[metapackage] BLAS

[krystophny]

Merge after #1120 and fixing Intel and Mac (probably with MKL and Accelerate BLAS)

[krystophny]

Oh, I see now that Windows tests are merged from main, not all of them pass. Can you re-run the gcc13 one to see if this is by chance, or has something to do with this PR on BLAS? Edit: Tests are re-run right now due to one more merge from main.

[perazz]

Nice work @krystophny. Of course there are plenty BLAS/LAPACK versions, and this will grow with time, but it's a good way to begin supporting BLAS/LAPACK as a metapackage imho.

[perazz]

Most macOS versions (>=10.15) will have Accelerate, but there are users that employ very old versions as well. Should we attempt introspection #1128 first to check whether Accelerate is supported?

Suggested change

	this%flags = string_t("-framework Accelerate")
	this%has_build_flags = .true.
	this%link_flags = string_t("-framework Accelerate")
	this%has_link_flags = .true.
	return
	if (.not.compiler%check_flags_supported( &
	compile_flags="-framework Accelerate", &
	link_flags="-framework Accelerate")) then
	call fatal_error(error,'no Accelerate framework detected on the local system')
	return
	endif
	this%flags = string_t("-framework Accelerate")
	this%has_build_flags = .true.
	this%link_flags = string_t("-framework Accelerate")
	this%has_link_flags = .true.
	return

Note that we don't necessarily have to return with an error, we could just fallback to the pkg-config evaluation as a second choice. The same could be done for MKL and the Intel compilers.

[krystophny]

I agree we should check this and opted for the pkg-config fallback solution now. Let's see if all tests still pass.

[krystophny]

Tests are passing, should be fine to merge now.