```

pg:~/1/contrib/tools/yasm ya make -r --target-platform=default-freebsd-x86_64
Ok
```
commit_hash:d44f7e6e2ed31611ad352069a9289f448f29632a

5 files changed, 34 insertions, 4 deletions

diff --git a/build/conf/linkers/ld.conf b/build/conf/linkers/ld.conf
index ab172b1aac0..9f732877462 100644
--- a/build/conf/linkers/ld.conf
+++ b/build/conf/linkers/ld.conf
@@ -96,7 +96,7 @@ elsewhen ($OS_ANDROID == "yes") {
         _LD_USE_STDLIB=-nostdlib++
     }
 }
-elsewhen ($OS_LINUX == "yes" || $OS_DARWIN == "yes" || $OS_IOS == "yes") {
+elsewhen ($OS_LINUX == "yes" || $OS_DARWIN == "yes" || $OS_IOS == "yes" || $OS_FREEBSD == "yes") {
     _LD_USE_STDLIB=-nodefaultlibs
 }
 
diff --git a/build/platform/lld/ya.make b/build/platform/lld/ya.make
index 79536a33b50..568b9c652f1 100644
--- a/build/platform/lld/ya.make
+++ b/build/platform/lld/ya.make
@@ -48,6 +48,11 @@ ELSEIF (OS_LINUX)
         # add build-id to binaries to allow external tools check equality of binaries
         -Wl,--build-id=sha1
     )
+ELSEIF (OS_FREEBSD)
+    LDFLAGS(
+        -fuse-ld=lld
+        --ld-path=${LLD_ROOT_RESOURCE_GLOBAL}/bin/ld.lld
+    )
 ELSEIF (OS_DARWIN OR OS_IOS)
     LDFLAGS(
         -fuse-ld=lld
diff --git a/build/ymake.core.conf b/build/ymake.core.conf
index 97b5a3243e2..313ede55843 100644
--- a/build/ymake.core.conf
+++ b/build/ymake.core.conf
@@ -382,6 +382,11 @@ when ($OS_DARWIN == "yes") {
 }
 
 # tag:allocator
+when ($OS_FREEBSD == "yes") {
+    DEFAULT_ALLOCATOR=SYSTEM
+}
+
+# tag:allocator
 when ($OS_LINUX == "yes") {
     when ($GCC) {
         # tcmalloc broken build
diff --git a/build/ymake_conf.py b/build/ymake_conf.py
index 33b80f5ec2d..14b1a188e4b 100755
--- a/build/ymake_conf.py
+++ b/build/ymake_conf.py
@@ -160,6 +160,9 @@ class Platform(object):
         assert self.is_32_bit or self.is_64_bit
         assert not (self.is_32_bit and self.is_64_bit)
 
+        self.is_freebsd = self.os == 'freebsd'
+        self.is_freebsd_x86_64 = self.is_freebsd and self.is_x86_64
+
         self.is_linux = self.os == 'linux' or 'yocto' in self.os
         self.is_linux_x86_64 = self.is_linux and self.is_x86_64
         self.is_linux_armv8 = self.is_linux and self.is_armv8
@@ -187,7 +190,7 @@ class Platform(object):
 
         self.is_none = self.os == 'none'
 
-        self.is_posix = self.is_linux or self.is_apple or self.is_android or self.is_yocto
+        self.is_posix = self.is_linux or self.is_apple or self.is_android or self.is_yocto or self.is_freebsd
 
     @staticmethod
     def from_json(data):
@@ -207,9 +210,14 @@ class Platform(object):
             yield 'LINUX'
             yield 'OS_LINUX'
 
+        if self.is_freebsd:
+            yield 'FREEBSD'
+            yield 'OS_FREEBSD'
+
         if self.is_macos:
             yield 'DARWIN'
             yield 'OS_DARWIN'
+
         if self.is_iossim:
             yield 'IOS'
             yield 'OS_IOS'
@@ -1193,6 +1201,8 @@ class GnuToolchain(Toolchain):
             target_triple = self.tc.triplet_opt.get(target.arch, None)
             if not target_triple:
                 target_triple = select(default=None, selectors=[
+                    (target.is_freebsd and target.is_x86_64, 'x86_64-freebsd-unknown'),
+
                     (target.is_linux and target.is_x86_64, 'x86_64-linux-gnu'),
                     (target.is_linux and target.is_armv8, 'aarch64-linux-gnu'),
                     (target.is_linux and target.is_armv6 and target.armv6_float_abi == 'hard', 'armv6-linux-gnueabihf'),
@@ -1306,6 +1316,9 @@ class GnuToolchain(Toolchain):
             if target.is_apple:
                 self.setup_apple_sdk(target)
 
+            if target.is_freebsd:
+                self.setup_freebsd_sdk_impl(project='build/internal/platform/freebsd', var='${FREEBSD_SDK_RESOURCE_GLOBAL}')
+
             if self.tc.is_from_arcadia or self.tc.is_system_cxx:
                 if target.is_linux:
                     if not tc.os_sdk_local:
@@ -1324,6 +1337,11 @@ class GnuToolchain(Toolchain):
                 if target.is_yocto:
                     self.setup_sdk(project='build/platform/yocto_sdk/yocto_sdk', var='${YOCTO_SDK_ROOT_RESOURCE_GLOBAL}')
 
+    def setup_freebsd_sdk_impl(self, project, var):
+        self.platform_projects.append(project)
+        self.c_flags_platform.append('--sysroot')
+        self.c_flags_platform.append(var)
+
     def setup_apple_sdk(self, target):
         if not self.tc.os_sdk_local:
             self.setup_apple_arcadia_sdk(target)
@@ -1640,7 +1658,7 @@ class Linker(object):
             # Android toolchain is NDK, LLD works on all supported platforms
             return Linker.LLD
 
-        elif self.build.target.is_linux or self.build.target.is_macos or self.build.target.is_ios or self.build.target.is_wasm:
+        elif self.build.target.is_linux or self.build.target.is_macos or self.build.target.is_ios or self.build.target.is_wasm or self.build.target.is_freebsd:
             return Linker.LLD
 
         # There is no linker choice on Windows (link.exe)
@@ -1703,6 +1721,8 @@ class LD(Linker):
 
         if self.musl.value:
             self.ld_flags.extend(['-Wl,--no-as-needed'])
+        elif target.is_freebsd:
+            self.ld_flags.extend(['-lc', '-lm', '-lpthread', '-Wl,--no-as-needed'])
         elif target.is_linux:
             self.ld_flags.extend(['-ldl', '-lrt', '-Wl,--no-as-needed'])
             if self.tc.is_gcc:
diff --git a/contrib/libs/cxxsupp/libcxx/ya.make b/contrib/libs/cxxsupp/libcxx/ya.make
index f79aff9a161..5b56e018e25 100644
--- a/contrib/libs/cxxsupp/libcxx/ya.make
+++ b/contrib/libs/cxxsupp/libcxx/ya.make
@@ -33,7 +33,7 @@ ELSEIF (OS_IOS)
     PEERDIR(
         contrib/libs/cxxsupp/builtins
     )
-ELSEIF (OS_LINUX OR OS_DARWIN)
+ELSEIF (OS_LINUX OR OS_DARWIN OR OS_FREEBSD)
     IF (ARCH_ARM6 OR ARCH_ARM7)
         # libcxxrt support for ARM is currently broken, use libcxxabi instead
         SET(CXX_RT "libcxxabi")