Re: Fortran patches

[Thomas Koenig <tkoenig@netcologne.de>]

Hi Steve,

>>>         PR fortran/88139
>>>         * dump-parse-tree.c (write_proc): Alternate return.
>> I dissent with this patch. The introduced error is meaningless and, as
>> mentioned by comment #3 in the PR, avoiding the ICE in dump-parse-tree
>> is not directly the issue. The code should be rejected in parsing. In
>> gcc-8.1 the invalid code is accepted (without an ICE) even without the
>> -fc-prototypes flag: I haven't finished building the compiler with
>> your changes yet to see whether that is still true afterwards, but at
>> least the test case doesn't try this, so I strongly suspect the patch
>> is incomplete to fix the PR.
>   
> Comment #3 does not contain a patch to fix the problem elsewhere.

I know :-)

> In F2003, 15.2.6 "Interoperability of procedures and procedure interfaces",
> I cannot find a prohibition on an alternate return in a subroutine
> interface with BIND(C).

I also does not allow this, and does not offer a valid interpretation
of what it should mean.

If it has a meaning, it should be translatable into something prescribed
by the standard with -fc-prototypes.

I have assigned the error to myself, so I will not forget to fix
it before the gcc 9 release.

Regards

	Thomas