I’m currently trying to build (and use) libc++ in various configurations (with enabled tsan, with enabled msan, with enabled debug mode, etc.). Since some of them have ABI implications and compiler-r/the sanitizers depend on libc++ I assumed it is best to build all of libunwind, libc++abi, libc++ and compiler-rt with the same configuration to avoid ABI issues.
I’ve thus first built clang, lld and the compiler-rt builtins + crt (no runtimes) as a bootstrap build and installed them to /opt/clang. I then built libunwind, libc++abi, libc++ and the sanitizers with the clang from /opt/clang and installed them to a subdirectory of /opt/clang-runtimes/ (e.g. /opt/clang-runtimes/debug, /opt/clang-runtimes/tsan, …)
I’m now able to compile, link and run a test executable with the correct version of libc++ by using the flags described at Using libc++ — libc++ documentation. However, once I add any of the sanitizer flags (e.g. -fsanitize=address), clang does complain that it can’t find the sanitizer libs:
/opt/clang/bin/clang++ -nostdinc++ -isystem /opt/clang-runtimes/debug/include/c++/v1 -m64 -stdlib=libc++ -O3 -DNDEBUG -m64 -fuse-ld=lld -nostdlib++ -L /opt/clang-runtimes/debug/lib -L/opt/clang-runtimes/debug/lib/linux -Wl,-rpath,/opt/clang-runtimes/debug/lib -lc++ -unwindlib=libunwind -fuse-ld=lld -fsanitize=address CMakeFiles/test.dir/src/main.cpp.o -o test: clang-15: warning: argument unused during compilation: '-nostdinc++' [-Wunused-command-line-argument] ld.lld: error: cannot open /opt/clang/lib/clang/15.0.7/lib/linux/libclang_rt.asan_static-x86_64.a: No such file or directory ld.lld: error: cannot open /opt/clang/lib/clang/15.0.7/lib/linux/libclang_rt.asan-x86_64.a: No such file or directory ld.lld: error: cannot open /opt/clang/lib/clang/15.0.7/lib/linux/libclang_rt.asan_cxx-x86_64.a: No such file or directory clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
This obviously fails because the sanitizers aren’t installed in that directory. I had hoped that
-L/opt/clang-runtimes/debug/lib/linux would be sufficient for clang to find the libs, but apparently it uses some hard-coded absolute path. Is there a way to tell clang to look for the sanitizer libs in
Thanks for your help