[all-commits] [llvm/llvm-project] 867a1d: [sanitizer_common] mark __elf_aux_vector as weak o...

[Dimitry Andric via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 867a1d621d1c6146dc29fa6b471407327d8f1bff
      https://github.com/llvm/llvm-project/commit/867a1d621d1c6146dc29fa6b471407327d8f1bff
  Author: Dimitry Andric <dimitry at andric.com>
  Date:   2024-12-03 (Tue, 03 Dec 2024)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp

  Log Message:
  -----------
  [sanitizer_common] mark __elf_aux_vector as weak on FreeBSD (#118110)

At some point FreeBSD introduced libsys as a wrapper between syscalls
and libc, and then linking sanitized programs started failing with:

```text
  # c++ -fsanitize=address main.cc
  ld: error: undefined symbol: __elf_aux_vector
  >>> referenced by sanitizer_linux_libcdep.cpp:950 (/usr/src/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp:950)
  >>>               sanitizer_linux_libcdep.o:(__sanitizer::ReExec()) in archive /usr/lib/clang/17/lib/freebsd/libclang_rt.asan-x86_64.a
  c++: error: linker command failed with exit code 1 (use -v to see invocation)
```

Mark `__elf_aux_vector` as weak in the internal sanitizer declaration,
so the linker will accept it at link time. The dynamic linker will then
take care of the symbol at run time.



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