From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-343179-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 27404 invoked by alias); 11 Jan 2011 21:39:08 -0000
Received: (qmail 27395 invoked by uid 22791); 11 Jan 2011 21:39:07 -0000
X-SWARE-Spam-Status: No, hits=-2.8 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,TW_TM
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 11 Jan 2011 21:39:02 +0000
From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/47240] [F03] segfault with procedure pointer component
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dominiq at lps dot ens.fr
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: janus at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-47240-4-0YjDjtgAVS@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-47240-4@http.gcc.gnu.org/bugzilla/>
References: <bug-47240-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Date: Tue, 11 Jan 2011 23:15:00 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2011-01/txt/msg01118.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47240

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-01-11 21:38:46 UTC ---
(In reply to comment #7)
> > ...
> > ... this produces loads of regressions.
>
> ... but the following variant doesn't:
> ...

Confirmed, however the following code


[macbook] f90/bug% cat pr35971_red.f90
module other_fun
   use ISO_C_BINDING
   implicit none
   private
! Message to be returned by procedure pointed to
! by the C_FUNPTR
   character, allocatable, save :: my_message(:)
! Interface block for the procedure pointed to
! by the C_FUNPTR
   public abstract_fun
   abstract interface
      function abstract_fun(x)
         use ISO_C_BINDING
         import my_message
         implicit none
         integer(C_INT) x(:)
         character(size(my_message),C_CHAR) abstract_fun(size(x))
      end function abstract_fun
   end interface
   contains
! Procedure to store the message and get the C_FUNPTR
      function gp(message) bind(C,name='BlAh')
!         procedure(abstract_fun) make_mess
         character(kind=C_CHAR) message(*)
         type(C_FUNPTR) gp
         integer(C_INT64_T) i

         i = 1
         do while(message(i) /= C_NULL_CHAR)
            i = i+1
         end do
         my_message = message(int(1,kind(i)):i-1)
         gp = get_funloc(make_mess,aux)
!         gp = aux(make_mess)
      end function gp

! Intermediate procedure to pass the function and get
! back the C_FUNPTR
      function get_funloc(x,y)
         procedure(abstract_fun) x
         type(C_FUNPTR) y
         external y
         type(C_FUNPTR) get_funloc

         get_funloc = y(x)
      end function get_funloc

! Procedure to convert the function to C_FUNPTR
      function aux(x)
         interface
            subroutine x() bind(C)
            end subroutine x
         end interface
         type(C_FUNPTR) aux

         aux = C_FUNLOC(x)
      end function aux

! Procedure pointed to by the C_FUNPTR
      function make_mess(x)
         integer(C_INT) x(:)
         character(size(my_message),C_CHAR) make_mess(size(x))

         make_mess = transfer(my_message,make_mess(1))
      end function make_mess
end module other_fun
end

gives at -O2 and above

[macbook] f90/bug% gfc -O2 pr35971_red.f90
pr35971_red.f90: In function 'gp':
pr35971_red.f90:67:0: error: non-trivial conversion at assignment
void (*<T64>) (void)
void (*<T49d>) (struct array1_unknown &, integer(kind=4), struct
array1_integer(kind=4) & restrict)
__result_gp_72 = make_mess;

pr35971_red.f90:67:0: internal compiler error: verify_stmts failed