[Bug 247753] Mk/Uses/compiler.mk: compiler:openmp still forces the use of gcc

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247753

            Bug ID: 247753
           Summary: Mk/Uses/compiler.mk: compiler:openmp still forces the
                    use of gcc
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: tjlegg at gmail.com
                CC: jhale at FreeBSD.org, kwm at FreeBSD.org
                CC: jhale at FreeBSD.org, kwm at FreeBSD.org

I'd like to thank the FreeBSD team for enabling openmp for the base clang. 

Unfortunately, most of the ports that have an OPENMP option, just default to
OPENMP_USES= compiler:openmp.

If you look at Mk/Uses/compiler.mk, the openmp option forces the use of gcc,
which defeats the purpose of having base being openmp-enabled.

I've altered a few ports like graphics/libraw, graphics/ImageMagick7, and
math/fftw3 to have the OPENMP option to provide OPENMP_FLAGS= -lm -lomp and
LDFLAGS+= ${OPENMP_FLAGS} instead of OPENMP_USES= compiler:openmp.

These libraries compile successfully without a gcc9 dependency. Digikam tells
that its raw demosaicing is now parallelised based on libraw having a
functional openmp.

Rather than hand edit port Makefiles, would it be possible to update the
compiler:openmp option to reflect the work that has landed in base?

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