 optimizations
  --disable-avx            disable AVX optimizations
  --disable-xop            disable XOP optimizations
  --disable-fma3           disable FMA3 optimizations
  --disable-fma4           disable FMA4 optimizations
  --disable-avx2           disable AVX2 optimizations
  --disable-avx512         disable AVX-512 optimizations
  --disable-aesni          disable AESNI optimizations
  --disable-armv5te        disable armv5te optimizations
  --disable-armv6          disable armv6 optimizations
  --disable-armv6t2        disable armv6t2 optimizations
  --disable-vfp            disable VFP optimizations
  --disable-neon           disable NEON optimizations
  --disable-inline-asm     disable use of inline assembly
  --disable-x86asm         disable use of standalone x86 assembly
  --disable-mipsdsp        disable MIPS DSP ASE R1 optimizations
  --disable-mipsdspr2      disable MIPS DSP ASE R2 optimizations
  --disable-msa            disable MSA optimizations
  --disable-mipsfpu        disable floating point MIPS optimizations
  --disable-mmi            disable Loongson MMI optimizations
  --disable-lsx            disable Loongson LSX optimizations
  --disable-lasx           disable Loongson LASX optimizations
  --disable-fast-unaligned consider unaligned accesses slow

Developer options (useful when working on FFmpeg itself):
  --disable-debug          disable debugging symbols
  --enable-debug=LEVEL     set the debug level [$debuglevel]
  --disable-optimizations  disable compiler optimizations
  --enable-extra-warnings  enable more compiler warnings
  --disable-stripping      disable stripping of executables and shared libraries
  --assert-level=level     0(default), 1 or 2, amount of assertion testing,
                           2 causes a slowdown at runtime.
  --enable-memory-poisoning fill heap uninitialized allocated space with arbitrary data
  --valgrind=VALGRIND      run "make fate" tests through valgrind to detect memory
                           leaks and errors, using the specified valgrind binary.
                           Cannot be combined with --target-exec
  --enable-ftrapv          Trap arithmetic overflows
  --samples=PATH           location of test samples for FATE, if not set use
                           \$FATE_SAMPLES at make invocation time.
  --enable-neon-clobber-test check NEON registers for clobbering (should be
                           used only for debugging purposes)
  --enable-xmm-clobber-test check XMM registers for clobbering (Win64-only;
                           should be used only for debugging purposes)
  --enable-random          randomly enable/disable components
  --disable-random
  --enable-random=LIST     randomly enable/disable specific components or
  --disable-random=LIST    component groups. LIST is a comma-separated list
                           of NAME[:PROB] entries where NAME is a component
                           (group) and PROB the probability associated with
                           NAME (default 0.5).
  --random-seed=VALUE      seed value for --enable/disable-random
  --disable-valgrind-backtrace do not print a backtrace under Valgrind
                           (only applies to --disable-optimizations builds)
  --enable-ossfuzz         Enable building fuzzer tool
  --libfuzzer=PATH         path to libfuzzer
  --ignore-tests=TESTS     comma-separated list (without "fate-" prefix
                           in the name) of tests whose result is ignored
  --enable-linux-perf      enable Linux Performance Monitor API
  --enable-macos-kperf     enable macOS kperf (private) API
  --disable-large-tests    disable tests that use a large amount of memory
  --disable-ptx-compression don't compress CUDA PTX code even when possible

NOTE: Object files are built at the place where configure is launched.
EOF
  exit 0
}

if test -t 1 && which tput >/dev/null 2>&1; then
    ncolors=$(tput colors)
    if test -n "$ncolors" && test $ncolors -ge 8; then
        bold_color=$(tput bold)
        warn_color=$(tput setaf 3)
        error_color=$(tput setaf 1)
        reset_color=$(tput sgr0)
    fi
    # 72 used instead of 80 since that's the default of pr
    ncols=$(tput cols)
fi
: ${ncols:=72}

log(){
    echo "$@" >> $logfile
}

log_file(){
    log BEGIN "$1"
    log_file_i=1
    while IFS= read -r log_file_line; do
        printf '%5d\t%s\n' "$log_file_i" "$log_file_line"
        log_file_i=$(($log_file_i+1))
    done < "$1" >> "$logfile"
    log END "$1"
}

warn(){
    log "WARNING: $*"
    WARNINGS="${WARNINGS}WARNING: $*\n"
}

die(){
    log "$@"
    echo "$error_color$bold_color$@$reset_color"
    cat <<EOF

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.libera.chat.
EOF
    if disabled logging; then
        cat <<EOF
Rerun configure with logging enabled (do not use --disable-logging), and
include the log this produces with your report.
EOF
    else
        cat <<EOF
Include the log file "$logfile" produced by configure as this will help
solve the problem.
EOF
    fi
    exit 1
}

# Avoid locale weirdness, besides we really just want to translate ASCII.
toupper(){
    echo "$@" | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
}

tolower(){
    echo "$@" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz
}

c_escape(){
    echo "$*" | sed 's/["\\]/\\\0/g'
}

sh_quote(){
    v=$(echo "$1" | sed "s/'/'\\\\''/g")
    test "x$v" = "x${v#*[!A-Za-z0-9_/.+-]}" || v="'$v'"
    echo "$v"
}

cleanws(){
    echo "$@" | sed 's/^ *//;s/[[:space:]][[:space:]]*/ /g;s/ *$//'
}

filter(){
    pat=$1
    shift
    for v; do
        eval "case '$v' in $pat) printf '%s ' '$v' ;; esac"
    done
}

filter_out(){
    pat=$1
    shift
    for v; do
        eval "case '$v' in $pat) ;; *) printf '%s ' '$v' ;; esac"
    done
}

map(){
    m=$1
    shift
    for v; do eval $m; done
}

add_suffix(){
    suffix=$1
    shift
    for v; do echo ${v}${suffix}; done
}

remove_suffix(){
    suffix=$1
    shift
    for v; do echo ${v%$suffix}; done
}

set_all(){
    value=$1
    shift
    for var in $*; do
        eval $var=$value
    done
}

set_weak(){
    value=$1
    shift
    for var; do
        eval : \${$var:=$value}
    done
}

sanitize_var_name(){
    echo $@ | sed 's/[^A-Za-z0-9_]/_/g'
}

set_sanitized(){
    var=$1
    shift
    eval $(sanitize_var_name "$var")='$*'
}

get_sanitized(){
    eval echo \$$(sanitize_var_name "$1")
}

pushvar(){
    for pvar in $*; do
        eval level=\${${pvar}_level:=0}
        eval ${pvar}_${level}="\$$pvar"
        eval ${pvar}_level=$(($level+1))
    done
}

popvar(){
    for pvar in $*; do
        eval level=\${${pvar}_level:-0}
        test $level = 0 && continue
        eval level=$(($level-1))
        eval $pvar="\${${pvar}_${level}}"
        eval ${pvar}_level=$level
        eval unset ${pvar}_${level}
    done
}

request(){
    for var in $*; do
        eval ${var}_requested=yes
        eval $var=
    done
}

warn_if_gets_disabled(){
    for var in $*; do
        WARN_IF_GETS_DISABLED_LIST="$WARN_IF_GETS_DISABLED_LIST $var"
    done
}

enable(){
    set_all yes $*
}

disable(){
    set_all no $*
}

disable_with_reason(){
    disable $1
    eval "${1}_disable_reason=\"$2\""
    if requested $1; then
        die "ERROR: $1 requested, but $2"
    fi
}

enable_weak(){
    set_weak yes $*
}

disable_weak(){
    set_weak no $*
}

enable_sanitized(){
    for var; do
        enable $(sanitize_var_name $var)
    done
}

disable_sanitized(){
    for var; do
        disable $(sanitize_var_name $var)
    done
}

do_enable_deep(){
    for var; do
        enabled $var && continue
        set -- $var
        eval enable_deep \$${var}_select
        var=$1
        eval enable_deep_weak \$${var}_suggest
    done
}

enable_deep(){
    do_enable_deep $*
    enable $*
}

enable_deep_weak(){
    for var; do
        disabled $var && continue
        set -- $var
        do_enable_deep $var
        var=$1
        enable_weak $var
    done
}

requested(){
    test "${1#!}" = "$1" && op="=" || op="!="
    eval test "x\$${1#!}_requested" $op "xyes"
}

enabled(){
    test "${1#!}" = "$1" && op="=" || op="!="
    eval test "x\$${1#!}" $op "xyes"
}

disabled(){
    test "${1#!}" = "$1" && op="=" || op="!="
    eval test "x\$${1#!}" $op "xno"
}

enabled_all(){
    for opt; do
        enabled $opt || return 1
    done
}

disabled_all(){
    for opt; do
        disabled $opt || return 1
    done
}

enabled_any(){
    for opt; do
        enabled $opt && return 0
    done
}

disabled_any(){
    for opt; do
        disabled $opt && return 0
    done
    return 1
}

set_default(){
    for opt; do
        eval : \${$opt:=\$${opt}_default}
    done
}

is_in(){
    value=$1
    shift
    for var in $*; do
        [ $var = $value ] && return 0
    done
    return 1
}

# The cfg loop is very hot (several thousands iterations), and in bash also
# potentialy quite slow. Try to abort the iterations early, preferably without
# calling functions. 70%+ of the time cfg is already done or without deps.
check_deps(){
    for cfg; do
        eval [ x\$${cfg}_checking = xdone ] && continue
        eval [ x\$${cfg}_checking = xinprogress ] && die "Circular dependency for $cfg."

        eval "
        dep_all=\$${cfg}_deps
        dep_any=\$${cfg}_deps_any
        dep_con=\$${cfg}_conflict
        dep_sel=\$${cfg}_select
        dep_sgs=\$${cfg}_suggest
        dep_ifa=\$${cfg}_if
        dep_ifn=\$${cfg}_if_any
        "

        # most of the time here $cfg has no deps - avoid costly no-op work
        if [ "$dep_all$dep_any$dep_con$dep_sel$dep_sgs$dep_ifa$dep_ifn" ]; then
            eval ${cfg}_checking=inprogress

            set -- $cfg "$dep_all" "$dep_any" "$dep_con" "$dep_sel" "$dep_sgs" "$dep_ifa" "$dep_ifn"
            check_deps $dep_all $dep_any $dep_con $dep_sel $dep_sgs $dep_ifa $dep_ifn
            cfg=$1; dep_all=$2; dep_any=$3; dep_con=$4; dep_sel=$5 dep_sgs=$6; dep_ifa=$7; dep_ifn=$8

            [ -n "$dep_ifa" ] && { enabled_all $dep_ifa && enable_weak $cfg; }
            [ -n "$dep_ifn" ] && { enabled_any $dep_ifn && enable_weak $cfg; }
            enabled_all  $dep_all || { disable_with_reason $cfg "not all dependencies are satisfied: $dep_all"; }
            enabled_any  $dep_any || { disable_with_reason $cfg "not any dependency is satisfied: $dep_any"; }
            disabled_all $dep_con || { disable_with_reason $cfg "some conflicting dependencies are unsatisfied: $dep_con"; }
            disabled_any $dep_sel && { disable_with_reason $cfg "some selected dependency is unsatisfied: $dep_sel"; }

            enabled $cfg && enable_deep_weak $dep_sel $dep_sgs

            for dep in $dep_all $dep_any $dep_sel $dep_sgs; do
                # filter out library deps, these do not belong in extralibs
                is_in $dep $LIBRARY_LIST && continue
                enabled $dep && eval append ${cfg}_extralibs ${dep}_extralibs
            done
        fi

        eval ${cfg}_checking=done
    done
}

print_config(){
    pfx=$1
    files=$2
    shift 2
    map 'eval echo "$v \${$v:-no}"' "$@" |
    awk "BEGIN { split(\"$files\", files) }
        {
            c = \"$pfx\" toupper(\$1);
            v = \$2;
            sub(/yes/, 1, v);
            sub(/no/,  0, v);
            for (f in files) {
                file = files[f];
                if (file ~ /\\.h\$/) {
                    printf(\"#define %s %d\\n\", c, v) >>file;
                } else if (file ~ /\\.asm\$/) {
                    printf(\"%%define %s %d\\n\", c, v) >>file;
                } else if (file ~ /\\.mak\$/) {
                    n = -v ? \"\" : \"!\";
                    printf(\"%s%s=yes\\n\", n, c) >>file;
                } else if (file ~ /\\.texi\$/) {
                    pre = -v ? \"\" : \"@c \";
                    yesno = \$2;
                    c2 = tolower(c);
                    gsub(/_/, \"-\", c2);
                    printf(\"%s@set %s %s\\n\", pre, c2, yesno) >>file;
                }
            }
        }"
}

print_enabled(){
    suf=$1
    shift
    for v; do
        enabled $v && printf "%s\n" ${v%$suf}
    done
}

append(){
    var=$1
    shift
    eval "$var=\"\$$var $*\""
}

prepend(){
    var=$1
    shift
    eval "$var=\"$* \$$var\""
}

reverse () {
    eval '
        reverse_out=
        for v in $'$1'; do
            reverse_out="$v $reverse_out"
        done
        '$1'=$reverse_out
    '
}

# keeps the last occurence of each non-unique item
unique(){
    unique_out=
    eval unique_in=\$$1
    reverse unique_in
    for v in $unique_in; do
        # " $unique_out" +space such that every item is surrounded with spaces
        case " $unique_out" in *" $v "*) continue; esac  # already in list
        unique_out="$unique_out$v "
    done
    reverse unique_out
    eval $1=\$unique_out
}

resolve(){
    resolve_out=
    eval resolve_in=\$$1
    for v in $resolve_in; do
        eval 'resolve_out="$resolve_out$'$v' "'
    done
    eval $1=\$resolve_out
}

add_cppflags(){
    append CPPFLAGS "$@"
}

add_cflags(){
    append CFLAGS $($cflags_filter "$@")
}

add_cflags_headers(){
    append CFLAGS_HEADERS $($cflags_filter "$@")
}

add_cxxflags(){
    append CXXFLAGS $($cflags_filter "$@")
}

add_objcflags(){
    append OBJCFLAGS $($objcflags_filter "$@")
}

add_asflags(){
    append ASFLAGS $($asflags_filter "$@")
}

add_ldflags(){
    append LDFLAGS $($ldflags_filter "$@")
}

add_ldexeflags(){
    append LDEXEFLAGS $($ldflags_filter "$@")
}

add_ldsoflags(){
    append LDSOFLAGS $($ldflags_filter "$@")
}

add_extralibs(){
    prepend extralibs $($ldflags_filter "$@")
}

add_stripflags(){
    append ASMSTRIPFLAGS "$@"
}

add_host_cppflags(){
    append host_cppflags "$@"
}

add_host_cflags(){
    append host_cflags $($host_cflags_filter "$@")
}

add_host_ldflags(){
    append host_ldflags $($host_ldflags_filter "$@")
}

add_compat(){
    append compat_objs $1
    shift
    map 'add_cppflags -D$v' "$@"
}

test_cmd(){
    log "$@"
    "$@" >> $logfile 2>&1
}

test_stat(){
    log test_stat "$@"
    stat "$1" >> $logfile 2>&1
}

cc_e(){
    eval printf '%s\\n' $CC_E
}

cc_o(){
    eval printf '%s\\n' $CC_O
}

as_o(){
    eval printf '%s\\n' $AS_O
}

x86asm_o(){
    eval printf '%s\\n' $X86ASM_O
}

ld_o(){
    eval printf '%s\\n' $LD_O
}

hostcc_e(){
    eval printf '%s\\n' $HOSTCC_E
}

hostcc_o(){
    eval printf '%s\\n' $HOSTCC_O
}

nvcc_o(){
    eval printf '%s\\n' $NVCC_O
}

test_cc(){
    log test_cc "$@"
    cat > $TMPC
    log_file $TMPC
    test_cmd $cc $CPPFLAGS $CFLAGS "$@" $CC_C $(cc_o $TMPO) $TMPC
}

test_cxx(){
    log test_cxx "$@"
    cat > $TMPCPP
    log_file $TMPCPP
    test_cmd $cxx $CPPFLAGS $CFLAGS $CXXFLAGS "$@" $CXX_C -o $TMPO $TMPCPP
}

test_objcc(){
    log test_objcc "$@"
    cat > $TMPM
    log_file $TMPM
    test_cmd $objcc -Werror=missing-prototypes $CPPFLAGS $CFLAGS $OBJCFLAGS "$@" $OBJCC_C $(cc_o $TMPO) $TMPM
}

test_nvcc(){
    log test_nvcc "$@"
    cat > $TMPCU
    log_file $TMPCU
    tmpcu_=$TMPCU
    tmpo_=$TMPO
    [ -x "$(command -v cygpath)" ] && tmpcu_=$(cygpath -m $tmpcu_) && tmpo_=$(cygpath -m $tmpo_)
    test_cmd $nvcc $nvccflags "$@" $NVCC_C $(nvcc_o $tmpo_) $tmpcu_
}

check_nvcc() {
    log check_nvcc "$@"
    name=$1
    shift 1
    disabled $name && return
    disable $name
    test_nvcc "$@" <<EOF && enable $name
extern "C" {
    __global__ void hello(unsigned char *data) {}
}
EOF
}

test_cpp(){
    log test_cpp "$@"
    cat > $TMPC
    log_file $TMPC
    test_cmd $cc $CPPFLAGS $CFLAGS "$@" $(cc_e $TMPO) $TMPC
}

test_as(){
    log test_as "$@"
    cat > $TMPS
    log_file $TMPS
    test_cmd $as $CPPFLAGS $ASFLAGS "$@" $AS_C $(as_o $TMPO) $TMPS
}

test_x86asm(){
    log test_x86asm "$@"
    echo "$1" > $TMPASM
    log_file $TMPASM
    shift
    test_cmd $x86asmexe $X86ASMFLAGS -Werror "$@" $(x86asm_o $TMPO) $TMPASM
}

check_cmd(){
    log check_cmd "$@"
    cmd=$1
    disabled $cmd && return
    disable $cmd
    test_cmd $@ && enable $cmd
}

check_as(){
    log check_as "$@"
    name=$1
    code=$2
    shift 2
    disable $name
    test_as $@ <<EOF && enable $name
$code
EOF
}

check_inline_asm(){
    log check_inline_asm "$@"
    name="$1"
    code="$2"
    shift 2
    disable $name
    test_cc "$@" <<EOF && enable $name
void foo(void){ __asm__ volatile($code); }
EOF
}

check_inline_asm_flags(){
    log check_inline_asm_flags "$@"
    name="$1"
    code="$2"
    flags=''
    shift 2
    while [ "$1" != "" ]; do
      append flags $1
      shift
    done;
    disable $name
    cat > $TMPC <<EOF
void foo(void){ __asm__ volatile($code); }
EOF
    log_file $TMPC
    test_cmd $cc $CPPFLAGS $CFLAGS $flags "$@" $CC_C $(cc_o $TMPO) $TMPC &&
    enable $name && add_cflags $flags && add_asflags $flags && add_ldflags $flags
}

check_insn(){
    log check_insn "$@"
    check_inline_asm ${1}_inline "\"$2\""
    check_as ${1}_external "$2"
}

check_x86asm(){
    log check_x86asm "$@"
    name=$1
    shift
    disable $name
    test_x86asm "$@" && enable $name
}

test_ld(){
    log test_ld "$@"
    type=$1
    shift 1
    flags=$(filter_out '-l*|*.so' $@)
    libs=$(filter '-l*|*.so' $@)
    test_$type $($cflags_filter $flags) || return
    flags=$($ldflags_filter $flags)
    libs=$($ldflags_filter $libs)
    test_cmd $ld $LDFLAGS $LDEXEFLAGS $flags $(ld_o $TMPE) $TMPO $libs $extralibs
}

check_ld(){
    log check_ld "$@"
    type=$1
    name=$2
    shift 2
    disable $name
    test_ld $type $@ && enable $name
}

print_include(){
    hdr=$1
    test "${hdr%.h}" = "${hdr}" &&
        echo "#include $hdr"    ||
        echo "#include <$hdr>"
}

test_code(){
    log test_code "$@"
    check=$1
    headers=$2
    code=$3
    shift 3
    {
        for hdr in $headers; do
            print_include $hdr
        done
        echo "int main(void) { $code; return 0; }"
    } | test_$check "$@"
}

check_cppflags(){
    log check_cppflags "$@"
    test_cpp "$@" <<EOF && append CPPFLAGS "$@"
#include <stdlib.h>
EOF
}

test_cflags(){
    log test_cflags "$@"
    set -- $($cflags_filter "$@")
    test_cc "$@" <<EOF
int x;
EOF
}

check_cflags(){
    log check_cflags "$@"
    test_cflags "$@" && add_cflags "$@"
}

check_cxxflags(){
    log check_cxxflags "$@"
    set -- $($cflags_filter "$@")
    test_cxx "$@" <<EOF && append CXXFLAGS "$@"
int x;
EOF
}

test_objcflags(){
    log test_objcflags "$@"
    set -- $($objcflags_filter "$@")
    test_objcc "$@" <<EOF
int x;
EOF
}

check_objcflags(){
    log check_objcflags "$@"
    test_objcflags "$@" && add_objcflags "$@"
}

test_ldflags(){
    log test_ldflags "$@"
    set -- $($ldflags_filter "$@")
    test_ld "cc" "$@" <<EOF
int main(void){ return 0; }
EOF
}

check_ldflags(){
    log check_ldflags "$@"
    test_ldflags "$@" && add_ldflags "$@"
}

test_stripflags(){
    log test_stripflags "$@"
    # call test_cc to get a fresh TMPO
    test_cc <<EOF
int main(void) { return 0; }
EOF
    test_cmd $strip $ASMSTRIPFLAGS "$@" $TMPO
}

check_stripflags(){
    log check_stripflags "$@"
    test_stripflags "$@" && add_stripflags "$@"
}

check_headers(){
    log check_headers "$@"
    headers=$1
    shift
    disable_sanitized $headers
    {
        for hdr in $headers; do
            print_include $hdr
        done
        echo "int x;"
    } | test_cpp "$@" && enable_sanitized $headers
}

check_header_objcc(){
    log check_header_objcc "$@"
    rm -f -- "$TMPO"
    header=$1
    shift
    disable_sanitized $header
    {
       echo "#include <$header>"
       echo "int main(void) { return 0; }"
    } | test_objcc && test_stat "$TMPO" && enable_sanitized $header
}

check_apple_framework(){
    log check_apple_framework "$@"
    framework="$1"
    name="$(tolower $framework)"
    header="${framework}/${framework}.h"
    disable $name
    check_header_objcc $header &&
        enable $name && eval ${name}_extralibs='"-framework $framework"'
}

check_func(){
    log check_func "$@"
    func=$1
    shift
    disable $func
    test_ld "cc" "$@" <<EOF && enable $func
extern int $func();
int main(void){ $func(); }
EOF
}

check_complexfunc(){
    log check_complexfunc "$@"
    func=$1
    narg=$2
    shift 2
    test $narg = 2 && args="f, g" || args="f * I"
    disable $func
    test_ld "cc" "$@" <<EOF && enable $func
#include <complex.h>
#include <math.h>
float foo(complex float f, complex float g) { return $func($args); }
int main(void){ return (int) foo; }
EOF
}

check_mathfunc(){
    log check_mathfunc "$@"
    func=$1
    narg=$2
    shift 2
    test $narg = 2 && args="f, g" || args="f"
    disable $func
    test_ld "cc" "$@" <<EOF && enable $func
#include <math.h>
float foo(float f, float g) { return $func($args); }
int main(void){ return (int) foo; }
EOF
}

check_func_headers(){
    log check_func_headers "$@"
    headers=$1
    funcs=$2
    shift 2
    {
        for hdr in $headers; do
            print_include $hdr
        done
        echo "#include <stdint.h>"
        for func in $funcs; do
            echo "long check_$func(void) { return (long) $func; }"
        done
        echo "int main(void) { int ret = 0;"
        # LTO could optimize out the test functions without this
        for func in $funcs; do
            echo " ret |= ((intptr_t)check_$func) & 0xFFFF;"
        done
        echo "return ret; }"
    } | test_ld "cc" "$@" && enable $funcs && enable_sanitized $headers
}

check_class_headers_cpp(){
    log check_class_headers_cpp "$@"
    headers=$1
    classes=$2
    shift 2
    {
        for hdr in $headers; do
            echo "#include <$hdr>"
        done
        echo "int main(void) { "
        i=1
        for class in $classes; do
            echo "$class obj$i;"
            i=$(expr $i + 1)
        done
        echo "return 0; }"
    } | test_ld "cxx" "$@" && enable $funcs && enable_sanitized $headers
}

test_cpp_condition(){
    log test_cpp_condition "$@"
    header=$1
    condition=$2
    shift 2
    test_cpp "$@" <<EOF
#include <$header>
#if !($condition)
#error "unsatisfied condition: $condition"
#endif
EOF
}

check_cpp_condition(){
    log check_cpp_condition "$@"
    name=$1
    shift 1
    disable $name
    test_cpp_condition "$@" && enable $name
}

test_cflags_cc(){
    log test_cflags_cc "$@"
    flags=$1
    header=$2
    condition=$3
    shift 3
    set -- $($cflags_filter "$flags")
    test_cc "$@" <<EOF
#include <$header>
#if !($condition)
#error "unsatisfied condition: $condition"
#endif
EOF
}

check_lib(){
    log check_lib "$@"
    name="$1"
    headers="$2"
    funcs="$3"
    shift 3
    disable $name
    check_func_headers "$headers" "$funcs" "$@" &&
        enable $name && eval ${name}_extralibs="\$@"
}

check_lib_cpp(){
    log check_lib_cpp "$@"
    name="$1"
    headers="$2"
    classes="$3"
    shift 3
    disable $name
    check_class_headers_cpp "$headers" "$classes" "$@" &&
        enable $name && eval ${name}_extralibs="\$@"
}

test_pkg_config(){
    log test_pkg_config "$@"
    name="$1"
    pkg_version="$2"
    pkg="${2%% *}"
    headers="$3"
    funcs="$4"
    shift 4
    disable $name
    test_cmd $pkg_config --exists --print-errors $pkg_version || return
    pkg_cflags=$($pkg_config --cflags $pkg_config_flags $pkg)
    pkg_libs=$($pkg_config --libs $pkg_config_flags $pkg)
    pkg_incdir=$($pkg_config --variable=includedir $pkg_config_flags $pkg)
    check_func_headers "$headers" "$funcs" $pkg_cflags $pkg_libs "$@" &&
        enable $name &&
        set_sanitized "${name}_cflags"    $pkg_cflags &&
        set_sanitized "${name}_incdir"    $pkg_incdir &&
        set_sanitized "${name}_extralibs" $pkg_libs
}

test_pkg_config_cpp(){
    log test_pkg_config_cpp "$@"
    name="$1"
    pkg_version="$2"
    pkg="${2%% *}"
    headers="$3"
    cond="$4"
    shift 4
    disable $name
    test_cmd $pkg_config --exists --print-errors $pkg_version || return
    pkg_cflags=$($pkg_config --cflags $pkg_config_flags $pkg)
    pkg_incdir=$($pkg_config --variable=includedir $pkg_config_flags $pkg)
    pkg_incflags=$($pkg_config --cflags-only-I $pkg_config_flags $pkg)
    test_cpp_condition "$pkg_incdir/$headers" "$cond" "$@" &&
        enable $name &&
        set_sanitized "${name}_cflags" $pkg_cflags &&
        set_sanitized "${name}_incdir" $pkg_incdir &&
        set_sanitized "${name}_incflags" $pkg_incflags
}

check_pkg_config(){
    log check_pkg_config "$@"
    name="$1"
    test_pkg_config "$@" &&
        eval add_cflags \$${name}_cflags
}

check_pkg_config_cpp(){
    log check_pkg_config_cpp "$@"
    name="$1"
    test_pkg_config_cpp "$@" &&
        eval add_cflags \$${name}_cflags
}

check_pkg_config_header_only(){
    log check_pkg_config_cpp "$@"
    name="$1"
    test_pkg_config_cpp "$@" &&
        eval add_cflags \$${name}_incflags
}

test_exec(){
    test_ld "cc" "$@" && { enabled cross_compile || $TMPE >> $logfile 2>&1; }
}

check_exec_crash(){
    log check_exec_crash "$@"
    code=$(cat)

    # exit() is not async signal safe.  _Exit (C99) and _exit (POSIX)
    # are safe but may not be available everywhere.  Thus we use
    # raise(SIGTERM) instead.  The check is run in a subshell so we
    # can redirect the "Terminated" message from the shell.  SIGBUS
    # is not defined by standard C so it is used conditionally.

    (test_exec "$@") >> $logfile 2>&1 <<EOF
#include <signal.h>
static void sighandler(int sig){
    raise(SIGTERM);
}
int foo(void){
    $code
}
int (*func_ptr)(void) = foo;
int main(void){
    signal(SIGILL, sighandler);
    signal(SIGFPE, sighandler);
    signal(SIGSEGV, sighandler);
#ifdef SIGBUS
    signal(SIGBUS, sighandler);
#endif
    return func_ptr();
}
EOF
}

check_type(){
    log check_type "$@"
    headers=$1
    type=$2
    shift 2
    disable_sanitized "$type"
    test_code cc "$headers" "$type v" "$@" && enable_sanitized "$type"
}

check_struct(){
    log check_struct "$@"
    headers=$1
    struct=$2
    member=$3
    shift 3
    disable_sanitized "${struct}_${member}"
    test_code cc "$headers" "const void *p = &(($struct *)0)->$member" "$@" &&
        enable_sanitized "${struct}_${member}"
}

check_builtin(){
    log check_builtin "$@"
    name=$1
    headers=$2
    builtin=$3
    shift 3
    disable "$name"
    test_code ld "$headers" "$builtin" "cc" "$@" && enable "$name"
}

check_compile_assert(){
    log check_compile_assert "$@"
    name=$1
    headers=$2
    condition=$3
    shift 3
    disable "$name"
    test_code cc "$headers" "char c[2 * !!($condition) - 1]" "$@" && enable "$name"
}

check_cc(){
    log check_cc "$@"
    name=$1
    shift
    disable "$name"
    test_code cc "$@" && enable "$name"
}

require(){
    log require "$@"
    name_version="$1"
    name="${1%% *}"
    shift
    check_lib $name "$@" || die "ERROR: $name_version not found"
}

require_cc(){
    log require_cc "$@"
    name="$1"
    check_cc "$@" || die "ERROR: $name failed"
}

require_cpp(){
    log require_cpp "$@"
    name_version="$1"
    name="${1%% *}"
    shift
    check_lib_cpp "$name" "$@" || die "ERROR: $name_version not found"
}

require_headers(){
    log require_headers "$@"
    headers="$1"
    check_headers "$@" || die "ERROR: $headers not found"
}

require_cpp_condition(){
    log require_cpp_condition "$@"
    condition="$3"
    check_cpp_condition "$@" || die "ERROR: $condition not satisfied"
}

require_pkg_config(){
    log require_pkg_config "$@"
    pkg_version="$2"
    check_pkg_config "$@" || die "ERROR: $pkg_version not found using pkg-config$pkg_config_fail_message"
}

require_pkg_config_cpp(){
    log require_pkg_config_cpp "$@"
    pkg_version="$2"
    check_pkg_config_cpp "$@" || die "ERROR: $pkg_version not found using pkg-config$pkg_config_fail_message"
}

test_host_cc(){
    log test_host_cc "$@"
    cat > $TMPC
    log_file $TMPC
    test_cmd $host_cc $host_cflags "$@" $HOSTCC_C $(hostcc_o $TMPO) $TMPC
}

test_host_cpp(){
    log test_host_cpp "$@"
    cat > $TMPC
    log_file $TMPC
    test_cmd $host_cc $host_cppflags $host_cflags "$@" $(hostcc_e $TMPO) $TMPC
}

check_host_cppflags(){
    log check_host_cppflags "$@"
    test_host_cpp "$@" <<EOF && append host_cppflags "$@"
#include <stdlib.h>
EOF
}

check_host_cflags(){
    log check_host_cflags "$@"
    set -- $($host_cflags_filter "$@")
    test_host_cc "$@" <<EOF && append host_cflags "$@"
int x;
EOF
}

test_host_cpp_condition(){
    log test_host_cpp_condition "$@"
    header=$1
    condition=$2
    shift 2
    test_host_cpp "$@" <<EOF
#include <$header>
#if !($condition)
#error "unsatisfied condition: $condition"
#endif
EOF
}

check_host_cpp_condition(){
    log check_host_cpp_condition "$@"
    name=$1
    shift 1
    disable $name
    test_host_cpp_condition "$@" && enable $name
}

cp_if_changed(){
    cmp -s "$1" "$2" && { test "$quiet" != "yes" && echo "$2 is unchanged"; } && return
    mkdir -p "$(dirname $2)"
    cp -f "$1" "$2"
}

# CONFIG_LIST contains configurable options, while HAVE_LIST is for
# system-dependent things.

AVCODEC_COMPONENTS="
    bsfs
    decoders
    encoders
    hwaccels
    parsers
"

AVDEVICE_COMPONENTS="
    indevs
    outdevs
"

AVFILTER_COMPONENTS="
    filters
"

AVFORMAT_COMPONENTS="
    demuxers
    muxers
    protocols
"

COMPONENT_LIST="
    $AVCODEC_COMPONENTS
    $AVDEVICE_COMPONENTS
    $AVFILTER_COMPONENTS
    $AVFORMAT_COMPONENTS
"

EXAMPLE_LIST="
    avio_list_dir_example
    avio_reading_example
    decode_audio_example
    decode_video_example
    demuxing_decoding_example
    encode_audio_example
    encode_video_example
    extract_mvs_example
    filter_audio_example
    filtering_audio_example
    filtering_video_example
    http_multiclient_example
    hw_decode_example
    metadata_example
    muxing_example
    qsvdec_example
    remuxing_example
    resampling_audio_example
    scaling_video_example
    transcode_aac_example
    transcoding_example
    vaapi_encode_example
    vaapi_transcode_example
"

EXTERNAL_AUTODETECT_LIBRARY_LIST="
    alsa
    appkit
    avfoundation
    bzlib
    coreimage
    iconv
    libxcb
    libxcb_shm
    libxcb_shape
    libxcb_xfixes
    lzma
    mediafoundation
    metal
    schannel
    sdl2
    securetransport
    sndio
    xlib
    zlib
"

EXTERNAL_LIBRARY_GPL_LIST="
    avisynth
    frei0r
    libcdio
    libdavs2
    librubberband
    libvidstab
    libx264
    libx265
    libxavs
    libxavs2
    libxvid
"

EXTERNAL_LIBRARY_NONFREE_LIST="
    decklink
    libfdk_aac
    libtls
"

EXTERNAL_LIBRARY_VERSION3_LIST="
    gmp
    libaribb24
    liblensfun
    libopencore_amrnb
    libopencore_amrwb
    libvo_amrwbenc
    mbedtls
    rkmpp
"

EXTERNAL_LIBRARY_GPLV3_LIST="
    libsmbclient
"

EXTERNAL_LIBRARY_LIST="
    $EXTERNAL_LIBRARY_GPL_LIST
    $EXTERNAL_LIBRARY_NONFREE_LIST
    $EXTERNAL_LIBRARY_VERSION3_LIST
    $EXTERNAL_LIBRARY_GPLV3_LIST
    chromaprint
    gcrypt
    gnutls
    jni
    ladspa
    libaom
    libass
    libbluray
    libbs2b
    libcaca
    libcelt
    libcodec2
    libdav1d
    libdc1394
    libdrm
    libflite
    libfontconfig
    libfreetype
    libfribidi
    libglslang
    libgme
    libgsm
    libiec61883
    libilbc
    libjack
    libklvanc
    libkvazaar
    libmodplug
    libmp3lame
    libmysofa
    libopencv
    libopenh264
    libopenjpeg
    libopenmpt
    libopenvino
    libopus
    libplacebo
    libpulse
    librabbitmq
    librav1e
    librist
    librsvg
    librtmp
    libshaderc
    libshine
    libsmbclient
    libsnappy
    libsoxr
    libspeex
    libsrt
    libssh
    libsvtav1
    libtensorflow
    libtesseract
    libtheora
    libtwolame
    libuavs3d
    libv4l2
    libvmaf
    libvorbis
    libvpx
    libwebp
    libxml2
    libzimg
    libzmq
    libzvbi
    lv2
    mediacodec
    openal
    opengl
    openssl
    pocketsphinx
    vapoursynth
"

HWACCEL_AUTODETECT_LIBRARY_LIST="
    amf
    audiotoolbox
    crystalhd
    cuda
    cuda_llvm
    cuvid
    d3d11va
    dxva2
    ffnvcodec
    nvdec
    nvenc
    vaapi
    vdpau
    videotoolbox
    vulkan
    v4l2_m2m
    xvmc
"

# catchall list of things that require external libs to link
EXTRALIBS_LIST="
    cpu_init
    cws2fws
"

HWACCEL_LIBRARY_NONFREE_LIST="
    cuda_nvcc
    cuda_sdk
    libnpp
"

HWACCEL_LIBRARY_LIST="
    $HWACCEL_LIBRARY_NONFREE_LIST
    libmfx
    mmal
    omx
    opencl
"

DOCUMENT_LIST="
    doc
    htmlpages
    manpages
    podpages
    txtpages
"

FEATURE_LIST="
    ftrapv
    gray
    hardcoded_tables
    omx_rpi
    runtime_cpudetect
    safe_bitstream_reader
    shared
    small
    static
    swscale_alpha
"

# this list should be kept in linking order
LIBRARY_LIST="
    avdevice
    avfilter
    swscale
    postproc
    avformat
    avcodec
    swresample
    avutil
"

LICENSE_LIST="
    gpl
    nonfree
    version3
"

PROGRAM_LIST="
    ffplay
    ffprobe
    ffmpeg
"

SUBSYSTEM_LIST="
    dct
    dwt
    error_resilience
    faan
    fast_unaligned
    fft
    lsp
    lzo
    mdct
    pixelutils
    network
    rdft
"

# COMPONENT_LIST needs to come last to ensure correct dependency checking
CONFIG_LIST="
    $DOCUMENT_LIST
    $EXAMPLE_LIST
    $EXTERNAL_LIBRARY_LIST
    $EXTERNAL_AUTODETECT_LIBRARY_LIST
    $HWACCEL_LIBRARY_LIST
    $HWACCEL_AUTODETECT_LIBRARY_LIST
    $FEATURE_LIST
    $LICENSE_LIST
    $LIBRARY_LIST
    $PROGRAM_LIST
    $SUBSYSTEM_LIST
    autodetect
    fontconfig
    large_tests
    linux_perf
    macos_kperf
    memory_poisoning
    neon_clobber_test
    ossfuzz
    pic
    ptx_compression
    thumb
    valgrind_backtrace
    xmm_clobber_test
    $COMPONENT_LIST
"

THREADS_LIST="
    pthreads
    os2threads
    w32threads
"

ATOMICS_LIST="
    atomics_gcc
    atomics_suncc
    atomics_win32
"

AUTODETECT_LIBS="
    $EXTERNAL_AUTODETECT_LIBRARY_LIST
    $HWACCEL_AUTODETECT_LIBRARY_LIST
    $THREADS_LIST
"

ARCH_LIST="
    aarch64
    alpha
    arm
    avr32
    avr32_ap
    avr32_uc
    bfin
    ia64
    loongarch
    loongarch32
    loongarch64
    m68k
    mips
    mips64
    parisc
    ppc
    ppc64
    riscv
    s390
    sh4
    sparc
    sparc64
    tilegx
    tilepro
    tomi
    x86
    x86_32
    x86_64
"

ARCH_EXT_LIST_ARM="
    armv5te
    armv6
    armv6t2
    armv8
    neon
    vfp
    vfpv3
    setend
"

ARCH_EXT_LIST_MIPS="
    mipsfpu
    mips32r2
    mips32r5
    mips64r2
    mips32r6
    mips64r6
    mipsdsp
    mipsdspr2
    msa
"

ARCH_EXT_LIST_LOONGSON="
    loongson2
    loongson3
    mmi
    lsx
    lasx
"

ARCH_EXT_LIST_X86_SIMD="
    aesni
    amd3dnow
    amd3dnowext
    avx
    avx2
    avx512
    fma3
    fma4
    mmx
    mmxext
    sse
    sse2
    sse3
    sse4
    sse42
    ssse3
    xop
"

ARCH_EXT_LIST_PPC="
    altivec
    dcbzl
    ldbrx
    power8
    ppc4xx
    vsx
"

ARCH_EXT_LIST_X86="
    $ARCH_EXT_LIST_X86_SIMD
    cpunop
    i686
"

ARCH_EXT_LIST="
    $ARCH_EXT_LIST_ARM
    $ARCH_EXT_LIST_PPC
    $ARCH_EXT_LIST_X86
    $ARCH_EXT_LIST_MIPS
    $ARCH_EXT_LIST_LOONGSON
"

ARCH_FEATURES="
    aligned_stack
    fast_64bit
    fast_clz
    fast_cmov
    local_aligned
    simd_align_16
    simd_align_32
    simd_align_64
"

BUILTIN_LIST="
    atomic_cas_ptr
    machine_rw_barrier
    MemoryBarrier
    mm_empty
    rdtsc
    sem_timedwait
    sync_val_compare_and_swap
"
HAVE_LIST_CMDLINE="
    inline_asm
    symver
    x86asm
"

HAVE_LIST_PUB="
    bigendian
    fast_unaligned
"

HEADERS_LIST="
    arpa_inet_h
    asm_types_h
    cdio_paranoia_h
    cdio_paranoia_paranoia_h
    cuda_h
    dispatch_dispatch_h
    dev_bktr_ioctl_bt848_h
    dev_bktr_ioctl_meteor_h
    dev_ic_bt8xx_h
    dev_video_bktr_ioctl_bt848_h
    dev_video_meteor_ioctl_meteor_h
    direct_h
    dirent_h
    dxgidebug_h
    dxva_h
    ES2_gl_h
    gsm_h
    io_h
    linux_dma_buf_h
    linux_perf_event_h
    machine_ioctl_bt848_h
    machine_ioctl_meteor_h
    malloc_h
    opencv2_core_core_c_h
    OpenGL_gl3_h
    poll_h
    sys_param_h
    sys_resource_h
    sys_select_h
    sys_soundcard_h
    sys_time_h
    sys_un_h
    sys_videoio_h
    termios_h
    udplite_h
    unistd_h
    valgrind_valgrind_h
    windows_h
    winsock2_h
"

INTRINSICS_LIST="
    intrinsics_neon
"

COMPLEX_FUNCS="
    cabs
    cexp
"

MATH_FUNCS="
    atanf
    atan2f
    cbrt
    cbrtf
    copysign
    cosf
    erf
    exp2
    exp2f
    expf
    hypot
    isfinite
    isinf
    isnan
    ldexpf
    llrint
    llrintf
    log2
    log2f
    log10f
    lrint
    lrintf
    powf
    rint
    round
    roundf
    sinf
    trunc
    truncf
"

SYSTEM_FEATURES="
    dos_paths
    libc_msvcrt
    MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS
    section_data_rel_ro
    threads
    uwp
    winrt
"

SYSTEM_FUNCS="
    access
    aligned_malloc
    arc4random
    clock_gettime
    closesocket
    CommandLineToArgvW
    fcntl
    getaddrinfo
    gethrtime
    getopt
    GetModuleHandle
    GetProcessAffinityMask
    GetProcessMemoryInfo
    GetProcessTimes
    getrusage
    GetStdHandle
    GetSystemTimeAsFileTime
    gettimeofday
    glob
    glXGetProcAddress
    gmtime_r
    inet_aton
    isatty
    kbhit
    localtime_r
    lstat
    lzo1x_999_compress
    mach_absolute_time
    MapViewOfFile
    memalign
    mkstemp
    mmap
    mprotect
    nanosleep
    PeekNamedPipe
    posix_memalign
    pthread_cancel
    sched_getaffinity
    SecItemImport
    SetConsoleTextAttribute
    SetConsoleCtrlHandler
    SetDllDirectory
    setmode
    setrlimit
    Sleep
    strerror_r
    sysconf
    sysctl
    usleep
    UTGetOSTypeFromString
    VirtualAlloc
    wglGetProcAddress
"

SYSTEM_LIBRARIES="
    bcrypt
    vaapi_drm
    vaapi_x11
    vdpau_x11
"

TOOLCHAIN_FEATURES="
    as_arch_directive
    as_dn_directive
    as_fpu_directive
    as_func
    as_object_arch
    asm_mod_q
    blocks_extension
    ebp_available
    ebx_available
    gnu_as
    gnu_windres
    ibm_asm
    inline_asm_direct_symbol_refs
    inline_asm_labels
    inline_asm_nonlocal_labels
    pragma_deprecated
    rsync_contimeout
    symver_asm_label
    symver_gnu_asm
    vfp_args
    xform_asm
    xmm_clobbers
"

TYPES_LIST="
    kCMVideoCodecType_HEVC
    kCMVideoCodecType_HEVCWithAlpha
    kCMVideoCodecType_VP9
    kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange
    kCVPixelFormatType_422YpCbCr8BiPlanarVideoRange
    kCVPixelFormatType_422YpCbCr10BiPlanarVideoRange
    kCVPixelFormatType_422YpCbCr16BiPlanarVideoRange
    kCVPixelFormatType_444YpCbCr8BiPlanarVideoRange
    kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange
    kCVPixelFormatType_444YpCbCr16BiPlanarVideoRange
    kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ
    kCVImageBufferTransferFunction_ITU_R_2100_HLG
    kCVImageBufferTransferFunction_Linear
    kCVImageBufferYCbCrMatrix_ITU_R_2020
    kCVImageBufferColorPrimaries_ITU_R_2020
    kCVImageBufferTransferFunction_ITU_R_2020
    kCVImageBufferTransferFunction_SMPTE_ST_428_1
    socklen_t
    struct_addrinfo
    struct_group_source_req
    struct_ip_mreq_source
    struct_ipv6_mreq
    struct_msghdr_msg_flags
    struct_pollfd
    struct_rusage_ru_maxrss
    struct_sctp_event_subscribe
    struct_sockaddr_in6
    struct_sockaddr_sa_len
    struct_sockaddr_storage
    struct_stat_st_mtim_tv_nsec
    struct_v4l2_frmivalenum_discrete
"

HAVE_LIST="
    $ARCH_EXT_LIST
    $(add_suffix _external $ARCH_EXT_LIST)
    $(add_suffix _inline   $ARCH_EXT_LIST)
    $ARCH_FEATURES
    $BUILTIN_LIST
    $COMPLEX_FUNCS
    $HAVE_LIST_CMDLINE
    $HAVE_LIST_PUB
    $HEADERS_LIST
    $INTRINSICS_LIST
    $MATH_FUNCS
    $SYSTEM_FEATURES
    $SYSTEM_FUNCS
    $SYSTEM_LIBRARIES
    $THREADS_LIST
    $TOOLCHAIN_FEATURES
    $TYPES_LIST
    gzip
    libdrm_getfb2
    makeinfo
    makeinfo_html
    opencl_d3d11
    opencl_drm_arm
    opencl_drm_beignet
    opencl_dxva2
    opencl_vaapi_beignet
    opencl_vaapi_intel_media
    perl
    pod2man
    texi2html
    xmllint
    zlib_gzip
"

# options emitted with CONFIG_ prefix but not available on the command line
CONFIG_EXTRA="
    aandcttables
    ac3dsp
    adts_header
    atsc_a53
    audio_frame_queue
    audiodsp
    blockdsp
    bswapdsp
    cabac
    cbs
    cbs_av1
    cbs_h264
    cbs_h265
    cbs_jpeg
    cbs_mpeg2
    cbs_vp9
    dirac_parse
    dnn
    dovi_rpu
    dvprofile
    exif
    faandct
    faanidct
    fdctdsp
    flacdsp
    fmtconvert
    frame_thread_encoder
    g722dsp
    golomb
    gplv3
    h263dsp
    h264chroma
    h264dsp
    h264parse
    h264pred
    h264qpel
    hevcparse
    hpeldsp
    huffman
    huffyuvdsp
    huffyuvencdsp
    idctdsp
    iirfilter
    mdct15
    intrax8
    iso_media
    ividsp
    jpegtables
    lgplv3
    libx262
    llauddsp
    llviddsp
    llvidencdsp
    lpc
    lzf
    me_cmp
    mpeg_er
    mpegaudio
    mpegaudiodsp
    mpegaudioheader
    mpeg4audio
    mpegvideo
    mpegvideodec
    mpegvideoenc
    mss34dsp
    pixblockdsp
    qpeldsp
    qsv
    qsvdec
    qsvenc
    qsvvpp
    rangecoder
    riffdec
    riffenc
    rtpdec
    rtpenc_chain
    rv34dsp
    scene_sad
    sinewin
    snappy
    srtp
    startcode
    texturedsp
    texturedspenc
    tpeldsp
    vaapi_1
    vaapi_encode
    vc1dsp
    videodsp
    vp3dsp
    vp56dsp
    vp8dsp
    wma_freqs
    wmv2dsp
"

CMDLINE_SELECT="
    $ARCH_EXT_LIST
    $CONFIG_LIST
    $HAVE_LIST_CMDLINE
    $THREADS_LIST
    asm
    cross_compile
    debug
    extra_warnings
    logging
    lto
    optimizations
    rpath
    stripping
"

PATHS_LIST="
    bindir
    datadir
    docdir
    incdir
    libdir
    mandir
    pkgconfigdir
    prefix
    shlibdir
    install_name_dir
"

CMDLINE_SET="
    $PATHS_LIST
    ar
    arch
    as
    assert_level
    build_suffix
    cc
    objcc
    cpu
    cross_prefix
    custom_allocator
    cxx
    dep_cc
    doxygen
    env
    extra_version
    gas
    host_cc
    host_cflags
    host_extralibs
    host_ld
    host_ldflags
    host_os
    ignore_tests
    install
    ld
    ln_s
    logfile
    malloc_prefix
    metalcc
    metallib
    nm
    optflags
    nvcc
    nvccflags
    pkg_config
    pkg_config_flags
    progs_suffix
    random_seed
    ranlib
    samples
    strip
    sws_max_filter_size
    sysinclude
    sysroot
    target_exec
    target_os
    target_path
    target_samples
    tempprefix
    toolchain
    valgrind
    windres
    x86asmexe
"

CMDLINE_APPEND="
    extra_cflags
    extra_cxxflags
    extra_objcflags
    host_cppflags
"

# code dependency declarations

# architecture extensions

armv5te_deps="arm"
armv6_deps="arm"
armv6t2_deps="arm"
armv8_deps="aarch64"
neon_deps_any="aarch64 arm"
intrinsics_neon_deps="neon"
vfp_deps_any="aarch64 arm"
vfpv3_deps="vfp"
setend_deps="arm"

map 'eval ${v}_inline_deps=inline_asm' $ARCH_EXT_LIST_ARM

altivec_deps="ppc"
dcbzl_deps="ppc"
ldbrx_deps="ppc"
ppc4xx_deps="ppc"
vsx_deps="altivec"
power8_deps="vsx"

loongson2_deps="mips"
loongson3_deps="mips"
mmi_deps_any="loongson2 loongson3"
lsx_deps="loongarch"
lasx_deps="lsx"

mips32r2_deps="mips"
mips32r5_deps="mips"
mips32r6_deps="mips"
mips64r2_deps="mips"
mips64r6_deps="mips"
mipsfpu_deps="mips"
mipsdsp_deps="mips"
mipsdspr2_deps="mips"
msa_deps="mipsfpu"

cpunop_deps="i686"
x86_64_select="i686"
x86_64_suggest="fast_cmov"

amd3dnow_deps="mmx"
amd3dnowext_deps="amd3dnow"
i686_deps="x86"
mmx_deps="x86"
mmxext_deps="mmx"
sse_deps="mmxext"
sse2_deps="sse"
sse3_deps="sse2"
ssse3_deps="sse3"
sse4_deps="ssse3"
sse42_deps="sse4"
aesni_deps="sse42"
avx_deps="sse42"
xop_deps="avx"
fma3_deps="avx"
fma4_deps="avx"
avx2_deps="avx"
avx512_deps="avx2"

mmx_external_deps="x86asm"
mmx_inline_deps="inline_asm x86"
mmx_suggest="mmx_external mmx_inline"

for ext in $(filter_out mmx $ARCH_EXT_LIST_X86_SIMD); do
    eval dep=\$${ext}_deps
    eval ${ext}_external_deps='"${dep}_external"'
    eval ${ext}_inline_deps='"${dep}_inline"'
    eval ${ext}_suggest='"${ext}_external ${ext}_inline"'
done

aligned_stack_if_any="aarch64 ppc x86"
fast_64bit_if_any="aarch64 alpha ia64 mips64 parisc64 ppc64 riscv64 sparc64 x86_64"
fast_clz_if_any="aarch64 alpha avr32 mips ppc x86"
fast_unaligned_if_any="aarch64 ppc x86"
simd_align_16_if_any="altivec neon sse"
simd_align_32_if_any="avx"
simd_align_64_if_any="avx512"

# system capabilities
linux_perf_deps="linux_perf_event_h"
symver_if_any="symver_asm_label symver_gnu_asm"
valgrind_backtrace_conflict="optimizations"
valgrind_backtrace_deps="valgrind_valgrind_h"

# threading support
atomics_gcc_if="sync_val_compare_and_swap"
atomics_suncc_if="atomic_cas_ptr machine_rw_barrier"
atomics_win32_if="MemoryBarrier"
atomics_native_if_any="$ATOMICS_LIST"
w32threads_deps="atomics_native"
threads_if_any="$THREADS_LIST"

# subsystems
cbs_av1_select="cbs"
cbs_h264_select="cbs"
cbs_h265_select="cbs"
cbs_jpeg_select="cbs"
cbs_mpeg2_select="cbs"
cbs_vp9_select="cbs"
dct_select="rdft"
dirac_parse_select="golomb"
dovi_rpu_select="golomb"
dnn_suggest="libtensorflow libopenvino"
dnn_deps="avformat swscale"
error_resilience_select="me_cmp"
faandct_deps="faan"
faandct_select="fdctdsp"
faanidct_deps="faan"
faanidct_select="idctdsp"
h264dsp_select="startcode"
hevcparse_select="atsc_a53 golomb"
frame_thread_encoder_deps="encoders threads"
intrax8_select="blockdsp idctdsp"
iso_media_select="mpeg4audio"
mdct_select="fft"
mdct15_select="fft"
me_cmp_select="fdctdsp idctdsp pixblockdsp"
mpeg_er_select="error_resilience"
mpegaudio_select="mpegaudiodsp mpegaudioheader"
mpegaudiodsp_select="dct"
mpegvideo_select="blockdsp h264chroma hpeldsp idctdsp videodsp"
mpegvideodec_select="mpegvideo mpeg_er"
mpegvideoenc_select="aandcttables me_cmp mpegvideo pixblockdsp qpeldsp"
vc1dsp_select="h264chroma qpeldsp startcode"
rdft_select="fft"

# decoders / encoders
aac_decoder_select="adts_header mdct15 mdct mpeg4audio sinewin"
aac_fixed_decoder_select="adts_header mdct mpeg4audio"
aac_encoder_select="audio_frame_queue iirfilter lpc mdct sinewin"
aac_latm_decoder_select="aac_decoder aac_latm_parser"
ac3_decoder_select="ac3_parser ac3dsp bswapdsp fmtconvert mdct"
ac3_fixed_decoder_select="ac3_parser ac3dsp bswapdsp mdct"
ac3_encoder_select="ac3dsp audiodsp mdct me_cmp"
ac3_fixed_encoder_select="ac3dsp audiodsp mdct me_cmp"
acelp_kelvin_decoder_select="audiodsp"
adpcm_g722_decoder_select="g722dsp"
adpcm_g722_encoder_select="g722dsp"
aic_decoder_select="golomb idctdsp"
alac_encoder_select="lpc"
als_decoder_select="bswapdsp mpeg4audio"
amrnb_decoder_select="lsp"
amrwb_decoder_select="lsp"
amv_decoder_select="sp5x_decoder exif"
amv_encoder_select="jpegtables mpegvideoenc"
ape_decoder_select="bswapdsp llauddsp"
apng_decoder_deps="zlib"
apng_encoder_deps="zlib"
apng_encoder_select="llvidencdsp"
aptx_decoder_select="audio_frame_queue"
aptx_encoder_select="audio_frame_queue"
aptx_hd_decoder_select="audio_frame_queue"
aptx_hd_encoder_select="audio_frame_queue"
asv1_decoder_select="blockdsp bswapdsp idctdsp"
asv1_encoder_select="aandcttables bswapdsp fdctdsp pixblockdsp"
asv2_decoder_select="blockdsp bswapdsp idctdsp"
asv2_encoder_select="aandcttables bswapdsp fdctdsp pixblockdsp"
atrac1_decoder_select="mdct sinewin"
atrac3_decoder_select="mdct"
atrac3al_decoder_select="mdct"
atrac3p_decoder_select="mdct sinewin"
atrac3pal_decoder_select="mdct sinewin"
atrac9_decoder_select="mdct"
av1_decoder_select="cbs_av1"
bink_decoder_select="blockdsp hpeldsp"
binkaudio_dct_decoder_select="mdct rdft dct sinewin wma_freqs"
binkaudio_rdft_decoder_select="mdct rdft sinewin wma_freqs"
cavs_decoder_select="blockdsp golomb h264chroma idctdsp qpeldsp videodsp"
clearvideo_decoder_select="idctdsp"
cllc_decoder_select="bswapdsp"
comfortnoise_encoder_select="lpc"
cook_decoder_select="audiodsp mdct sinewin"
cscd_decoder_select="lzo"
cscd_decoder_suggest="zlib"
dca_decoder_select="mdct"
dca_encoder_select="mdct"
dds_decoder_select="texturedsp"
dirac_decoder_select="dirac_parse dwt golomb videodsp mpegvideoenc"
dnxhd_decoder_select="blockdsp idctdsp"
dnxhd_encoder_select="blockdsp fdctdsp idctdsp mpegvideoenc pixblockdsp"
dolby_e_decoder_select="mdct"
dvvideo_decoder_select="dvprofile idctdsp"
dvvideo_encoder_select="dvprofile fdctdsp me_cmp pixblockdsp"
dxa_decoder_deps="zlib"
dxv_decoder_select="lzf texturedsp"
eac3_decoder_select="ac3_decoder"
eac3_encoder_select="ac3_encoder"
eamad_decoder_select="aandcttables blockdsp bswapdsp idctdsp mpegvideo"
eatgq_decoder_select="aandcttables"
eatqi_decoder_select="aandcttables blockdsp bswapdsp idctdsp"
exr_decoder_deps="zlib"
exr_encoder_deps="zlib"
ffv1_decoder_select="rangecoder"
ffv1_encoder_select="rangecoder"
ffvhuff_decoder_select="huffyuv_decoder"
ffvhuff_encoder_select="huffyuv_encoder"
fic_decoder_select="golomb"
flac_decoder_select="flacdsp"
flac_encoder_select="bswapdsp flacdsp lpc"
flashsv2_decoder_deps="zlib"
flashsv2_encoder_deps="zlib"
flashsv_decoder_deps="zlib"
flashsv_encoder_deps="zlib"
flv_decoder_select="h263_decoder"
flv_encoder_select="h263_encoder"
fourxm_decoder_select="blockdsp bswapdsp"
fraps_decoder_select="bswapdsp huffman"
g2m_decoder_deps="zlib"
g2m_decoder_select="blockdsp idctdsp jpegtables"
g729_decoder_select="audiodsp"
h261_decoder_select="mpegvideodec"
h261_encoder_select="mpegvideoenc"
h263_decoder_select="h263_parser h263dsp mpegvideodec qpeldsp"
h263_encoder_select="h263dsp mpegvideoenc"
h263i_decoder_select="h263_decoder"
h263p_decoder_select="h263_decoder"
h263p_encoder_select="h263_encoder"
h264_decoder_select="atsc_a53 cabac golomb h264chroma h264dsp h264parse h264pred h264qpel videodsp"
h264_decoder_suggest="error_resilience"
hap_decoder_select="snappy texturedsp"
hap_encoder_deps="libsnappy"
hap_encoder_select="texturedspenc"
hevc_decoder_select="atsc_a53 bswapdsp cabac dovi_rpu golomb hevcparse videodsp"
huffyuv_decoder_select="bswapdsp huffyuvdsp llviddsp"
huffyuv_encoder_select="bswapdsp huffman huffyuvencdsp llvidencdsp"
hymt_decoder_select="huffyuv_decoder"
iac_decoder_select="imc_decoder"
imc_decoder_select="bswapdsp fft mdct sinewin"
imm4_decoder_select="bswapdsp"
imm5_decoder_select="h264_decoder hevc_decoder"
indeo3_decoder_select="hpeldsp"
indeo4_decoder_select="ividsp"
indeo5_decoder_select="ividsp"
interplay_video_decoder_select="hpeldsp"
ipu_decoder_select="mpegvideodec"
jpegls_decoder_select="mjpeg_decoder"
jv_decoder_select="blockdsp"
lagarith_decoder_select="llviddsp"
ljpeg_encoder_select="idctdsp jpegtables"
lscr_decoder_deps="zlib"
magicyuv_decoder_select="llviddsp"
magicyuv_encoder_select="llvidencdsp"
mdec_decoder_select="blockdsp bswapdsp idctdsp mpegvideo"
metasound_decoder_select="lsp mdct sinewin"
mimic_decoder_select="blockdsp bswapdsp hpeldsp idctdsp"
mjpeg_decoder_select="blockdsp hpeldsp exif idctdsp jpegtables"
mjpeg_encoder_select="jpegtables mpegvideoenc"
mjpegb_decoder_select="mjpeg_decoder"
mlp_decoder_select="mlp_parser"
mlp_encoder_select="lpc audio_frame_queue"
mobiclip_decoder_select="bswapdsp golomb"
motionpixels_decoder_select="bswapdsp"
mp1_decoder_select="mpegaudio"
mp1float_decoder_select="mpegaudio"
mp2_decoder_select="mpegaudio"
mp2float_decoder_select="mpegaudio"
mp3_decoder_select="mpegaudio"
mp3adu_decoder_select="mpegaudio"
mp3adufloat_decoder_select="mpegaudio"
mp3float_decoder_select="mpegaudio"
mp3on4_decoder_select="mpegaudio mpeg4audio"
mp3on4float_decoder_select="mpegaudio mpeg4audio"
mpc7_decoder_select="bswapdsp mpegaudiodsp"
mpc8_decoder_select="mpegaudiodsp"
mpegvideo_decoder_select="mpegvideodec"
mpeg1video_decoder_select="mpegvideodec"
mpeg1video_encoder_select="mpegvideoenc h263dsp"
mpeg2video_decoder_select="mpegvideodec"
mpeg2video_encoder_select="mpegvideoenc h263dsp"
mpeg4_decoder_select="h263_decoder mpeg4video_parser"
mpeg4_encoder_select="h263_encoder"
msa1_decoder_select="mss34dsp"
mscc_decoder_deps="zlib"
msmpeg4v1_decoder_select="h263_decoder"
msmpeg4v2_decoder_select="h263_decoder"
msmpeg4v2_encoder_select="h263_encoder"
msmpeg4v3_decoder_select="h263_decoder"
msmpeg4v3_encoder_select="h263_encoder"
mss2_decoder_select="mpegvideodec qpeldsp vc1_decoder"
mts2_decoder_select="jpegtables mss34dsp"
mv30_decoder_select="aandcttables blockdsp"
mvha_decoder_deps="zlib"
mvha_decoder_select="llviddsp"
mwsc_decoder_deps="zlib"
mxpeg_decoder_select="mjpeg_decoder"
nellymoser_decoder_select="mdct sinewin"
nellymoser_encoder_select="audio_frame_queue mdct sinewin"
notchlc_decoder_select="lzf"
nuv_decoder_select="idctdsp lzo"
on2avc_decoder_select="mdct"
opus_decoder_deps="swresample"
opus_decoder_select="mdct15"
opus_encoder_select="audio_frame_queue mdct15"
png_decoder_deps="zlib"
png_encoder_deps="zlib"
png_encoder_select="llvidencdsp"
prores_decoder_select="blockdsp idctdsp"
prores_encoder_select="fdctdsp"
qcelp_decoder_select="lsp"
qdm2_decoder_select="mdct rdft mpegaudiodsp"
ra_144_decoder_select="audiodsp"
ra_144_encoder_select="audio_frame_queue lpc audiodsp"
ralf_decoder_select="golomb"
rasc_decoder_deps="zlib"
rawvideo_decoder_select="bswapdsp"
rscc_decoder_deps="zlib"
rtjpeg_decoder_select="me_cmp"
rv10_decoder_select="h263_decoder"
rv10_encoder_select="h263_encoder"
rv20_decoder_select="h263_decoder"
rv20_encoder_select="h263_encoder"
rv30_decoder_select="golomb h264pred h264qpel mpegvideodec rv34dsp"
rv40_decoder_select="golomb h264pred h264qpel mpegvideodec rv34dsp"
screenpresso_decoder_deps="zlib"
shorten_decoder_select="bswapdsp"
sipr_decoder_select="lsp"
smvjpeg_decoder_select="mjpeg_decoder"
snow_decoder_select="dwt h264qpel hpeldsp me_cmp rangecoder videodsp"
snow_encoder_select="dwt h264qpel hpeldsp me_cmp mpegvideoenc rangecoder"
sonic_decoder_select="golomb rangecoder"
sonic_encoder_select="golomb rangecoder"
sonic_ls_encoder_select="golomb rangecoder"
sp5x_decoder_select="mjpeg_decoder"
speedhq_decoder_select="mpegvideo"
speedhq_encoder_select="mpegvideoenc"
srgc_decoder_deps="zlib"
svq1_decoder_select="hpeldsp"
svq1_encoder_select="hpeldsp me_cmp mpegvideoenc"
svq3_decoder_select="golomb h264dsp h264parse h264pred hpeldsp tpeldsp videodsp"
svq3_decoder_suggest="zlib"
tak_decoder_select="audiodsp"
tdsc_decoder_deps="zlib"
tdsc_decoder_select="mjpeg_decoder"
theora_decoder_select="vp3_decoder"
thp_decoder_select="mjpeg_decoder"
tiff_decoder_select="mjpeg_decoder"
tiff_decoder_suggest="zlib lzma"
tiff_encoder_suggest="zlib"
truehd_decoder_select="mlp_parser"
truehd_encoder_select="lpc audio_frame_queue"
truemotion2_decoder_select="bswapdsp"
truespeech_decoder_select="bswapdsp"
tscc_decoder_deps="zlib"
twinvq_decoder_select="mdct lsp sinewin"
txd_decoder_select="texturedsp"
utvideo_decoder_select="bswapdsp llviddsp"
utvideo_encoder_select="bswapdsp huffman llvidencdsp"
vble_decoder_select="llviddsp"
vc1_decoder_select="blockdsp h263_decoder h264qpel intrax8 mpegvideodec vc1dsp"
vc1image_decoder_select="vc1_decoder"
vorbis_decoder_select="mdct"
vorbis_encoder_select="audio_frame_queue mdct"
vp3_decoder_select="hpeldsp vp3dsp videodsp"
vp4_decoder_select="vp3_decoder"
vp5_decoder_select="h264chroma hpeldsp videodsp vp3dsp vp56dsp"
vp6_decoder_select="h264chroma hpeldsp huffman videodsp vp3dsp vp56dsp"
vp6a_decoder_select="vp6_decoder"
vp6f_decoder_select="vp6_decoder"
vp7_decoder_select="h264pred videodsp vp8dsp"
vp8_decoder_select="h264pred videodsp vp8dsp"
vp9_decoder_select="videodsp vp9_parser vp9_superframe_split_bsf"
wcmv_decoder_deps="zlib"
webp_decoder_select="vp8_decoder exif"
wmalossless_decoder_select="llauddsp"
wmapro_decoder_select="mdct sinewin wma_freqs"
wmav1_decoder_select="mdct sinewin wma_freqs"
wmav1_encoder_select="mdct sinewin wma_freqs"
wmav2_decoder_select="mdct sinewin wma_freqs"
wmav2_encoder_select="mdct sinewin wma_freqs"
wmavoice_decoder_select="lsp rdft dct mdct sinewin"
wmv1_decoder_select="h263_decoder"
wmv1_encoder_select="h263_encoder"
wmv2_decoder_select="blockdsp error_resilience h263_decoder idctdsp intrax8 videodsp wmv2dsp"
wmv2_encoder_select="h263_encoder wmv2dsp"
wmv3_decoder_select="vc1_decoder"
wmv3image_decoder_select="wmv3_decoder"
xma1_decoder_select="wmapro_decoder"
xma2_decoder_select="wmapro_decoder"
ylc_decoder_select="bswapdsp"
zerocodec_decoder_deps="zlib"
zlib_decoder_deps="zlib"
zlib_encoder_deps="zlib"
zmbv_decoder_deps="zlib"
zmbv_encoder_deps="zlib"

# hardware accelerators
crystalhd_deps="libcrystalhd_libcrystalhd_if_h"
cuda_deps="ffnvcodec"
cuvid_deps="ffnvcodec"
d3d11va_deps="dxva_h ID3D11VideoDecoder ID3D11VideoContext"
dxva2_deps="dxva2api_h DXVA2_ConfigPictureDecode ole32 user32"
ffnvcodec_deps_any="libdl LoadLibrary"
nvdec_deps="ffnvcodec"
vaapi_x11_deps="xlib_x11"
videotoolbox_hwaccel_deps="videotoolbox pthreads"
videotoolbox_hwaccel_extralibs="-framework QuartzCore"
vulkan_deps_any="libdl LoadLibrary"
xvmc_deps="X11_extensions_XvMClib_h"

av1_d3d11va_hwaccel_deps="d3d11va DXVA_PicParams_AV1"
av1_d3d11va_hwaccel_select="av1_decoder"
av1_d3d11va2_hwaccel_deps="d3d11va DXVA_PicParams_AV1"
av1_d3d11va2_hwaccel_select="av1_decoder"
av1_dxva2_hwaccel_deps="dxva2 DXVA_PicParams_AV1"
av1_dxva2_hwaccel_select="av1_decoder"
av1_nvdec_hwaccel_deps="nvdec CUVIDAV1PICPARAMS"
av1_nvdec_hwaccel_select="av1_decoder"
av1_vaapi_hwaccel_deps="vaapi VADecPictureParameterBufferAV1_bit_depth_idx"
av1_vaapi_hwaccel_select="av1_decoder"
h263_vaapi_hwaccel_deps="vaapi"
h263_vaapi_hwaccel_select="h263_decoder"
h263_videotoolbox_hwaccel_deps="videotoolbox"
h263_videotoolbox_hwaccel_select="h263_decoder"
h264_d3d11va_hwaccel_deps="d3d11va"
h264_d3d11va_hwaccel_select="h264_decoder"
h264_d3d11va2_hwaccel_deps="d3d11va"
h264_d3d11va2_hwaccel_select="h264_decoder"
h264_dxva2_hwaccel_deps="dxva2"
h264_dxva2_hwaccel_select="h264_decoder"
h264_nvdec_hwaccel_deps="nvdec"
h264_nvdec_hwaccel_select="h264_decoder"
h264_vaapi_hwaccel_deps="vaapi"
h264_vaapi_hwaccel_select="h264_decoder"
h264_vdpau_hwaccel_deps="vdpau"
h264_vdpau_hwaccel_select="h264_decoder"
h264_videotoolbox_hwaccel_deps="videotoolbox"
h264_videotoolbox_hwaccel_select="h264_decoder"
hevc_d3d11va_hwaccel_deps="d3d11va DXVA_PicParams_HEVC"
hevc_d3d11va_hwaccel_select="hevc_decoder"
hevc_d3d11va2_hwaccel_deps="d3d11va DXVA_PicParams_HEVC"
hevc_d3d11va2_hwaccel_select="hevc_decoder"
hevc_dxva2_hwaccel_deps="dxva2 DXVA_PicParams_HEVC"
hevc_dxva2_hwaccel_select="hevc_decoder"
hevc_nvdec_hwaccel_deps="nvdec"
hevc_nvdec_hwaccel_select="hevc_decoder"
hevc_vaapi_hwaccel_deps="vaapi VAPictureParameterBufferHEVC"
hevc_vaapi_hwaccel_select="hevc_decoder"
hevc_vdpau_hwaccel_deps="vdpau VdpPictureInfoHEVC"
hevc_vdpau_hwaccel_select="hevc_decoder"
hevc_videotoolbox_hwaccel_deps="videotoolbox"
hevc_videotoolbox_hwaccel_select="hevc_decoder"
mjpeg_nvdec_hwaccel_deps="nvdec"
mjpeg_nvdec_hwaccel_select="mjpeg_decoder"
mjpeg_vaapi_hwaccel_deps="vaapi"
mjpeg_vaapi_hwaccel_select="mjpeg_decoder"
mpeg_xvmc_hwaccel_deps="xvmc"
mpeg_xvmc_hwaccel_select="mpeg2video_decoder"
mpeg1_nvdec_hwaccel_deps="nvdec"
mpeg1_nvdec_hwaccel_select="mpeg1video_decoder"
mpeg1_vdpau_hwaccel_deps="vdpau"
mpeg1_vdpau_hwaccel_select="mpeg1video_decoder"
mpeg1_videotoolbox_hwaccel_deps="videotoolbox"
mpeg1_videotoolbox_hwaccel_select="mpeg1video_decoder"
mpeg1_xvmc_hwaccel_deps="xvmc"
mpeg1_xvmc_hwaccel_select="mpeg1video_decoder"
mpeg2_d3d11va_hwaccel_deps="d3d11va"
mpeg2_d3d11va_hwaccel_select="mpeg2video_decoder"
mpeg2_d3d11va2_hwaccel_deps="d3d11va"
mpeg2_d3d11va2_hwaccel_select="mpeg2video_decoder"
mpeg2_dxva2_hwaccel_deps="dxva2"
mpeg2_dxva2_hwaccel_select="mpeg2video_decoder"
mpeg2_nvdec_hwaccel_deps="nvdec"
mpeg2_nvdec_hwaccel_select="mpeg2video_decoder"
mpeg2_vaapi_hwaccel_deps="vaapi"
mpeg2_vaapi_hwaccel_select="mpeg2video_decoder"
mpeg2_vdpau_hwaccel_deps="vdpau"
mpeg2_vdpau_hwaccel_select="mpeg2video_decoder"
mpeg2_videotoolbox_hwaccel_deps="videotoolbox"
mpeg2_videotoolbox_hwaccel_select="mpeg2video_decoder"
mpeg2_xvmc_hwaccel_deps="xvmc"
mpeg2_xvmc_hwaccel_select="mpeg2video_decoder"
mpeg4_nvdec_hwaccel_deps="nvdec"
mpeg4_nvdec_hwaccel_select="mpeg4_decoder"
mpeg4_vaapi_hwaccel_deps="vaapi"
mpeg4_vaapi_hwaccel_select="mpeg4_decoder"
mpeg4_vdpau_hwaccel_deps="vdpau"
mpeg4_vdpau_hwaccel_select="mpeg4_decoder"
mpeg4_videotoolbox_hwaccel_deps="videotoolbox"
mpeg4_videotoolbox_hwaccel_select="mpeg4_decoder"
prores_videotoolbox_hwaccel_deps="videotoolbox"
prores_videotoolbox_hwaccel_select="prores_decoder"
vc1_d3d11va_hwaccel_deps="d3d11va"
vc1_d3d11va_hwaccel_select="vc1_decoder"
vc1_d3d11va2_hwaccel_deps="d3d11va"
vc1_d3d11va2_hwaccel_select="vc1_decoder"
vc1_dxva2_hwaccel_deps="dxva2"
vc1_dxva2_hwaccel_select="vc1_decoder"
vc1_nvdec_hwaccel_deps="nvdec"
vc1_nvdec_hwaccel_select="vc1_decoder"
vc1_vaapi_hwaccel_deps="vaapi"
vc1_vaapi_hwaccel_select="vc1_decoder"
vc1_vdpau_hwaccel_deps="vdpau"
vc1_vdpau_hwaccel_select="vc1_decoder"
vp8_nvdec_hwaccel_deps="nvdec"
vp8_nvdec_hwaccel_select="vp8_decoder"
vp8_vaapi_hwaccel_deps="vaapi"
vp8_vaapi_hwaccel_select="vp8_decoder"
vp9_d3d11va_hwaccel_deps="d3d11va DXVA_PicParams_VP9"
vp9_d3d11va_hwaccel_select="vp9_decoder"
vp9_d3d11va2_hwaccel_deps="d3d11va DXVA_PicParams_VP9"
vp9_d3d11va2_hwaccel_select="vp9_decoder"
vp9_dxva2_hwaccel_deps="dxva2 DXVA_PicParams_VP9"
vp9_dxva2_hwaccel_select="vp9_decoder"
vp9_nvdec_hwaccel_deps="nvdec"
vp9_nvdec_hwaccel_select="vp9_decoder"
vp9_vaapi_hwaccel_deps="vaapi VADecPictureParameterBufferVP9_bit_depth"
vp9_vaapi_hwaccel_select="vp9_decoder"
vp9_vdpau_hwaccel_deps="vdpau VdpPictureInfoVP9"
vp9_vdpau_hwaccel_select="vp9_decoder"
vp9_videotoolbox_hwaccel_deps="videotoolbox"
vp9_videotoolbox_hwaccel_select="vp9_decoder"
wmv3_d3d11va_hwaccel_select="vc1_d3d11va_hwaccel"
wmv3_d3d11va2_hwaccel_select="vc1_d3d11va2_hwaccel"
wmv3_dxva2_hwaccel_select="vc1_dxva2_hwaccel"
wmv3_nvdec_hwaccel_select="vc1_nvdec_hwaccel"
wmv3_vaapi_hwaccel_select="vc1_vaapi_hwaccel"
wmv3_vdpau_hwaccel_select="vc1_vdpau_hwaccel"

# hardware-accelerated codecs
mediafoundation_deps="mftransform_h MFCreateAlignedMemoryBuffer"
mediafoundation_extralibs="-lmfplat -lmfuuid -lole32 -lstrmiids"
omx_deps="libdl pthreads"
omx_rpi_select="omx"
qsv_deps="libmfx"
qsvdec_select="qsv"
qsvenc_select="qsv"
qsvvpp_select="qsv"
vaapi_encode_deps="vaapi"
v4l2_m2m_deps="linux_videodev2_h sem_timedwait"

hwupload_cuda_filter_deps="ffnvcodec"
scale_npp_filter_deps="ffnvcodec libnpp"
scale2ref_npp_filter_deps="ffnvcodec libnpp"
scale_cuda_filter_deps="ffnvcodec"
scale_cuda_filter_deps_any="cuda_nvcc cuda_llvm"
thumbnail_cuda_filter_deps="ffnvcodec"
thumbnail_cuda_filter_deps_any="cuda_nvcc cuda_llvm"
transpose_npp_filter_deps="ffnvcodec libnpp"
overlay_cuda_filter_deps="ffnvcodec"
overlay_cuda_filter_deps_any="cuda_nvcc cuda_llvm"
sharpen_npp_filter_deps="ffnvcodec libnpp"

amf_deps_any="libdl LoadLibrary"
nvenc_deps="ffnvcodec"
nvenc_deps_any="libdl LoadLibrary"

aac_mf_encoder_deps="mediafoundation"
ac3_mf_encoder_deps="mediafoundation"
av1_cuvid_decoder_deps="cuvid CUVIDAV1PICPARAMS"
h263_v4l2m2m_decoder_deps="v4l2_m2m h263_v4l2_m2m"
h263_v4l2m2m_encoder_deps="v4l2_m2m h263_v4l2_m2m"
h264_amf_encoder_deps="amf"
h264_crystalhd_decoder_select="crystalhd h264_mp4toannexb_bsf h264_parser"
h264_cuvid_decoder_deps="cuvid"
h264_cuvid_decoder_select="h264_mp4toannexb_bsf"
h264_mediacodec_decoder_deps="mediacodec"
h264_mediacodec_decoder_select="h264_mp4toannexb_bsf h264_parser"
h264_mf_encoder_deps="mediafoundation"
h264_mmal_decoder_deps="mmal"
h264_nvenc_encoder_deps="nvenc"
h264_nvenc_encoder_select="atsc_a53"
h264_omx_encoder_deps="omx"
h264_qsv_decoder_select="h264_mp4toannexb_bsf qsvdec"
h264_qsv_encoder_select="atsc_a53 qsvenc"
h264_rkmpp_decoder_deps="rkmpp"
h264_rkmpp_decoder_select="h264_mp4toannexb_bsf"
h264_vaapi_encoder_select="cbs_h264 vaapi_encode"
h264_v4l2m2m_decoder_deps="v4l2_m2m h264_v4l2_m2m"
h264_v4l2m2m_decoder_select="h264_mp4toannexb_bsf"
h264_v4l2m2m_encoder_deps="v4l2_m2m h264_v4l2_m2m"
hevc_amf_encoder_deps="amf"
hevc_cuvid_decoder_deps="cuvid"
hevc_cuvid_decoder_select="hevc_mp4toannexb_bsf"
hevc_mediacodec_decoder_deps="mediacodec"
hevc_mediacodec_decoder_select="hevc_mp4toannexb_bsf hevc_parser"
hevc_mf_encoder_deps="mediafoundation"
hevc_nvenc_encoder_deps="nvenc"
hevc_nvenc_encoder_select="atsc_a53"
hevc_qsv_decoder_select="hevc_mp4toannexb_bsf qsvdec"
hevc_qsv_encoder_select="hevcparse qsvenc"
hevc_rkmpp_decoder_deps="rkmpp"
hevc_rkmpp_decoder_select="hevc_mp4toannexb_bsf"
hevc_vaapi_encoder_deps="VAEncPictureParameterBufferHEVC"
hevc_vaapi_encoder_select="cbs_h265 vaapi_encode"
hevc_v4l2m2m_decoder_deps="v4l2_m2m hevc_v4l2_m2m"
hevc_v4l2m2m_decoder_select="hevc_mp4toannexb_bsf"
hevc_v4l2m2m_encoder_deps="v4l2_m2m hevc_v4l2_m2m"
mjpeg_cuvid_decoder_deps="cuvid"
mjpeg_qsv_decoder_select="qsvdec"
mjpeg_qsv_encoder_deps="libmfx"
mjpeg_qsv_encoder_select="qsvenc"
mjpeg_vaapi_encoder_deps="VAEncPictureParameterBufferJPEG"
mjpeg_vaapi_encoder_select="cbs_jpeg jpegtables vaapi_encode"
mp3_mf_encoder_deps="mediafoundation"
mpeg1_cuvid_decoder_deps="cuvid"
mpeg1_v4l2m2m_decoder_deps="v4l2_m2m mpeg1_v4l2_m2m"
mpeg2_crystalhd_decoder_select="crystalhd"
mpeg2_cuvid_decoder_deps="cuvid"
mpeg2_mmal_decoder_deps="mmal"
mpeg2_mediacodec_decoder_deps="mediacodec"
mpeg2_qsv_decoder_select="qsvdec"
mpeg2_qsv_encoder_select="qsvenc"
mpeg2_vaapi_encoder_select="cbs_mpeg2 vaapi_encode"
mpeg2_v4l2m2m_decoder_deps="v4l2_m2m mpeg2_v4l2_m2m"
mpeg4_crystalhd_decoder_select="crystalhd"
mpeg4_cuvid_decoder_deps="cuvid"
mpeg4_mediacodec_decoder_deps="mediacodec"
mpeg4_mmal_decoder_deps="mmal"
mpeg4_omx_encoder_deps="omx"
mpeg4_v4l2m2m_decoder_deps="v4l2_m2m mpeg4_v4l2_m2m"
mpeg4_v4l2m2m_encoder_deps="v4l2_m2m mpeg4_v4l2_m2m"
msmpeg4_crystalhd_decoder_select="crystalhd"
vc1_crystalhd_decoder_select="crystalhd"
vc1_cuvid_decoder_deps="cuvid"
vc1_mmal_decoder_deps="mmal"
vc1_qsv_decoder_select="qsvdec"
vc1_v4l2m2m_decoder_deps="v4l2_m2m vc1_v4l2_m2m"
vp8_cuvid_decoder_deps="cuvid"
vp8_mediacodec_decoder_deps="mediacodec"
vp8_qsv_decoder_select="qsvdec"
vp8_rkmpp_decoder_deps="rkmpp"
vp8_vaapi_encoder_deps="VAEncPictureParameterBufferVP8"
vp8_vaapi_encoder_select="vaapi_encode"
vp8_v4l2m2m_decoder_deps="v4l2_m2m vp8_v4l2_m2m"
vp8_v4l2m2m_encoder_deps="v4l2_m2m vp8_v4l2_m2m"
vp9_cuvid_decoder_deps="cuvid"
vp9_mediacodec_decoder_deps="mediacodec"
vp9_qsv_decoder_select="qsvdec"
vp9_rkmpp_decoder_deps="rkmpp"
vp9_vaapi_encoder_deps="VAEncPictureParameterBufferVP9"
vp9_vaapi_encoder_select="vaapi_encode"
vp9_qsv_encoder_deps="libmfx MFX_CODEC_VP9"
vp9_qsv_encoder_select="qsvenc"
vp9_v4l2m2m_decoder_deps="v4l2_m2m vp9_v4l2_m2m"
wmv3_crystalhd_decoder_select="crystalhd"
av1_qsv_decoder_select="qsvdec"

# parsers
aac_parser_select="adts_header mpeg4audio"
av1_parser_select="cbs_av1"
h264_parser_select="atsc_a53 golomb h264dsp h264parse"
hevc_parser_select="hevcparse"
mpegaudio_parser_select="mpegaudioheader"
mpegvideo_parser_select="mpegvideo"
mpeg4video_parser_select="h263dsp mpegvideodec qpeldsp"
vc1_parser_select="vc1dsp"

# bitstream_filters
aac_adtstoasc_bsf_select="adts_header mpeg4audio"
av1_frame_merge_bsf_select="cbs_av1"
av1_frame_split_bsf_select="cbs_av1"
av1_metadata_bsf_select="cbs_av1"
eac3_core_bsf_select="ac3_parser"
filter_units_bsf_select="cbs"
h264_metadata_bsf_deps="const_nan"
h264_metadata_bsf_select="cbs_h264"
h264_redundant_pps_bsf_select="cbs_h264"
hevc_metadata_bsf_select="cbs_h265"
mjpeg2jpeg_bsf_select="jpegtables"
mpeg2_metadata_bsf_select="cbs_mpeg2"
trace_headers_bsf_select="cbs"
vp9_metadata_bsf_select="cbs_vp9"

# external libraries
aac_at_decoder_deps="audiotoolbox"
aac_at_decoder_select="aac_adtstoasc_bsf"
ac3_at_decoder_deps="audiotoolbox"
ac3_at_decoder_select="ac3_parser"
adpcm_ima_qt_at_decoder_deps="audiotoolbox"
alac_at_decoder_deps="audiotoolbox"
amr_nb_at_decoder_deps="audiotoolbox"
avisynth_deps_any="libdl LoadLibrary"
avisynth_demuxer_deps="avisynth"
avisynth_demuxer_select="riffdec"
eac3_at_decoder_deps="audiotoolbox"
eac3_at_decoder_select="ac3_parser"
gsm_ms_at_decoder_deps="audiotoolbox"
ilbc_at_decoder_deps="audiotoolbox"
mp1_at_decoder_deps="audiotoolbox"
mp2_at_decoder_deps="audiotoolbox"
mp3_at_decoder_deps="audiotoolbox"
mp1_at_decoder_select="mpegaudioheader"
mp2_at_decoder_select="mpegaudioheader"
mp3_at_decoder_select="mpegaudioheader"
pcm_alaw_at_decoder_deps="audiotoolbox"
pcm_mulaw_at_decoder_deps="audiotoolbox"
qdmc_decoder_select="fft"
qdmc_at_decoder_deps="audiotoolbox"
qdm2_at_decoder_deps="audiotoolbox"
aac_at_encoder_deps="audiotoolbox"
aac_at_encoder_select="audio_frame_queue"
alac_at_encoder_deps="audiotoolbox"
alac_at_encoder_select="audio_frame_queue"
ilbc_at_encoder_deps="audiotoolbox"
ilbc_at_encoder_select="audio_frame_queue"
pcm_alaw_at_encoder_deps="audiotoolbox"
pcm_alaw_at_encoder_select="audio_frame_queue"
pcm_mulaw_at_encoder_deps="audiotoolbox"
pcm_mulaw_at_encoder_select="audio_frame_queue"
chromaprint_muxer_deps="chromaprint"
h264_videotoolbox_encoder_deps="pthreads"
h264_videotoolbox_encoder_select="atsc_a53 videotoolbox_encoder"
hevc_videotoolbox_encoder_deps="pthreads"
hevc_videotoolbox_encoder_select="atsc_a53 videotoolbox_encoder"
prores_videotoolbox_encoder_deps="pthreads"
prores_videotoolbox_encoder_select="videotoolbox_encoder"
libaom_av1_decoder_deps="libaom"
libaom_av1_encoder_deps="libaom"
libaom_av1_encoder_select="extract_extradata_bsf"
libaribb24_decoder_deps="libaribb24"
libcelt_decoder_deps="libcelt"
libcodec2_decoder_deps="libcodec2"
libcodec2_encoder_deps="libcodec2"
libdav1d_decoder_deps="libdav1d"
libdav1d_decoder_select="atsc_a53"
libdavs2_decoder_deps="libdavs2"
libfdk_aac_decoder_deps="libfdk_aac"
libfdk_aac_encoder_deps="libfdk_aac"
libfdk_aac_encoder_select="audio_frame_queue"
libgme_demuxer_deps="libgme"
libgsm_decoder_deps="libgsm"
libgsm_encoder_deps="libgsm"
libgsm_ms_decoder_deps="libgsm"
libgsm_ms_encoder_deps="libgsm"
libilbc_decoder_deps="libilbc"
libilbc_encoder_deps="libilbc"
libkvazaar_encoder_deps="libkvazaar"
libmodplug_demuxer_deps="libmodplug"
libmp3lame_encoder_deps="libmp3lame"
libmp3lame_encoder_select="audio_frame_queue mpegaudioheader"
libopencore_amrnb_decoder_deps="libopencore_amrnb"
libopencore_amrnb_encoder_deps="libopencore_amrnb"
libopencore_amrnb_encoder_select="audio_frame_queue"
libopencore_amrwb_decoder_deps="libopencore_amrwb"
libopenh264_decoder_deps="libopenh264"
libopenh264_decoder_select="h264_mp4toannexb_bsf"
libopenh264_encoder_deps="libopenh264"
libopenjpeg_decoder_deps="libopenjpeg"
libopenjpeg_encoder_deps="libopenjpeg"
libopenmpt_demuxer_deps="libopenmpt"
libopus_decoder_deps="libopus"
libopus_encoder_deps="libopus"
libopus_encoder_select="audio_frame_queue"
librav1e_encoder_deps="librav1e"
librav1e_encoder_select="extract_extradata_bsf"
librsvg_decoder_deps="librsvg"
libshine_encoder_deps="libshine"
libshine_encoder_select="audio_frame_queue mpegaudioheader"
libspeex_decoder_deps="libspeex"
libspeex_encoder_deps="libspeex"
libspeex_encoder_select="audio_frame_queue"
libsvtav1_encoder_deps="libsvtav1"
libtheora_encoder_deps="libtheora"
libtwolame_encoder_deps="libtwolame"
libuavs3d_decoder_deps="libuavs3d"
libvo_amrwbenc_encoder_deps="libvo_amrwbenc"
libvorbis_decoder_deps="libvorbis"
libvorbis_encoder_deps="libvorbis libvorbisenc"
libvorbis_encoder_select="audio_frame_queue"
libvpx_vp8_decoder_deps="libvpx"
libvpx_vp8_encoder_deps="libvpx"
libvpx_vp9_decoder_deps="libvpx"
libvpx_vp9_encoder_deps="libvpx"
libwebp_encoder_deps="libwebp"
libwebp_anim_encoder_deps="libwebp"
libx262_encoder_deps="libx262"
libx264_encoder_deps="libx264"
libx264_encoder_select="atsc_a53"
libx264rgb_encoder_deps="libx264"
libx264rgb_encoder_select="libx264_encoder"
libx265_encoder_deps="libx265"
libxavs_encoder_deps="libxavs"
libxavs2_encoder_deps="libxavs2"
libxvid_encoder_deps="libxvid"
libzvbi_teletext_decoder_deps="libzvbi"
vapoursynth_demuxer_deps="vapoursynth"
videotoolbox_suggest="coreservices"
videotoolbox_deps="corefoundation coremedia corevideo"
videotoolbox_encoder_deps="videotoolbox VTCompressionSessionPrepareToEncodeFrames"

# demuxers / muxers
ac3_demuxer_select="ac3_parser"
act_demuxer_select="riffdec"
adts_muxer_select="mpeg4audio"
aiff_muxer_select="iso_media"
amv_muxer_select="riffenc"
asf_demuxer_select="riffdec"
asf_o_demuxer_select="riffdec"
asf_muxer_select="riffenc"
asf_stream_muxer_select="asf_muxer"
av1_demuxer_select="av1_frame_merge_bsf av1_parser"
avi_demuxer_select="riffdec exif"
avi_muxer_select="riffenc"
caf_demuxer_select="iso_media"
caf_muxer_select="iso_media"
dash_muxer_select="mp4_muxer"
dash_demuxer_deps="libxml2"
dirac_demuxer_select="dirac_parser"
dts_demuxer_select="dca_parser"
dtshd_demuxer_select="dca_parser"
dv_demuxer_select="dvprofile"
dv_muxer_select="dvprofile"
dxa_demuxer_select="riffdec"
eac3_demuxer_select="ac3_parser"
f4v_muxer_select="mov_muxer"
fifo_muxer_deps="threads"
flac_demuxer_select="flac_parser"
flv_muxer_select="aac_adtstoasc_bsf"
gxf_muxer_select="pcm_rechunk_bsf"
hds_muxer_select="flv_muxer"
hls_demuxer_select="adts_header ac3_parser"
hls_muxer_select="mpegts_muxer"
hls_muxer_suggest="gcrypt openssl"
image2_alias_pix_demuxer_select="image2_demuxer"
image2_brender_pix_demuxer_select="image2_demuxer"
imf_demuxer_deps="libxml2"
imf_demuxer_select="mxf_demuxer"
ipod_muxer_select="mov_muxer"
ismv_muxer_select="mov_muxer"
ivf_muxer_select="av1_metadata_bsf vp9_superframe_bsf"
latm_muxer_select="aac_adtstoasc_bsf mpeg4audio"
matroska_audio_muxer_select="matroska_muxer"
matroska_demuxer_select="riffdec"
matroska_demuxer_suggest="bzlib lzo zlib"
matroska_muxer_select="mpeg4audio riffenc vp9_superframe_bsf aac_adtstoasc_bsf"
mlp_demuxer_select="mlp_parser"
mmf_muxer_select="riffenc"
mov_demuxer_select="iso_media riffdec"
mov_demuxer_suggest="zlib"
mov_muxer_select="iso_media riffenc rtpenc_chain vp9_superframe_bsf aac_adtstoasc_bsf"
mp3_demuxer_select="mpegaudio_parser"
mp3_muxer_select="mpegaudioheader"
mp4_muxer_select="mov_muxer"
mpegts_demuxer_select="iso_media"
mpegts_muxer_select="ac3_parser adts_muxer latm_muxer h264_mp4toannexb_bsf hevc_mp4toannexb_bsf"
mpegtsraw_demuxer_select="mpegts_demuxer"
mxf_muxer_select="pcm_rechunk_bsf"
mxf_d10_muxer_select="mxf_muxer"
mxf_opatom_muxer_select="mxf_muxer"
nut_muxer_select="riffenc"
nuv_demuxer_select="riffdec"
obu_demuxer_select="av1_frame_merge_bsf av1_parser"
obu_muxer_select="av1_metadata_bsf"
oga_muxer_select="ogg_muxer"
ogg_demuxer_select="dirac_parse"
ogv_muxer_select="ogg_muxer"
opus_muxer_select="ogg_muxer"
psp_muxer_select="mov_muxer"
rtp_demuxer_select="sdp_demuxer"
rtp_mpegts_muxer_select="mpegts_muxer rtp_muxer"
rtpdec_select="asf_demuxer mov_demuxer mpegts_demuxer rm_demuxer rtp_protocol srtp"
rtsp_demuxer_select="http_protocol rtpdec"
rtsp_muxer_select="rtp_muxer http_protocol rtp_protocol rtpenc_chain"
sap_demuxer_select="sdp_demuxer"
sap_muxer_select="rtp_muxer rtp_protocol rtpenc_chain"
sdp_demuxer_select="rtpdec"
smoothstreaming_muxer_select="ismv_muxer"
spdif_demuxer_select="adts_header"
spdif_muxer_select="adts_header"
spx_muxer_select="ogg_muxer"
swf_demuxer_suggest="zlib"
tak_demuxer_select="tak_parser"
truehd_demuxer_select="mlp_parser"
tg2_muxer_select="mov_muxer"
tgp_muxer_select="mov_muxer"
vobsub_demuxer_select="mpegps_demuxer"
w64_demuxer_select="wav_demuxer"
w64_muxer_select="wav_muxer"
wav_demuxer_select="riffdec"
wav_muxer_select="riffenc"
webm_chunk_muxer_select="webm_muxer"
webm_muxer_select="mpeg4audio riffenc"
webm_dash_manifest_demuxer_select="matroska_demuxer"
wtv_demuxer_select="mpegts_demuxer riffdec"
wtv_muxer_select="mpegts_muxer riffenc"
xmv_demuxer_select="riffdec"
xwma_demuxer_select="riffdec"

# indevs / outdevs
android_camera_indev_deps="android camera2ndk mediandk pthreads"
android_camera_indev_extralibs="-landroid -lcamera2ndk -lmediandk"
alsa_indev_deps="alsa"
alsa_outdev_deps="alsa"
avfoundation_indev_deps="avfoundation corevideo coremedia pthreads"
avfoundation_indev_suggest="coregraphics applicationservices"
avfoundation_indev_extralibs="-framework Foundation"
audiotoolbox_outdev_deps="audiotoolbox pthreads"
audiotoolbox_outdev_extralibs="-framework AudioToolbox -framework CoreAudio"
bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
caca_outdev_deps="libcaca"
decklink_deps_any="libdl LoadLibrary"
decklink_indev_deps="decklink threads"
decklink_indev_extralibs="-lstdc++"
decklink_outdev_deps="decklink threads"
decklink_outdev_suggest="libklvanc"
decklink_outdev_extralibs="-lstdc++"
dshow_indev_deps="IBaseFilter"
dshow_indev_extralibs="-lpsapi -lole32 -lstrmiids -luuid -loleaut32 -lshlwapi"
fbdev_indev_deps="linux_fb_h"
fbdev_outdev_deps="linux_fb_h"
gdigrab_indev_deps="CreateDIBSection"
gdigrab_indev_extralibs="-lgdi32"
gdigrab_indev_select="bmp_decoder"
iec61883_indev_deps="libiec61883"
jack_indev_deps="libjack"
jack_indev_deps_any="sem_timedwait dispatch_dispatch_h"
kmsgrab_indev_deps="libdrm"
lavfi_indev_deps="avfilter"
libcdio_indev_deps="libcdio"
libdc1394_indev_deps="libdc1394"
openal_indev_deps="openal"
opengl_outdev_deps="opengl"
opengl_outdev_suggest="sdl2"
oss_indev_deps_any="sys_soundcard_h"
oss_outdev_deps_any="sys_soundcard_h"
pulse_indev_deps="libpulse"
pulse_outdev_deps="libpulse"
sdl2_outdev_deps="sdl2"
sndio_indev_deps="sndio"
sndio_outdev_deps="sndio"
v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h"
v4l2_indev_suggest="libv4l2"
v4l2_outdev_deps_any="linux_videodev2_h sys_videoio_h"
v4l2_outdev_suggest="libv4l2"
vfwcap_indev_deps="vfw32 vfwcap_defines"
xcbgrab_indev_deps="libxcb"
xcbgrab_indev_suggest="libxcb_shm libxcb_shape libxcb_xfixes"
xv_outdev_deps="xlib_xv xlib_x11 xlib_xext"

# protocols
async_protocol_deps="threads"
bluray_protocol_deps="libbluray"
ffrtmpcrypt_protocol_conflict="librtmp_protocol"
ffrtmpcrypt_protocol_deps_any="gcrypt gmp openssl mbedtls"
ffrtmpcrypt_protocol_select="tcp_protocol"
ffrtmphttp_protocol_conflict="librtmp_protocol"
ffrtmphttp_protocol_select="http_protocol"
ftp_protocol_select="tcp_protocol"
gopher_protocol_select="tcp_protocol"
gophers_protocol_select="tls_protocol"
http_protocol_select="tcp_protocol"
http_protocol_suggest="zlib"
httpproxy_protocol_select="tcp_protocol"
httpproxy_protocol_suggest="zlib"
https_protocol_select="tls_protocol"
https_protocol_suggest="zlib"
icecast_protocol_select="http_protocol"
mmsh_protocol_select="http_protocol"
mmst_protocol_select="network"
rtmp_protocol_conflict="librtmp_protocol"
rtmp_protocol_select="tcp_protocol"
rtmp_protocol_suggest="zlib"
rtmpe_protocol_select="ffrtmpcrypt_protocol"
rtmpe_protocol_suggest="zlib"
rtmps_protocol_conflict="librtmp_protocol"
rtmps_protocol_select="tls_protocol"
rtmps_protocol_suggest="zlib"
rtmpt_protocol_select="ffrtmphttp_protocol"
rtmpt_protocol_suggest="zlib"
rtmpte_protocol_select="ffrtmpcrypt_protocol ffrtmphttp_protocol"
rtmpte_protocol_suggest="zlib"
rtmpts_protocol_select="ffrtmphttp_protocol https_protocol"
rtmpts_protocol_suggest="zlib"
rtp_protocol_select="udp_protocol"
schannel_conflict="openssl gnutls libtls mbedtls"
sctp_protocol_deps="struct_sctp_event_subscribe struct_msghdr_msg_flags"
sctp_protocol_select="network"
securetransport_conflict="openssl gnutls libtls mbedtls"
srtp_protocol_select="rtp_protocol srtp"
tcp_protocol_select="network"
tls_protocol_deps_any="gnutls openssl schannel securetransport libtls mbedtls"
tls_protocol_select="tcp_protocol"
udp_protocol_select="network"
udplite_protocol_select="network"
unix_protocol_deps="sys_un_h"
unix_protocol_select="network"

# external library protocols
libamqp_protocol_deps="librabbitmq"
libamqp_protocol_select="network"
librist_protocol_deps="librist"
librist_protocol_select="network"
librtmp_protocol_deps="librtmp"
librtmpe_protocol_deps="librtmp"
librtmps_protocol_deps="librtmp"
librtmpt_protocol_deps="librtmp"
librtmpte_protocol_deps="librtmp"
libsmbclient_protocol_deps="libsmbclient gplv3"
libsrt_protocol_deps="libsrt"
libsrt_protocol_select="network"
libssh_protocol_deps="libssh"
libtls_conflict="openssl gnutls mbedtls"
libzmq_protocol_deps="libzmq"
libzmq_protocol_select="network"

# filters
afir_filter_deps="avcodec"
afir_filter_select="rdft"
ametadata_filter_deps="avformat"
amovie_filter_deps="avcodec avformat"
aresample_filter_deps="swresample"
asr_filter_deps="pocketsphinx"
ass_filter_deps="libass"
atempo_filter_deps="avcodec"
atempo_filter_select="rdft"
avgblur_opencl_filter_deps="opencl"
avgblur_vulkan_filter_deps="vulkan spirv_compiler"
azmq_filter_deps="libzmq"
blackframe_filter_deps="gpl"
blend_vulkan_filter_deps="vulkan spirv_compiler"
bm3d_filter_deps="avcodec"
bm3d_filter_select="dct"
boxblur_filter_deps="gpl"
boxblur_opencl_filter_deps="opencl gpl"
bs2b_filter_deps="libbs2b"
chromaber_vulkan_filter_deps="vulkan spirv_compiler"
colorkey_opencl_filter_deps="opencl"
colormatrix_filter_deps="gpl"
convolution_opencl_filter_deps="opencl"
coreimage_filter_deps="coreimage appkit"
coreimage_filter_extralibs="-framework OpenGL"
coreimagesrc_filter_deps="coreimage appkit"
coreimagesrc_filter_extralibs="-framework OpenGL"
cover_rect_filter_deps="avcodec avformat gpl"
cropdetect_filter_deps="gpl"
deinterlace_qsv_filter_deps="libmfx"
deinterlace_vaapi_filter_deps="vaapi"
delogo_filter_deps="gpl"
denoise_vaapi_filter_deps="vaapi"
derain_filter_select="dnn"
deshake_filter_select="pixelutils"
deshake_opencl_filter_deps="opencl"
dilation_opencl_filter_deps="opencl"
dnn_classify_filter_select="dnn"
dnn_detect_filter_select="dnn"
dnn_processing_filter_select="dnn"
drawtext_filter_deps="libfreetype"
drawtext_filter_suggest="libfontconfig libfribidi"
elbg_filter_deps="avcodec"
eq_filter_deps="gpl"
erosion_opencl_filter_deps="opencl"
fftfilt_filter_deps="avcodec"
fftfilt_filter_select="rdft"
fftdnoiz_filter_deps="avcodec"
fftdnoiz_filter_select="fft"
find_rect_filter_deps="avcodec avformat gpl"
firequalizer_filter_deps="avcodec"
firequalizer_filter_select="rdft"
flip_vulkan_filter_deps="vulkan spirv_compiler"
flite_filter_deps="libflite"
framerate_filter_select="scene_sad"
freezedetect_filter_select="scene_sad"
frei0r_deps_any="libdl LoadLibrary"
frei0r_filter_deps="frei0r"
frei0r_src_filter_deps="frei0r"
fspp_filter_deps="gpl"
gblur_vulkan_filter_deps="vulkan spirv_compiler"
hflip_vulkan_filter_deps="vulkan spirv_compiler"
histeq_filter_deps="gpl"
hqdn3d_filter_deps="gpl"
interlace_filter_deps="gpl"
kerndeint_filter_deps="gpl"
ladspa_filter_deps="ladspa libdl"
lensfun_filter_deps="liblensfun version3"
libplacebo_filter_deps="libplacebo vulkan"
lv2_filter_deps="lv2"
mcdeint_filter_deps="avcodec gpl"
metadata_filter_deps="avformat"
movie_filter_deps="avcodec avformat"
mpdecimate_filter_deps="gpl"
mpdecimate_filter_select="pixelutils"
minterpolate_filter_select="scene_sad"
mptestsrc_filter_deps="gpl"
negate_filter_deps="lut_filter"
nlmeans_opencl_filter_deps="opencl"
nnedi_filter_deps="gpl"
ocr_filter_deps="libtesseract"
ocv_filter_deps="libopencv"
openclsrc_filter_deps="opencl"
overlay_opencl_filter_deps="opencl"
overlay_qsv_filter_deps="libmfx"
overlay_qsv_filter_select="qsvvpp"
overlay_vulkan_filter_deps="vulkan spirv_compiler"
owdenoise_filter_deps="gpl"
pad_opencl_filter_deps="opencl"
pan_filter_deps="swresample"
perspective_filter_deps="gpl"
phase_filter_deps="gpl"
pp7_filter_deps="gpl"
pp_filter_deps="gpl postproc"
prewitt_opencl_filter_deps="opencl"
procamp_vaapi_filter_deps="vaapi"
program_opencl_filter_deps="opencl"
pullup_filter_deps="gpl"
removelogo_filter_deps="avcodec avformat swscale"
repeatfields_filter_deps="gpl"
roberts_opencl_filter_deps="opencl"
rubberband_filter_deps="librubberband"
sab_filter_deps="gpl swscale"
scale2ref_filter_deps="swscale"
scale_filter_deps="swscale"
scale_qsv_filter_deps="libmfx"
scdet_filter_select="scene_sad"
select_filter_select="scene_sad"
sharpness_vaapi_filter_deps="vaapi"
showcqt_filter_deps="avformat swscale"
showcqt_filter_suggest="libfontconfig libfreetype"
showspatial_filter_deps="avcodec"
showspatial_filter_select="fft"
signature_filter_deps="gpl avcodec avformat"
sinc_filter_deps="avcodec"
sinc_filter_select="rdft"
smartblur_filter_deps="gpl swscale"
sobel_opencl_filter_deps="opencl"
sofalizer_filter_deps="libmysofa"
spp_filter_deps="gpl avcodec"
spp_filter_select="fft idctdsp fdctdsp me_cmp pixblockdsp"
sr_filter_deps="avformat swscale"
sr_filter_select="dnn"
stereo3d_filter_deps="gpl"
subtitles_filter_deps="avformat avcodec libass"
super2xsai_filter_deps="gpl"
pixfmts_super2xsai_test_deps="super2xsai_filter"
superequalizer_filter_deps="avcodec"
superequalizer_filter_select="rdft"
surround_filter_deps="avcodec"
surround_filter_select="rdft"
tinterlace_filter_deps="gpl"
tinterlace_merge_test_deps="tinterlace_filter"
tinterlace_pad_test_deps="tinterlace_filter"
tonemap_filter_deps="const_nan"
tonemap_vaapi_filter_deps="vaapi VAProcFilterParameterBufferHDRToneMapping"
tonemap_opencl_filter_deps="opencl const_nan"
transpose_opencl_filter_deps="opencl"
transpose_vaapi_filter_deps="vaapi VAProcPipelineCaps_rotation_flags"
transpose_vulkan_filter_deps="vulkan spirv_compiler"
unsharp_opencl_filter_deps="opencl"
uspp_filter_deps="gpl avcodec"
vaguedenoiser_filter_deps="gpl"
vflip_vulkan_filter_deps="vulkan spirv_compiler"
vidstabdetect_filter_deps="libvidstab"
vidstabtransform_filter_deps="libvidstab"
libvmaf_filter_deps="libvmaf pthreads"
zmq_filter_deps="libzmq"
zoompan_filter_deps="swscale"
zscale_filter_deps="libzimg const_nan"
scale_vaapi_filter_deps="vaapi"
scale_vulkan_filter_deps="vulkan spirv_compiler"
vpp_qsv_filter_deps="libmfx"
vpp_qsv_filter_select="qsvvpp"
xfade_opencl_filter_deps="opencl"
yadif_cuda_filter_deps="ffnvcodec"
yadif_cuda_filter_deps_any="cuda_nvcc cuda_llvm"
yadif_videotoolbox_filter_deps="metal corevideo videotoolbox"

# examples
avio_list_dir_deps="avformat avutil"
avio_reading_deps="avformat avcodec avutil"
decode_audio_example_deps="avcodec avutil"
decode_video_example_deps="avcodec avutil"
demuxing_decoding_example_deps="avcodec avformat avutil"
encode_audio_example_deps="avcodec avutil"
encode_video_example_deps="avcodec avutil"
extract_mvs_example_deps="avcodec avformat avutil"
filter_audio_example_deps="avfilter avutil"
filtering_audio_example_deps="avfilter avcodec avformat avutil"
filtering_video_example_deps="avfilter avcodec avformat avutil"
http_multiclient_example_deps="avformat avutil fork"
hw_decode_example_deps="avcodec avformat avutil"
metadata_example_deps="avformat avutil"
muxing_example_deps="avcodec avformat avutil swscale"
qsvdec_example_deps="avcodec avutil libmfx h264_qsv_decoder"
remuxing_example_deps="avcodec avformat avutil"
resampling_audio_example_deps="avutil swresample"
scaling_video_example_deps="avutil swscale"
transcode_aac_example_deps="avcodec avformat swresample"
transcoding_example_deps="avfilter avcodec avformat avutil"
vaapi_encode_example_deps="avcodec avutil h264_vaapi_encoder"
vaapi_transcode_example_deps="avcodec avformat avutil h264_vaapi_encoder"

# EXTRALIBS_LIST
cpu_init_extralibs="pthreads_extralibs"
cws2fws_extralibs="zlib_extralibs"

# libraries, in any order
avcodec_deps="avutil"
avcodec_suggest="libm"
avdevice_deps="avformat avcodec avutil"
avdevice_suggest="libm"
avfilter_deps="avutil"
avfilter_suggest="libm"
avformat_deps="avcodec avutil"
avformat_suggest="libm network zlib"
avutil_suggest="clock_gettime ffnvcodec libm libdrm libmfx opencl user32 vaapi vulkan videotoolbox corefoundation corevideo coremedia bcrypt"
postproc_deps="avutil gpl"
postproc_suggest="libm"
swresample_deps="avutil"
swresample_suggest="libm libsoxr"
swscale_deps="avutil"
swscale_suggest="libm"

avcodec_extralibs="pthreads_extralibs iconv_extralibs dxva2_extralibs"
avfilter_extralibs="pthreads_extralibs"
avutil_extralibs="d3d11va_extralibs nanosleep_extralibs pthreads_extralibs vaapi_drm_extralibs vaapi_x11_extralibs vdpau_x11_extralibs"

# programs
ffmpeg_deps="avcodec avfilter avformat"
ffmpeg_select="aformat_filter anull_filter atrim_filter format_filter
               hflip_filter null_filter
               transpose_filter trim_filter vflip_filter"
ffmpeg_suggest="ole32 psapi shell32"
ffplay_deps="avcodec avformat swscale swresample sdl2"
ffplay_select="rdft crop_filter transpose_filter hflip_filter vflip_filter rotate_filter"
ffplay_suggest="shell32"
ffprobe_deps="avcodec avformat"
ffprobe_suggest="shell32"

# documentation
podpages_deps="perl"
manpages_deps="perl pod2man"
htmlpages_deps="perl"
htmlpages_deps_any="makeinfo_html texi2html"
txtpages_deps="perl makeinfo"
doc_deps_any="manpages htmlpages podpages txtpages"

# default parameters

logfile="ffbuild/config.log"

# installation paths
prefix_default="/usr/local"
bindir_default='${prefix}/bin'
datadir_default='${prefix}/share/ffmpeg'
docdir_default='${prefix}/share/doc/ffmpeg'
incdir_default='${prefix}/include'
libdir_default='${prefix}/lib'
mandir_default='${prefix}/share/man'

# toolchain
ar_default="ar"
cc_default="gcc"
cxx_default="g++"
host_cc_default="gcc"
doxygen_default="doxygen"
install="install"
ln_s_default="ln -s -f"
metalcc_default="xcrun -sdk macosx metal"
metallib_default="xcrun -sdk macosx metallib"
nm_default="nm -g"
pkg_config_default=pkg-config
ranlib_default="ranlib"
strip_default="strip"
version_script='--version-script'
objformat="elf32"
x86asmexe_default="nasm"
windres_default="windres"
striptype="direct"

# OS
target_os_default=$(tolower $(uname -s))
host_os=$target_os_default

# machine
if test "$target_os_default" = aix; then
    arch_default=$(uname -p)
    strip_default="strip -X32_64"
    nm_default="nm -g -X32_64"
else
    arch_default=$(uname -m)
fi
cpu="generic"
intrinsics="none"

# configurable options
enable $PROGRAM_LIST
enable $DOCUMENT_LIST
enable $EXAMPLE_LIST
enable $LIBRARY_LIST
enable stripping

enable asm
enable debug
enable doc
enable faan faandct faanidct
enable large_tests
enable optimizations
enable ptx_compression
enable runtime_cpudetect
enable safe_bitstream_reader
enable static
enable swscale_alpha
enable valgrind_backtrace

sws_max_filter_size_default=256
set_default sws_max_filter_size

# internal components are enabled by default
enable $EXTRALIBS_LIST

# Avoid external, non-system, libraries getting enabled by dependency resolution
disable $EXTERNAL_LIBRARY_LIST $HWACCEL_LIBRARY_LIST

# build settings
SHFLAGS='-shared -Wl,-soname,$$(@F)'
LIBPREF="lib"
LIBSUF=".a"
FULLNAME='$(NAME)$(BUILDSUF)'
LIBNAME='$(LIBPREF)$(FULLNAME)$(LIBSUF)'
SLIBPREF="lib"
SLIBSUF=".so"
SLIBNAME='$(SLIBPREF)$(FULLNAME)$(SLIBSUF)'
SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'
VERSION_SCRIPT_POSTPROCESS_CMD="cat"

asflags_filter=echo
cflags_filter=echo
ldflags_filter=echo

AS_C='-c'
AS_O='-o $@'
CC_C='-c'
CC_E='-E -o $@'
CC_O='-o $@'
CXX_C='-c'
CXX_O='-o $@'
OBJCC_C='-c'
OBJCC_E='-E -o $@'
OBJCC_O='-o $@'
X86ASM_O='-o $@'
LD_O='-o $@'
LD_LIB='-l%'
LD_PATH='-L'
HOSTCC_C='-c'
HOSTCC_E='-E -o $@'
HOSTCC_O='-o $@'
HOSTLD_O='-o $@'
NVCC_C='-c'
NVCC_O='-o $@'

host_extralibs='-lm'
host_cflags_filter=echo
host_ldflags_filter=echo

target_path='$(CURDIR)'

# since the object filename is not given with the -MM flag, the compiler
# is only able to print the basename, and we must add the path ourselves
DEPCMD='$(DEP$(1)) $(DEP$(1)FLAGS) $($(1)DEP_FLAGS) $< 2>/dev/null | sed -e "/^\#.*/d" -e "s,^[[:space:]]*$(@F),$(@D)/$(@F)," > $(@:.o=.d)'
DEPFLAGS='-MM'

mkdir -p ffbuild

# find source path
if test -f configure; then
    source_path=.
elif test -f src/configure; then
    source_path=src
else
    source_path=$(cd $(dirname "$0"); pwd)
    case "$source_path" in
        *[[:blank:]]*) die "Out of tree builds are impossible with whitespace in source path." ;;
    esac
    test -e "$source_path/config.h" &&
        die "Out of tree builds are impossible with config.h in source dir."
fi

for v in "$@"; do
    r=${v#*=}
    l=${v%"$r"}
    r=$(sh_quote "$r")
    FFMPEG_CONFIGURATION="${FFMPEG_CONFIGURATION# } ${l}${r}"
done

find_things_extern(){
    thing=$1
    pattern=$2
    file=$source_path/$3
    out=${4:-$thing}
    sed -n "s/^[^#]*extern.*$pattern *ff_\([^ ]*\)_$thing;/\1_$out/p" "$file"
}

find_filters_extern(){
    file=$source_path/$1
    sed -n 's/^extern const AVFilter ff_[avfsinkrc]\{2,5\}_\([[:alnum:]_]\{1,\}\);/\1_filter/p' $file
}

FILTER_LIST=$(find_filters_extern libavfilter/allfilters.c)
OUTDEV_LIST=$(find_things_extern muxer AVOutputFormat libavdevice/alldevices.c outdev)
INDEV_LIST=$(find_things_extern demuxer AVInputFormat libavdevice/alldevices.c indev)
MUXER_LIST=$(find_things_extern muxer AVOutputFormat libavformat/allformats.c)
DEMUXER_LIST=$(find_things_extern demuxer AVInputFormat libavformat/allformats.c)
ENCODER_LIST=$(find_things_extern encoder AVCodec libavcodec/allcodecs.c)
DECODER_LIST=$(find_things_extern decoder AVCodec libavcodec/allcodecs.c)
CODEC_LIST="
    $ENCODER_LIST
    $DECODER_LIST
"
PARSER_LIST=$(find_things_extern parser AVCodecParser libavcodec/parsers.c)
BSF_LIST=$(find_things_extern bsf AVBitStreamFilter libavcodec/bitstream_filters.c)
HWACCEL_LIST=$(find_things_extern hwaccel AVHWAccel libavcodec/hwaccels.h)
PROTOCOL_LIST=$(find_things_extern protocol URLProtocol libavformat/protocols.c)

AVCODEC_COMPONENTS_LIST="
    $BSF_LIST
    $DECODER_LIST
    $ENCODER_LIST
    $HWACCEL_LIST
    $PARSER_LIST
"

AVDEVICE_COMPONENTS_LIST="
    $INDEV_LIST
    $OUTDEV_LIST
"

AVFILTER_COMPONENTS_LIST="
    $FILTER_LIST
"

AVFORMAT_COMPONENTS_LIST="
    $DEMUXER_LIST
    $MUXER_LIST
    $PROTOCOL_LIST
"

ALL_COMPONENTS="
    $AVCODEC_COMPONENTS_LIST
    $AVDEVICE_COMPONENTS_LIST
    $AVFILTER_COMPONENTS_LIST
    $AVFORMAT_COMPONENTS_LIST
"

for n in $COMPONENT_LIST; do
    v=$(toupper ${n%s})_LIST
    eval enable \$$v
    eval ${n}_if_any="\$$v"
done

enable $ARCH_EXT_LIST

die_unknown(){
    echo "Unknown option \"$1\"."
    echo "See $0 --help for available options."
    exit 1
}

print_in_columns() {
    tr ' ' '\n' | sort | tr '\r\n' '  ' | awk -v col_width=24 -v width="$ncols" '
    {
        num_cols = width > col_width ? int(width / col_width) : 1;
        num_rows = int((NF + num_cols-1) / num_cols);
        y = x = 1;
        for (y = 1; y <= num_rows; y++) {
            i = y;
            for (x = 1; x <= num_cols; x++) {
                if (i <= NF) {
                  line = sprintf("%s%-" col_width "s", line, $i);
                }
                i = i + num_rows;
            }
            print line; line = "";
        }
    }' | sed 's/ *$//'
}

show_list() {
    suffix=_$1
    shift
    echo $* | sed s/$suffix//g | print_in_columns
    exit 0
}

rand_list(){
    IFS=', '
    set -- $*
    unset IFS
    for thing; do
        comp=${thing%:*}
        prob=${thing#$comp}
        prob=${prob#:}
        is_in ${comp} $COMPONENT_LIST && eval comp=\$$(toupper ${comp%s})_LIST
        echo "prob ${prob:-0.5}"
        printf '%s\n' $comp
    done
}

do_random(){
    action=$1
    shift
    random_seed=$(awk "BEGIN { srand($random_seed); print srand() }")
    $action $(rand_list "$@" | awk "BEGIN { srand($random_seed) } \$1 == \"prob\" { prob = \$2; next } rand() < prob { print }")
}

for opt do
    optval="${opt#*=}"
    case "$opt" in
        --extra-ldflags=*)
            add_ldflags $optval
        ;;
        --extra-ldexeflags=*)
            add_ldexeflags $optval
        ;;
        --extra-ldsoflags=*)
            add_ldsoflags $optval
        ;;
        --extra-ldlibflags=*)
            warn "The --extra-ldlibflags option is only provided for compatibility and will be\n"\
                 "removed in the future. Use --extra-ldsoflags instead."
            add_ldsoflags $optval
        ;;
        --extra-libs=*)
            add_extralibs $optval
        ;;
        --disable-devices)
            disable $INDEV_LIST $OUTDEV_LIST
        ;;
        --enable-debug=*)
            debuglevel="$optval"
        ;;
        --disable-programs)
            disable $PROGRAM_LIST
        ;;
        --disable-everything)
            map 'eval unset \${$(toupper ${v%s})_LIST}' $COMPONENT_LIST
        ;;
        --disable-all)
            map 'eval unset \${$(toupper ${v%s})_LIST}' $COMPONENT_LIST
            disable $LIBRARY_LIST $PROGRAM_LIST doc
            enable avutil
        ;;
        --enable-random|--disable-random)
            action=${opt%%-random}
            do_random ${action#--} $COMPONENT_LIST
        ;;
        --enable-random=*|--disable-random=*)
            action=${opt%%-random=*}
            do_random ${action#--} $optval
        ;;
        --enable-sdl)
            enable sdl2
        ;;
        --enable-*=*|--disable-*=*)
            eval $(echo "${opt%%=*}" | sed 's/--/action=/;s/-/ thing=/')
            is_in "${thing}s" $COMPONENT_LIST || die_unknown "$opt"
            eval list=\$$(toupper $thing)_LIST
            name=$(echo "${optval}" | sed "s/,/_${thing}|/g")_${thing}
            list=$(filter "$name" $list)
            [ "$list" = "" ] && warn "Option $opt did not match anything"
            test $action = enable && warn_if_gets_disabled $list
            $action $list
        ;;
        --enable-yasm|--disable-yasm)
            warn "The ${opt} option is only provided for compatibility and will be\n"\
                 "removed in the future. Use --enable-x86asm / --disable-x86asm instead."
            test $opt = --enable-yasm && x86asm=yes || x86asm=no
        ;;
        --yasmexe=*)
            warn "The --yasmexe option is only provided for compatibility and will be\n"\
                 "removed in the future. Use --x86asmexe instead."
            x86asmexe="$optval"
        ;;
        --enable-?*|--disable-?*)
            eval $(echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g')
            if is_in $option $COMPONENT_LIST; then
                test $action = disable && action=unset
                eval $action \$$(toupper ${option%s})_LIST
            elif is_in $option $CMDLINE_SELECT; then
                $action $option
            else
                die_unknown $opt
            fi
        ;;
        --list-*)
            NAME="${opt#--list-}"
            is_in $NAME $COMPONENT_LIST || die_unknown $opt
            NAME=${NAME%s}
            eval show_list $NAME \$$(toupper $NAME)_LIST
        ;;
        --help|-h) show_help
        ;;
        --quiet|-q) quiet=yes
        ;;
        --fatal-warnings) enable fatal_warnings
        ;;
        --libfuzzer=*)
            libfuzzer_path="$optval"
        ;;
        *)
            optname="${opt%%=*}"
            optname="${optname#--}"
            optname=$(echo "$optname" | sed 's/-/_/g')
            if is_in $optname $CMDLINE_SET; then
                eval $optname='$optval'
            elif is_in $optname $CMDLINE_APPEND; then
                append $optname "$optval"
            else
                die_unknown $opt
            fi
        ;;
    esac
done

for e in $env; do
    eval "export $e"
done

if disabled autodetect; then

    # Unless iconv is explicitely disabled by the user, we still want to probe
    # for the iconv from the libc.
    disabled iconv || enable libc_iconv

    disable_weak $EXTERNAL_AUTODETECT_LIBRARY_LIST
    disable_weak $HWACCEL_AUTODETECT_LIBRARY_LIST
fi
# Mark specifically enabled, but normally autodetected libraries as requested.
for lib in $AUTODETECT_LIBS; do
    enabled $lib && request $lib
done
#TODO: switch to $AUTODETECT_LIBS when $THREADS_LIST is supported the same way
enable_weak $EXTERNAL_AUTODETECT_LIBRARY_LIST
enable_weak $HWACCEL_AUTODETECT_LIBRARY_LIST

disabled logging && logfile=/dev/null

# command line configuration sanity checks

# we need to build at least one lib type
if ! enabled_any static shared; then
    cat <<EOF
At least one library type must be built.
Specify --enable-static to build the static libraries or --enable-shared to
build the shared libraries as well. To only build the shared libraries specify
--disable-static in addition to --enable-shared.
EOF
    exit 1
fi

die_license_disabled() {
    enabled $1 || { enabled $v && die "$v is $1 and --enable-$1 is not specified."; }
}

die_license_disabled_gpl() {
    enabled $1 || { enabled $v && die "$v is incompatible with the gpl and --enable-$1 is not specified."; }
}

map "die_license_disabled gpl"      $EXTERNAL_LIBRARY_GPL_LIST $EXTERNAL_LIBRARY_GPLV3_LIST
map "die_license_disabled version3" $EXTERNAL_LIBRARY_VERSION3_LIST $EXTERNAL_LIBRARY_GPLV3_LIST

enabled gpl && map "die_license_disabled_gpl nonfree" $EXTERNAL_LIBRARY_NONFREE_LIST
map "die_license_disabled nonfree" $HWACCEL_LIBRARY_NONFREE_LIST

enabled version3 && { enabled gpl && enable gplv3 || enable lgplv3; }

if enabled nonfree; then
    license="nonfree and unredistributable"
elif enabled gplv3; then
    license="GPL version 3 or later"
elif enabled lgplv3; then
    license="LGPL version 3 or later"
elif enabled gpl; then
    license="GPL version 2 or later"
else
    license="LGPL version 2.1 or later"
fi

enabled_all gnutls openssl &&
    die "GnuTLS and OpenSSL must not be enabled at the same time."

enabled_all gnutls mbedtls &&
    die "GnuTLS and mbedTLS must not be enabled at the same time."

enabled_all openssl mbedtls &&
    die "OpenSSL and mbedTLS must not be enabled at the same time."

# Disable all the library-specific components if the library itself
# is disabled, see AVCODEC_LIST and following _LIST variables.

disable_components(){
    disabled ${1} && disable $(
        eval components="\$$(toupper ${1})_COMPONENTS"
        map 'eval echo \${$(toupper ${v%s})_LIST}' $components
    )
}

map 'disable_components $v' $LIBRARY_LIST

echo "# $0 $FFMPEG_CONFIGURATION" > $logfile
set >> $logfile

test -n "$valgrind" && toolchain="valgrind-memcheck"

enabled ossfuzz && ! echo $CFLAGS | grep -q -- "-fsanitize="  && ! echo $CFLAGS | grep -q -- "-fcoverage-mapping" &&{
    add_cflags  -fsanitize=address,undefined -fsanitize-coverage=trace-pc-guard,trace-cmp -fno-omit-frame-pointer
    add_ldflags -fsanitize=address,undefined -fsanitize-coverage=trace-pc-guard,trace-cmp
}

case "$toolchain" in
    *-asan)
        cc_default="${toolchain%-asan}"
        add_cflags  -fsanitize=address
        add_ldflags -fsanitize=address
    ;;
    *-msan)
        cc_default="${toolchain%-msan}"
        add_cflags  -fsanitize=memory -fsanitize-memory-track-origins
        add_ldflags -fsanitize=memory
    ;;
    *-tsan)
        cc_default="${toolchain%-tsan}"
        add_cflags  -fsanitize=thread
        add_ldflags -fsanitize=thread
        case "$toolchain" in
            gcc-tsan)
                add_cflags  -fPIC
                add_ldflags -fPIC
                ;;
        esac
    ;;
    *-usan)
        cc_default="${toolchain%-usan}"
        add_cflags  -fsanitize=undefined
        add_ldflags -fsanitize=undefined
    ;;
    valgrind-*)
        target_exec_default="valgrind"
        case "$toolchain" in
            valgrind-massif)
                target_exec_args="--tool=massif --alloc-fn=av_malloc --alloc-fn=av_mallocz --alloc-fn=av_calloc --alloc-fn=av_fast_padded_malloc --alloc-fn=av_fast_malloc --alloc-fn=av_realloc_f --alloc-fn=av_fast_realloc --alloc-fn=av_realloc"
                ;;
            valgrind-memcheck)
                target_exec_args="--error-exitcode=1 --malloc-fill=0x2a --track-origins=yes --leak-check=full --gen-suppressions=all --suppressions=$source_path/tests/fate-valgrind.supp"
                ;;
        esac
    ;;
    msvc)
        # Check whether the current MSVC version needs the C99 converter.
        # From MSVC 2013 (compiler major version 18) onwards, it does actually
        # support enough of C99 to build ffmpeg. Default to the new
        # behaviour if the regexp was unable to match anything, since this
        # successfully parses the version number of existing supported
        # versions that require the converter (MSVC 2010 and 2012).
        cl_major_ver=$(cl.exe 2>&1 | sed -n 's/.*Version \([[:digit:]]\{1,\}\)\..*/\1/p')
        if [ -z "$cl_major_ver" ] || [ $cl_major_ver -ge 18 ]; then
            cc_default="cl.exe"
            cxx_default="cl.exe"
        else
            die "Unsupported MSVC version (2013 or newer required)"
        fi
        ld_default="$source_path/compat/windows/mslink"
        nm_default="dumpbin.exe -symbols"
        ar_default="lib.exe"
        case "${arch:-$arch_default}" in
        aarch64|arm64)
            as_default="armasm64.exe"
            ;;
        arm*)
            as_default="armasm.exe"
            ;;
        esac
        target_os_default="win32"
        # Use a relative path for TMPDIR. This makes sure all the
        # ffconf temp files are written with a relative path, avoiding
        # issues with msys/win32 path conversion for MSVC parameters
        # such as -Fo<file> or -out:<file>.
        TMPDIR=.
    ;;
    icl)
        cc_default="icl"
        ld_default="xilink"
        nm_default="dumpbin -symbols"
        ar_default="xilib"
        target_os_default="win32"
        TMPDIR=.
    ;;
    gcov)
        add_cflags  -fprofile-arcs -ftest-coverage
        add_ldflags -fprofile-arcs -ftest-coverage
    ;;
    llvm-cov)
        add_cflags -fprofile-arcs -ftest-coverage
        add_ldflags --coverage
    ;;
    hardened)
        add_cppflags -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
        add_cflags   -fno-strict-overflow -fstack-protector-all
        add_ldflags  -Wl,-z,relro -Wl,-z,now
        add_cflags   -fPIE
        add_ldexeflags -fPIE -pie
    ;;
    ?*)
        die "Unknown toolchain $toolchain"
    ;;
esac

if test -n "$cross_prefix"; then
    test -n "$arch" && test -n "$target_os" ||
        die "Must specify target arch (--arch) and OS (--target-os) when cross-compiling"
    enable cross_compile
fi

set_default target_os
if test "$target_os" = android; then
    cc_default="clang"
fi

ar_default="${cross_prefix}${ar_default}"
cc_default="${cross_prefix}${cc_default}"
cxx_default="${cross_prefix}${cxx_default}"
nm_default="${cross_prefix}${nm_default}"
pkg_config_default="${cross_prefix}${pkg_config_default}"
if ${cross_prefix}${ranlib_default} 2>&1 | grep -q "\-D "; then
    ranlib_default="${cross_prefix}${ranlib_default} -D"
else
    ranlib_default="${cross_prefix}${ranlib_default}"
fi
strip_default="${cross_prefix}${strip_default}"
windres_default="${cross_prefix}${windres_default}"

sysinclude_default="${sysroot}/usr/include"

if enabled cuda_sdk; then
    warn "Option --enable-cuda-sdk is deprecated. Use --enable-cuda-nvcc instead."
    enable cuda_nvcc
fi

if enabled cuda_nvcc; then
    nvcc_default="nvcc"
    nvccflags_default="-gencode arch=compute_30,code=sm_30 -O2"
else
    nvcc_default="clang"
    nvccflags_default="--cuda-gpu-arch=sm_30 -O2"
    NVCC_C=""
fi

set_default nvcc

if enabled cuda_nvcc; then
    if $nvcc $nvccflags_default 2>&1 | grep -qi unsupported; then
        nvccflags_default="-gencode arch=compute_60,code=sm_60 -O2"
    fi
fi

set_default arch cc cxx doxygen pkg_config ranlib strip sysinclude \
    target_exec x86asmexe metalcc metallib
enabled cross_compile || host_cc_default=$cc
set_default host_cc

pkg_config_fail_message=""
if ! $pkg_config --version >/dev/null 2>&1; then
    warn "$pkg_config not found, library detection may fail."
    pkg_config=false
elif is_in -static $cc $LDFLAGS && ! is_in --static $pkg_config $pkg_config_flags; then
    pkg_config_fail_message="
Note: When building a static binary, add --pkg-config-flags=\"--static\"."
fi

if test $doxygen != $doxygen_default && \
  ! $doxygen --version >/dev/null 2>&1; then
    warn "Specified doxygen \"$doxygen\" not found, API documentation will fail to build."
fi

exesuf() {
    case $1 in
        mingw32*|mingw64*|msys*|win32|win64|cygwin*|*-dos|freedos|opendos|os/2*|symbian) echo .exe ;;
    esac
}

EXESUF=$(exesuf $target_os)
HOSTEXESUF=$(exesuf $host_os)

# set temporary file name
: ${TMPDIR:=$TEMPDIR}
: ${TMPDIR:=$TMP}
: ${TMPDIR:=/tmp}

if [ -n "$tempprefix" ] ; then
    mktemp(){
        tmpname="$tempprefix.${HOSTNAME}.${UID}"
        echo "$tmpname"
        mkdir "$tmpname"
    }
elif ! test_cmd mktemp -u XXXXXX; then
    # simple replacement for missing mktemp
    # NOT SAFE FOR GENERAL USE
    mktemp(){
        tmpname="${2%%XXX*}.${HOSTNAME}.${UID}.$$"
        echo "$tmpname"
        mkdir "$tmpname"
    }
fi

FFTMPDIR=$(mktemp -d "${TMPDIR}/ffconf.XXXXXXXX" 2> /dev/null) ||
    die "Unable to create temporary directory in $TMPDIR."

tmpfile(){
    tmp="${FFTMPDIR}/test"$2
    (set -C; exec > $tmp) 2> /dev/null ||
        die "Unable to create temporary file in $FFTMPDIR."
    eval $1=$tmp
}

trap 'rm -rf -- "$FFTMPDIR"' EXIT
trap 'exit 2' INT

tmpfile TMPASM .asm
tmpfile TMPC   .c
tmpfile TMPCPP .cpp
tmpfile TMPE   $EXESUF
tmpfile TMPH   .h
tmpfile TMPM   .m
tmpfile TMPCU  .cu
tmpfile TMPO   .o
tmpfile TMPS   .S
tmpfile TMPSH  .sh
tmpfile TMPV   .ver

unset -f mktemp

chmod +x $TMPE

# make sure we can execute files in $TMPDIR
cat > $TMPSH 2>> $logfile <<EOF
#! /bin/sh
EOF
chmod +x $TMPSH >> $logfile 2>&1
if ! $TMPSH >> $logfile 2>&1; then
    cat <<EOF
Unable to create and execute files in $TMPDIR.  Set the TMPDIR environment
variable to another directory and make sure that it is not mounted noexec.
EOF
    die "Sanity test failed."
fi

armasm_flags(){
    for flag; do
        case $flag in
            # Filter out MSVC cl.exe options from cflags that shouldn't
            # be passed to gas-preprocessor
            -M[TD]*)                                            ;;
            *)                  echo $flag                      ;;
        esac
   done
}

cparser_flags(){
    for flag; do
        case $flag in
            -Wno-switch)             echo -Wno-switch-enum ;;
            -Wno-format-zero-length) ;;
            -Wdisabled-optimization) ;;
            -Wno-pointer-sign)       echo -Wno-other ;;
            *)                       echo $flag ;;
        esac
    done
}

msvc_common_flags(){
    for flag; do
        case $flag in
            # In addition to specifying certain flags under the compiler
            # specific filters, they must be specified here as well or else the
            # generic catch all at the bottom will print the original flag.
            -Wall)                ;;
            -Wextra)              ;;
            -std=c*)              ;;
            # Common flags
            -fomit-frame-pointer) ;;
            -g)                   echo -Z7 ;;
            -fno-math-errno)      ;;
            -fno-common)          ;;
            -fno-signed-zeros)    ;;
            -fPIC)                ;;
            -mthumb)              ;;
            -march=*)             ;;
            -lz)                  echo zlib.lib ;;
            -lx264)               echo libx264.lib ;;
            -lstdc++)             ;;
            -l*)                  echo ${flag#-l}.lib ;;
            -LARGEADDRESSAWARE)   echo $flag ;;
            -L*)                  echo -libpath:${flag#-L} ;;
            -Wl,*)                ;;
            *)                    echo $flag ;;
        esac
    done
}

msvc_flags(){
    msvc_common_flags "$@"
    for flag; do
        case $flag in
            -Wall)                echo -W3 -wd4018 -wd4146 -wd4244 -wd4305     \
                                       -wd4554 ;;
            -Wextra)              echo -W4 -wd4244 -wd4127 -wd4018 -wd4389     \
                                       -wd4146 -wd4057 -wd4204 -wd4706 -wd4305 \
                                       -wd4152 -wd4324 -we4013 -wd4100 -wd4214 \
                                       -wd4307 \
                                       -wd4273 -wd4554 -wd4701 -wd4703 ;;
        esac
    done
}

icl_flags(){
    msvc_common_flags "$@"
    for flag; do
        case $flag in
            # Despite what Intel's documentation says -Wall, which is supported
            # on Windows, does enable remarks so disable them here.
            -Wall)                echo $flag -Qdiag-disable:remark ;;
            -std=c99)             echo -Qstd=c99 ;;
            -flto)                echo -ipo ;;
        esac
    done
}

icc_flags(){
    for flag; do
        case $flag in
            -flto)                echo -ipo ;;
            *)                    echo $flag ;;
        esac
    done
}

suncc_flags(){
    for flag; do
        case $flag in
            -march=*|-mcpu=*)
                case "${flag#*=}" in
                    native)                   echo -xtarget=native       ;;
                    v9|niagara)               echo -xarch=sparc          ;;
                    ultrasparc)               echo -xarch=sparcvis       ;;
                    ultrasparc3|niagara2)     echo -xarch=sparcvis2      ;;
                    i586|pentium)             echo -xchip=pentium        ;;
                    i686|pentiumpro|pentium2) echo -xtarget=pentium_pro  ;;
                    pentium3*|c3-2)           echo -xtarget=pentium3     ;;
                    pentium-m)          echo -xarch=sse2 -xchip=pentium3 ;;
                    pentium4*)          echo -xtarget=pentium4           ;;
                    prescott|nocona)    echo -xarch=sse3 -xchip=pentium4 ;;
                    *-sse3)             echo -xarch=sse3                 ;;
                    core2)              echo -xarch=ssse3 -xchip=core2   ;;
                    bonnell)                   echo -xarch=ssse3         ;;
                    corei7|nehalem)            echo -xtarget=nehalem     ;;
                    westmere)                  echo -xtarget=westmere    ;;
                    silvermont)                echo -xarch=sse4_2        ;;
                    corei7-avx|sandybridge)    echo -xtarget=sandybridge ;;
                    core-avx*|ivybridge|haswell|broadwell|skylake*|knl)
                                               echo -xarch=avx           ;;
                    amdfam10|barcelona)        echo -xtarget=barcelona   ;;
                    btver1)                    echo -xarch=amdsse4a      ;;
                    btver2|bdver*|znver*)      echo -xarch=avx           ;;
                    athlon-4|athlon-[mx]p)     echo -xarch=ssea          ;;
                    k8|opteron|athlon64|athlon-fx)
                                               echo -xarch=sse2a         ;;
                    athlon*)                   echo -xarch=pentium_proa  ;;
                esac
                ;;
            -std=c99)             echo -xc99              ;;
            -fomit-frame-pointer) echo -xregs=frameptr    ;;
            -fPIC)                echo -KPIC -xcode=pic32 ;;
            -W*,*)                echo $flag              ;;
            -f*-*|-W*|-mimpure-text)                      ;;
            -shared)              echo -G                 ;;
            *)                    echo $flag              ;;
        esac
    done
}

probe_cc(){
    pfx=$1
    _cc=$2
    first=$3

    unset _type _ident _cc_c _cc_e _cc_o _flags _cflags
    unset _ld_o _ldflags _ld_lib _ld_path
    unset _depflags _DEPCMD _DEPFLAGS
    _flags_filter=echo

    if $_cc --version 2>&1 | grep -q '^GNU assembler'; then
        true # no-op to avoid reading stdin in following checks
    elif $_cc -v 2>&1 | grep -q '^gcc.*LLVM'; then
        _type=llvm_gcc
        gcc_extra_ver=$(expr "$($_cc --version 2>/dev/null | head -n1)" : '.*\((.*)\)')
        _ident="llvm-gcc $($_cc -dumpversion 2>/dev/null) $gcc_extra_ver"
        _depflags='-MMD -MF $(@:.o=.d) -MT $@'
        _cflags_speed='-O3'
        _cflags_size='-Os'
    elif $_cc -v 2>&1 | grep -qi ^gcc; then
        _type=gcc
        gcc_version=$($_cc --version | head -n1)
        gcc_basever=$($_cc -dumpversion)
        gcc_pkg_ver=$(expr "$gcc_version" : '[^ ]* \(([^)]*)\)')
        gcc_ext_ver=$(expr "$gcc_version" : ".*$gcc_pkg_ver $gcc_basever \\(.*\\)")
        _ident=$(cleanws "gcc $gcc_basever $gcc_pkg_ver $gcc_ext_ver")
        case $gcc_basever in
            2) ;;
            2.*) ;;
            *) _depflags='-MMD -MF $(@:.o=.d) -MT $@' ;;
        esac
        if [ "$first" = true ]; then
            case $gcc_basever in
                4.2*)
                warn "gcc 4.2 is outdated and may miscompile FFmpeg. Please use a newer compiler." ;;
            esac
        fi
        _cflags_speed='-O3'
        _cflags_size='-Os'
    elif $_cc --version 2>/dev/null | grep -q ^icc; then
        _type=icc
        _ident=$($_cc --version | head -n1)
        _depflags='-MMD'
        _cflags_speed='-O3'
        _cflags_size='-Os'
        _cflags_noopt='-O1'
        _flags_filter=icc_flags
    elif $_cc -v 2>&1 | grep -q xlc; then
        _type=xlc
        _ident=$($_cc -qversion 2>/dev/null | head -n1)
        _cflags_speed='-O5'
        _cflags_size='-O5 -qcompact'
    elif $_cc --vsn 2>/dev/null | grep -Eq "ARM (C/C\+\+ )?Compiler"; then
        test -d "$sysroot" || die "No valid sysroot specified."
        _type=armcc
        _ident=$($_cc --vsn | grep -i build | head -n1 | sed 's/.*: //')
        armcc_conf="$PWD/armcc.conf"
        $_cc --arm_linux_configure                 \
             --arm_linux_config_file="$armcc_conf" \
             --configure_sysroot="$sysroot"        \
             --configure_cpp_headers="$sysinclude" >>$logfile 2>&1 ||
             die "Error creating armcc configuration file."
        $_cc --vsn | grep -q RVCT && armcc_opt=rvct || armcc_opt=armcc
        _flags="--arm_linux_config_file=$armcc_conf --translate_gcc"
        as_default="${cross_prefix}gcc"
        _depflags='-MMD'
        _cflags_speed='-O3'
        _cflags_size='-Os'
    elif $_cc -v 2>&1 | grep -q clang && ! $_cc -? > /dev/null 2>&1; then
        _type=clang
        _ident=$($_cc --version 2>/dev/null | head -n1)
        _depflags='-MMD -MF $(@:.o=.d) -MT $@'
        _cflags_speed='-O3'
        _cflags_size='-Oz'
    elif $_cc -V 2>&1 | grep -q Sun; then
        _type=suncc
        _ident=$($_cc -V 2>&1 | head -n1 | cut -d' ' -f 2-)
        _DEPCMD='$(DEP$(1)) $(DEP$(1)FLAGS) $($(1)DEP_FLAGS) $< | sed -e "1s,^.*: ,$@: ," -e "\$$!s,\$$, \\\," -e "1!s,^.*: , ," > $(@:.o=.d)'
        _DEPFLAGS='-xM1 -xc99'
        _ldflags='-std=c99'
        _cflags_speed='-O5'
        _cflags_size='-O5 -xspace'
        _flags_filter=suncc_flags
    elif $_cc -v 2>&1 | grep -q 'PathScale\|Path64'; then
        _type=pathscale
        _ident=$($_cc -v 2>&1 | head -n1 | tr -d :)
        _depflags='-MMD -MF $(@:.o=.d) -MT $@'
        _cflags_speed='-O2'
        _cflags_size='-Os'
        _flags_filter='filter_out -Wdisabled-optimization'
    elif $_cc -v 2>&1 | grep -q Open64; then
        _type=open64
        _ident=$($_cc -v 2>&1 | head -n1 | tr -d :)
        _depflags='-MMD -MF $(@:.o=.d) -MT $@'
        _cflags_speed='-O2'
        _cflags_size='-Os'
        _flags_filter='filter_out -Wdisabled-optimization|-Wtype-limits|-fno-signed-zeros'
    elif $_cc 2>&1 | grep -q 'Microsoft.*ARM.*Assembler'; then
        _type=armasm
        _ident=$($_cc | head -n1)
        # 4509: "This form of conditional instruction is deprecated"
        _flags="-nologo -ignore 4509"
        _flags_filter=armasm_flags
    elif $_cc 2>&1 | grep -q Intel; then
        _type=icl
        _ident=$($_cc 2>&1 | head -n1)
        _depflags='-QMMD -QMF$(@:.o=.d) -QMT$@'
        # Not only is O3 broken on 13.x+ but it is slower on all previous
        # versions (tested) as well.
        _cflags_speed="-O2"
        _cflags_size="-O1 -Oi" # -O1 without -Oi miscompiles stuff
        if $_cc 2>&1 | grep -q Linker; then
            _ld_o='-out:$@'
        else
            _ld_o='-Fe$@'
        fi
        _cc_o='-Fo$@'
        _cc_e='-P'
        _flags_filter=icl_flags
        _ld_lib='lib%.a'
        _ld_path='-libpath:'
        # -Qdiag-error to make icl error when seeing certain unknown arguments
        _flags='-nologo -Qdiag-error:4044,10157'
        # -Qvec- -Qsimd- to prevent miscompilation, -GS, fp:precise for consistency
        # with MSVC which enables it by default.
        _cflags='-Qms0 -Qvec- -Qsimd- -GS -fp:precise'
        disable stripping
    elif $_cc -? 2>/dev/null | grep -q 'LLVM.*Linker'; then
        # lld can emulate multiple different linkers; in ms link.exe mode,
        # the -? parameter gives the help output which contains an identifyable
        # string, while it gives an error in other modes.
        _type=lld-link
        # The link.exe mode doesn't have a switch for getting the version,
        # but we can force it back to gnu mode and get the version from there.
        _ident=$($_cc -flavor gnu --version 2>/dev/null)
        _ld_o='-out:$@'
        _flags_filter=msvc_flags
        _ld_lib='lib%.a'
        _ld_path='-libpath:'
    elif $_cc -nologo- 2>&1 | grep -q Microsoft || { $_cc -v 2>&1 | grep -q clang && $_cc -? > /dev/null 2>&1; }; then
        _type=msvc
        if $_cc -nologo- 2>&1 | grep -q Microsoft; then
            _ident=$($_cc 2>&1 | head -n1 | tr -d '\r')
        else
            _ident=$($_cc --version 2>/dev/null | head -n1 | tr -d '\r')
        fi
        _DEPCMD='$(DEP$(1)) $(DEP$(1)FLAGS) $($(1)DEP_FLAGS) $< 2>&1 | awk '\''/including/ { sub(/^.*file: */, ""); gsub(/\\/, "/"); if (!match($$0, / /)) print "$@:", $$0 }'\'' > $(@:.o=.d)'
        _DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -showIncludes -Zs'
        _cflags_speed="-O2"
        _cflags_size="-O1"
        _cflags_noopt="-O1"
        if $_cc -nologo- 2>&1 | grep -q Linker; then
            _ld_o='-out:$@'
        else
            _ld_o='-Fe$@'
        fi
        _cc_o='-Fo$@'
        _cc_e='-P -Fi$@'
        _flags_filter=msvc_flags
        _ld_lib='lib%.a'
        _ld_path='-libpath:'
        _flags='-nologo'
        disable stripping
    elif $_cc --version 2>/dev/null | grep -q ^cparser; then
        _type=cparser
        _ident=$($_cc --version | head -n1)
        _depflags='-MMD'
        _cflags_speed='-O4'
        _cflags_size='-O2'
        _flags_filter=cparser_flags
    fi

    eval ${pfx}_type=\$_type
    eval ${pfx}_ident=\$_ident
}

set_ccvars(){
    eval ${1}_C=\${_cc_c-\${${1}_C}}
    eval ${1}_E=\${_cc_e-\${${1}_E}}
    eval ${1}_O=\${_cc_o-\${${1}_O}}

    if [ -n "$_depflags" ]; then
        eval ${1}_DEPFLAGS=\$_depflags
    else
        eval ${1}DEP=\${_DEPCMD:-\$DEPCMD}
        eval ${1}DEP_FLAGS=\${_DEPFLAGS:-\$DEPFLAGS}
        eval DEP${1}FLAGS=\$_flags
    fi
}

probe_cc cc "$cc" "true"
cflags_filter=$_flags_filter
cflags_speed=$_cflags_speed
cflags_size=$_cflags_size
cflags_noopt=$_cflags_noopt
add_cflags $_flags $_cflags
cc_ldflags=$_ldflags
set_ccvars CC
set_ccvars CXX

probe_cc hostcc "$host_cc"
host_cflags_filter=$_flags_filter
host_cflags_speed=$_cflags_speed
add_host_cflags  $_flags $_cflags
set_ccvars HOSTCC

test -n "$cc_type" && enable $cc_type ||
    warn "Unknown C compiler $cc, unable to select optimal CFLAGS"

: ${as_default:=$cc}
: ${objcc_default:=$cc}
: ${dep_cc_default:=$cc}
: ${ld_default:=$cc}
: ${host_ld_default:=$host_cc}
set_default ar as objcc dep_cc ld ln_s host_ld windres

probe_cc as "$as"
asflags_filter=$_flags_filter
add_asflags $_flags $_cflags
set_ccvars AS

probe_cc objcc "$objcc"
objcflags_filter=$_flags_filter
add_objcflags $_flags $_cflags
set_ccvars OBJC

probe_cc ld "$ld"
ldflags_filter=$_flags_filter
add_ldflags $_flags $_ldflags
test "$cc_type" != "$ld_type" && add_ldflags $cc_ldflags
LD_O=${_ld_o-$LD_O}
LD_LIB=${_ld_lib-$LD_LIB}
LD_PATH=${_ld_path-$LD_PATH}

probe_cc hostld "$host_ld"
host_ldflags_filter=$_flags_filter
add_host_ldflags $_flags $_ldflags
HOSTLD_O=${_ld_o-$HOSTLD_O}

if [ -z "$CC_DEPFLAGS" ] && [ "$dep_cc" != "$cc" ]; then
    probe_cc depcc "$dep_cc"
    CCDEP=${_DEPCMD:-$DEPCMD}
    CCDEP_FLAGS=${_DEPFLAGS:=$DEPFLAGS}
    DEPCCFLAGS=$_flags
fi

if $ar 2>&1 | grep -q Microsoft; then
    arflags="-nologo"
    ar_o='-out:$@'
elif $ar 2>&1 | grep -q "\[D\] "; then
    arflags="rcD"
    ar_o='$@'
else
    arflags="rc"
    ar_o='$@'
fi

add_cflags $extra_cflags
add_cxxflags $extra_cxxflags
add_objcflags $extra_objcflags
add_asflags $extra_cflags

if test -n "$sysroot"; then
    case "$cc_type" in
        gcc|llvm_gcc|clang)
            add_cppflags --sysroot="$sysroot"
            add_ldflags --sysroot="$sysroot"
        ;;
    esac
fi

if test "$cpu" = host; then
    enabled cross_compile &&
        warn "--cpu=host makes no sense when cross-compiling."

    case "$cc_type" in
        gcc|llvm_gcc)
            check_native(){
                $cc $1=native -v -c -o $TMPO $TMPC >$TMPE 2>&1 || return
                sed -n "/cc1.*$1=/{
                            s/.*$1=\\([^ ]*\\).*/\\1/
                            p
                            q
                        }" $TMPE
            }
            cpu=$(check_native -march || check_native -mcpu)
        ;;
        clang)
            check_native(){
                $cc $1=native -v -c -o $TMPO $TMPC >$TMPE 2>&1 || return
                sed -n "/cc1.*-target-cpu /{
                            s/.*-target-cpu \\([^ ]*\\).*/\\1/
                            p
                            q
                        }" $TMPE
            }
            cpu=$(check_native -march)
        ;;
    esac

    test "${cpu:-host}" = host &&
        die "--cpu=host not supported with compiler $cc"
fi

# Deal with common $arch aliases
case "$arch" in
    aarch64|arm64)
        arch="aarch64"
    ;;
    arm*|iPad*|iPhone*)
        arch="arm"
    ;;
    loongarch*)
        arch="loongarch"
    ;;
    mips*|IP*)
        case "$arch" in
        *el)
            add_cppflags -EL
            add_ldflags -EL
        ;;
        *eb)
            add_cppflags -EB
            add_ldflags -EB
        ;;
        esac
        arch="mips"
    ;;
    parisc*|hppa*)
        arch="parisc"
    ;;
    "Power Macintosh"|ppc*|powerpc*)
        arch="ppc"
    ;;
    riscv*)
        arch="riscv"
    ;;
    s390|s390x)
        arch="s390"
    ;;
    sh4|sh)
        arch="sh4"
    ;;
    sun4*|sparc*)
        arch="sparc"
    ;;
    tilegx|tile-gx)
        arch="tilegx"
    ;;
    i[3-6]86*|i86pc|BePC|x86pc|x86_64|x86_32|amd64)
        arch="x86"
    ;;
esac

is_in $arch $ARCH_LIST || warn "unknown architecture $arch"
enable $arch

# Add processor-specific flags
if enabled aarch64; then

    case $cpu in
        armv*)
            cpuflags="-march=$cpu"
        ;;
        *)
            cpuflags="-mcpu=$cpu"
        ;;
    esac

elif enabled alpha; then

    cpuflags="-mcpu=$cpu"

elif enabled arm; then

    check_arm_arch() {
        test_cpp_condition stddef.h \
            "defined __ARM_ARCH_${1}__ || defined __TARGET_ARCH_${2:-$1}" \
            $cpuflags
    }

    probe_arm_arch() {
        if   check_arm_arch 4;        then echo armv4
        elif check_arm_arch 4T;       then echo armv4t
        elif check_arm_arch 5;        then echo armv5
        elif check_arm_arch 5E;       then echo armv5e
        elif check_arm_arch 5T;       then echo armv5t
        elif check_arm_arch 5TE;      then echo armv5te
        elif check_arm_arch 5TEJ;     then echo armv5te
        elif check_arm_arch 6;        then echo armv6
        elif check_arm_arch 6J;       then echo armv6j
        elif check_arm_arch 6K;       then echo armv6k
        elif check_arm_arch 6Z;       then echo armv6z
        elif check_arm_arch 6KZ;      then echo armv6zk
        elif check_arm_arch 6ZK;      then echo armv6zk
        elif check_arm_arch 6T2;      then echo armv6t2
        elif check_arm_arch 7;        then echo armv7
        elif check_arm_arch 7A  7_A;  then echo armv7-a
        elif check_arm_arch 7S;       then echo armv7-a
        elif check_arm_arch 7R  7_R;  then echo armv7-r
        elif check_arm_arch 7M  7_M;  then echo armv7-m
        elif check_arm_arch 7EM 7E_M; then echo armv7-m
        elif check_arm_arch 8A  8_A;  then echo armv8-a
        fi
    }


    case $cpu in
        generic)
            subarch=$(probe_arm_arch | sed 's/[^a-z0-9]//g')
        ;;
        armv*)
            cpuflags="-march=$cpu"
            subarch=$(echo $cpu | sed 's/[^a-z0-9]//g')
        ;;
        *)
            cpuflags="-mcpu=$cpu"
            case $cpu in
                cortex-a*)                               subarch=armv7a  ;;
                cortex-r*)                               subarch=armv7r  ;;
                cortex-m*)                 enable thumb; subarch=armv7m  ;;
                arm11*)                                  subarch=armv6   ;;
                arm[79]*e*|arm9[24]6*|arm96*|arm102[26]) subarch=armv5te ;;
                armv4*|arm7*|arm9[24]*)                  subarch=armv4   ;;
                *)                             subarch=$(probe_arm_arch) ;;
            esac
        ;;
    esac

    case "$subarch" in
        armv5t*)    enable fast_clz                ;;
        armv[6-8]*)
            enable fast_clz
            disabled fast_unaligned || enable fast_unaligned
            ;;
    esac

elif enabled avr32; then

    case $cpu in
        ap7[02]0[0-2])
            subarch="avr32_ap"
            cpuflags="-mpart=$cpu"
        ;;
        ap)
            subarch="avr32_ap"
            cpuflags="-march=$cpu"
        ;;
        uc3[ab]*)
            subarch="avr32_uc"
            cpuflags="-mcpu=$cpu"
        ;;
        uc)
            subarch="avr32_uc"
            cpuflags="-march=$cpu"
        ;;
    esac

elif enabled bfin; then

    cpuflags="-mcpu=$cpu"

elif enabled loongarch; then

    enable local_aligned
    enable simd_align_32
    enable fast_64bit
    enable fast_clz
    enable fast_unaligned
    case $cpu in
        la464)
            cpuflags="-march=$cpu"
        ;;
    esac
elif enabled mips; then

    if [ "$cpu" != "generic" ]; then
        disable mips32r2
        disable mips32r5
        disable mips64r2
        disable mips32r6
        disable mips64r6
        disable loongson2
        disable loongson3
        disable mipsdsp
        disable mipsdspr2

        cpuflags="-march=$cpu"

        case $cpu in
            # General ISA levels
            mips1|mips3)
            ;;
            mips32r2)
                enable mips32r2
            ;;
            mips32r5)
                enable mips32r2
                enable mips32r5
            ;;
            mips64r2|mips64r5)
                enable mips64r2
                enable loongson3
            ;;
            # Cores from MIPS(MTI)
            24kc)
                disable mipsfpu
                enable mips32r2
            ;;
            24kf*|24kec|34kc|74Kc|1004kc)
                enable mips32r2
            ;;
            24kef*|34kf*|1004kf*)
                enable mipsdsp
                enable mips32r2
            ;;
            p5600)
                enable mips32r2
                enable mips32r5
                check_cflags "-mtune=p5600" && check_cflags "-msched-weight -mload-store-pairs -funroll-loops"
            ;;
            i6400)
                enable mips64r6
                check_cflags "-mtune=i6400 -mabi=64" && check_cflags "-msched-weight -mload-store-pairs -funroll-loops" && check_ldflags "-mabi=64"
            ;;
            p6600)
                enable mips64r6
                check_cflags "-mtune=p6600 -mabi=64" && check_cflags "-msched-weight -mload-store-pairs -funroll-loops" && check_ldflags "-mabi=64"
            ;;
            # Cores from Loongson
            loongson2e|loongson2f|loongson3*)
                enable local_aligned
                enable simd_align_16
                enable fast_64bit
                enable fast_clz
                enable fast_cmov
                enable fast_unaligned
                disable aligned_stack
                # When gcc version less than 5.3.0, add -fno-expensive-optimizations flag.
                if test "$cc_type" = "gcc"; then
                    case $gcc_basever in
                        2|2.*|3.*|4.*|5.0|5.1|5.2)
                        expensive_optimization_flag="-fno-expensive-optimizations"
                        ;;
                        *)
                        expensive_optimization_flag=""
                        ;;
                    esac
                fi

                case $cpu in
                    loongson3*)
                        enable loongson3
                        cpuflags="-march=loongson3a -mhard-float $expensive_optimization_flag"
                    ;;
                    loongson2e)
                        enable loongson2
                        cpuflags="-march=loongson2e -mhard-float $expensive_optimization_flag"
                    ;;
                    loongson2f)
                        enable loongson2
                        cpuflags="-march=loongson2f -mhard-float $expensive_optimization_flag"
                    ;;
                esac
            ;;
            *)
                warn "unknown MIPS CPU"
            ;;
        esac

    else
        disable mipsdsp
        disable mipsdspr2
        # Disable DSP stuff for generic CPU, it can't be detected at runtime.
        warn 'generic cpu selected'
    fi

elif enabled ppc; then

    disable ldbrx

    case $(tolower $cpu) in
        601|ppc601|powerpc601)
            cpuflags="-mcpu=601"
            disable altivec
        ;;
        603*|ppc603*|powerpc603*)
            cpuflags="-mcpu=603"
            disable altivec
        ;;
        604*|ppc604*|powerpc604*)
            cpuflags="-mcpu=604"
            disable altivec
        ;;
        g3|75*|ppc75*|powerpc75*)
            cpuflags="-mcpu=750"
            disable altivec
        ;;
        g4|745*|ppc745*|powerpc745*)
            cpuflags="-mcpu=7450"
            disable vsx
        ;;
        74*|ppc74*|powerpc74*)
            cpuflags="-mcpu=7400"
            disable vsx
        ;;
        g5|970|ppc970|powerpc970)
            cpuflags="-mcpu=970"
            disable vsx
        ;;
        power[3-6]*)
            cpuflags="-mcpu=$cpu"
            disable vsx
        ;;
        power[7-8]*)
            cpuflags="-mcpu=$cpu"
        ;;
        cell)
            cpuflags="-mcpu=cell"
            enable ldbrx
            disable vsx
        ;;
        e500mc)
            cpuflags="-mcpu=e500mc"
            disable altivec
        ;;
        e500v2)
            cpuflags="-mcpu=8548 -mhard-float -mfloat-gprs=double"
            disable altivec
            disable dcbzl
        ;;
        e500)
            cpuflags="-mcpu=8540 -mhard-float"
            disable altivec
            disable dcbzl
        ;;
    esac

elif enabled sparc; then

    case $cpu in
        cypress|f93[04]|tsc701|sparcl*|supersparc|hypersparc|niagara|v[789])
            cpuflags="-mcpu=$cpu"
        ;;
        ultrasparc*|niagara[234])
            cpuflags="-mcpu=$cpu"
        ;;
    esac

elif enabled x86; then

    case $cpu in
        i[345]86|pentium)
            cpuflags="-march=$cpu"
            disable i686
            disable mmx
        ;;
        # targets that do NOT support nopl and conditional mov (cmov)
        pentium-mmx|k6|k6-[23]|winchip-c6|winchip2|c3)
            cpuflags="-march=$cpu"
            disable i686
        ;;
        # targets that do support nopl and conditional mov (cmov)
        i686|pentiumpro|pentium[23]|pentium-m|athlon|athlon-tbird|athlon-4|athlon-[mx]p|athlon64*|k8*|opteron*|athlon-fx\
        |core*|atom|bonnell|nehalem|westmere|silvermont|sandybridge|ivybridge|haswell|broadwell|skylake*|knl\
        |amdfam10|barcelona|b[dt]ver*|znver*)
            cpuflags="-march=$cpu"
            enable i686
            enable fast_cmov
        ;;
        # targets that do support conditional mov but on which it's slow
        pentium4|pentium4m|prescott|nocona)
            cpuflags="-march=$cpu"
            enable i686
            disable fast_cmov
        ;;
    esac

fi

if [ "$cpu" != generic ]; then
    add_cflags  $cpuflags
    add_asflags $cpuflags
    test "$cc_type" = "$ld_type" && add_ldflags $cpuflags
fi

# compiler sanity check
test_exec <<EOF
int main(void){ return 0; }
EOF
if test "$?" != 0; then
    echo "$cc is unable to create an executable file."
    if test -z "$cross_prefix" && ! enabled cross_compile ; then
        echo "If $cc is a cross-compiler, use the --enable-cross-compile option."
        echo "Only do this if you know what cross compiling means."
    fi
    die "C compiler test failed."
fi

add_cppflags -D_ISOC99_SOURCE
add_cxxflags -D__STDC_CONSTANT_MACROS
check_cxxflags -std=c++11 || check_cxxflags -std=c++0x

# some compilers silently accept -std=c11, so we also need to check that the
# version macro is defined properly
test_cflags_cc -std=c11 ctype.h "__STDC_VERSION__ >= 201112L" &&
    add_cflags -std=c11 ||
    check_cflags -std=c99

check_cppflags -D_FILE_OFFSET_BITS=64
check_cppflags -D_LARGEFILE_SOURCE

add_host_cppflags -D_ISOC99_SOURCE
check_host_cflags -std=c99
check_host_cflags -Wall
check_host_cflags $host_cflags_speed

check_64bit(){
    arch32=$1
    arch64=$2
    expr=${3:-'sizeof(void *) > 4'}
    test_code cc "" "int test[2*($expr) - 1]" &&
        subarch=$arch64 || subarch=$arch32
    enable $subarch
}

case "$arch" in
    aarch64|alpha|ia64)
        enabled shared && enable_weak pic
    ;;
    loongarch)
        check_64bit loongarch32 loongarch64
        enabled loongarch64 && disable loongarch32
        enabled shared && enable_weak pic
    ;;
    mips)
        check_64bit mips mips64 '_MIPS_SIM > 1'
        enabled shared && enable_weak pic
    ;;
    parisc)
        check_64bit parisc parisc64
        enabled shared && enable_weak pic
    ;;
    ppc)
        check_64bit ppc ppc64
        enabled shared && enable_weak pic
    ;;
    riscv)
        check_64bit riscv32 riscv64
        enabled shared && enable_weak pic
    ;;
    s390)
        check_64bit s390 s390x
        enabled shared && enable_weak pic
    ;;
    sparc)
        check_64bit sparc sparc64
        enabled shared && enable_weak pic
    ;;
    x86)
        check_64bit x86_32 x86_64
        # Treat x32 as x64 for now. Note it also needs pic if shared
        test "$subarch" = "x86_32" && test_cpp_condition stddef.h 'defined(__x86_64__)' &&
            subarch=x86_64 && enable x86_64 && disable x86_32
        if enabled x86_64; then
            enabled shared && enable_weak pic
            objformat=elf64
        fi
    ;;
esac

# OS specific
case $target_os in
    aix)
        SHFLAGS=-shared
        add_cppflags '-I\$(SRC_PATH)/compat/aix'
        enabled shared && add_ldflags -Wl,-brtl
        arflags='-Xany -r -c'
        striptype=""
        ;;
    android)
        disable symver
        enable section_data_rel_ro
        add_cflags -fPIE
        add_ldexeflags -fPIE -pie
        SLIB_INSTALL_NAME='$(SLIBNAME)'
        SLIB_INSTALL_LINKS=
        SHFLAGS='-shared -Wl,-soname,$(SLIBNAME)'
        ;;
    haiku)
        prefix_default="/boot/common"
        network_extralibs="-lnetwork"
        host_extralibs=
        ;;
    sunos)
        SHFLAGS='-shared -Wl,-h,$$(@F)'
        enabled x86 && append SHFLAGS -mimpure-text
        network_extralibs="-lsocket -lnsl"
        add_cppflags -D__EXTENSIONS__
        # When using suncc to build, the Solaris linker will mark
        # an executable with each instruction set encountered by
        # the Solaris assembler.  As our libraries contain their own
        # guards for processor-specific code, instead suppress
        # generation of the HWCAPS ELF section on Solaris x86 only.
        enabled_all suncc x86 &&
            echo "hwcap_1 = OVERRIDE;" > mapfile &&
            add_ldflags -Wl,-M,mapfile
        nm_default='nm -P -g'
        striptype=""
        version_script='-M'
        VERSION_SCRIPT_POSTPROCESS_CMD='perl $(SRC_PATH)/compat/solaris/make_sunver.pl - $(OBJS)'
        ;;
    netbsd)
        disable symver
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        enabled gcc || check_ldflags -Wl,-zmuldefs
        ;;
    openbsd|bitrig)
        disable symver
        enable section_data_rel_ro
        striptype=""
        SHFLAGS='-shared'
        SLIB_INSTALL_NAME='$(SLIBNAME).$(LIBMAJOR).$(LIBMINOR)'
        SLIB_INSTALL_LINKS=
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        ;;
    dragonfly)
        disable symver
        ;;
    freebsd)
        ;;
    bsd/os)
        add_extralibs -lpoll -lgnugetopt
        strip="strip -d"
        ;;
    darwin)
        enabled ppc && add_asflags -force_cpusubtype_ALL
        install_name_dir_default='$(SHLIBDIR)'
        SHFLAGS='-dynamiclib -Wl,-single_module -Wl,-install_name,$(INSTALL_NAME_DIR)/$(SLIBNAME_WITH_MAJOR),-current_version,$(LIBVERSION),-compatibility_version,$(LIBMAJOR)'
        enabled x86_32 && append SHFLAGS -Wl,-read_only_relocs,suppress
        strip="${strip} -x"
        add_ldflags -Wl,-dynamic,-search_paths_first
        check_cflags -Werror=partial-availability
        SLIBSUF=".dylib"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME).$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME).$(LIBMAJOR)$(SLIBSUF)'
        enabled x86_64 && objformat="macho64" || objformat="macho32"
        enabled_any pic shared x86_64 ||
            { check_cflags -mdynamic-no-pic && add_asflags -mdynamic-no-pic; }
        check_headers dispatch/dispatch.h &&
            add_cppflags '-I\$(SRC_PATH)/compat/dispatch_semaphore'
        if test -n "$sysroot"; then
            is_in -isysroot $cc $CPPFLAGS $CFLAGS || check_cppflags -isysroot $sysroot
            is_in -isysroot $ld $LDFLAGS          || check_ldflags  -isysroot $sysroot
        fi
        version_script='-exported_symbols_list'
        VERSION_SCRIPT_POSTPROCESS_CMD='tr " " "\n" | sed -n /global:/,/local:/p | grep ";" | tr ";" "\n" | sed -E "s/(.+)/_\1/g" | sed -E "s/(.+[^*])$$$$/\1*/"'
        # Workaround for Xcode 11 -fstack-check bug
        if enabled clang; then
            clang_version=$($cc -dumpversion)
            test ${clang_version%%.*} -eq 11 && add_cflags -fno-stack-check
        fi
        ;;
    msys*)
        die "Native MSYS builds are discouraged, please use the MINGW environment."
        ;;
    mingw32*|mingw64*)
        target_os=mingw32
        LIBTARGET=i386
        if enabled x86_64; then
            LIBTARGET="i386:x86-64"
        elif enabled arm; then
            LIBTARGET="arm"
        elif enabled aarch64; then
            LIBTARGET="arm64"
        fi
        if enabled shared; then
            # Cannot build both shared and static libs when using dllimport.
            disable static
        fi
        enabled shared && ! enabled small && test_cmd $windres --version && enable gnu_windres
        enabled x86_32 && check_ldflags -Wl,--large-address-aware
        shlibdir_default="$bindir_default"
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        if test_cmd lib.exe -list; then
            SLIB_EXTRA_CMD=-'lib.exe -nologo -machine:$(LIBTARGET) -def:$$(@:$(SLIBSUF)=.def) -out:$(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib)'
            if enabled x86_64; then
                LIBTARGET=x64
            fi
        else
            SLIB_EXTRA_CMD=-'$(DLLTOOL) -m $(LIBTARGET) -d $$(@:$(SLIBSUF)=.def) -l $(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib) -D $(SLIBNAME_WITH_MAJOR)'
        fi
        SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
        SLIB_INSTALL_LINKS=
        SLIB_INSTALL_EXTRA_SHLIB='$(SLIBNAME:$(SLIBSUF)=.lib)'
        SLIB_INSTALL_EXTRA_LIB='lib$(SLIBNAME:$(SLIBSUF)=.dll.a) $(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.def)'
        SLIB_CREATE_DEF_CMD='EXTERN_PREFIX="$(EXTERN_PREFIX)" AR="$(AR_CMD)" NM="$(NM_CMD)" $(SRC_PATH)/compat/windows/makedef $(SUBDIR)lib$(NAME).ver $(OBJS) > $$(@:$(SLIBSUF)=.def)'
        SHFLAGS='-shared -Wl,--out-implib,$(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) -Wl,--disable-auto-image-base $$(@:$(SLIBSUF)=.def)'
        enabled x86_64 && objformat="win64" || objformat="win32"
        dlltool="${cross_prefix}dlltool"
        ranlib=:
        enable dos_paths
        check_ldflags -Wl,--nxcompat,--dynamicbase
        # Lets work around some stupidity in binutils.
        # ld will strip relocations from executables even though we need them
        # for dynamicbase (ASLR).  Using -pie does retain the reloc section
        # however ld then forgets what the entry point should be (oops) so we
        # have to manually (re)set it.
        if enabled x86_32; then
            disabled debug && add_ldexeflags -Wl,--pic-executable,-e,_mainCRTStartup
        elif enabled x86_64; then
            disabled debug && add_ldexeflags -Wl,--pic-executable,-e,mainCRTStartup
            check_ldflags -Wl,--high-entropy-va # binutils 2.25
            # Set image base >4GB for extra entropy with HEASLR
            add_ldexeflags -Wl,--image-base,0x140000000
            append SHFLAGS -Wl,--image-base,0x180000000
        fi
        ;;
    win32|win64)
        disable symver
        if enabled shared; then
            # Link to the import library instead of the normal static library
            # for shared libs.
            LD_LIB='%.lib'
            # Cannot build both shared and static libs with MSVC or icl.
            disable static
        fi
        enabled x86_32 && check_ldflags -LARGEADDRESSAWARE
        shlibdir_default="$bindir_default"
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        SLIB_CREATE_DEF_CMD='EXTERN_PREFIX="$(EXTERN_PREFIX)" $(SRC_PATH)/compat/windows/makedef $(SUBDIR)lib$(NAME).ver $(OBJS) > $$(@:$(SLIBSUF)=.def)'
        SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
        SLIB_INSTALL_LINKS=
        SLIB_INSTALL_EXTRA_SHLIB='$(SLIBNAME:$(SLIBSUF)=.lib)'
        SLIB_INSTALL_EXTRA_LIB='$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.def)'
        SHFLAGS='-dll -def:$$(@:$(SLIBSUF)=.def) -implib:$(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib)'
        enabled x86_64 && objformat="win64" || objformat="win32"
        ranlib=:
        enable dos_paths
        ;;
    cygwin*)
        target_os=cygwin
        shlibdir_default="$bindir_default"
        SLIBPREF="cyg"
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
        SLIB_INSTALL_LINKS=
        SLIB_INSTALL_EXTRA_LIB='lib$(FULLNAME).dll.a'
        SHFLAGS='-shared -Wl,--out-implib,$(SUBDIR)lib$(FULLNAME).dll.a'
        enabled x86_64 && objformat="win64" || objformat="win32"
        enable dos_paths
        enabled shared && ! enabled small && test_cmd $windres --version && enable gnu_windres
        add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
        ;;
    *-dos|freedos|opendos)
        network_extralibs="-lsocket"
        objformat="coff"
        enable dos_paths
        ;;
    linux)
        enable section_data_rel_ro
        enabled_any arm aarch64 && enable_weak linux_perf
        ;;
    irix*)
        target_os=irix
        ranlib="echo ignoring ranlib"
        ;;
    os/2*)
        strip="lxlite -CS"
        striptype=""
        objformat="aout"
        add_cppflags -D_GNU_SOURCE
        add_ldflags -Zomf -Zbin-files -Zargs-wild -Zhigh-mem -Zmap
        SHFLAGS='$(SUBDIR)$(NAME).def -Zdll -Zomf'
        LIBSUF="_s.a"
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(shell echo $(FULLNAME) | cut -c1-6)$(LIBMAJOR)$(SLIBSUF)'
        SLIB_CREATE_DEF_CMD='echo LIBRARY $(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=) INITINSTANCE TERMINSTANCE > $(SUBDIR)$(FULLNAME).def; \
            echo CODE PRELOAD MOVEABLE DISCARDABLE >> $(SUBDIR)$(FULLNAME).def; \
            echo DATA PRELOAD MOVEABLE MULTIPLE NONSHARED >> $(SUBDIR)$(FULLNAME).def; \
            echo EXPORTS >> $(SUBDIR)$(FULLNAME).def; \
            emxexp $(OBJS) >> $(SUBDIR)$(FULLNAME).def'
        SLIB_EXTRA_CMD='emximp -o $(SUBDIR)$(LIBPREF)$(FULLNAME)_dll.a $(SUBDIR)$(FULLNAME).def; \
            emximp -o $(SUBDIR)$(LIBPREF)$(FULLNAME)_dll.lib $(SUBDIR)$(FULLNAME).def;'
        SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
        SLIB_INSTALL_LINKS=
        SLIB_INSTALL_EXTRA_LIB='$(LIBPREF)$(FULLNAME)_dll.a $(LIBPREF)$(FULLNAME)_dll.lib'
        enable dos_paths
        enable_weak os2threads
        ;;
    gnu/kfreebsd)
        add_cppflags -D_BSD_SOURCE
        ;;
    gnu)
        ;;
    qnx)
        add_cppflags -D_QNX_SOURCE
        network_extralibs="-lsocket"
        ;;
    symbian)
        SLIBSUF=".dll"
        enable dos_paths
        add_cflags --include=$sysinclude/gcce/gcce.h -fvisibility=default
        add_cppflags -D__GCCE__ -D__SYMBIAN32__ -DSYMBIAN_OE_POSIX_SIGNALS
        add_ldflags -Wl,--target1-abs,--no-undefined \
                    -Wl,-Ttext,0x80000,-Tdata,0x1000000 -shared \
                    -Wl,--entry=_E32Startup -Wl,-u,_E32Startup
        add_extralibs -l:eexe.lib -l:usrt2_2.lib -l:dfpaeabi.dso \
                      -l:drtaeabi.dso -l:scppnwdl.dso -lsupc++ -lgcc \
                      -l:libc.dso -l:libm.dso -l:euser.dso -l:libcrt0.lib
        ;;
    minix)
        ;;
    none)
        ;;
    *)
        die "Unknown OS '$target_os'."
        ;;
esac

# test if creating links works
link_dest=$(mktemp -u $TMPDIR/dest_XXXXXXXX)
link_name=$(mktemp -u $TMPDIR/name_XXXXXXXX)
mkdir "$link_dest"
$ln_s "$link_dest" "$link_name"
touch "$link_dest/test_file"
if [ "$source_path" != "." ] && [ "$source_path" != "src" ] && ([ ! -d src ] || [ -L src ]) && [ -e "$link_name/test_file" ]; then
    # create link to source path
    [ -e src ] && rm src
    $ln_s "$source_path" src
    source_link=src
else
    # creating directory links doesn't work
    # fall back to using the full source path
    source_link="$source_path"
fi
# cleanup
rm -r "$link_dest"
rm -r "$link_name"

# determine libc flavour

probe_libc(){
    pfx=$1
    pfx_no_=${pfx%_}
    # uclibc defines __GLIBC__, so it needs to be checked before glibc.
    if test_${pfx}cpp_condition features.h "defined __UCLIBC__"; then
        eval ${pfx}libc_type=uclibc
        add_${pfx}cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
    elif test_${pfx}cpp_condition features.h "defined __GLIBC__"; then
        eval ${pfx}libc_type=glibc
        add_${pfx}cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
    # MinGW headers can be installed on Cygwin, so check for newlib first.
    elif test_${pfx}cpp_condition newlib.h "defined _NEWLIB_VERSION"; then
        eval ${pfx}libc_type=newlib
        add_${pfx}cppflags -U__STRICT_ANSI__ -D_XOPEN_SOURCE=600
    # MinGW64 is backwards compatible with MinGW32, so check for it first.
    elif test_${pfx}cpp_condition _mingw.h "defined __MINGW64_VERSION_MAJOR"; then
        eval ${pfx}libc_type=mingw64
        if test_${pfx}cpp_condition _mingw.h "__MINGW64_VERSION_MAJOR < 3"; then
            add_compat msvcrt/snprintf.o
            add_cflags "-include $source_path/compat/msvcrt/snprintf.h"
        fi
        add_${pfx}cppflags -U__STRICT_ANSI__ -D__USE_MINGW_ANSI_STDIO=1
        eval test \$${pfx_no_}cc_type = "gcc" &&
            add_${pfx}cppflags -D__printf__=__gnu_printf__
        test_${pfx}cpp_condition windows.h "!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600" &&
            add_${pfx}cppflags -D_WIN32_WINNT=0x0600
        add_${pfx}cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
    elif test_${pfx}cpp_condition _mingw.h "defined __MINGW_VERSION"  ||
         test_${pfx}cpp_condition _mingw.h "defined __MINGW32_VERSION"; then
        eval ${pfx}libc_type=mingw32
        test_${pfx}cpp_condition _mingw.h "__MINGW32_MAJOR_VERSION > 3 || \
            (__MINGW32_MAJOR_VERSION == 3 && __MINGW32_MINOR_VERSION >= 15)" ||
            die "ERROR: MinGW32 runtime version must be >= 3.15."
        add_${pfx}cppflags -U__STRICT_ANSI__ -D__USE_MINGW_ANSI_STDIO=1
        test_${pfx}cpp_condition _mingw.h "__MSVCRT_VERSION__ < 0x0700" &&
            add_${pfx}cppflags -D__MSVCRT_VERSION__=0x0700
        test_${pfx}cpp_condition windows.h "!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600" &&
            add_${pfx}cppflags -D_WIN32_WINNT=0x0600
        eval test \$${pfx_no_}cc_type = "gcc" &&
            add_${pfx}cppflags -D__printf__=__gnu_printf__
        add_${pfx}cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
    elif test_${pfx}cpp_condition crtversion.h "defined _VC_CRT_MAJOR_VERSION"; then
        eval ${pfx}libc_type=msvcrt
        if test_${pfx}cpp_condition crtversion.h "_VC_CRT_MAJOR_VERSION < 14"; then
            if [ "$pfx" = host_ ]; then
                add_host_cppflags -Dsnprintf=_snprintf
            else
                add_compat strtod.o strtod=avpriv_strtod
                add_compat msvcrt/snprintf.o snprintf=avpriv_snprintf   \
                                             _snprintf=avpriv_snprintf  \
                                             vsnprintf=avpriv_vsnprintf
            fi
        fi
        add_${pfx}cppflags -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS
        # The MSVC 2010 headers (Win 7.0 SDK) set _WIN32_WINNT to
        # 0x601 by default unless something else is set by the user.
        # This can easily lead to us detecting functions only present
        # in such new versions and producing binaries requiring windows 7.0.
        # Therefore explicitly set the default to Vista unless the user has
        # set something else on the command line.
        # Don't do this if WINAPI_FAMILY is set and is set to a non-desktop
        # family. For these cases, configure is free to use any functions
        # found in the SDK headers by default. (Alternatively, we could force
        # _WIN32_WINNT to 0x0602 in that case.)
        test_${pfx}cpp_condition stdlib.h "defined(_WIN32_WINNT)" ||
            { test_${pfx}cpp <<EOF && add_${pfx}cppflags -D_WIN32_WINNT=0x0600; }
#ifdef WINAPI_FAMILY
#include <winapifamily.h>
#if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#error not desktop
#endif
#endif
EOF
        if [ "$pfx" = "" ]; then
            check_func strtoll || add_cflags -Dstrtoll=_strtoi64
            check_func strtoull || add_cflags -Dstrtoull=_strtoui64
        fi
    elif test_${pfx}cpp_condition stddef.h "defined __KLIBC__"; then
        eval ${pfx}libc_type=klibc
    elif test_${pfx}cpp_condition sys/cdefs.h "defined __BIONIC__"; then
        eval ${pfx}libc_type=bionic
    elif test_${pfx}cpp_condition sys/brand.h "defined LABELED_BRAND_NAME"; then
        eval ${pfx}libc_type=solaris
        add_${pfx}cppflags -D__EXTENSIONS__ -D_XOPEN_SOURCE=600
    elif test_${pfx}cpp_condition sys/version.h "defined __DJGPP__"; then
        eval ${pfx}libc_type=djgpp
        add_cppflags -U__STRICT_ANSI__
        add_cflags "-include $source_path/compat/djgpp/math.h"
        add_compat djgpp/math.o
    fi
    test_${pfx}cc <<EOF
#include <time.h>
void *v = localtime_r;
EOF
test "$?" != 0 && test_${pfx}cc -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 <<EOF && add_${pfx}cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600
#include <time.h>
void *v = localtime_r;
EOF

    eval test -n "\${${pfx}libc_type}" && enable ${pfx}libc_${libc_type}
}

probe_libc
probe_libc host_

# hacks for compiler/libc/os combinations

case $libc_type in
    bionic)
        add_compat strtod.o strtod=avpriv_strtod
        ;;
esac

check_compile_assert flt_lim "float.h limits.h" "DBL_MAX == (double)DBL_MAX" ||
    add_cppflags '-I\$(SRC_PATH)/compat/float'

test_cpp_condition stdlib.h "defined(__PIC__) || defined(__pic__) || defined(PIC)" && enable_weak pic

set_default libdir
: ${shlibdir_default:="$libdir"}
: ${pkgconfigdir_default:="$libdir/pkgconfig"}

set_default $PATHS_LIST
set_default nm

disabled optimizations || enabled ossfuzz || check_cflags -fomit-frame-pointer

enable_weak_pic() {
    disabled pic && return
    enable pic
    add_cppflags -DPIC
    case "$target_os" in
    mingw*|cygwin*|win*)
        ;;
    *)
        add_cflags -fPIC
        add_asflags -fPIC
        ;;
    esac
}

enabled pic && enable_weak_pic

test_cc <<EOF || die "Symbol mangling check failed."
int ff_extern;
EOF
sym=$($nm $TMPO | awk '/ff_extern/{ print substr($0, match($0, /[^ \t]*ff_extern/)) }')
extern_prefix=${sym%%ff_extern*}

! disabled inline_asm && check_inline_asm inline_asm '"" ::'

for restrict_keyword in restrict __restrict__ __restrict ""; do
    test_code cc "" "char * $restrict_keyword p" && break
done

check_cc pragma_deprecated "" '_Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")'

# The global variable ensures the bits appear unchanged in the object file.
test_cc <<EOF || die "endian test failed"
unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
EOF
od -t x1 $TMPO | grep -q '42 *49 *47 *45' && enable bigendian

check_cc const_nan math.h "struct { double d; } static const bar[] = { { NAN } }"

if ! enabled ppc64 || enabled bigendian; then
    disable vsx
fi

check_gas() {
    log "check_gas using '$as' as AS"
    # :vararg is used on aarch64, arm and ppc altivec
    check_as vararg "
.macro m n, y:vararg=0
\n: .int \y
.endm
m x" || return 1
    # .altmacro is only used in arm asm
    ! enabled arm || check_as gnu_as ".altmacro"
}

if enabled_any arm aarch64 || enabled_all ppc altivec && enabled asm; then
    nogas=:
    enabled_any arm aarch64 && nogas=die
    enabled_all ppc altivec && [ $target_os_default != aix ] && nogas=warn
    as_noop=-v

    case $as_type in
        arm*) gaspp_as_type=armasm; as_noop=-h ;;
        gcc)  gaspp_as_type=gas ;;
        *)    gaspp_as_type=$as_type ;;
    esac

    [ $target_os = "darwin" ] && gaspp_as_type="apple-$gaspp_as_type"

    test "${as#*gas-preprocessor.pl}" != "$as" ||
    test_cmd gas-preprocessor.pl -arch $arch -as-type $gaspp_as_type -- ${as:=$cc} $as_noop &&
        gas="${gas:=gas-preprocessor.pl} -arch $arch -as-type $gaspp_as_type -- ${as:=$cc}"

    if ! check_gas ; then
        as=${gas:=$as}
        check_gas || \
            $nogas "GNU assembler not found, install/update gas-preprocessor"
    fi

    check_as as_func ".func test
                      .endfunc"
fi

check_inline_asm inline_asm_labels '"1:\n"'

check_inline_asm inline_asm_nonlocal_labels '"Label:\n"'

if enabled aarch64; then
    enabled armv8 && check_insn armv8 'prfm   pldl1strm, [x0]'
    # internal assembler in clang 3.3 does not support this instruction
    enabled neon && check_insn neon 'ext   v0.8B, v0.8B, v1.8B, #1'
    enabled vfp  && check_insn vfp  'fmadd d0,    d0,    d1,    d2'

    map 'enabled_any ${v}_external ${v}_inline || disable $v' $ARCH_EXT_LIST_ARM

elif enabled alpha; then

    check_cflags -mieee

elif enabled arm; then

    enabled msvc && check_cpp_condition thumb stddef.h "defined _M_ARMT"
    test_cpp_condition stddef.h "defined __thumb__" && test_cc <<EOF && enable_weak thumb
float func(float a, float b){ return a+b; }
EOF
    enabled thumb && check_cflags -mthumb || check_cflags -marm

    if check_cpp_condition vfp_args stddef.h "defined __ARM_PCS_VFP"; then
        :
    elif check_cpp_condition vfp_args stddef.h "defined _M_ARM_FP && _M_ARM_FP >= 30"; then
        :
    elif ! test_cpp_condition stddef.h "defined __ARM_PCS || defined __SOFTFP__" && [ $target_os != darwin ]; then
        case "${cross_prefix:-$cc}" in
            *hardfloat*) enable vfp_args; fpabi=vfp ;;
            *) check_ld "cc" vfp_args <<EOF && fpabi=vfp || fpabi=soft ;;
__asm__ (".eabi_attribute 28, 1");
int main(void) { return 0; }
EOF
        esac
        warn "Compiler does not indicate floating-point ABI, guessing $fpabi."
    fi

    enabled armv5te && check_insn armv5te 'qadd r0, r0, r0'
    enabled armv6   && check_insn armv6   'sadd16 r0, r0, r0'
    enabled armv6t2 && check_insn armv6t2 'movt r0, #0'
    enabled neon    && check_insn neon    'vadd.i16 q0, q0, q0'
    enabled vfp     && check_insn vfp     'fadds s0, s0, s0'
    enabled vfpv3   && check_insn vfpv3   'vmov.f32 s0, #1.0'
    enabled setend  && check_insn setend  'setend be'

    [ $target_os = linux ] || [ $target_os = android ] ||
        map 'enabled_any ${v}_external ${v}_inline || disable $v' \
            $ARCH_EXT_LIST_ARM

    check_inline_asm asm_mod_q '"add r0, %Q0, %R0" :: "r"((long long)0)'

    check_as as_arch_directive ".arch armv7-a"
    check_as as_dn_directive   "ra .dn d0.i16"
    check_as as_fpu_directive  ".fpu neon"

    # llvm's integrated assembler supports .object_arch from llvm 3.5
    [ "$objformat" = elf32 ] || [ "$objformat" = elf64 ] &&
        check_as as_object_arch ".object_arch armv4"

    # MS armasm fails to assemble our PIC constructs
    [ $target_os != win32 ] && enabled_all armv6t2 shared !pic && enable_weak_pic

elif enabled mips; then

    # Check toolchain ISA level
    if enabled mips64; then
        enabled mips64r6 && check_inline_asm mips64r6 '"dlsa $0, $0, $0, 1"' &&
            disable mips64r2

        enabled mips64r2 && check_inline_asm mips64r2 '"dext $0, $0, 0, 1"'

        disable mips32r6 && disable mips32r5 && disable mips32r2
    else
        enabled mips32r6 && check_inline_asm mips32r6 '"aui $0, $0, 0"' &&
            disable mips32r5 && disable mips32r2

        enabled mips32r5 && check_inline_asm mips32r5 '"eretnc"'
        enabled mips32r2 && check_inline_asm mips32r2 '"ext $0, $0, 0, 1"'

        disable mips64r6 && disable mips64r5 && disable mips64r2
    fi

    enabled mipsfpu && check_inline_asm mipsfpu '"cvt.d.l $f0, $f2"'
    enabled mipsfpu && (enabled mips32r5 || enabled mips32r6 || enabled mips64r6) && check_inline_asm_flags mipsfpu '"cvt.d.l $f0, $f1"' '-mfp64'

    enabled mipsdsp && check_inline_asm_flags mipsdsp '"addu.qb $t0, $t1, $t2"' '-mdsp'
    enabled mipsdspr2 && check_inline_asm_flags mipsdspr2 '"absq_s.qb $t0, $t1"' '-mdspr2'

    # MSA can be detected at runtime so we supply extra flags here
    enabled mipsfpu && enabled msa && check_inline_asm msa '"addvi.b $w0, $w1, 1"' '-mmsa' && append MSAFLAGS '-mmsa'

    # loongson2 have no switch cflag so we can only probe toolchain ability
    enabled loongson2 && check_inline_asm loongson2 '"dmult.g $8, $9, $10"' && disable loongson3

    # loongson3 is paired with MMI
    enabled loongson3 && check_inline_asm loongson3 '"gsldxc1 $f0, 0($2, $3)"' '-mloongson-ext' && append MMIFLAGS '-mloongson-ext'

    # MMI can be detected at runtime too
    enabled mmi && check_inline_asm mmi '"pxor $f0, $f0, $f0"' '-mloongson-mmi' && append MMIFLAGS '-mloongson-mmi'

    if enabled bigendian && enabled msa; then
        disable msa
    fi

elif enabled parisc; then

    if enabled gcc; then
        case $($cc -dumpversion) in
            4.[3-9].*) check_cflags -fno-optimize-sibling-calls ;;
        esac
    fi

elif enabled ppc; then

    enable local_aligned

    check_inline_asm dcbzl     '"dcbzl 0, %0" :: "r"(0)'
    check_inline_asm ibm_asm   '"add 0, 0, 0"'
    check_inline_asm ppc4xx    '"maclhw r10, r11, r12"'
    check_inline_asm xform_asm '"lwzx %1, %y0" :: "Z"(*(int*)0), "r"(0)'

    if enabled altivec; then
        check_cflags -maltivec -mabi=altivec

        # check if our compiler supports Motorola AltiVec C API
        check_cc altivec altivec.h "vector signed int v1 = (vector signed int) { 0 };
                                    vector signed int v2 = (vector signed int) { 1 };
                                    v1 = vec_add(v1, v2);"

        enabled altivec || warn "Altivec disabled, possibly missing --cpu flag"
    fi

    if enabled vsx; then
        check_cflags -mvsx &&
        check_cc vsx altivec.h "int v[4] = { 0 };
                                vector signed int v1 = vec_vsx_ld(0, v);"
    fi

    if enabled power8; then
        check_cpp_condition power8 "altivec.h" "defined(_ARCH_PWR8)"
    fi

elif enabled x86; then

    check_builtin rdtsc    intrin.h   "__rdtsc()"
    check_builtin mm_empty mmintrin.h "_mm_empty()"

    enable local_aligned

    # check whether EBP is available on x86
    # As 'i' is stored on the stack, this program will crash
    # if the base pointer is used to access it because the
    # base pointer is cleared in the inline assembly code.
    check_exec_crash <<EOF && enable ebp_available
volatile int i=0;
__asm__ volatile ("xorl %%ebp, %%ebp" ::: "%ebp");
return i;
EOF

    # check whether EBX is available on x86
    check_inline_asm ebx_available '""::"b"(0)' &&
        check_inline_asm ebx_available '"":::"%ebx"'

    # check whether xmm clobbers are supported
    check_inline_asm xmm_clobbers '"":::"%xmm0"'

    check_inline_asm inline_asm_direct_symbol_refs '"movl '$extern_prefix'test, %eax"' ||
        check_inline_asm inline_asm_direct_symbol_refs '"movl '$extern_prefix'test(%rip), %eax"'

    # check whether binutils is new enough to compile SSSE3/MMXEXT
    enabled ssse3  && check_inline_asm ssse3_inline  '"pabsw %xmm0, %xmm0"'
    enabled mmxext && check_inline_asm mmxext_inline '"pmaxub %mm0, %mm1"'

    probe_x86asm(){
        x86asmexe_probe=$1
        if test_cmd $x86asmexe_probe -v; then
            x86asmexe=$x86asmexe_probe
            x86asm_type=nasm
            x86asm_debug="-g -F dwarf"
            X86ASMDEP=
            X86ASM_DEPFLAGS='-MD $(@:.o=.d)'
        elif test_cmd $x86asmexe_probe --version; then
            x86asmexe=$x86asmexe_probe
            x86asm_type=yasm
            x86asm_debug="-g dwarf2"
            X86ASMDEP='$(DEPX86ASM) $(X86ASMFLAGS) -M $(X86ASM_O) $< > $(@:.o=.d)'
            X86ASM_DEPFLAGS=
        fi
        check_x86asm x86asm "movbe ecx, [5]"
    }

    if ! disabled_any asm mmx x86asm; then
        disable x86asm
        for program in $x86asmexe nasm yasm; do
            probe_x86asm $program && break
        done
        disabled x86asm && die "nasm/yasm not found or too old. Use --disable-x86asm for a crippled build."
        X86ASMFLAGS="-f $objformat"
        enabled pic               && append X86ASMFLAGS "-DPIC"
        test -n "$extern_prefix"  && append X86ASMFLAGS "-DPREFIX"
        case "$objformat" in
            elf*) enabled debug && append X86ASMFLAGS $x86asm_debug ;;
        esac

        enabled avx512 && check_x86asm avx512_external "vmovdqa32 [eax]{k1}{z}, zmm0"
        enabled avx2   && check_x86asm avx2_external   "vextracti128 xmm0, ymm0, 0"
        enabled xop    && check_x86asm xop_external    "vpmacsdd xmm0, xmm1, xmm2, xmm3"
        enabled fma4   && check_x86asm fma4_external   "vfmaddps ymm0, ymm1, ymm2, ymm3"
        check_x86asm cpunop          "CPU amdnop"
    fi

    case "$cpu" in
        athlon*|opteron*|k8*|pentium|pentium-mmx|prescott|nocona|atom|geode)
            disable fast_clz
        ;;
    esac

elif enabled loongarch; then
    enabled lsx && check_inline_asm lsx '"vadd.b $vr0, $vr1, $vr2"' '-mlsx' && append LSXFLAGS '-mlsx'
    enabled lasx && check_inline_asm lasx '"xvadd.b $xr0, $xr1, $xr2"' '-mlasx' && append LASXFLAGS '-mlasx'
fi

check_cc intrinsics_neon arm_neon.h "int16x8_t test = vdupq_n_s16(0)"

check_ldflags -Wl,--as-needed
check_ldflags -Wl,-z,noexecstack

if ! disabled network; then
    check_func getaddrinfo $network_extralibs
    check_func inet_aton $network_extralibs

    check_type netdb.h "struct addrinfo"
    check_type netinet/in.h "struct group_source_req" -D_BSD_SOURCE
    check_type netinet/in.h "struct ip_mreq_source" -D_BSD_SOURCE
    check_type netinet/in.h "struct ipv6_mreq" -D_DARWIN_C_SOURCE
    check_type poll.h "struct pollfd"
    check_type netinet/sctp.h "struct sctp_event_subscribe"
    check_struct "sys/socket.h" "struct msghdr" msg_flags
    check_struct "sys/types.h sys/socket.h" "struct sockaddr" sa_len
    check_type netinet/in.h "struct sockaddr_in6"
    check_type "sys/types.h sys/socket.h" "struct sockaddr_storage"
    check_type "sys/types.h sys/socket.h" socklen_t

    # Prefer arpa/inet.h over winsock2
    if check_headers arpa/inet.h ; then
        check_func closesocket
    elif check_headers winsock2.h ; then
        check_func_headers winsock2.h closesocket -lws2 &&
            network_extralibs="-lws2" ||
        { check_func_headers winsock2.h closesocket -lws2_32 &&
            network_extralibs="-lws2_32"; } || disable winsock2_h network
        check_func_headers ws2tcpip.h getaddrinfo $network_extralibs

        check_type ws2tcpip.h socklen_t
        check_type ws2tcpip.h "struct addrinfo"
        check_type ws2tcpip.h "struct group_source_req"
        check_type ws2tcpip.h "struct ip_mreq_source"
        check_type ws2tcpip.h "struct ipv6_mreq"
        check_type winsock2.h "struct pollfd"
        check_struct winsock2.h "struct sockaddr" sa_len
        check_type ws2tcpip.h "struct sockaddr_in6"
        check_type ws2tcpip.h "struct sockaddr_storage"
    else
        disable network
    fi
fi

check_builtin atomic_cas_ptr atomic.h "void **ptr; void *oldval, *newval; atomic_cas_ptr(ptr, oldval, newval)"
check_builtin machine_rw_barrier mbarrier.h "__machine_rw_barrier()"
check_builtin MemoryBarrier windows.h "MemoryBarrier()"
check_builtin sync_val_compare_and_swap "" "int *ptr; int oldval, newval; __sync_val_compare_and_swap(ptr, oldval, newval)"
check_builtin gmtime_r time.h "time_t *time; struct tm *tm; gmtime_r(time, tm)"
check_builtin localtime_r time.h "time_t *time; struct tm *tm; localtime_r(time, tm)"

case "$custom_allocator" in
    jemalloc)
        # jemalloc by default does not use a prefix
        require libjemalloc jemalloc/jemalloc.h malloc -ljemalloc
    ;;
    tcmalloc)
        require_pkg_config libtcmalloc libtcmalloc gperftools/tcmalloc.h tc_malloc
        malloc_prefix=tc_
    ;;
esac

check_func_headers malloc.h _aligned_malloc     && enable aligned_malloc
check_func  ${malloc_prefix}memalign            && enable memalign
check_func  ${malloc_prefix}posix_memalign      && enable posix_memalign

check_func  access
check_func_headers stdlib.h arc4random
check_lib   clock_gettime time.h clock_gettime || check_lib clock_gettime time.h clock_gettime -lrt
check_func  fcntl
check_func  fork
check_func  gethrtime
check_func  getopt
check_func  getrusage
check_func  gettimeofday
check_func  isatty
check_func  mkstemp
check_func  mmap
check_func  mprotect
# Solaris has nanosleep in -lrt, OpenSolaris no longer needs that
check_func_headers time.h nanosleep || check_lib nanosleep time.h nanosleep -lrt
check_func  sched_getaffinity
check_func  setrlimit
check_struct "sys/stat.h" "struct stat" st_mtim.tv_nsec -D_BSD_SOURCE
check_func  strerror_r
check_func  sysconf
check_func  sysctl
check_func  usleep

check_func_headers conio.h kbhit
check_func_headers io.h setmode
check_func_headers lzo/lzo1x.h lzo1x_999_compress
check_func_headers mach/mach_time.h mach_absolute_time
check_func_headers stdlib.h getenv
check_func_headers sys/stat.h lstat

check_func_headers windows.h GetModuleHandle
check_func_headers windows.h GetProcessAffinityMask
check_func_headers windows.h GetProcessTimes
check_func_headers windows.h GetStdHandle
check_func_headers windows.h GetSystemTimeAsFileTime
check_func_headers windows.h LoadLibrary
check_func_headers windows.h MapViewOfFile
check_func_headers windows.h PeekNamedPipe
check_func_headers windows.h SetConsoleTextAttribute
check_func_headers windows.h SetConsoleCtrlHandler
check_func_headers windows.h SetDllDirectory
check_func_headers windows.h Sleep
check_func_headers windows.h VirtualAlloc
check_func_headers glob.h glob

if enabled xlib; then
    check_pkg_config xlib_x11 x11 "X11/Xlib.h" XPending ||
    check_lib xlib_x11 "X11/Xlib.h" XPending -lX11 ||
        disable xlib

    check_pkg_config xlib_xext xext "X11/Xlib.h X11/extensions/XShm.h" XShmAttach ||
    check_lib xlib_xext "X11/Xlib.h X11/extensions/XShm.h" XShmAttach -lXext ||
        disable xlib

    check_pkg_config xlib_xv xv "X11/Xlib.h X11/extensions/Xvlib.h" XvGetPortAttribute ||
    check_lib xlib_xv "X11/Xlib.h X11/extensions/Xvlib.h" XvGetPortAttribute -lXv ||
        disable xlib
fi

check_headers direct.h
check_headers dirent.h
check_headers dxgidebug.h
check_headers dxva.h
check_headers dxva2api.h -D_WIN32_WINNT=0x0600
check_headers io.h
enabled libdrm &&
    check_headers linux/dma-buf.h

check_headers linux/perf_event.h
check_headers libcrystalhd/libcrystalhd_if.h
check_headers malloc.h
check_headers mftransform.h
check_headers net/udplite.h
check_headers poll.h
check_headers sys/param.h
check_headers sys/resource.h
check_headers sys/select.h
check_headers sys/time.h
check_headers sys/un.h
check_headers termios.h
check_headers unistd.h
check_headers valgrind/valgrind.h
check_func_headers VideoToolbox/VTCompressionSession.h VTCompressionSessionPrepareToEncodeFrames -framework VideoToolbox
check_headers windows.h
check_headers X11/extensions/XvMClib.h
check_headers asm/types.h

# it seems there are versions of clang in some distros that try to use the
# gcc headers, which explodes for stdatomic
# so we also check that atomics actually work here
check_builtin stdatomic stdatomic.h "atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0); foo += bar"

check_lib advapi32 "windows.h"            RegCloseKey          -ladvapi32
check_lib bcrypt   "windows.h bcrypt.h"   BCryptGenRandom      -lbcrypt &&
    check_cpp_condition bcrypt bcrypt.h "defined BCRYPT_RNG_ALGORITHM"
check_lib ole32    "windows.h"            CoTaskMemFree        -lole32
check_lib shell32  "windows.h shellapi.h" CommandLineToArgvW   -lshell32
check_lib psapi    "windows.h psapi.h"    GetProcessMemoryInfo -lpsapi

check_lib android android/native_window.h ANativeWindow_acquire -landroid
check_lib mediandk "stdint.h media/NdkImage.h" AImage_delete -lmediandk
check_lib camera2ndk "stdbool.h stdint.h camera/NdkCameraManager.h" ACameraManager_create -lcamera2ndk

enabled appkit       && check_apple_framework AppKit
enabled audiotoolbox && check_apple_framework AudioToolbox
enabled avfoundation && check_apple_framework AVFoundation
enabled coreimage    && check_apple_framework CoreImage
enabled metal        && check_apple_framework Metal
enabled videotoolbox && check_apple_framework VideoToolbox

check_apple_framework CoreFoundation
check_apple_framework CoreMedia
check_apple_framework CoreVideo
check_apple_framework CoreAudio

enabled avfoundation && {
    disable coregraphics applicationservices
    check_lib coregraphics        CoreGraphics/CoreGraphics.h               CGGetActiveDisplayList "-framework CoreGraphics" ||
    check_lib applicationservices ApplicationServices/ApplicationServices.h CGGetActiveDisplayList "-framework ApplicationServices"; }

enabled videotoolbox && {
    check_lib coreservices CoreServices/CoreServices.h UTGetOSTypeFromString "-framework CoreServices"
    check_func_headers CoreMedia/CMFormatDescription.h kCMVideoCodecType_HEVC "-framework CoreMedia"
    check_func_headers CoreMedia/CMFormatDescription.h kCMVideoCodecType_HEVCWithAlpha "-framework CoreMedia"
    check_func_headers CoreMedia/CMFormatDescription.h kCMVideoCodecType_VP9 "-framework CoreMedia"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_422YpCbCr8BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_422YpCbCr10BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_422YpCbCr16BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_444YpCbCr8BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVPixelBuffer.h kCVPixelFormatType_444YpCbCr16BiPlanarVideoRange "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferTransferFunction_ITU_R_2100_HLG "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferTransferFunction_Linear "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferYCbCrMatrix_ITU_R_2020 "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferColorPrimaries_ITU_R_2020 "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferTransferFunction_ITU_R_2020 "-framework CoreVideo"
    check_func_headers CoreVideo/CVImageBuffer.h kCVImageBufferTransferFunction_SMPTE_ST_428_1 "-framework CoreVideo"
}

enabled metal && test_cmd $metalcc -v || disable metal

check_struct "sys/time.h sys/resource.h" "struct rusage" ru_maxrss

check_type "windows.h dxva.h" "DXVA_PicParams_AV1" -DWINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP -D_CRT_BUILD_DESKTOP_APP=0
check_type "windows.h dxva.h" "DXVA_PicParams_HEVC" -DWINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP -D_CRT_BUILD_DESKTOP_APP=0
check_type "windows.h dxva.h" "DXVA_PicParams_VP9" -DWINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP -D_CRT_BUILD_DESKTOP_APP=0
check_type "windows.h d3d11.h" "ID3D11VideoDecoder"
check_type "windows.h d3d11.h" "ID3D11VideoContext"
check_type "d3d9.h dxva2api.h" DXVA2_ConfigPictureDecode -D_WIN32_WINNT=0x0602
check_func_headers mfapi.h MFCreateAlignedMemoryBuffer -lmfplat

check_type "vdpau/vdpau.h" "VdpPictureInfoHEVC"
check_type "vdpau/vdpau.h" "VdpPictureInfoVP9"

if [ -z "$nvccflags" ]; then
    nvccflags=$nvccflags_default
fi

nvccflags="$nvccflags -std=c++11"

if enabled x86_64 || enabled ppc64 || enabled aarch64; then
    nvccflags="$nvccflags -m64"
else
    nvccflags="$nvccflags -m32"
fi

if enabled cuda_nvcc; then
    nvccflags="$nvccflags -ptx"
else
    nvccflags="$nvccflags -S -nocudalib -nocudainc --cuda-device-only -Wno-c++11-narrowing -include ${source_link}/compat/cuda/cuda_runtime.h"
    check_nvcc cuda_llvm
fi

if ! disabled ffnvcodec; then
    ffnv_hdr_list="ffnvcodec/nvEncodeAPI.h ffnvcodec/dynlink_cuda.h ffnvcodec/dynlink_cuviddec.h ffnvcodec/dynlink_nvcuvid.h"
    check_pkg_config ffnvcodec "ffnvcodec >= 9.1.23.1" "$ffnv_hdr_list" "" || \
      check_pkg_config ffnvcodec "ffnvcodec >= 9.0.18.3 ffnvcodec < 9.1" "$ffnv_hdr_list" "" || \
      check_pkg_config ffnvcodec "ffnvcodec >= 8.2.15.10 ffnvcodec < 8.3" "$ffnv_hdr_list" "" || \
      check_pkg_config ffnvcodec "ffnvcodec >= 8.1.24.11 ffnvcodec < 8.2" "$ffnv_hdr_list" ""
fi

if enabled_all libglslang libshaderc; then
    die "ERROR: libshaderc and libglslang are mutually exclusive, if in doubt, disable libglslang"
fi

check_cpp_condition winrt windows.h "!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)"

if ! disabled w32threads && ! enabled pthreads; then
    check_func_headers "windows.h process.h" _beginthreadex &&
        check_type "windows.h" CONDITION_VARIABLE &&
        check_type "windows.h" INIT_ONCE &&
        enable w32threads || disable w32threads
    if ! enabled w32threads && enabled winrt; then
        check_func_headers "windows.h" CreateThread &&
            enable w32threads || disable w32threads
    fi
fi

# check for some common methods of building with pthread support
# do this before the optional library checks as some of them require pthreads
if ! disabled pthreads && ! enabled w32threads && ! enabled os2threads; then
    if check_lib pthreads pthread.h pthread_join   -pthread &&
       check_lib pthreads pthread.h pthread_create -pthread; then
        add_cflags -pthread
    elif check_lib pthreads pthread.h pthread_join   -pthreads &&
         check_lib pthreads pthread.h pthread_create -pthreads; then
        add_cflags -pthreads
    elif check_lib pthreads pthread.h pthread_join   -ldl -pthread &&
         check_lib pthreads pthread.h pthread_create -ldl -pthread; then
        add_cflags -ldl -pthread
    elif check_lib pthreads pthread.h pthread_join   -lpthreadGC2 &&
         check_lib pthreads pthread.h pthread_create -lpthreadGC2; then
        :
    elif check_lib pthreads pthread.h pthread_join   -lpthread &&
         check_lib pthreads pthread.h pthread_create -lpthread; then
        :
    elif check_func pthread_join && check_func pthread_create; then
        enable pthreads
    fi
    check_cc pthreads "pthread.h" "static pthread_mutex_t atomic_lock = PTHREAD_MUTEX_INITIALIZER"

    if enabled pthreads; then
        check_builtin sem_timedwait semaphore.h "sem_t *s; sem_init(s,0,0); sem_timedwait(s,0); sem_destroy(s)" $pthreads_extralibs
        check_func pthread_cancel $pthreads_extralibs
    fi
fi

enabled  zlib && { check_pkg_config zlib zlib "zlib.h" zlibVersion ||
                   check_lib zlib   zlib.h      zlibVersion    -lz; }
enabled bzlib && check_lib bzlib bzlib.h BZ2_bzlibVersion    -lbz2
enabled  lzma && check_lib lzma   lzma.h lzma_version_number -llzma

enabled zlib && test_exec $zlib_extralibs <<EOF && enable zlib_gzip
#include <zlib.h>
int main(void) {
    if (zlibCompileFlags() & (1 << 17)) return 1;
    return 0;
}
EOF

[ -x "$(command -v gzip)" ] && enable gzip

enabled zlib_gzip && enabled gzip || disable ptx_compression

# On some systems dynamic loading requires no extra linker flags
check_lib libdl dlfcn.h "dlopen dlsym" || check_lib libdl dlfcn.h "dlopen dlsym" -ldl

check_lib libm math.h sin -lm

atan2f_args=2
copysign_args=2
hypot_args=2
ldexpf_args=2
powf_args=2

for func in $MATH_FUNCS; do
    eval check_mathfunc $func \${${func}_args:-1} $libm_extralibs
done

for func in $COMPLEX_FUNCS; do
    eval check_complexfunc $func \${${func}_args:-1}
done

# these are off by default, so fail if requested and not available
enabled avisynth          && require_headers "avisynth/avisynth_c.h"
enabled cuda_nvcc         && { check_nvcc cuda_nvcc || die "ERROR: failed checking for nvcc."; }
enabled chromaprint       && require chromaprint chromaprint.h chromaprint_get_version -lchromaprint
enabled decklink          && { require_headers DeckLinkAPI.h &&
                               { test_cpp_condition DeckLinkAPIVersion.h "BLACKMAGIC_DECKLINK_API_VERSION >= 0x0a0b0000" || die "ERROR: Decklink API version must be >= 10.11"; } }
enabled frei0r            && require_headers "frei0r.h"
enabled gmp               && require gmp gmp.h mpz_export -lgmp
enabled gnutls            && require_pkg_config gnutls gnutls gnutls/gnutls.h gnutls_global_init
enabled jni               && { [ $target_os = "android" ] && check_headers jni.h && enabled pthreads || die "ERROR: jni not found"; }
enabled ladspa            && require_headers "ladspa.h dlfcn.h"
enabled libaom            && require_pkg_config libaom "aom >= 1.0.0" aom/aom_codec.h aom_codec_version
enabled libaribb24        && { check_pkg_config libaribb24 "aribb24 > 1.0.3" "aribb24/aribb24.h" arib_instance_new ||
                               { enabled gpl && require_pkg_config libaribb24 aribb24 "aribb24/aribb24.h" arib_instance_new; } ||
                               die "ERROR: libaribb24 requires version higher than 1.0.3 or --enable-gpl."; }
enabled lv2               && require_pkg_config lv2 lilv-0 "lilv/lilv.h" lilv_world_new
enabled libiec61883       && require libiec61883 libiec61883/iec61883.h iec61883_cmp_connect -lraw1394 -lavc1394 -lrom1394 -liec61883
enabled libass            && require_pkg_config libass "libass >= 0.11.0" ass/ass.h ass_library_init
enabled libbluray         && require_pkg_config libbluray libbluray libbluray/bluray.h bd_open
enabled libbs2b           && require_pkg_config libbs2b libbs2b bs2b.h bs2b_open
enabled libcelt           && require libcelt celt/celt.h celt_decode -lcelt0 &&
                             { check_lib libcelt celt/celt.h celt_decoder_create_custom -lcelt0 ||
                               die "ERROR: libcelt must be installed and version must be >= 0.11.0."; }
enabled libcaca           && require_pkg_config libcaca caca caca.h caca_create_canvas
enabled libcodec2         && require libcodec2 codec2/codec2.h codec2_create -lcodec2
enabled libdav1d          && require_pkg_config libdav1d "dav1d >= 0.5.0" "dav1d/dav1d.h" dav1d_version
enabled libdavs2          && require_pkg_config libdavs2 "davs2 >= 1.6.0" davs2.h davs2_decoder_open
enabled libdc1394         && require_pkg_config libdc1394 libdc1394-2 dc1394/dc1394.h dc1394_new
enabled libdrm            && require_pkg_config libdrm libdrm xf86drm.h drmGetVersion
enabled libfdk_aac        && { check_pkg_config libfdk_aac fdk-aac "fdk-aac/aacenc_lib.h" aacEncOpen ||
                               { require libfdk_aac fdk-aac/aacenc_lib.h aacEncOpen -lfdk-aac &&
                                 warn "using libfdk without pkg-config"; } }
flite_extralibs="-lflite_cmu_time_awb -lflite_cmu_us_awb -lflite_cmu_us_kal -lflite_cmu_us_kal16 -lflite_cmu_us_rms -lflite_cmu_us_slt -lflite_usenglish -lflite_cmulex -lflite"
enabled libflite          && require libflite "flite/flite.h" flite_init $flite_extralibs
enabled fontconfig        && enable libfontconfig
enabled libfontconfig     && require_pkg_config libfontconfig fontconfig "fontconfig/fontconfig.h" FcInit
enabled libfreetype       && require_pkg_config libfreetype freetype2 "ft2build.h FT_FREETYPE_H" FT_Init_FreeType
enabled libfribidi        && require_pkg_config libfribidi fribidi fribidi.h fribidi_version_info
enabled libglslang && { check_lib spirv_compiler glslang/Include/glslang_c_interface.h glslang_initialize_process \
                            -lglslang -lMachineIndependent -lOSDependent -lHLSL -lOGLCompiler -lGenericCodeGen \
                            -lSPVRemapper -lSPIRV -lSPIRV-Tools-opt -lSPIRV-Tools -lpthread -lstdc++ -lm ||
                        require spirv_compiler glslang/Include/glslang_c_interface.h glslang_initialize_process \
                            -lglslang -lOSDependent -lHLSL -lOGLCompiler \
                            -lSPVRemapper -lSPIRV -lSPIRV-Tools-opt -lSPIRV-Tools -lpthread -lstdc++ -lm; }
enabled libgme            && { check_pkg_config libgme libgme gme/gme.h gme_new_emu ||
                               require libgme gme/gme.h gme_new_emu -lgme -lstdc++; }
enabled libgsm            && { for gsm_hdr in "gsm.h" "gsm/gsm.h"; do
                                   check_lib libgsm "${gsm_hdr}" gsm_create -lgsm && break;
                               done || die "ERROR: libgsm not found"; }
enabled libilbc           && require libilbc ilbc.h WebRtcIlbcfix_InitDecode -lilbc $pthreads_extralibs
enabled libklvanc         && require libklvanc libklvanc/vanc.h klvanc_context_create -lklvanc
enabled libkvazaar        && require_pkg_config libkvazaar "kvazaar >= 0.8.1" kvazaar.h kvz_api_get
enabled liblensfun        && require_pkg_config liblensfun lensfun lensfun.h lf_db_new
# While it may appear that require is being used as a pkg-config
# fallback for libmfx, it is actually being used to detect a different
# installation route altogether.  If libmfx is installed via the Intel
# Media SDK or Intel Media Server Studio, these don't come with
# pkg-config support.  Instead, users should make sure that the build
# can find the libraries and headers through other means.
enabled libmfx            && { check_pkg_config libmfx libmfx "mfx/mfxvideo.h" MFXInit ||
                               { require libmfx "mfx/mfxvideo.h" MFXInit "-llibmfx $advapi32_extralibs" && warn "using libmfx without pkg-config"; } }
if enabled libmfx; then
   check_cc MFX_CODEC_VP9 "mfx/mfxvp9.h mfx/mfxstructures.h" "MFX_CODEC_VP9"
fi

enabled libmodplug        && require_pkg_config libmodplug libmodplug libmodplug/modplug.h ModPlug_Load
enabled libmp3lame        && require "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame $libm_extralibs
enabled libmysofa         && { check_pkg_config libmysofa libmysofa mysofa.h mysofa_neighborhood_init_withstepdefine ||
                               require libmysofa mysofa.h mysofa_neighborhood_init_withstepdefine -lmysofa $zlib_extralibs; }
enabled libnpp            && { check_lib libnpp npp.h nppGetLibVersion -lnppig -lnppicc -lnppc -lnppidei -lnppif ||
                               check_lib libnpp npp.h nppGetLibVersion -lnppi -lnppif -lnppc -lnppidei ||
                               die "ERROR: libnpp not found"; }
enabled libopencore_amrnb && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb
enabled libopencore_amrwb && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb
enabled libopencv         && { check_headers opencv2/core/core_c.h &&
                               { check_pkg_config libopencv opencv opencv2/core/core_c.h cvCreateImageHeader ||
                                 require libopencv opencv2/core/core_c.h cvCreateImageHeader -lopencv_core -lopencv_imgproc; } ||
                               require_pkg_config libopencv opencv opencv/cxcore.h cvCreateImageHeader; }
enabled libopenh264       && require_pkg_config libopenh264 openh264 wels/codec_api.h WelsGetCodecVersion
enabled libopenjpeg       && { check_pkg_config libopenjpeg "libopenjp2 >= 2.1.0" openjpeg.h opj_version ||
                               { require_pkg_config libopenjpeg "libopenjp2 >= 2.1.0" openjpeg.h opj_version -DOPJ_STATIC && add_cppflags -DOPJ_STATIC; } }
enabled libopenmpt        && require_pkg_config libopenmpt "libopenmpt >= 0.2.6557" libopenmpt/libopenmpt.h openmpt_module_create -lstdc++ && append libopenmpt_extralibs "-lstdc++"
enabled libopenvino       && require libopenvino c_api/ie_c_api.h ie_c_api_version -linference_engine_c_api
enabled libopus           && {
    enabled libopus_decoder && {
        require_pkg_config libopus opus opus_multistream.h opus_multistream_decoder_create
    }
    enabled libopus_encoder && {
        require_pkg_config libopus opus opus_multistream.h opus_multistream_surround_encoder_create
    }
}
enabled libplacebo        && require_pkg_config libplacebo "libplacebo >= 4.192.0" libplacebo/vulkan.h pl_vulkan_create
enabled libpulse          && require_pkg_config libpulse libpulse pulse/pulseaudio.h pa_context_new
enabled librabbitmq       && require_pkg_config librabbitmq "librabbitmq >= 0.7.1" amqp.h amqp_new_connection
enabled librav1e          && require_pkg_config librav1e "rav1e >= 0.4.0" rav1e.h rav1e_context_new
enabled librist           && require_pkg_config librist "librist >= 0.2" librist/librist.h rist_receiver_create
enabled librsvg           && require_pkg_config librsvg librsvg-2.0 librsvg-2.0/librsvg/rsvg.h rsvg_handle_render_cairo
enabled librtmp           && require_pkg_config librtmp librtmp librtmp/rtmp.h RTMP_Socket
enabled librubberband     && require_pkg_config librubberband "rubberband >= 1.8.1" rubberband/rubberband-c.h rubberband_new -lstdc++ && append librubberband_extralibs "-lstdc++"
enabled libshaderc        && require_pkg_config spirv_compiler "shaderc >= 2019.1" shaderc/shaderc.h shaderc_compiler_initialize
enabled libshine          && require_pkg_config libshine shine shine/layer3.h shine_encode_buffer
enabled libsmbclient      && { check_pkg_config libsmbclient smbclient libsmbclient.h smbc_init ||
                               require libsmbclient libsmbclient.h smbc_init -lsmbclient; }
enabled libsnappy         && require libsnappy snappy-c.h snappy_compress -lsnappy -lstdc++
enabled libsoxr           && require libsoxr soxr.h soxr_create -lsoxr
enabled libssh            && require_pkg_config libssh libssh libssh/sftp.h sftp_init
enabled libspeex          && require_pkg_config libspeex speex speex/speex.h speex_decoder_init
enabled libsrt            && require_pkg_config libsrt "srt >= 1.3.0" srt/srt.h srt_socket
enabled libsvtav1         && require_pkg_config libsvtav1 "SvtAv1Enc >= 0.8.4" EbSvtAv1Enc.h svt_av1_enc_init_handle
enabled libtensorflow     && require libtensorflow tensorflow/c/c_api.h TF_Version -ltensorflow
enabled libtesseract      && require_pkg_config libtesseract tesseract tesseract/capi.h TessBaseAPICreate
enabled libtheora         && require libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
enabled libtls            && require_pkg_config libtls libtls tls.h tls_configure
enabled libtwolame        && require libtwolame twolame.h twolame_init -ltwolame &&
                             { check_lib libtwolame twolame.h twolame_encode_buffer_float32_interleaved -ltwolame ||
                               die "ERROR: libtwolame must be installed and version must be >= 0.3.10"; }
enabled libuavs3d         && require_pkg_config libuavs3d "uavs3d >= 1.1.41" uavs3d.h uavs3d_decode
enabled libv4l2           && require_pkg_config libv4l2 libv4l2 libv4l2.h v4l2_ioctl
enabled libvidstab        && require_pkg_config libvidstab "vidstab >= 0.98" vid.stab/libvidstab.h vsMotionDetectInit
enabled libvmaf           && require_pkg_config libvmaf "libvmaf >= 1.5.2" libvmaf.h compute_vmaf
enabled libvo_amrwbenc    && require libvo_amrwbenc vo-amrwbenc/enc_if.h E_IF_init -lvo-amrwbenc
enabled libvorbis         && require_pkg_config libvorbis vorbis vorbis/codec.h vorbis_info_init &&
                             require_pkg_config libvorbisenc vorbisenc vorbis/vorbisenc.h vorbis_encode_init

enabled libvpx            && {
    enabled libvpx_vp8_decoder && {
        check_pkg_config libvpx_vp8_decoder "vpx >= 1.4.0" "vpx/vpx_decoder.h vpx/vp8dx.h" vpx_codec_vp8_dx ||
            check_lib libvpx_vp8_decoder "vpx/vpx_decoder.h vpx/vp8dx.h" "vpx_codec_vp8_dx VPX_IMG_FMT_HIGHBITDEPTH" "-lvpx $libm_extralibs $pthreads_extralibs"
    }
    enabled libvpx_vp8_encoder && {
        check_pkg_config libvpx_vp8_encoder "vpx >= 1.4.0" "vpx/vpx_encoder.h vpx/vp8cx.h" vpx_codec_vp8_cx ||
            check_lib libvpx_vp8_encoder "vpx/vpx_encoder.h vpx/vp8cx.h" "vpx_codec_vp8_cx VPX_IMG_FMT_HIGHBITDEPTH" "-lvpx $libm_extralibs $pthreads_extralibs"
    }
    enabled libvpx_vp9_decoder && {
        check_pkg_config libvpx_vp9_decoder "vpx >= 1.4.0" "vpx/vpx_decoder.h vpx/vp8dx.h" vpx_codec_vp9_dx ||
            check_lib libvpx_vp9_decoder "vpx/vpx_decoder.h vpx/vp8dx.h" "vpx_codec_vp9_dx VPX_IMG_FMT_HIGHBITDEPTH" "-lvpx $libm_extralibs $pthreads_extralibs"
    }
    enabled libvpx_vp9_encoder && {
        check_pkg_config libvpx_vp9_encoder "vpx >= 1.4.0" "vpx/vpx_encoder.h vpx/vp8cx.h" vpx_codec_vp9_cx ||
            check_lib libvpx_vp9_encoder "vpx/vpx_encoder.h vpx/vp8cx.h" "vpx_codec_vp9_cx VPX_IMG_FMT_HIGHBITDEPTH" "-lvpx $libm_extralibs $pthreads_extralibs"
    }
    if disabled_all libvpx_vp8_decoder libvpx_vp9_decoder libvpx_vp8_encoder libvpx_vp9_encoder; then
        die "libvpx enabled but no supported decoders found"
    fi
}

enabled libwebp           && {
    enabled libwebp_encoder      && require_pkg_config libwebp "libwebp >= 0.2.0" webp/encode.h WebPGetEncoderVersion
    enabled libwebp_anim_encoder && check_pkg_config libwebp_anim_encoder "libwebpmux >= 0.4.0" webp/mux.h WebPAnimEncoderOptionsInit; }
enabled libx264           && { check_pkg_config libx264 x264 "stdint.h x264.h" x264_encoder_encode ||
                               { require libx264 "stdint.h x264.h" x264_encoder_encode "-lx264 $pthreads_extralibs $libm_extralibs" &&
                                 warn "using libx264 without pkg-config"; } } &&
                             require_cpp_condition libx264 x264.h "X264_BUILD >= 118" &&
                             check_cpp_condition libx262 x264.h "X264_MPEG2"
enabled libx265           && require_pkg_config libx265 x265 x265.h x265_api_get &&
                             require_cpp_condition libx265 x265.h "X265_BUILD >= 70"
enabled libxavs           && require libxavs "stdint.h xavs.h" xavs_encoder_encode "-lxavs $pthreads_extralibs $libm_extralibs"
enabled libxavs2          && require_pkg_config libxavs2 "xavs2 >= 1.3.0" "stdint.h xavs2.h" xavs2_api_get
enabled libxvid           && require libxvid xvid.h xvid_global -lxvidcore
enabled libzimg           && require_pkg_config libzimg "zimg >= 2.7.0" zimg.h zimg_get_api_version
enabled libzmq            && require_pkg_config libzmq "libzmq >= 4.2.1" zmq.h zmq_ctx_new
enabled libzvbi           && require_pkg_config libzvbi zvbi-0.2 libzvbi.h vbi_decoder_new &&
                             { test_cpp_condition libzvbi.h "VBI_VERSION_MAJOR > 0 || VBI_VERSION_MINOR > 2 || VBI_VERSION_MINOR == 2 && VBI_VERSION_MICRO >= 28" ||
                               enabled gpl || die "ERROR: libzvbi requires version 0.2.28 or --enable-gpl."; }
enabled libxml2           && require_pkg_config libxml2 libxml-2.0 libxml2/libxml/xmlversion.h xmlCheckVersion
enabled mbedtls           && { check_pkg_config mbedtls mbedtls mbedtls/x509_crt.h mbedtls_x509_crt_init ||
                               check_pkg_config mbedtls mbedtls mbedtls/ssl.h mbedtls_ssl_init ||
                               check_lib mbedtls mbedtls/ssl.h mbedtls_ssl_init -lmbedtls -lmbedx509 -lmbedcrypto ||
                               die "ERROR: mbedTLS not found"; }
enabled mediacodec        && { enabled jni || die "ERROR: mediacodec requires --enable-jni"; }
enabled mmal              && { check_lib mmal interface/mmal/mmal.h mmal_port_connect -lmmal_core -lmmal_util -lmmal_vc_client -lbcm_host ||
                               { ! enabled cross_compile &&
                                 add_cflags -isystem/opt/vc/include/ -isystem/opt/vc/include/interface/vmcs_host/linux -isystem/opt/vc/include/interface/vcos/pthreads -fgnu89-inline &&
                                 add_ldflags -L/opt/vc/lib/ &&
                                 check_lib mmal interface/mmal/mmal.h mmal_port_connect -lmmal_core -lmmal_util -lmmal_vc_client -lbcm_host; } ||
                               die "ERROR: mmal not found" &&
                               check_func_headers interface/mmal/mmal.h "MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS"; }
enabled openal            && { { for al_extralibs in "${OPENAL_LIBS}" "-lopenal" "-lOpenAL32"; do
                               check_lib openal 'AL/al.h' alGetError "${al_extralibs}" && break; done } ||
                               die "ERROR: openal not found"; } &&
                             { test_cpp_condition "AL/al.h" "defined(AL_VERSION_1_1)" ||
                               die "ERROR: openal must be installed and version must be 1.1 or compatible"; }
enabled opencl            && { check_pkg_config opencl OpenCL CL/cl.h clEnqueueNDRangeKernel ||
                               check_lib opencl OpenCL/cl.h clEnqueueNDRangeKernel -Wl,-framework,OpenCL ||
                               check_lib opencl CL/cl.h clEnqueueNDRangeKernel -lOpenCL ||
                               die "ERROR: opencl not found"; } &&
                             { test_cpp_condition "OpenCL/cl.h" "defined(CL_VERSION_1_2)" ||
                               test_cpp_condition "CL/cl.h" "defined(CL_VERSION_1_2)" ||
                               die "ERROR: opencl must be installed and version must be 1.2 or compatible"; }
enabled opengl            && { check_lib opengl GL/glx.h glXGetProcAddress "-lGL" ||
                               check_lib opengl windows.h wglGetProcAddress "-lopengl32 -lgdi32" ||
                               check_lib opengl OpenGL/gl3.h glGetError "-Wl,-framework,OpenGL" ||
                               check_lib opengl ES2/gl.h glGetError "-isysroot=${sysroot} -Wl,-framework,OpenGLES" ||
                               die "ERROR: opengl not found."
                             }
enabled omx_rpi           && { test_code cc OMX_Core.h OMX_IndexConfigBrcmVideoRequestIFrame ||
                               { ! enabled cross_compile &&
                                 add_cflags -isystem/opt/vc/include/IL &&
                                 test_code cc OMX_Core.h OMX_IndexConfigBrcmVideoRequestIFrame; } ||
                               die "ERROR: OpenMAX IL headers from raspberrypi/firmware not found"; } &&
                             enable omx
enabled omx               && require_headers OMX_Core.h
enabled openssl           && { { check_pkg_config openssl "openssl >= 3.0.0" openssl/ssl.h OPENSSL_init_ssl &&
                                 { enabled gplv3 || ! enabled gpl || enabled nonfree || die "ERROR: OpenSSL >=3.0.0 requires --enable-version3"; }; } ||
                               { enabled gpl && ! enabled nonfree && die "ERROR: OpenSSL <3.0.0 is incompatible with the gpl"; } ||
                               check_pkg_config openssl openssl openssl/ssl.h OPENSSL_init_ssl ||
                               check_pkg_config openssl openssl openssl/ssl.h SSL_library_init ||
                               check_lib openssl openssl/ssl.h OPENSSL_init_ssl -lssl -lcrypto ||
                               check_lib openssl openssl/ssl.h SSL_library_init -lssl -lcrypto ||
                               check_lib openssl openssl/ssl.h SSL_library_init -lssl32 -leay32 ||
                               check_lib openssl openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||
                               die "ERROR: openssl not found"; }
enabled pocketsphinx      && require_pkg_config pocketsphinx pocketsphinx pocketsphinx/pocketsphinx.h ps_init
enabled rkmpp             && { require_pkg_config rkmpp rockchip_mpp  rockchip/rk_mpi.h mpp_create &&
                               require_pkg_config rockchip_mpp "rockchip_mpp >= 1.3.7" rockchip/rk_mpi.h mpp_create &&
                               { enabled libdrm ||
                                 die "ERROR: rkmpp requires --enable-libdrm"; }
                             }
enabled vapoursynth       && require_pkg_config vapoursynth "vapoursynth-script >= 42" VSScript.h vsscript_init


if enabled gcrypt; then
    GCRYPT_CONFIG="${cross_prefix}libgcrypt-config"
    if "${GCRYPT_CONFIG}" --version > /dev/null 2>&1; then
        gcrypt_cflags=$("${GCRYPT_CONFIG}" --cflags)
        gcrypt_extralibs=$("${GCRYPT_CONFIG}" --libs)
        check_func_headers gcrypt.h gcry_mpi_new $gcrypt_cflags $gcrypt_extralibs ||
            die "ERROR: gcrypt not found"
        add_cflags $gcrypt_cflags
    else
        require gcrypt gcrypt.h gcry_mpi_new -lgcrypt
    fi
fi

if enabled sdl2; then
    SDL2_CONFIG="${cross_prefix}sdl2-config"
    test_pkg_config sdl2 "sdl2 >= 2.0.1 sdl2 < 2.1.0" SDL_events.h SDL_PollEvent
    if disabled sdl2 && "${SDL2_CONFIG}" --version > /dev/null 2>&1; then
        sdl2_cflags=$("${SDL2_CONFIG}" --cflags)
        sdl2_extralibs=$("${SDL2_CONFIG}" --libs)
        test_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x020001" $sdl2_cflags &&
        test_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) < 0x020100" $sdl2_cflags &&
        check_func_headers SDL_events.h SDL_PollEvent $sdl2_extralibs $sdl2_cflags &&
            enable sdl2
    fi
    if test $target_os = "mingw32"; then
        sdl2_extralibs=$(filter_out '-mwindows' $sdl2_extralibs)
    fi
fi

if enabled decklink; then
    case $target_os in
        mingw32*|mingw64*|win32|win64)
            decklink_outdev_extralibs="$decklink_outdev_extralibs -lole32 -loleaut32"
            decklink_indev_extralibs="$decklink_indev_extralibs -lole32 -loleaut32"
            ;;
    esac
fi

enabled securetransport &&
    check_func SecIdentityCreate "-Wl,-framework,CoreFoundation -Wl,-framework,Security" &&
    check_lib securetransport "Security/SecureTransport.h Security/Security.h" "SSLCreateContext" "-Wl,-framework,CoreFoundation -Wl,-framework,Security" ||
        disable securetransport

enabled securetransport &&
    check_func SecItemImport "-Wl,-framework,CoreFoundation -Wl,-framework,Security"

enabled schannel &&
    check_func_headers "windows.h security.h" InitializeSecurityContext -DSECURITY_WIN32 -lsecur32 &&
    test_cpp_condition winerror.h "defined(SEC_I_CONTEXT_EXPIRED)" &&
    schannel_extralibs="-lsecur32" ||
        disable schannel

makeinfo --version > /dev/null 2>&1 && enable makeinfo  || disable makeinfo
enabled makeinfo \
    && [ 0$(makeinfo --version | grep "texinfo" | sed 's/.*texinfo[^0-9]*\([0-9]*\)\..*/\1/') -ge 5 ] \
    && enable makeinfo_html || disable makeinfo_html
disabled makeinfo_html && texi2html --help 2> /dev/null | grep -q 'init-file' && enable texi2html || disable texi2html
perl -v            > /dev/null 2>&1 && enable perl      || disable perl
pod2man --help     > /dev/null 2>&1 && enable pod2man   || disable pod2man
rsync --help 2> /dev/null | grep -q 'contimeout' && enable rsync_contimeout || disable rsync_contimeout
xmllint --version  > /dev/null 2>&1 && enable xmllint   || disable xmllint

# check V4L2 codecs available in the API
if enabled v4l2_m2m; then
    check_headers linux/fb.h
    check_headers linux/videodev2.h
    test_code cc linux/videodev2.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
    check_cc v4l2_m2m linux/videodev2.h "int i = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_VIDEO_M2M | V4L2_BUF_FLAG_LAST;"
    check_cc vc1_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_VC1_ANNEX_G;"
    check_cc mpeg1_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG1;"
    check_cc mpeg2_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG2;"
    check_cc mpeg4_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG4;"
    check_cc hevc_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_HEVC;"
    check_cc h263_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_H263;"
    check_cc h264_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_H264;"
    check_cc vp8_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_VP8;"
    check_cc vp9_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_VP9;"
fi

check_headers sys/videoio.h
test_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete

check_lib user32 "windows.h winuser.h" GetShellWindow -luser32
check_lib vfw32 "windows.h vfw.h" capCreateCaptureWindow -lvfw32
# check that WM_CAP_DRIVER_CONNECT is defined to the proper value
# w32api 3.12 had it defined wrong
check_cpp_condition vfwcap_defines vfw.h "WM_CAP_DRIVER_CONNECT > WM_USER"

check_type "dshow.h" IBaseFilter

# check for ioctl_meteor.h, ioctl_bt848.h and alternatives
check_headers "dev/bktr/ioctl_meteor.h dev/bktr/ioctl_bt848.h"                   ||
    check_headers "machine/ioctl_meteor.h machine/ioctl_bt848.h"                 ||
    check_headers "dev/video/meteor/ioctl_meteor.h dev/video/bktr/ioctl_bt848.h" ||
    check_headers "dev/ic/bt8xx.h"

if check_struct sys/soundcard.h audio_buf_info bytes; then
    enable_sanitized sys/soundcard.h
else
    test_cc -D__BSD_VISIBLE -D__XSI_VISIBLE <<EOF && add_cppflags -D__BSD_VISIBLE -D__XSI_VISIBLE && enable_sanitized sys/soundcard.h
    #include <sys/soundcard.h>
    audio_buf_info abc;
EOF
fi

enabled alsa && { check_pkg_config alsa alsa "alsa/asoundlib.h" snd_pcm_htimestamp ||
                  check_lib alsa alsa/asoundlib.h snd_pcm_htimestamp -lasound; }

enabled libjack &&
    require_pkg_config libjack jack jack/jack.h jack_port_get_latency_range

enabled sndio && { check_pkg_config sndio sndio "sndio.h" sio_open ||
                   check_lib sndio sndio.h sio_open -lsndio; }

if enabled libcdio; then
    check_pkg_config libcdio libcdio_paranoia "cdio/cdda.h cdio/paranoia.h" cdio_cddap_open ||
    check_pkg_config libcdio libcdio_paranoia "cdio/paranoia/cdda.h cdio/paranoia/paranoia.h" cdio_cddap_open ||
    check_lib libcdio "cdio/cdda.h cdio/paranoia.h" cdio_cddap_open -lcdio_paranoia -lcdio_cdda -lcdio ||
    check_lib libcdio "cdio/paranoia/cdda.h cdio/paranoia/paranoia.h" cdio_cddap_open -lcdio_paranoia -lcdio_cdda -lcdio ||
    die "ERROR: No usable libcdio/cdparanoia found"
fi

enabled libxcb && check_pkg_config libxcb "xcb >= 1.4" xcb/xcb.h xcb_connect ||
    disable libxcb_shm libxcb_shape libxcb_xfixes

if enabled libxcb; then
    enabled libxcb_shm    && check_pkg_config libxcb_shm    xcb-shm    xcb/shm.h    xcb_shm_attach
    enabled libxcb_shape  && check_pkg_config libxcb_shape  xcb-shape  xcb/shape.h  xcb_shape_get_rectangles
    enabled libxcb_xfixes && check_pkg_config libxcb_xfixes xcb-xfixes xcb/xfixes.h xcb_xfixes_get_cursor_image
fi

check_func_headers "windows.h" CreateDIBSection "$gdigrab_indev_extralibs"

# d3d11va requires linking directly to dxgi and d3d11 if not building for
# the desktop api partition
test_cpp <<EOF && enable uwp && d3d11va_extralibs="-ldxgi -ld3d11"
#ifdef WINAPI_FAMILY
#include <winapifamily.h>
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#error desktop, not uwp
#else
// WINAPI_FAMILY_APP, WINAPI_FAMILY_PHONE_APP => UWP
#endif
#else
#error no family set
#endif
EOF

enabled libdrm &&
    check_pkg_config libdrm_getfb2 libdrm "xf86drmMode.h" drmModeGetFB2

enabled vaapi &&
    check_pkg_config vaapi "libva >= 0.35.0" "va/va.h" vaInitialize

if enabled vaapi; then
    check_pkg_config vaapi_drm "libva-drm" "va/va_drm.h" vaGetDisplayDRM

    if enabled xlib_x11; then
        check_pkg_config vaapi_x11 "libva-x11" "va/va_x11.h" vaGetDisplay
    fi

    check_cpp_condition vaapi_1 "va/va.h" "VA_CHECK_VERSION(1, 0, 0)"

    check_type "va/va.h va/va_dec_hevc.h" "VAPictureParameterBufferHEVC"
    check_struct "va/va.h" "VADecPictureParameterBufferVP9" bit_depth
    check_struct "va/va.h" "VADecPictureParameterBufferAV1" bit_depth_idx
    check_type   "va/va.h va/va_vpp.h" "VAProcFilterParameterBufferHDRToneMapping"
    check_struct "va/va.h va/va_vpp.h" "VAProcPipelineCaps" rotation_flags
    check_type "va/va.h va/va_enc_hevc.h" "VAEncPictureParameterBufferHEVC"
    check_type "va/va.h va/va_enc_jpeg.h" "VAEncPictureParameterBufferJPEG"
    check_type "va/va.h va/va_enc_vp8.h"  "VAEncPictureParameterBufferVP8"
    check_type "va/va.h va/va_enc_vp9.h"  "VAEncPictureParameterBufferVP9"
fi

if enabled_all opencl libdrm ; then
    check_type "CL/cl_intel.h" "clCreateImageFromFdINTEL_fn" &&
        enable opencl_drm_beignet
    check_func_headers "CL/cl_ext.h" clImportMemoryARM &&
        enable opencl_drm_arm
fi

if enabled_all opencl vaapi ; then
    if enabled opencl_drm_beignet ; then
        enable opencl_vaapi_beignet
    else
        check_type "CL/cl.h CL/cl_va_api_media_sharing_intel.h" "clCreateFromVA_APIMediaSurfaceINTEL_fn" &&
            enable opencl_vaapi_intel_media
    fi
fi

if enabled_all opencl dxva2 ; then
    check_type "CL/cl_dx9_media_sharing.h" cl_dx9_surface_info_khr &&
        enable opencl_dxva2
fi

if enabled_all opencl d3d11va ; then
    check_type "CL/cl_d3d11.h" clGetDeviceIDsFromD3D11KHR_fn &&
        enable opencl_d3d11
fi

enabled vdpau &&
    check_cpp_condition vdpau vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP"

enabled vdpau &&
    check_lib vdpau_x11 "vdpau/vdpau.h vdpau/vdpau_x11.h" vdp_device_create_x11 -lvdpau -lX11

enabled crystalhd && check_lib crystalhd "stdint.h libcrystalhd/libcrystalhd_if.h" DtsCrystalHDVersion -lcrystalhd

if enabled vulkan; then
    check_pkg_config_header_only vulkan "vulkan >= 1.2.189" "vulkan/vulkan.h" "defined VK_VERSION_1_2" ||
        check_cpp_condition vulkan "vulkan/vulkan.h" "defined(VK_VERSION_1_3) || (defined(VK_VERSION_1_2) && VK_HEADER_VERSION >= 189)"
fi

if enabled x86; then
    case $target_os in
        mingw32*|mingw64*|win32|win64|linux|cygwin*)
            ;;
        *)
            disable ffnvcodec cuvid nvdec nvenc
            ;;
    esac
elif enabled_any aarch64 ppc64 && ! enabled bigendian; then
    case $target_os in
        linux)
            ;;
        *)
            disable ffnvcodec cuvid nvdec nvenc
            ;;
    esac
else
    disable ffnvcodec cuvid nvdec nvenc
fi

enabled ffnvcodec && enable cuda

enabled nvenc &&
    test_cc -I$source_path <<EOF || disable nvenc
#include <ffnvcodec/nvEncodeAPI.h>
NV_ENCODE_API_FUNCTION_LIST flist;
void f(void) { struct { const GUID guid; } s[] = { { NV_ENC_PRESET_HQ_GUID } }; }
int main(void) { return 0; }
EOF

if enabled_any nvdec cuvid; then
    check_type "ffnvcodec/dynlink_cuda.h ffnvcodec/dynlink_cuviddec.h" "CUVIDAV1PICPARAMS"
fi

enabled amf &&
    check_cpp_condition amf "AMF/core/Version.h" \
        "(AMF_VERSION_MAJOR << 48 | AMF_VERSION_MINOR << 32 | AMF_VERSION_RELEASE << 16 | AMF_VERSION_BUILD_NUM) >= 0x0001000400090000"

# Funny iconv installations are not unusual, so check it after all flags have been set
if enabled libc_iconv; then
    check_func_headers iconv.h iconv
elif enabled iconv; then
    check_func_headers iconv.h iconv || check_lib iconv iconv.h iconv -liconv
fi

enabled debug && add_cflags -g"$debuglevel" && add_asflags -g"$debuglevel"

# add some useful compiler flags if supported
check_cflags -Wdeclaration-after-statement
check_cflags -Wall
check_cflags -Wdisabled-optimization
check_cflags -Wpointer-arith
check_cflags -Wredundant-decls
check_cflags -Wwrite-strings
check_cflags -Wtype-limits
check_cflags -Wundef
check_cflags -Wmissing-prototypes
check_cflags -Wstrict-prototypes
check_cflags -Wempty-body

if enabled extra_warnings; then
    check_cflags -Wcast-qual
    check_cflags -Wextra
    check_cflags -Wpedantic
fi

check_disable_warning(){
    warning_flag=-W${1#-Wno-}
    test_cflags $unknown_warning_flags $warning_flag && add_cflags $1
}

test_cflags -Werror=unused-command-line-argument &&
    append unknown_warning_flags "-Werror=unused-command-line-argument"
test_cflags -Werror=unknown-warning-option &&
    append unknown_warning_flags "-Werror=unknown-warning-option"

check_disable_warning -Wno-parentheses
check_disable_warning -Wno-switch
check_disable_warning -Wno-format-zero-length
check_disable_warning -Wno-pointer-sign
check_disable_warning -Wno-unused-const-variable
check_disable_warning -Wno-bool-operation
check_disable_warning -Wno-char-subscripts

check_disable_warning_headers(){
    warning_flag=-W${1#-Wno-}
    test_cflags $warning_flag && add_cflags_headers $1
}

check_disable_warning_headers -Wno-deprecated-declarations
check_disable_warning_headers -Wno-unused-variable

test_cc <<EOF && enable blocks_extension
void (^block)(void);
EOF

# add some linker flags
check_ldflags -Wl,--warn-common
check_ldflags -Wl,-rpath-link=:libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil
enabled rpath && add_ldexeflags -Wl,-rpath,$libdir && add_ldsoflags -Wl,-rpath,$libdir
test_ldflags -Wl,-Bsymbolic && append SHFLAGS -Wl,-Bsymbolic

# add some strip flags
check_stripflags -x

enabled neon_clobber_test &&
    check_ldflags -Wl,--wrap,avcodec_open2              \
                  -Wl,--wrap,avcodec_decode_subtitle2   \
                  -Wl,--wrap,avcodec_encode_subtitle    \
                  -Wl,--wrap,avcodec_send_packet        \
                  -Wl,--wrap,avcodec_receive_packet     \
                  -Wl,--wrap,avcodec_send_frame         \
                  -Wl,--wrap,avcodec_receive_frame      \
                  -Wl,--wrap,swr_convert        ||
    disable neon_clobber_test

enabled xmm_clobber_test &&
    check_ldflags -Wl,--wrap,avcodec_open2              \
                  -Wl,--wrap,avcodec_decode_subtitle2   \
                  -Wl,--wrap,avcodec_encode_subtitle    \
                  -Wl,--wrap,avcodec_send_packet        \
                  -Wl,--wrap,avcodec_receive_packet     \
                  -Wl,--wrap,avcodec_send_frame         \
                  -Wl,--wrap,avcodec_receive_frame      \
                  -Wl,--wrap,swr_convert                \
                  -Wl,--wrap,sws_scale ||
    disable xmm_clobber_test

check_ld "cc" proper_dce <<EOF
extern const int array[512];
static inline int func(void) { return array[0]; }
int main(void) { return 0; }
EOF

if enabled proper_dce; then
    echo "X { local: *; };" > $TMPV
    if test_ldflags -Wl,${version_script},$TMPV; then
        append SHFLAGS '-Wl,${version_script},\$(SUBDIR)lib\$(NAME).ver'
        quotes='""'
        test_cc <<EOF && enable symver_asm_label
void ff_foo(void) __asm__ ("av_foo@VERSION");
void ff_foo(void) { ${inline_asm+__asm__($quotes);} }
EOF
        test_cc <<EOF && enable symver_gnu_asm
__asm__(".symver ff_foo,av_foo@VERSION");
void ff_foo(void) {}
EOF
    fi
fi

if [ -z "$optflags" ]; then
    if enabled small; then
        optflags=$cflags_size
    elif enabled optimizations; then
        optflags=$cflags_speed
    else
        optflags=$cflags_noopt
    fi
fi

check_optflags(){
    check_cflags "$@"
    enabled lto && check_ldflags "$@"
}

check_optflags $optflags
check_optflags -fno-math-errno
check_optflags -fno-signed-zeros

if enabled lto; then
    test "$cc_type" != "$ld_type" && die "LTO requires same compiler and linker"
    check_cflags  -flto
    check_ldflags -flto $cpuflags
    disable inline_asm_direct_symbol_refs
fi

enabled ftrapv && check_cflags -ftrapv

test_cc -mno-red-zone <<EOF && noredzone_flags="-mno-red-zone"
int x;
EOF


if enabled icc; then
    # Just warnings, no remarks
    check_cflags -w1
    # -wd: Disable following warnings
    # 144, 167, 556: -Wno-pointer-sign
    # 188: enumerated type mixed with another type
    # 1292: attribute "foo" ignored
    # 1419: external declaration in primary source file
    # 10006: ignoring unknown option -fno-signed-zeros
    # 10148: ignoring unknown option -Wno-parentheses
    # 10156: ignoring option '-W'; no argument required
    # 13200: No EMMS instruction before call to function
    # 13203: No EMMS instruction before return from function
    check_cflags -wd144,167,188,556,1292,1419,10006,10148,10156,13200,13203
    # 11030: Warning unknown option --as-needed
    # 10156: ignoring option '-export'; no argument required
    check_ldflags -wd10156,11030
    # icc 11.0 and 11.1 work with ebp_available, but don't pass the test
    enable ebp_available
    # The test above does not test linking
    enabled lto && disable symver_asm_label
    if enabled x86_32; then
        icc_version=$($cc -dumpversion)
        test ${icc_version%%.*} -ge 11 &&
            check_cflags -falign-stack=maintain-16-byte ||
            disable aligned_stack
    fi
elif enabled gcc; then
    check_optflags -fno-tree-vectorize
    check_cflags -Werror=format-security
    check_cflags -Werror=implicit-function-declaration
    check_cflags -Werror=missing-prototypes
    check_cflags -Werror=return-type
    check_cflags -Werror=vla
    check_cflags -Wformat
    check_cflags -fdiagnostics-color=auto
    enabled extra_warnings || check_disable_warning -Wno-maybe-uninitialized
    if enabled x86_32; then
        case $target_os in
        *bsd*)
            # BSDs don't guarantee a 16 byte aligned stack, but we can
            # request GCC to try to maintain 16 byte alignment throughout
            # function calls. Library entry points that might call assembly
            # functions align the stack. (The parameter means 2^4 bytes.)
            check_cflags -mpreferred-stack-boundary=4
            ;;
        esac
    fi
elif enabled llvm_gcc; then
    check_cflags -mllvm -stack-alignment=16
elif enabled clang; then
    if enabled x86_32; then
        # Clang doesn't support maintaining alignment without assuming the
        # same alignment in every function. If 16 byte alignment would be
        # enabled, one would also have to either add attribute_align_arg on
        # every single entry point into the libraries or enable -mstackrealign
        # (doing stack realignment in every single function).
        case $target_os in
        mingw32|win32|*bsd*)
            disable aligned_stack
            ;;
        *)
            check_cflags -mllvm -stack-alignment=16
            check_cflags -mstack-alignment=16
            ;;
        esac
    else
        check_cflags -mllvm -stack-alignment=16
        check_cflags -mstack-alignment=16
    fi
    check_cflags -Qunused-arguments
    check_cflags -Werror=implicit-function-declaration
    check_cflags -Werror=missing-prototypes
    check_cflags -Werror=return-type
elif enabled cparser; then
    add_cflags -Wno-missing-variable-declarations
    add_cflags -Wno-empty-statement
elif enabled armcc; then
    add_cflags -W${armcc_opt},--diag_suppress=4343 # hardfp compat
    add_cflags -W${armcc_opt},--diag_suppress=3036 # using . as system include dir
    # 2523: use of inline assembly is deprecated
    add_cflags -W${armcc_opt},--diag_suppress=2523
    add_cflags -W${armcc_opt},--diag_suppress=1207
    add_cflags -W${armcc_opt},--diag_suppress=1293 # assignment in condition
    add_cflags -W${armcc_opt},--diag_suppress=3343 # hardfp compat
    add_cflags -W${armcc_opt},--diag_suppress=167  # pointer sign
    add_cflags -W${armcc_opt},--diag_suppress=513  # pointer sign
elif enabled pathscale; then
    add_cflags -fstrict-overflow -OPT:wrap_around_unsafe_opt=OFF
    disable inline_asm
elif enabled_any msvc icl; then
    enabled x86_32 && disable aligned_stack
    enabled_all x86_32 debug && add_cflags -Oy-
    enabled debug && add_ldflags -debug
    enable pragma_deprecated
    if enabled icl; then
        # -Qansi-alias is basically -fstrict-aliasing, but does not work
        # (correctly) on icl 13.x.
        test_cpp_condition "windows.h" "__ICL < 1300 || __ICL >= 1400" &&
            add_cflags -Qansi-alias
        # Some inline asm is not compilable in debug
        if enabled debug; then
            disable ebp_available
            disable ebx_available
        fi
    fi
    # msvcrt10 x64 incorrectly enables log2, only msvcrt12 (MSVC 2013) onwards actually has log2.
    check_cpp_condition log2 crtversion.h "_VC_CRT_MAJOR_VERSION >= 12"
    # The CRT headers contain __declspec(restrict) in a few places, but if redefining
    # restrict, this might break. MSVC 2010 and 2012 fail with __declspec(__restrict)
    # (as it ends up if the restrict redefine is done before including stdlib.h), while
    # MSVC 2013 and newer can handle it fine.
    # If this declspec fails, force including stdlib.h before the restrict redefinition
    # happens in config.h.
    if [ $restrict_keyword != restrict ]; then
        test_cc <<EOF || add_cflags -FIstdlib.h
__declspec($restrict_keyword) void *foo(int);
EOF
    fi
    # the new SSA optimzer in VS2015 U3 is mis-optimizing some parts of the code
    # Issue has been fixed in MSVC v19.00.24218.
    test_cpp_condition windows.h "_MSC_FULL_VER >= 190024218" ||
        check_cflags -d2SSAOptimizer-
    # enable utf-8 source processing on VS2015 U2 and newer
    test_cpp_condition windows.h "_MSC_FULL_VER >= 190023918" &&
        add_cflags -utf-8
fi

for pfx in "" host_; do
    varname=${pfx%_}cc_type
    eval "type=\$$varname"
    if [ "$type" = "msvc" ]; then
        test_${pfx}cc <<EOF || add_${pfx}cflags -Dinline=__inline
static inline int foo(int a) { return a; }
EOF
    fi
done

case $as_type in
    clang)
        add_asflags -Qunused-arguments
    ;;
esac

case $ld_type in
    clang)
        check_ldflags -Qunused-arguments
    ;;
esac

enable frame_thread_encoder

# these filters depend on removed avcodec APIs
# they are kept disabled for now, but will be removed if
# nobody updates and re-enables them
disable mcdeint_filter
disable uspp_filter

enabled asm || { arch=c; disable $ARCH_LIST $ARCH_EXT_LIST; }

check_deps $CONFIG_LIST       \
           $CONFIG_EXTRA      \
           $HAVE_LIST         \
           $ALL_COMPONENTS    \

enabled threads && ! enabled pthreads && ! enabled atomics_native && die "non pthread threading without atomics not supported, try adding --enable-pthreads or --cpu=i486 or higher if you are on x86"

case $target_os in
haiku)
    disable memalign
    disable posix_memalign
    ;;
*-dos|freedos|opendos)
    if test_cpp_condition sys/version.h "defined(__DJGPP__) && __DJGPP__ == 2 && __DJGPP_MINOR__ == 5"; then
        disable memalign
    fi
    ;;
esac

flatten_extralibs(){
    nested_entries=
    list_name=$1
    eval list=\$${1}
    for entry in $list; do
        entry_copy=$entry
        resolve entry_copy
        flat_entries=
        for e in $entry_copy; do
            case $e in
                *_extralibs) nested_entries="$nested_entries$e ";;
                          *) flat_entries="$flat_entries$e ";;
            esac
        done
        eval $entry="\$flat_entries"
    done
    append $list_name "$nested_entries"

    resolve nested_entries
    if test -n "$(filter '*_extralibs' $nested_entries)"; then
        flatten_extralibs $list_name
    fi
}

flatten_extralibs_wrapper(){
    list_name=$1
    flatten_extralibs $list_name
    unique $list_name
    resolve $list_name
    eval $list_name=\$\(\$ldflags_filter \$$list_name\)
    eval printf \''%s'\' \""\$$list_name"\"
}

for linkunit in $LIBRARY_LIST; do
    unset current_extralibs
    eval components=\$$(toupper ${linkunit})_COMPONENTS_LIST
    for comp in ${components}; do
        enabled $comp || continue
        comp_extralibs="${comp}_extralibs"
        append current_extralibs $comp_extralibs
    done
    eval prepend ${linkunit}_extralibs $current_extralibs
done

for linkunit in $LIBRARY_LIST $PROGRAM_LIST $EXTRALIBS_LIST; do
    eval ${linkunit}_extralibs=\$\(flatten_extralibs_wrapper ${linkunit}_extralibs\)
done

map 'enabled $v && intrinsics=${v#intrinsics_}' $INTRINSICS_LIST

for thread in $THREADS_LIST; do
    if enabled $thread; then
        test -n "$thread_type" &&
            die "ERROR: Only one thread type must be selected." ||
            thread_type="$thread"
    fi
done

if disabled stdatomic; then
    if enabled atomics_gcc; then
        add_cppflags '-I\$(SRC_PATH)/compat/atomics/gcc'
    elif enabled atomics_win32; then
        add_cppflags '-I\$(SRC_PATH)/compat/atomics/win32'
    elif enabled atomics_suncc; then
        add_cppflags '-I\$(SRC_PATH)/compat/atomics/suncc'
    elif enabled pthreads; then
        add_compat atomics/pthread/stdatomic.o
        add_cppflags '-I\$(SRC_PATH)/compat/atomics/pthread'
    else
        enabled threads && die "Threading is enabled, but no atomics are available"
        add_cppflags '-I\$(SRC_PATH)/compat/atomics/dummy'
    fi
fi

# Check if requested libraries were found.
for lib in $AUTODETECT_LIBS; do
    requested $lib && ! enabled $lib && die "ERROR: $lib requested but not found";
done

enabled zlib && add_cppflags -DZLIB_CONST

# conditional library dependencies, in any order
enabled afir_filter         && prepend avfilter_deps "avcodec"
enabled amovie_filter       && prepend avfilter_deps "avformat avcodec"
enabled aresample_filter    && prepend avfilter_deps "swresample"
enabled atempo_filter       && prepend avfilter_deps "avcodec"
enabled bm3d_filter         && prepend avfilter_deps "avcodec"
enabled cover_rect_filter   && prepend avfilter_deps "avformat avcodec"
enabled ebur128_filter && enabled swresample && prepend avfilter_deps "swresample"
enabled elbg_filter         && prepend avfilter_deps "avcodec"
enabled fftfilt_filter      && prepend avfilter_deps "avcodec"
enabled find_rect_filter    && prepend avfilter_deps "avformat avcodec"
enabled firequalizer_filter && prepend avfilter_deps "avcodec"
enabled mcdeint_filter      && prepend avfilter_deps "avcodec"
enabled movie_filter    && prepend avfilter_deps "avformat avcodec"
enabled pan_filter          && prepend avfilter_deps "swresample"
enabled pp_filter           && prepend avfilter_deps "postproc"
enabled removelogo_filter   && prepend avfilter_deps "avformat avcodec swscale"
enabled sab_filter          && prepend avfilter_deps "swscale"
enabled scale_filter    && prepend avfilter_deps "swscale"
enabled scale2ref_filter    && prepend avfilter_deps "swscale"
enabled showcqt_filter      && prepend avfilter_deps "avformat swscale"
enabled signature_filter    && prepend avfilter_deps "avcodec avformat"
enabled smartblur_filter    && prepend avfilter_deps "swscale"
enabled spp_filter          && prepend avfilter_deps "avcodec"
enabled sr_filter           && prepend avfilter_deps "avformat swscale"
enabled subtitles_filter    && prepend avfilter_deps "avformat avcodec"
enabled uspp_filter         && prepend avfilter_deps "avcodec"
enabled zoompan_filter      && prepend avfilter_deps "swscale"

enabled lavfi_indev         && prepend avdevice_deps "avfilter"

#FIXME
enabled_any sdl2_outdev opengl_outdev && enabled sdl2 &&
    add_cflags $(filter_out '-Dmain=SDL_main' $sdl2_cflags)

enabled opus_decoder    && prepend avcodec_deps "swresample"

# reorder the items at var $1 to align with the items order at var $2 .
# die if an item at $1 is not at $2 .
reorder_by(){
    eval rb_in=\$$1
    eval rb_ordered=\$$2

    for rb in $rb_in; do
        is_in $rb $rb_ordered || die "$rb at \$$1 is not at \$$2"
    done

    rb_out=
    for rb in $rb_ordered; do
        is_in $rb $rb_in && rb_out="$rb_out$rb "
    done
    eval $1=\$rb_out
}

# deps-expand fflib $1:  N x {append all expanded deps; unique}
# within a set of N items, N expansions are enough to expose a cycle.
expand_deps(){
    unique ${1}_deps  # required for the early break test.
    for dummy in $LIBRARY_LIST; do  # N iteratios
        eval deps=\$${1}_deps
        append ${1}_deps $(map 'eval echo \$${v}_deps' $deps)
        unique ${1}_deps
        eval '[ ${#deps} = ${#'${1}_deps'} ]' && break  # doesn't expand anymore
    done

    eval is_in $1 \$${1}_deps && die "Dependency cycle at ${1}_deps"
    reorder_by ${1}_deps LIBRARY_LIST  # linking order is expected later
}

#we have to remove gpl from the deps here as some code assumes all lib deps are libs
postproc_deps="$(filter_out 'gpl' $postproc_deps)"

map 'expand_deps $v' $LIBRARY_LIST

if test "$quiet" != "yes"; then

echo "install prefix            $prefix"
echo "source path               $source_path"
echo "C compiler                $cc"
echo "C library                 $libc_type"
if test "$host_cc" != "$cc"; then
    echo "host C compiler           $host_cc"
    echo "host C library            $host_libc_type"
fi
echo "ARCH                      $arch ($cpu)"
if test "$build_suffix" != ""; then
    echo "build suffix              $build_suffix"
fi
if test "$progs_suffix" != ""; then
    echo "progs suffix              $progs_suffix"
fi
if test "$extra_version" != ""; then
    echo "version string suffix     $extra_version"
fi
echo "big-endian                ${bigendian-no}"
echo "runtime cpu detection     ${runtime_cpudetect-no}"
if enabled x86; then
    echo "standalone assembly       ${x86asm-no}"
    echo "x86 assembler             ${x86asmexe}"
    echo "MMX enabled               ${mmx-no}"
    echo "MMXEXT enabled            ${mmxext-no}"
    echo "3DNow! enabled            ${amd3dnow-no}"
    echo "3DNow! extended enabled   ${amd3dnowext-no}"
    echo "SSE enabled               ${sse-no}"
    echo "SSSE3 enabled             ${ssse3-no}"
    echo "AESNI enabled             ${aesni-no}"
    echo "AVX enabled               ${avx-no}"
    echo "AVX2 enabled              ${avx2-no}"
    echo "AVX-512 enabled           ${avx512-no}"
    echo "XOP enabled               ${xop-no}"
    echo "FMA3 enabled              ${fma3-no}"
    echo "FMA4 enabled              ${fma4-no}"
    echo "i686 features enabled     ${i686-no}"
    echo "CMOV is fast              ${fast_cmov-no}"
    echo "EBX available             ${ebx_available-no}"
    echo "EBP available             ${ebp_available-no}"
fi
if enabled aarch64; then
    echo "NEON enabled              ${neon-no}"
    echo "VFP enabled               ${vfp-no}"
fi
if enabled arm; then
    echo "ARMv5TE enabled           ${armv5te-no}"
    echo "ARMv6 enabled             ${armv6-no}"
    echo "ARMv6T2 enabled           ${armv6t2-no}"
    echo "VFP enabled               ${vfp-no}"
    echo "NEON enabled              ${neon-no}"
    echo "THUMB enabled             ${thumb-no}"
fi
if enabled mips; then
    echo "MIPS FPU enabled          ${mipsfpu-no}"
    echo "MIPS DSP R1 enabled       ${mipsdsp-no}"
    echo "MIPS DSP R2 enabled       ${mipsdspr2-no}"
    echo "MIPS MSA enabled          ${msa-no}"
    echo "LOONGSON MMI enabled      ${mmi-no}"
fi
if enabled ppc; then
    echo "AltiVec enabled           ${altivec-no}"
    echo "VSX enabled               ${vsx-no}"
    echo "POWER8 enabled            ${power8-no}"
    echo "PPC 4xx optimizations     ${ppc4xx-no}"
    echo "dcbzl available           ${dcbzl-no}"
fi
if enabled loongarch; then
    echo "LSX enabled               ${lsx-no}"
    echo "LASX enabled              ${lasx-no}"
fi
echo "debug symbols             ${debug-no}"
echo "strip symbols             ${stripping-no}"
echo "optimize for size         ${small-no}"
echo "optimizations             ${optimizations-no}"
echo "static                    ${static-no}"
echo "shared                    ${shared-no}"
echo "postprocessing support    ${postproc-no}"
echo "network support           ${network-no}"
echo "threading support         ${thread_type-no}"
echo "safe bitstream reader     ${safe_bitstream_reader-no}"
echo "texi2html enabled         ${texi2html-no}"
echo "perl enabled              ${perl-no}"
echo "pod2man enabled           ${pod2man-no}"
echo "makeinfo enabled          ${makeinfo-no}"
echo "makeinfo supports HTML    ${makeinfo_html-no}"
echo "xmllint enabled           ${xmllint-no}"
test -n "$random_seed" &&
    echo "random seed               ${random_seed}"
echo

echo "External libraries:"
print_enabled '' $EXTERNAL_LIBRARY_LIST $EXTERNAL_AUTODETECT_LIBRARY_LIST | print_in_columns
echo

echo "External libraries providing hardware acceleration:"
print_enabled '' $HWACCEL_LIBRARY_LIST $HWACCEL_AUTODETECT_LIBRARY_LIST | print_in_columns
echo

echo "Libraries:"
print_enabled '' $LIBRARY_LIST | print_in_columns
echo

echo "Programs:"
print_enabled '' $PROGRAM_LIST | print_in_columns
echo

for type in decoder encoder hwaccel parser demuxer muxer protocol filter bsf indev outdev; do
    echo "Enabled ${type}s:"
    eval list=\$$(toupper $type)_LIST
    print_enabled '_*' $list | print_in_columns
    echo
done

if test -n "$ignore_tests"; then
    ignore_tests=$(echo $ignore_tests | tr ',' ' ')
    echo "Ignored FATE tests:"
    echo $ignore_tests | print_in_columns
    echo
fi

echo "License: $license"

fi # test "$quiet" != "yes"

if test -n "$WARN_IF_GETS_DISABLED_LIST"; then
    for cfg in $WARN_IF_GETS_DISABLED_LIST; do
        if disabled $cfg; then
            varname=${cfg}_disable_reason
            eval "warn \"Disabled $cfg because \$$varname\""
        fi
    done
fi

if test -n "$WARNINGS"; then
    printf "\n%s%s$WARNINGS%s" "$warn_color" "$bold_color" "$reset_color"
    enabled fatal_warnings && exit 1
fi

test -e Makefile || echo "include $source_path/Makefile" > Makefile

esc(){
    echo "$*" | sed 's/%/%25/g;s/:/%3a/g'
}

echo "config:$arch:$subarch:$cpu:$target_os:$(esc $cc_ident):$(esc $FFMPEG_CONFIGURATION)" > ffbuild/config.fate

enabled stripping || strip="echo skipping strip"
enabled stripping || striptype=""

config_files="$TMPH ffbuild/config.mak doc/config.texi"

cat > ffbuild/config.mak <<EOF
# Automatically generated by configure - do not modify!
ifndef FFMPEG_CONFIG_MAK
FFMPEG_CONFIG_MAK=1
FFMPEG_CONFIGURATION=$FFMPEG_CONFIGURATION
prefix=$prefix
LIBDIR=\$(DESTDIR)$libdir
SHLIBDIR=\$(DESTDIR)$shlibdir
INCDIR=\$(DESTDIR)$incdir
BINDIR=\$(DESTDIR)$bindir
DATADIR=\$(DESTDIR)$datadir
DOCDIR=\$(DESTDIR)$docdir
MANDIR=\$(DESTDIR)$mandir
PKGCONFIGDIR=\$(DESTDIR)$pkgconfigdir
INSTALL_NAME_DIR=$install_name_dir
SRC_PATH=$source_path
SRC_LINK=$source_link
ifndef MAIN_MAKEFILE
SRC_PATH:=\$(SRC_PATH:.%=..%)
endif
CC_IDENT=$cc_ident
ARCH=$arch
INTRINSICS=$intrinsics
EXTERN_PREFIX=$extern_prefix
CC=$cc
CXX=$cxx
AS=$as
OBJCC=$objcc
LD=$ld
DEPCC=$dep_cc
DEPCCFLAGS=$DEPCCFLAGS \$(CPPFLAGS)
DEPAS=$as
DEPASFLAGS=$DEPASFLAGS \$(CPPFLAGS)
X86ASM=$x86asmexe
DEPX86ASM=$x86asmexe
DEPX86ASMFLAGS=\$(X86ASMFLAGS)
AR=$ar
ARFLAGS=$arflags
AR_O=$ar_o
AR_CMD=$ar
NM_CMD=$nm
METALCC=$metalcc
METALLIB=$metallib
RANLIB=$ranlib
STRIP=$strip
STRIPTYPE=$striptype
NVCC=$nvcc
CP=cp -p
LN_S=$ln_s
CPPFLAGS=$CPPFLAGS
CFLAGS=$CFLAGS
CXXFLAGS=$CXXFLAGS
OBJCCFLAGS=$OBJCFLAGS
ASFLAGS=$ASFLAGS
NVCCFLAGS=$nvccflags
AS_C=$AS_C
AS_O=$AS_O
OBJCC_C=$OBJCC_C
OBJCC_E=$OBJCC_E
OBJCC_O=$OBJCC_O
CC_C=$CC_C
CC_E=$CC_E
CC_O=$CC_O
CXX_C=$CXX_C
CXX_O=$CXX_O
NVCC_C=$NVCC_C
NVCC_O=$NVCC_O
LD_O=$LD_O
X86ASM_O=$X86ASM_O
LD_LIB=$LD_LIB
LD_PATH=$LD_PATH
DLLTOOL=$dlltool
WINDRES=$windres
DOXYGEN=$doxygen
LDFLAGS=$LDFLAGS
LDEXEFLAGS=$LDEXEFLAGS
LDSOFLAGS=$LDSOFLAGS
SHFLAGS=$(echo $($ldflags_filter $SHFLAGS))
ASMSTRIPFLAGS=$ASMSTRIPFLAGS
X86ASMFLAGS=$X86ASMFLAGS
MSAFLAGS=$MSAFLAGS
MMIFLAGS=$MMIFLAGS
LSXFLAGS=$LSXFLAGS
LASXFLAGS=$LASXFLAGS
BUILDSUF=$build_suffix
PROGSSUF=$progs_suffix
FULLNAME=$FULLNAME
LIBPREF=$LIBPREF
LIBSUF=$LIBSUF
LIBNAME=$LIBNAME
SLIBPREF=$SLIBPREF
SLIBSUF=$SLIBSUF
EXESUF=$EXESUF
EXTRA_VERSION=$extra_version
CCDEP=$CCDEP
CXXDEP=$CXXDEP
CCDEP_FLAGS=$CCDEP_FLAGS
ASDEP=$ASDEP
ASDEP_FLAGS=$ASDEP_FLAGS
X86ASMDEP=$X86ASMDEP
X86ASMDEP_FLAGS=$X86ASMDEP_FLAGS
CC_DEPFLAGS=$CC_DEPFLAGS
CXX_DEPFLAGS=$CXX_DEPFLAGS
OBJCC_DEPFLAGS=$OBJC_DEPFLAGS
AS_DEPFLAGS=$AS_DEPFLAGS
X86ASM_DEPFLAGS=$X86ASM_DEPFLAGS
HOSTCC=$host_cc
HOSTLD=$host_ld
HOSTCFLAGS=$host_cflags
HOSTCPPFLAGS=$host_cppflags
HOSTEXESUF=$HOSTEXESUF
HOSTLDFLAGS=$host_ldflags
HOSTEXTRALIBS=$host_extralibs
DEPHOSTCC=$host_cc
DEPHOSTCCFLAGS=$DEPHOSTCCFLAGS \$(HOSTCCFLAGS)
HOSTCCDEP=$HOSTCCDEP
HOSTCCDEP_FLAGS=$HOSTCCDEP_FLAGS
HOSTCC_DEPFLAGS=$HOSTCC_DEPFLAGS
HOSTCC_C=$HOSTCC_C
HOSTCC_O=$HOSTCC_O
HOSTLD_O=$HOSTLD_O
TARGET_EXEC=$target_exec $target_exec_args
TARGET_PATH=$target_path
TARGET_SAMPLES=${target_samples:-\$(SAMPLES)}
CFLAGS-ffplay=${sdl2_cflags}
CFLAGS_HEADERS=$CFLAGS_HEADERS
LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
EXTRALIBS=$extralibs
COMPAT_OBJS=$compat_objs
INSTALL=$install
LIBTARGET=${LIBTARGET}
SLIBNAME=${SLIBNAME}
SLIBNAME_WITH_VERSION=${SLIBNAME_WITH_VERSION}
SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}
SLIB_CREATE_DEF_CMD=${SLIB_CREATE_DEF_CMD}
SLIB_EXTRA_CMD=${SLIB_EXTRA_CMD}
SLIB_INSTALL_NAME=${SLIB_INSTALL_NAME}
SLIB_INSTALL_LINKS=${SLIB_INSTALL_LINKS}
SLIB_INSTALL_EXTRA_LIB=${SLIB_INSTALL_EXTRA_LIB}
SLIB_INSTALL_EXTRA_SHLIB=${SLIB_INSTALL_EXTRA_SHLIB}
VERSION_SCRIPT_POSTPROCESS_CMD=${VERSION_SCRIPT_POSTPROCESS_CMD}
SAMPLES:=${samples:-\$(FATE_SAMPLES)}
NOREDZONE_FLAGS=$noredzone_flags
LIBFUZZER_PATH=$libfuzzer_path
IGNORE_TESTS=$ignore_tests
EOF

map 'eval echo "${v}_FFLIBS=\$${v}_deps" >> ffbuild/config.mak' $LIBRARY_LIST

for entry in $LIBRARY_LIST $PROGRAM_LIST $EXTRALIBS_LIST; do
    eval echo "EXTRALIBS-${entry}=\$${entry}_extralibs" >> ffbuild/config.mak
done

cat > $TMPH <<EOF
/* Automatically generated by configure - do not modify! */
#ifndef FFMPEG_CONFIG_H
#define FFMPEG_CONFIG_H
#define FFMPEG_CONFIGURATION "$(c_escape $FFMPEG_CONFIGURATION)"
#define FFMPEG_LICENSE "$(c_escape $license)"
#define CONFIG_THIS_YEAR 2022
#define FFMPEG_DATADIR "$(eval c_escape $datadir)"
#define AVCONV_DATADIR "$(eval c_escape $datadir)"
#define CC_IDENT "$(c_escape ${cc_ident:-Unknown compiler})"
#define OS_NAME $target_os
#define av_restrict $restrict_keyword
#define EXTERN_PREFIX "${extern_prefix}"
#define EXTERN_ASM ${extern_prefix}
#define BUILDSUF "$build_suffix"
#define SLIBSUF "$SLIBSUF"
#define HAVE_MMX2 HAVE_MMXEXT
#define SWS_MAX_FILTER_SIZE $sws_max_filter_size
EOF

test -n "$assert_level" &&
    echo "#define ASSERT_LEVEL $assert_level" >>$TMPH

test -n "$malloc_prefix" &&
    echo "#define MALLOC_PREFIX $malloc_prefix" >>$TMPH

if enabled x86asm; then
    append config_files $TMPASM
    cat > $TMPASM <<EOF
; Automatically generated by configure - do not modify!
EOF
fi

enabled getenv || echo "#define getenv(x) NULL" >> $TMPH


mkdir -p doc
mkdir -p tests
mkdir -p tests/api
echo "@c auto-generated by configure - do not modify! " > doc/config.texi

print_config ARCH_   "$config_files" $ARCH_LIST
print_config HAVE_   "$config_files" $HAVE_LIST
print_config CONFIG_ "$config_files" $CONFIG_LIST       \
                                     $CONFIG_EXTRA      \
                                     $ALL_COMPONENTS    \

echo "#endif /* FFMPEG_CONFIG_H */" >> $TMPH
echo "endif # FFMPEG_CONFIG_MAK" >> ffbuild/config.mak

# Do not overwrite an unchanged config.h to avoid superfluous rebuilds.
cp_if_changed $TMPH config.h
touch ffbuild/.config

enabled x86asm && cp_if_changed $TMPASM config.asm

cat > $TMPH <<EOF
/* Generated by ffmpeg configure */
#ifndef AVUTIL_AVCONFIG_H
#define AVUTIL_AVCONFIG_H
EOF

print_config AV_HAVE_ $TMPH $HAVE_LIST_PUB

echo "#endif /* AVUTIL_AVCONFIG_H */" >> $TMPH

cp_if_changed $TMPH libavutil/avconfig.h

# full_filter_name_foo=vf_foo
# full_filter_name_bar=asrc_bar
# ...
eval "$(sed -n "s/^extern const AVFilter ff_\([avfsinkrc]\{2,5\}\)_\(.*\);/full_filter_name_\2=\1_\2/p" $source_path/libavfilter/allfilters.c)"

# generate the lists of enabled components
print_enabled_components(){
    file=$1
    struct_name=$2
    name=$3
    shift 3
    echo "static const $struct_name * const $name[] = {" > $TMPH
    for c in $*; do
        if enabled $c; then
            case $name in
                filter_list)
                    eval c=\$full_filter_name_${c%_filter}
                ;;
                indev_list)
                    c=${c%_indev}_demuxer
                ;;
                outdev_list)
                    c=${c%_outdev}_muxer
                ;;
            esac
            printf "    &ff_%s,\n" $c >> $TMPH
        fi
    done
    if [ "$name" = "filter_list" ]; then
        for c in asrc_abuffer vsrc_buffer asink_abuffer vsink_buffer; do
            printf "    &ff_%s,\n" $c >> $TMPH
        done
    fi
    echo "    NULL };" >> $TMPH
    cp_if_changed $TMPH $file
}

print_enabled_components libavfilter/filter_list.c AVFilter filter_list $FILTER_LIST
print_enabled_components libavcodec/codec_list.c AVCodec codec_list $CODEC_LIST
print_enabled_components libavcodec/parser_list.c AVCodecParser parser_list $PARSER_LIST
print_enabled_components libavcodec/bsf_list.c AVBitStreamFilter bitstream_filters $BSF_LIST
print_enabled_components libavformat/demuxer_list.c AVInputFormat demuxer_list $DEMUXER_LIST
print_enabled_components libavformat/muxer_list.c AVOutputFormat muxer_list $MUXER_LIST
print_enabled_components libavdevice/indev_list.c AVInputFormat indev_list $INDEV_LIST
print_enabled_components libavdevice/outdev_list.c AVOutputFormat outdev_list $OUTDEV_LIST
print_enabled_components libavformat/protocol_list.c URLProtocol url_protocols $PROTOCOL_LIST

# Settings for pkg-config files

cat > $TMPH <<EOF
# Automatically generated by configure - do not modify!
shared=$shared
build_suffix=$build_suffix
prefix=$prefix
libdir=$libdir
incdir=$incdir
rpath=$(enabled rpath && echo "-Wl,-rpath,\${libdir}")
source_path=${source_path}
LIBPREF=${LIBPREF}
LIBSUF=${LIBSUF}
extralibs_avutil="$avutil_extralibs"
extralibs_avcodec="$avcodec_extralibs"
extralibs_avformat="$avformat_extralibs"
extralibs_avdevice="$avdevice_extralibs"
extralibs_avfilter="$avfilter_extralibs"
extralibs_postproc="$postproc_extralibs"
extralibs_swscale="$swscale_extralibs"
extralibs_swresample="$swresample_extralibs"
EOF

for lib in $LIBRARY_LIST; do
    lib_deps="$(eval echo \$${lib}_deps)"
    echo ${lib}_deps=\"$lib_deps\" >> $TMPH
done

cp_if_changed $TMPH ffbuild/config.sh