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 10E133858CDA; Tue, 14 Nov 2023 21:17:45 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 10E133858CDA
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1699996665;
	bh=gEjfgg1JZmMhIaXLxiGMvpw0YLzdlllCpA9ujLkSCWM=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=PhBbaJUWWVSxWjDT/Lb4Pq3LpdRG4bjoikeI5h2f8Km1Xeh75dxh3VGjGzfX8qMuM
	 q5ZIUaU3YjnRqt42QxxL5zVa+DT3uGcMkEI9D4DZeNQXkKlN7fnY44xzXWj1zhgl4Z
	 6rNHq44hg/2Jjnq020zE79ypyUsAchMcx1cV8zBA=
From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/104819] Reject NULL without MOLD as actual to an
 assumed-rank dummy
Date: Tue, 14 Nov 2023 21:17:44 +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: 12.0
X-Bugzilla-Keywords: accepts-invalid
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-104819-4-LbDKZVyCYG@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-104819-4@http.gcc.gnu.org/bugzilla/>
References: <bug-104819-4@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=3D104819

--- Comment #6 from anlauf at gcc dot gnu.org ---
(In reply to anlauf from comment #5)
> We need to detect and diagnose violations of the above.

Example:

program main
  implicit none
  type t
    integer :: i
  end type t

  type(t),  allocatable, target :: xa
  type(t),  pointer             :: xp
  class(t), allocatable, target :: ya
  class(t), pointer             :: yp

  call foo_p (xp) ! Invalid
  call foo_p (xa) ! Invalid in F2008, valid in F2018

  call foo_p (yp) ! Valid, OK
  call foo_p (ya) ! Valid, OK

contains

  subroutine foo_p (x)
    class(t), pointer, intent(in) :: x
  end subroutine

end

The lines marked invalid are detected for -std=3Df2003, but not for >=3D f2=
008.=