GOMP_parallel_start

[alexm98]

Hello everyone, I am writing a formula for GRASS GIS.
In order to compile with OpenMP support, the software requires GOMP_parallel_start which is not found in libomp

A hack that I found to be able to do this is use includes from libomp but use GCC libs which include GOMP_parallel_start

"--with-openmp-includes=#{Formula["libomp"].opt_include}",
"--with-openmp-libs=#{Formula["gcc"].opt_lib}/gcc/current",

Needless to say, this is not a good idea. If I instead try to use the openmp-libs found in libomp:

"--with-openmp-libs=#{Formula["libomp"].opt_lib}",

I get the following message:

checking whether to use OpenMP... "yes"
checking for location of OpenMP includes... /opt/homebrew/opt/libomp/include
checking omp.h usability... yes
checking omp.h presence... yes
checking for omp.h... yes
checking for location of OpenMP library... /opt/homebrew/opt/libomp/lib
checking for GOMP_parallel_start... no
checking for GOMP_parallel_start in -lgomp... no
configure: error: *** Unable to locate OpenMP library.

What is a viable workaround for my formula that I could use? There does not seem to be a libgomp in homebrew-core.

[carlocab]

libgomp is provided by GCC, that's why this flag works:

"--with-openmp-libs=#{Formula["gcc"].opt_lib}/gcc/current"

You can use GCC's OpenMP implementation, but you should also use the matching headers that come with GCC.