Problem with testing libstdc++ parallel headers?

[Paolo Carlini]

> > UNSUPPORTED: 25_algorithms/headers/algorithm/algorithm_parallel_mode.cc
> >
> > along with lines like:
> >
> > parallel_mode31631.cc:1:17: error: omp.h: No such file or directory
> >
> > This seems odd ot me since I am building libgomp with my compiler.
> >   
> Yes. I think it's simply because the relevant search path is
> missing when the dg-require run. We should fix this indeed, affects a
> few basic headers/ tests.

Note, that those tests *are* run as part of check-parallel. All in all, I'm not convinced we should make both the dg-require and the normal make check more complex (adding the required -B, etc) in order to run the tests also as part of make check...

Paolo.