From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id CFE51384B13A; Thu, 27 Oct 2022 19:49:38 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CFE51384B13A
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1666900178;
	bh=ZB/e+qrRk4ShGo677vebHSA/fehzHXrlmYqrIYLpChE=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=Y/invFLu3u4CBpCPtsRTMpiQD8Oob0hxWZaILturpSocDhL//nGHvFpCsssOcH0dI
	 ADHzq/lWe94qKmKZdx2X7u8FgN/+RVQ7rpHb2EMCdBfssdEsXDVg4r+nLQAmGcJPtG
	 ltLktk61EYuEpVQcyMWnYYzouKdeo3o+CPUM9W/A=
From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/107441] optional arguments are identified as "present"
 when missing
Date: Thu, 27 Oct 2022 19:49:38 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 12.2.1
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: anlauf at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-107441-4-ri8sjo0r1z@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107441-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107441-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107441

--- Comment #5 from anlauf at gcc dot gnu.org ---
(In reply to anlauf from comment #4)
> Is there a public documentation what the ordering should be?

It is actually documented for gfortran:

https://gcc.gnu.org/onlinedocs/gfortran/Argument-passing-conventions.html

The arguments are passed in the following order

* Result variable, when the function result is passed by reference
* Character length of the function result, if it is a of type CHARACTER and=
 no
C binding is used
* The arguments in the order in which they appear in the Fortran declaration
* The present status for optional arguments with value attribute, which are
internally passed by value
* The character length and/or coarray token and offset for the first argume=
nt
which is a CHARACTER or a nonallocatable coarray dummy argument, followed by
the hidden arguments of the next dummy argument of such a type=20

So it is create_function_arglist which is broken.=