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

[Chandler Carruth]

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
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20140121/2fcd61e0/attachment.html>