[llvm-dev] LLVM cross compilation for arm target

[Balasaheb Dabhade via llvm-dev]

Thanks James for your help!!

libstdc++4.7 issue has been been resolved  after adding
-DLLVM_ENABLE_LIBCXX=ON option in cmake commands but it now it showing
below error :

Error :
 * Host compiler must support std::atomic!*
Call Stack (most recent call first):
  cmake/config-ix.cmake:301 (include)
  CMakeLists.txt:412 (include)

Does anyone know how to resolve this issue?

Thanks,
Bala

On Thu, May 5, 2016 at 3:55 PM, James Molloy <james at jamesmolloy.co.uk>
wrote:

> Hi Bala,
>
> Without more information it'll be difficult to debug. What I would do is
> look at the CMake error log file. That will tell you the exact program it
> tried to run to determine if the host compiler could find libstdc++, and
> the  error it got. From there, it should be easier to determine what the
> actual problem was.
>
> Cheers,
>
> James
>
> On Thu, 5 May 2016 at 11:20 Balasaheb Dabhade via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hello All,
>>
>> I am building llvm-clang tool chain for *arm target* by following the
>> steps from
>> http://clang.llvm.org/docs/CrossCompilation.html
>>
>> *However when I tried following cmake command for build tool chain it
>> gives the error message :*
>>
>> #CC='clang' CXX='clang++' cmake -G Ninja /home/iiita/llvm-exp/llvm
>> -DCMAKE_CROSSCOMPILING=True
>> -DCMAKE_INSTALL_PREFIX=/home/iiita/llvm-exp/llvm/build
>> -DLLVM_TABLEGEN=/usr/bin/host/llvm-tblgen
>> -DCLANG_TABLEGEN=/usr/bin/host/clang-tblgen
>> -DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf -DLLVM_TARGET_ARCH=ARM
>> -DLLVM_TARGETS_TO_BUILD=ARM -DCMAKE_CXX_FLAGS='-target
>> armv7a-linux-gnueabihf -mcpu=cortex-a9
>> -I/usr/arm-linux-gnueabihf/include/c++/4.7.1/arm-linux-gnueabihf/
>> -I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard -ccc-gcc-name
>> arm-linux-gnueabihf-gcc'
>>
>>
>> *error :*
>>
>> CMake Error at cmake/modules/CheckCompilerVersion.cmake:38 (message):
>>   Host Clang must be able to find libstdc++4.7 or newer!
>> Call Stack (most recent call first):
>>   cmake/config-ix.cmake:14 (include)
>>   CMakeLists.txt:412 (include)
>>
>> I have installed libstdc++4.7-dev library but still same issue is coming.
>>
>> Does anyone know how to resolve this issue?
>>
>> Thanks,
>> Bala
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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