[PATCH] Bug 123375 - Fortran ICE in insert_bbt while building crest package since r16-2189

[Harald Anlauf]

Am 18.01.26 um 3:48 AM schrieb Jerry D:
> This patch from Steve regression tested on x86_64.
> 
> Looks good to me. (see the PR)
> 
> I will commit some time tomorrow.
> 
> Regards,
> 
> Jerry
> 
> Author: Steven G. Kargl <kargl@gcc.gnu.org>
> Date:   Sat Jan 17 18:30:44 2026 -0800
> 
>      Fortran: Fix ICE on invalid code
> 
>      This patch tests whether a symbol imported into an interface
>      is already available in local scope.
> 
>              PR fortran/123375
> 
>      gcc/fortran/ChangeLog:
> 
>              * decl.cc (gfc_match_import): Check that imported entity 
> within
>              a interface is not from local scope.
> 
>      gcc/testsuite/ChangeLog:
> 
>              * gfortran.dg/import.f90: Run code testing for a warning that
>              is now an error.
>              * gfortran.dg/pr123375.f90: New test.
> 

Hi Jerry,

technically speaking, the following error may confuse users as it
is a little misleading:

    module bar3
       implicit none
       interface
          subroutine bah
             use foo
             import aa      ! { dg-error "already in the local scope" }
          end subroutine bah
       end interface
    end module bar3

aa is not available in the host, as detected by other compilers
(e.g. NAG), but I think we can live with it.

Otherwise OK from my side.

Thanks for the patch!

Harald