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set(_GNU_MARCH_C_CXX_FLAGS "")
if (CMAKE_SYSTEM_PROCESSOR MATCHES "^(i686|x86_64|AMD64)$")
if (CMAKE_SYSTEM_PROCESSOR STREQUAL "i686")
string(APPEND _GNU_MARCH_C_CXX_FLAGS " -m32")
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|AMD64)$")
string(APPEND _GNU_MARCH_C_CXX_FLAGS " -m64")
endif()
string(APPEND _GNU_MARCH_C_CXX_FLAGS "\
-msse2 \
-msse3 \
-mssse3 \
")
if ((CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|AMD64)$") OR (NOT ANDROID))
string(APPEND _GNU_MARCH_C_CXX_FLAGS "\
-msse4.1 \
-msse4.2 \
-mpopcnt \
")
if (NOT ANDROID)
# older clang versions did not support this feature on Android:
# https://reviews.llvm.org/rGc32d307a49f5255602e7543e64e6c38a7f536abc
string(APPEND _GNU_MARCH_C_CXX_FLAGS " -mcx16")
endif()
endif()
if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
string(APPEND _GNU_MARCH_C_CXX_FLAGS " -D_YNDX_LIBUNWIND_ENABLE_EXCEPTION_BACKTRACE")
endif()
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm64|aarch64)$")
if (CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux)$")
# Clang 13+ generates outline atomics by default if '-rtlib=compiler_rt' is specified or system's
# libgcc version is >= 9.3.1 : https://github.com/llvm/llvm-project/commit/c5e7e649d537067dec7111f3de1430d0fc8a4d11
# Disable this behaviour because our build links with contrib/libs/cxxsupp/builtins that does not contain outline atomics yet
string(APPEND _GNU_MARCH_C_CXX_FLAGS " -mno-outline-atomics")
endif()
elseif (ANDROID AND (CMAKE_ANDROID_ARCH_ABI STREQUAL "armeabi-v7a"))
string(APPEND _GNU_MARCH_C_CXX_FLAGS " -mfloat-abi=softfp")
endif()
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