[Mesa-dev] [Bug 92629] lp_bld_debug.cpp:141: undefined reference to `llvm::sys::getProcessTriple()'

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92629

Jose Fonseca <jfonseca at vmware.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #1 from Jose Fonseca <jfonseca at vmware.com> ---
Thanks Vinson.

I can repro this on Ubuntu 15.10 doing

  CC=clang CXX=clang++ scons lp_test_arit

If I do

  nm -u build/linux-x86_64-debug/gallium/auxiliary/gallivm/lp_bld_debug.os

with G++ I get

  U _ZN4llvm3sys16getProcessTripleB5cxx11Ev

where as with Clang I get

  _ZN4llvm3sys16getProcessTripleEv

If I run both through c++filt I get with g++

  U llvm::sys::getProcessTriple[abi:cxx11]()

whereas with clang I get

  U llvm::sys::getProcessTriple()

In other words, clang is not emitting cxx11 abi symbols, when g++ is.

This seems to be a known problem:

  http://allanmcrae.com/2015/06/the-case-of-gcc-5-1-and-the-two-c-abis/
 
https://www.reddit.com/r/cpp/comments/3b2glr/why_clang_cant_use_the_new_gcc_5_cxx11_abi/

And there's even a LLVM/clang bug filed:

  https://llvm.org/bugs/show_bug.cgi?id=23529

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