Hi All,
I am building llvm-clang cross tool chain for arm target and getting below error message when I tried to execute below command :
Command :
#CC=‘clang’ CXX=‘clang++’ cmake -G Ninja /home/iiita/crossbuild/llvm -DLLVM_ENABLE_LIBCXX=ON -DCMAKE_CROSSCOMPILING=True -DCMAKE_INSTALL_PREFIX=/home/iiita/crossbuild/build -DLLVM_TABLEGEN=/home/iiita/llvm-3.8/build/bin/llvm-tblgen -DCLANG_TABLEGEN=/home/iiita/llvm-3.8/build/bin/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++/4.7.3/arm-linux-gnueabihf/ -I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard -ccc-gcc-name arm-linux-gnueabihf-gcc’
Error message :
– Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Failed
– Looking for __atomic_fetch_add_4 in atomic
– Looking for __atomic_fetch_add_4 in atomic - found
– Performing Test HAVE_CXX_ATOMICS_WITH_LIB
– Performing Test HAVE_CXX_ATOMICS_WITH_LIB - Failed
CMake Error at cmake/modules/CheckAtomic.cmake:33 (message):
Host compiler must support std::atomic!
Call Stack (most recent call first):
cmake/config-ix.cmake:296 (include)
CMakeLists.txt:407 (include)
– Configuring incomplete, errors occurred!
See also “/home/iiita/crossbuild/build/CMakeFiles/CMakeOutput.log”.
See also “/home/iiita/crossbuild/build/CMakeFiles/CMakeError.log”.
Does this build issue because of external library not installed or LLVM itself has issue with arm support?
Thanks,
Bala