[LLVMdev] C++0x Bug in CMake?

[Chandler Carruth]

Maybe, I'll have to debug. It does seem quite bizarre.


On Tue, Jan 21, 2014 at 10:03 AM, Renato Golin <renato.golin at linaro.org>wrote:

> Chandler,
>
> I may be doing this wrong, but I'm getting a weird error in building LLVM
> with Clang via CMake.
>
> On x86_64:
> $ CC=clang CXX=clang++ cmake -G Ninja ../../src/llvm
> -DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_TESTS=True
> -DLLVM_ENABLE_ASSERTIONS=True
>
> On ARM:
> $ CC=clang CXX=clang++ cmake -G Ninja ../src/ -DCMAKE_BUILD_TYPE=Release
> -DCMAKE_INSTALL_PREFIX=../install -DCMAKE_C_FLAGS=-mcpu=cortex-a15
> -DCMAKE_CXX_FLAGS=-mcpu=cortex-a15 -DLLVM_TARGETS_TO_BUILD=ARM
> -DLLVM_BUILD_TESTS=True -DLLVM_ENABLE_ASSERTIONS=True
>
> Warning:
> CMake Warning at cmake/modules/HandleLLVMOptions.cmake:117 (message):
>   -fPIC is not supported.
> Call Stack (most recent call first):
>   cmake/modules/HandleLLVMOptions.cmake:150 (add_flag_or_print_warning)
>   CMakeLists.txt:286 (include)
>
> Error log:
> Run Build Command:/usr/local/bin/ninja cmTryCompileExec3815591925
> [1/2] Building C object CMakeFiles/cmTryCompileExec3815591925.dir/src.c.o
> FAILED: /home/user/devel/llvm/build/bin/clang   -mcpu=cortex-a15
>  -DC_SUPPORTS_FLAG -std=c++0x   -fPIC -o
> CMakeFiles/cmTryCompileExec3815591925.dir/src.c.o   -c src.c
> error: invalid argument '-std=c++0x' not allowed with 'C/ObjC'
> ninja: build stopped: subcommand failed.
>
> Why is it adding --std=c++0x on a C compiler?
>
> Needless to say that with GCC, that doesn't happen (ie. --std=c++0x
> doesn't get added). Happens both on ARM and x86_64.
>
> Is this a side effect of your changes?
>
> cheers,
> --renato
>
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