Re: [PATCH. fortran] Add automatic linking to caf_shmem using -fcoarray=shared

Hi Jerry,

This does what it says on the box :-)

OK for mainline and backporting to 16-branch.

Regards

Paul

On Mon, 11 May 2026 at 00:26, Jerry D <[email protected]> wrote:
>
> On 5/9/26 2:12 PM, Andre Vehreschild wrote:
> > Hi Jerry,
> >
> > shouldn't that be dg-do link in testcase? Does dg-do compile also link?
> >
> > Regards,
> > Andre
> >
> > Andre Vehreschild
>
> See revised patch attached, ready for approval.
>
> OK for mainline and backport to 16?
>
> Regards,
>
> Jerry
> ---
>  From 0fb3be9df144dec1a0bba475ae8e64ac81df3586 Mon Sep 17 00:00:00 2001
> From: Jerry DeLisle <[email protected]>
> Date: Sat, 9 May 2026 11:49:21 -0700
> Subject: [PATCH] fortran: Add -fcoarray=shared option to auto-link -lcaf_shmem
>
> The new -fcoarray=shared option provides a convenient shorthand for
> the common invocation -fcoarray=lib -lcaf_shmem.  The driver transforms
> -fcoarray=shared into -fcoarray=lib for the frontend and automatically
> appends -lcaf_shmem to the link command.  Existing uses of -fcoarray=lib
> are unaffected.
>
> Assisted by: Claude Sonnet 4.6
>
> gcc/:
>
>         * flag-types.h (gfc_fcoarray): Add GFC_FCOARRAY_SHARED.
>
> gcc/fortran/:
>
>         * lang.opt (fcoarray=): Add shared enum value; update help text.
>         * gfortranspec.cc (CAF_SHMEM_LIBRARY): New macro.
>         (lang_specific_driver): Detect -fcoarray=shared in first pass and
>         set need_caf_shmem flag.  In second pass, transform -fcoarray=shared
>         to -fcoarray=lib for cc1.  Append -lcaf_shmem when need_caf_shmem
>         is set and linking is active.
>
> gcc/testsuite/:
>
>         * gfortran.dg/coarray_51.f90: New test.