[Bug fortran/64921] [4.9/5/6 Regression] FAIL: gfortran.dg/class_allocate_18.f90

["rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64921

--- Comment #23 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 28 Jul 2015, mikael at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64921
> 
> --- Comment #22 from Mikael Morin <mikael at gcc dot gnu.org> ---
> (In reply to rguenther@suse.de from comment #21)
> > Transfer.4 _is_ null in the case we segfault.  So the guard us clearly wrong.
> > 
> OK, let's try something else.
> Are you positive transfer.4 is null?
> I don't see anything that would make it so.

>From inspecting registers and the assembly.  The debugger cannot get
at the artificial decls.

> If it is transfer.10 that is  null, I can see the call to __final_main_T2 that
> is suspicious; it seems to pass a descriptorless array to an argument expecting
> a descriptor.
> 
> Draft patch, seems to fix it
> 
> diff --git a/gcc/fortran/class.c b/gcc/fortran/class.c
> index 218973d..7a9e275 100644
> --- a/gcc/fortran/class.c
> +++ b/gcc/fortran/class.c
> @@ -1599,6 +1599,7 @@ generate_finalization_wrapper (gfc_symbol *derived,
> gfc_namespace *ns,
>    final->ts.type = BT_INTEGER;
>    final->ts.kind = 4;
>    final->attr.artificial = 1;
> +  final->attr.always_explicit = 1;
>    final->attr.if_source = expr_null_wrapper ? IFSRC_IFBODY : IFSRC_DECL;
>    if (ns->proc_name->attr.flavor == FL_MODULE)
>      final->module = ns->proc_name->name;

even better