CMake Can't find Open MP on M2 mac

Question

CMake Can't find Open MP on M2 mac

Closed this issue a year ago · 2 comments

We added this to CMakeLists.txt

SET (TRGT spatter)
SET( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Xclang -fopenmp")
SET (OpenMP_C_FLAGS "-Xclang -fopenmp -I/opt/homebrew/Cellar/libomp/15.0.6/include -L/opt/homebrew/Cellar/libomp/15.0.6/lib")
SET (OpenMP_C_LIB_NAMES "libomp")
SET (OpenMP_libomp_LIBRARY "omp")
SET (OpenMP_CXX_FLAGS "-Xclang -fopenmp -I/opt/homebrew/Cellar/libomp/15.0.6/include -L/opt/homebrew/Cellar/libomp/15.0.6/lib")
SET (OpenMP_CXX_LIB_NAMES "libomp")
SET (LDFLAGS "${LDFLAGS} -L/opt/homebrew/Cellar/libomp/15.0.6/lib")

Answer 1 · 2023-01-27T18:43:44.000Z

I think this may be fixed check that we are properly using FindOpenMP https://cmake.org/cmake/help/v3.20/module /FindOpenMP.html in our CMakeLists.txt.

I'm going to tag this under our CMake improvements branch of things but it may be a bug related to M2's OpenMP implementation.

Answer 2 · 2023-06-03T17:47:00.000Z

There have been reports of CMake not being able to find OpenMP on Mac. This issue has been noted on the README, and users are encouraged to use a Linux container, as implementing a solution for it can be overly hacky (installing OpenMP from source, which needs a full installation of XCode).