openmp issue on macmini #1467
Description
from #1459 ...
Openmp curiously is no longer able to be found during TPL builds. This may be related to Spack updates, but its more likely that I need to update xcode or something. Example of error when building camp:
1 error found in build log:
...
25 -- Creating BLT OpenMP targets...
>> 26 CMake Error at /Applications/CMake.app/Contents/share/cmake-3.23/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
27 Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES)
...
After doing some investigating it seems the internet recommends brew install libomp. However, Spack doesn't really like that, given Spack randomly adds -lgomp to all TPLs:
- tfpgb2s ^[email protected] fflags=-fPIC ldflags=-L/opt/homebrew/opt/libomp/lib ldlibs='-lgomp' ...
My guess as to why openmp could be found previously is that Spack found gomp, a GCC-openmp, located in /opt/homebrew/lib/gcc/15. But all the sudden it can't find it anymore(?). Alternatively, something internal to xcode was helping us find openmp..
I'll try updating my version of xcode on the macmini, but if that doesn't work we may need to reach out to some Spack people.