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

• https://stackoverflow.com/questions/70496497/cmake-why-openmp-is-not-found-by-clang