[all-commits] [llvm/llvm-project] 2c7cdf: [sanitizer_common] mark __elf_aux_vector as weak o...

[Dimitry Andric via All-commits]

  Branch: refs/heads/users/DimitryAndric/fix-freebsd-elf-aux-vector-1
  Home:   https://github.com/llvm/llvm-project
  Commit: 2c7cdfda38e692f0a0e1793de5d6c6db1d6c9212
      https://github.com/llvm/llvm-project/commit/2c7cdfda38e692f0a0e1793de5d6c6db1d6c9212
  Author: Dimitry Andric <dimitry at andric.com>
  Date:   2024-11-29 (Fri, 29 Nov 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

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

  # 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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