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 A5D4F3858C83; Fri, 14 Oct 2022 16:04:48 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A5D4F3858C83
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1665763488;
	bh=lmPYvgndiosN7Rw01UtkYX50x12ugvKsffQOWNI53ko=;
	h=From:To:Subject:Date:From;
	b=IBFjQKfcQsg3zYRcXCRTOmDSqxyNSSrI1f98K4/6OXGb4B5NVkcSkrNBZa1kqPWaA
	 rq2wefrtFZDQMSy4YzRBEFsbDAzRFP7qMohbNMB78ok+aXv7OHs/4D2gnt/DSVZA5M
	 cPfix0/cJz5tXJ47NJPPAPZLTRIAspVm4BdElC0I=
From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: =?UTF-8?B?W0J1ZyBmb3J0cmFuLzEwNzI2Nl0gTmV3OiBSZWplY3Qga2luZD00?=
 =?UTF-8?B?IGNoYXJhY3RlcnMgZm9yIEJJTkQoQykg4oCTIGl0IGludmFsaWQgYW5kIGdl?=
 =?UTF-8?B?bmVyYXRlcyB3cm9uZyBjb2Rl?=
Date: Fri, 14 Oct 2022 16:04:48 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: accepts-invalid, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: burnus at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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: bug_id short_desc product version bug_status
 keywords bug_severity priority component assigned_to reporter
 target_milestone
Message-ID: <bug-107266-4@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=3D107266

            Bug ID: 107266
           Summary: Reject kind=3D4 characters for BIND(C) =E2=80=93 it inv=
alid and
                    generates wrong code
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid, wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
  Target Milestone: ---

There is code which expects that CHARACTER arguments inside BIND(C) procedu=
res
is kind=3D1 (alias C_CHAR):

  if (sym->ts.type =3D=3D BT_CHARACTER
      && ((sym->attr.function && sym->attr.is_bind_c)
          || ((sym->attr.result || sym->attr.value)
              && sym->ns->proc_name
              && sym->ns->proc_name->attr.is_bind_c)
          || (sym->ts.deferred && (!sym->ts.u.cl
                                   || !sym->ts.u.cl->backend_decl))))
    type =3D gfc_character1_type_node;
  else
    type =3D gfc_typenode_for_spec (&sym->ts, sym->attr.codimension);

If one now tries to use:

call foo(4_'abcd')
contains
subroutine foo(x)
  character(kind=3D4,len=3D4) :: x
  ...
end
end

this creates inconsistent interfaces!

Alternatively, if we want to support it, we need to change how this is hand=
led
to yield proper code!=