[llvm-dev] ABI breaking check magic breaks check_include_cxx_file() in CMake

[Mehdi Amini via llvm-dev]

Hi,

> On Jan 28, 2017, at 1:26 AM, Michał Górny via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi,
> 
> I've just discovered that with LLVM 4.0, LightSpark suddenly fails to
> find all LLVM include files. I've looked into it, and it seems that
> CMake is doing the very smart thing of attempting to link the test
> applications using the tested includes, and this fails with:
> 
> /usr/bin/c++        CMakeFiles/cmTC_cd252.dir/CheckIncludeFile.cxx.o  -o cmTC_cd252 -rdynamic 
> CMakeFiles/cmTC_cd252.dir/CheckIncludeFile.cxx.o:(.data+0x0): undefined reference to `llvm::DisableABIBreakingChecks'
> collect2: error: ld returned 1 exit status
> 
> I've reported this upstream at [1]. However, do you have any idea how
> we could work around the problem on our end before CMake is fixed
> and all users upgrade it?

You can build LLVM with -DLLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING=OFF

— 
Mehdi


> 
> [1]:https://gitlab.kitware.com/cmake/cmake/issues/16606
> 
> -- 
> Best regards,
> Michał Górny
> <http://dev.gentoo.org/~mgorny/>
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