Added the option im_enable_openmp to compile the library with the openmp flag

What is the new feature

The library now compiles OpenMP codes even when the OpenMP flag is not added manually in CMAKE_Fortran_FLAGS

How is it implemented

Added the option IM_ENABLE_OPENMP, checked whether OpenMP is available as a package and added the flags in the existing Fortran_FLAGS

Mandatory steps before review

• Gitlab CI passes (Hint: use make format for linting)
• New feature is covered by additional unit tests
• Mark the merge request as ready by removing Draft:

Mandatory steps before merge

• Reviewed by a maintainer
• Incorporate review suggestions
• Prior to merging, please remove any boilerplate from the MR description, retaining only the Please describe your feature in a couple of words and describe important implementation details of the feature section to maintain

You are not supposed to merge this request by yourself, the maintainers of libiconmath take care of this action!

assigned to @k202170

added 1 commit

• 195b00d9 - fix: changed the default of enable_openmp to OFF

Compare with previous version

added 1 commit

• 91d2e344 - build: checking whether the openmp macro is already defined

Compare with previous version

added 8 commits

• 4fb7d3c3 - 1 commit from branch main
• f70a844e - build: enabled compilation with openmp
• 5135a233 - fix: a bug was fixed in mo_lib_divrot to use openmp enabling
• fe7b92bb - ci: added a test to check openmp enabling
• 154ab3c3 - ci: fixed a bug introduced in the last commit
• 619ea3ef - ci: added an additional test to check openmp enabling for an intel compiler
• e5c56e2d - fix: changed the default of enable_openmp to OFF
• d424c62f - build: checking whether the openmp macro is already defined

Compare with previous version

added ready for review label

requested review from @b382190

added 9 commits

• edcf8545 - 1 commit from branch main
• 1fc65769 - build: enabled compilation with openmp
• e7e620f3 - fix: a bug was fixed in mo_lib_divrot to use openmp enabling
• bd598bb2 - ci: added a test to check openmp enabling
• f5f5b074 - ci: fixed a bug introduced in the last commit
• 8b7781fa - ci: added an additional test to check openmp enabling for an intel compiler
• 328c4151 - fix: changed the default of enable_openmp to OFF
• 2ee46826 - build: checking whether the openmp macro is already defined
• 9f4e65cd - ci: replaced the remaining levante-fake with levante

Compare with previous version

requested changes

added 2 commits

• 9742011f - ci: changed the name of the stage in CI related to openmp
• 88718789 - build: removed the strict requirement while finding the package OpenMP

Compare with previous version

requested review from @b382190

resolved all threads

marked the checklist item Gitlab CI passes (Hint: use make format for linting) as completed

marked the checklist item New feature is covered by additional unit tests as completed

marked the checklist item Mark the merge request as ready by removing Draft: as completed

marked the checklist item Reviewed by a maintainer as completed

marked the checklist item Incorporate review suggestions as completed

marked the checklist item Prior to merging, please remove any boilerplate from the MR description, retaining only the Please describe your feature in a couple of words and describe important implementation details of the feature section to maintain as completed