On Wed, May 29, 2024 at 08:41:04AM +0200, Tobias Burnus wrote:
> Jakub Jelinek wrote:
> > How is that option different from
> > echo '#pragma omp requires unified_shared_memory' > omp-usm.h
> > gcc -include omp-usm.h
> > ?
> > I mean with -include you can add anything you want, not just one particular
> > directive, and adding a separate option for each is just weird.
>
> For C/C++, -include seems to be indeed sufficient (albeit not widely known).
> For Fortran, there at two issues: One placement/semantic issue: it has to be
> added per "compilation unit", i.e. to the specification part of a module,
> subprogram or main program. And a practical issue, gfortran shows:
>
> error: command-line option '-include !$omp requires' is valid for
> C/C++/ObjC/ObjC++ but not for Fortran
>
> Thus, for Fortran it is still intrinsically useful – even if one can argue
> whether that feature is needed at all / whether it should be added as
> command-line argument.
But then shouldn't we have an option that adds something at the start of
the declaration part of each <whatever is needed>?
I mean, option to add 'implicit none' everywhere, or this
'!$omp requires unified_shared_memory' etc.?
I could live with an one off option for clang compatibility, I just fear
that in 2 years we'll need another one etc. and that solving it in some more
versatile way would be better.
Jakub
