Hi, The latest Clang-6.0 compiler finally enables OpenMP by default on Linux (e.g. Ubuntu-18 x86_64).
But OpenMP programs using Clang-6.0/CMake-3.10 fail to compile: [100%] Linking CXX executable primecount libprimecount.a(P2.cpp.o): In function `.omp_outlined..7': P2.cpp:(.text+0x2194): undefined reference to `__atomic_load' P2.cpp:(.text+0x21ef): undefined reference to `__atomic_compare_exchange' CMakeFiles/primecount.dir/build.make:148: recipe for target 'primecount' failed make[2]: *** [primecount] Error 1 The problem is that: target_link_libraries(myprogram OpenMP::OpenMP_CXX) does not add libatomic to the linker options which LLVM/Clang's OpenMP library depends upon. When I manually add -latomic to the linker options my OpenMP programs compile & link fine using Clang-6.0/CMake-3.10. Regards, Kim
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