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

[Chandler Carruth]

Never mind, I see the bug. Working on a fix.


On Tue, Jan 21, 2014 at 10:07 AM, Chandler Carruth <chandlerc at gmail.com>wrote:

> Which version of CMake?
>
>
> On Tue, Jan 21, 2014 at 10:06 AM, Chandler Carruth <chandlerc at gmail.com>wrote:
>
>> 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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>>>
>>>
>>
>
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