Cilksan missing functions: __csan_fstat64 and __csan_cabs

[ProExpertProg]

Describe the bug

When linking a Cilksan program that uses functions std::abs and fstat64, the following errors appear:

/usr/bin/ld: CMakeFiles/src-lib.dir/lib/Naive.cpp.o: in function `operator()':
/home/luka/clion/adaptive-hermite-refinement/cpp/lib/Naive.cpp:279: undefined reference to `__csan_cabs'
/usr/bin/ld: _deps/spdlog-build/libspdlog.a(spdlog.cpp.o): in function `spdlog::details::os::filesize(_IO_FILE*)':
/home/luka/clion/adaptive-hermite-refinement/cpp/cmake-build-release-cilksan/_deps/spdlog-src/include/spdlog/details/os-inl.h:229: undefined reference to `__csan_fstat64'
clang-14: error: linker command failed with exit code 1 (use -v to see invocation)

Expected behavior

I expected linking to succeed.

OpenCilk version

• Release version: 2.0
• Distribution method: .sh archive

System information

• OS: WSL 2.0: Ubuntu 22.04
• CPU: 11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz

Steps to reproduce (include relevant output)

1. Put this into cilksan-bug.cpp

#include <iostream>
#include <sys/stat.h>
#include <complex>

int main() {
  std::cout << std::abs(std::complex<double>(1.0, 2.0)) << std::endl;
  struct stat64 buf;
  ::fstat64(0, &buf);
  std::cout << buf.st_dev << std::endl;
}

3. Build with -fopencilk -fsanitize=cilk

clang++ -fopencilk -fsanitize=cilk cilksan-bug.cpp

Other notes

I'll try this on 2.1 tomorrow

[ProExpertProg]

Update: The beta workaround (passing -mllvm -cilksan-bc-path) seemed to work. I'll leave the issue open, as I assume it should still be fixed.

[ProExpertProg]

Still an issue with 2.1. The beta workaround does not work there, as the compiler crashes (#291)

[neboat]

Closing this issue, which should be fixed by PR OpenCilk/productivity-tools#49.