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Why OpenMP is not found by Clang

#IT/Issues28
AI-generated summary
When using Clang as the C++ compiler, CMake may fail to find OpenMP, resulting in an error message about missing OpenMP_CXX flags and libraries. The solution is to use the flag `-fopenmp=libomp` with Clang. Alternatively, switching to the g++ compiler can be done with the command: `cmake .. -DCMAKE_C_COMPILER=which gcc -DCMAKE_CXX_COMPILER=which g++`.

Why OpenMP is not Found by Clang#

当使用 clang 作为 C++ 编译器时，CMAKE 无法找到 OpenMP, 如下：

[cmake] -- Could NOT find OpenMP_CXX (missing: OpenMP_CXX_FLAGS OpenMP_CXX_LIB_NAMES)

Solution#

  1. When using Clang with OpenMP you need to use -fopenmp=libomp
  2. 切换 C++ 编译器为 g++, cmake .. -DCMAKE_C_COMPILER=which gcc -DCMAKE_CXX_COMPILER=which g++

Refs#

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