clang support for compiler:openmp

[Brooks Davis]

On Mon, Nov 07, 2016 at 10:12:59PM +0100, Matthieu Volat wrote:
> On Mon, 7 Nov 2016 16:59:36 +0000
> Brooks Davis <brooks at freebsd.org> wrote:
> 
> > On Sun, Nov 06, 2016 at 08:36:22AM +0100, Marcus von Appen wrote:
> > > Hi,
> > > 
> > > is there a specific reason, why we do not (yet) have openmp support for
> > > clang via compiler:openmp? With devel/openmp in the ports tree, I'd
> > > expect compiler:openmp to set
> > > 
> > > LIB_DEPENDS+=   libomp.so:devel/openmp
> > > 
> > > for compiler=clang. CFLAGS and LIBS/LDFLAGS might be tweaked on a
> > > per-port level.
> > 
> > I talked with Baptiste about this in Belgrade.  I think the best way
> > forward would be to remove the OPENMP option from the llvm ports and
> > alter the clang-patch-fopenmp.diff patch to use the .so from
> > devel/openmp.
> > 
> > I have a major deadline at the end of the week so it definitely won't
> > happen this week.
> > 
> 
> Would not that make that every clang use the llvm 3.8 libomp snapshot? It might be useful to use later versions in some cases, but anyway, that would be great!

It would mean sticking to a single version, but I'd be pretty surprised
if mixing them ended well so that's probably for the best.

> It would also be awesome if base clang would be able to find omp.h and libomp more "out of the box" once the package is installed...

libomp is pretty easy once I realized I needed to hardcode the path to
the .so, I'll have to see what's involved for omp.h.

-- Brooks
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