ffmpeg下编译tsan

如何在ffmpeg下编译tsan，如下配置：

./configure \
    --prefix=/workspace/ffmpeg_gcu \
    --disable-stripping \
    --disable-optimizations \
    --disable-x86asm \
    --toolchain=gcc-tsan \
    --enable-pic \
    --enable-swscale \
    --enable-static \
    --enable-shared 

结果出现下面错误，提示找不到libtsan_preinit.o：

BEGIN /tmp/ffconf.l64ruLdY/test.c
    1	int main(void){ return 0; }
END /tmp/ffconf.l64ruLdY/test.c
gcc -fsanitize=thread -fPIC -g0 -O3 -DNDEBUG -Wl,--build-id -c -o /tmp/ffconf.l64ruLdY/test.o /tmp/ffconf.l64ruLdY/test.c
gcc -fuse-ld=gold -ldl -lpthread -Wl,--build-id -fsanitize=thread -fPIC -o /tmp/ffconf.l64ruLdY/test /tmp/ffconf.l64ruLdY/test.o
/usr/bin/ld.gold: error: cannot open libtsan_preinit.o: No such file or directory
collect2: error: ld returned 1 exit status
C compiler test failed.

安装tsan,并且测试

# 安装
$ apt-get install libtsan0 libtsan-dev

# 测试
$ echo "int main(){return 0;}" | gcc -x c -fsanitize=thread - -o /dev/null
/usr/bin/ld: cannot find libtsan_preinit.o: No such file or directory
collect2: error: ld returned 1 exit status

寻找：

# 查找
$ find /usr -name "libtsan_preinit.o"
/usr/aarch64-linux-gnu/lib/libtsan_preinit.o

# 查看机器类型
$ gcc -dumpmachine
x86_64-linux-gnu

后来才知道libtsan0:aarch64-linux-gnu 是 aarch64 版本的 TSAN 库。

解决方案：
把上面的--toolchain=gcc-tsan \替换为--toolchain=clang-tsan \