From https://build.chromium.org/p/chromium.fyi/builders/ClangToTLinuxASan/builds/7540


[2025/45231] LINK ./sel_ldr
FAILED: sel_ldr 
python "../../build/toolchain/gcc_link_wrapper.py" --output="./sel_ldr" -- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -pie -Wl,--fatal-warnings -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -fuse-ld=gold -B../../third_party/binutils/Linux_x64/Release/bin -Wl,--threads -Wl,--thread-count=4 -m64 -Werror -Wl,-O1 -Wl,--gc-sections --sysroot=../../build/linux/debian_jessie_amd64-sysroot -L../../build/linux/debian_jessie_amd64-sysroot/lib/x86_64-linux-gnu -Wl,-rpath-link=../../build/linux/debian_jessie_amd64-sysroot/lib/x86_64-linux-gnu -L../../build/linux/debian_jessie_amd64-sysroot/usr/lib/x86_64-linux-gnu -Wl,-rpath-link=../../build/linux/debian_jessie_amd64-sysroot/usr/lib/x86_64-linux-gnu -fsanitize=address -fsanitize-address-use-after-scope -fsanitize=leak -Wl,-rpath-link=. -Wl,--disable-new-dtags -Wl,-rpath=\$ORIGIN/. -Wl,-rpath-link=. -Wl,-u_sanitizer_options_link_helper -fsanitize=address -fsanitize-address-use-after-scope -fsanitize=leak -nodefaultlibs -Wl,-rpath,\$ORIGIN/ -L. -o "./sel_ldr" -Wl,--start-group @"./sel_ldr.rsp" ./libc++.so -Wl,--end-group   -lrt -lc -lm -lgcc_s 
../../native_client/src/trusted/service_runtime/linux/thread_suspension.c:272: error: undefined reference to 'pthread_kill'
../../native_client/src/shared/platform/posix/nacl_host_desc.c:177: error: undefined reference to 'pthread_once'
../../native_client/src/shared/platform/posix/nacl_host_desc.c:177: error: undefined reference to 'pthread_once'
../../native_client/src/shared/platform/posix/nacl_threads.c:56: error: undefined reference to 'pthread_attr_setstacksize'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/asan/asan_linux.cc:172: error: undefined reference to 'dlsym'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/asan/asan_posix.cc:98: error: undefined reference to 'pthread_key_create'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/asan/asan_posix.cc:115: error: undefined reference to 'pthread_setspecific'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/asan/asan_posix.cc:103: error: undefined reference to 'pthread_getspecific'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/asan/asan_posix.cc:108: error: undefined reference to 'pthread_setspecific'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/interception/interception_linux.cc:23: error: undefined reference to 'dlsym'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/interception/interception_linux.cc:29: error: undefined reference to 'dlvsym'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:110: error: undefined reference to 'pthread_getattr_np'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:123: error: undefined reference to 'dlsym'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:169: error: undefined reference to 'dlsym'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc:355: error: undefined reference to 'pthread_attr_setstacksize'
/b/c/builder/ClangToTLinuxASan/src/third_party/llvm/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc:355: error: undefined reference to 'pthread_attr_setstacksize'
clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)