[llvm-dev] CMake Cache PGO error

[Vedant Kumar via llvm-dev]

Haven't given the PGO cache file a shot, but I ran into a similar problem today, and solved the issue by making sure that my host compiler had access to a working copy of the profiling runtime.

For me, that's: ninja libclang_rt.profile_osx.a

If that's not your issue, try checking the CMake{Error,Output}.log files, and figure out why exactly the check is failing (most likely it has nothing to do with the "c++11 unsupported" error message).

vedant

> On Mar 15, 2017, at 3:09 PM, Timo Janssen via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> I was trying to build llvm + clang with cmake cache PGO.cmake and ninja stage2. I used the 4.0.0 final tag vfrom svn. 
> 
> This seems to work for me.
> 
> I added libcxx, libcxxabi, llld etc. 
> 
> And now I get the following cmake error.
> 
> -- Performing Test LIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG
> -- Performing Test LIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG - Failed
> CMake Error at projects/libcxx/CMakeLists.txt:396 (message):
>   C++11 or greater is required but the compiler does not support c++11
> 
> I don't understand the error. Why shouldn't the cxx11 flag work.
> 
> I only use cmake -GNInja -C path/to//PGO.cmake  path/to/llvm.
> 
> 
> So my Question is if the cache file are still maintained. And if I shouldn't compile libcxx and the others with this cache file?
> 
> Thanks
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