Re: [PATCH] PR fortran/87992 -- trivially stupid patch, but ...

[Steve Kargl <sgk at troutmask dot apl dot washington dot edu>]

On Sun, Dec 16, 2018 at 09:42:25AM -0800, Steve Kargl wrote:
> The following patch removes the ICE reported in PR fortran/87992,
> and restores the behavior observed with gfortran 7 and 8 (ie,
> code compiles).
> 
> The PR marks the code with ice-on-invalid-code.  I don't use
> CLASS in any of code and have never read the standard nor a
> Fortran book about CLASS.  If the code is invalid, is gfortran
> required by a constraint to reject the code.  If yes, someone
> with CLASS will need to address this PR; otherwise, I will
> commit the patch and close it as FIXED.
> 
> PS: the patch simply checks for a non-NULL pointer.
> 
> Index: gcc/fortran/resolve.c
> ===================================================================
> --- gcc/fortran/resolve.c	(revision 267190)
> +++ gcc/fortran/resolve.c	(working copy)
> @@ -12313,7 +12313,11 @@ resolve_fl_variable (gfc_symbol *sym, int mp_flag)
>      {
>        /* Make sure that character string variables with assumed length are
>  	 dummy arguments.  */
> -      e = sym->ts.u.cl->length;
> +      if (sym->ts.u.cl)
> +	e = sym->ts.u.cl->length;
> +      else
> +	return false;
> +
>        if (e == NULL && !sym->attr.dummy && !sym->attr.result
>  	  && !sym->ts.deferred && !sym->attr.select_type_temporary
>  	  && !sym->attr.omp_udr_artificial_var)
> Index: gcc/testsuite/gfortran.dg/pr87992.f90
> ===================================================================
> --- gcc/testsuite/gfortran.dg/pr87992.f90	(nonexistent)
> +++ gcc/testsuite/gfortran.dg/pr87992.f90	(working copy)
> @@ -0,0 +1,5 @@
> +! { dg-do compile }
> +subroutine s(x)
> +   class(*), allocatable :: x
> +   x = ''
> +end
> 

Patched committed on trunk after verification from
Gerhard that the code is valid Fortran.

-- 
Steve