From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-prs-return-35714-listarch-gcc-prs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 29575 invoked by alias); 15 May 2003 16:36:01 -0000
Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-prs/>
List-Post: <mailto:gcc-prs@gcc.gnu.org>
List-Help: <mailto:gcc-prs-help@gcc.gnu.org>
Sender: gcc-prs-owner@gcc.gnu.org
Received: (qmail 29538 invoked by uid 71); 15 May 2003 16:36:00 -0000
Resent-Date: 15 May 2003 16:36:00 -0000
Resent-Message-ID: <20030515163600.29537.qmail@sources.redhat.com>
Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer)
Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org, bsmedberg@covad.net
Resent-Reply-To: gcc-gnats@gcc.gnu.org, harinath@cs.umn.edu
Received: (qmail 20998 invoked by uid 48); 15 May 2003 16:31:49 -0000
Message-Id: <20030515163149.20997.qmail@sources.redhat.com>
Date: Thu, 15 May 2003 16:36:00 -0000
From: harinath@cs.umn.edu
Reply-To: harinath@cs.umn.edu
To: gcc-gnats@gcc.gnu.org
Cc: bsmedberg@covad.net
X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31)
X-GNATS-Notify: bsmedberg@covad.net
Subject: c++/10804: regression from 3.2: implicit instantiation of template static methods
X-SW-Source: 2003-05/txt/msg01802.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         10804
>Category:       c++
>Synopsis:       regression from 3.2: implicit instantiation of template static methods
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 15 16:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     harinath@cs.umn.edu
>Release:        gcc version 3.4 20030512 (experimental)
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
Linking fails on the following file:

--8<--
template<class T>
struct A
{
  A() { const void (*a)() = foo; }
  static const void foo() {}
};

int main(int argc, char *argv[])
{
  A<int> a;
}
--8<--

with the error:
/tmp/ccube68X.o(.gnu.linkonce.t._ZN1AIiEC1Ev+0x9): In function `A<int>::A[in-charge]()':
: undefined reference to `A<int>::foo()'
collect2: ld returned 1 exit status

There is no problem with GCC 3.2.
>How-To-Repeat:
c++ implicit-instantiation.cc

Here's the output of nm with GCC 3.4:

         U A<int>::foo()
00000000 W A<int>::A[in-charge]()
00000000 T main

and here's the output with GCC 3.2

00000000 W A<int>::foo()
00000000 W A<int>::A[in-charge]()
         U __gxx_personality_v0
00000000 T main

Notice that GCC 3.4 did DTRT with the constructor.  If I replace the use of foo in the code with a direct method call, then there's no problem either.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/x-c++src; name="implicit-instantiation.cc"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="implicit-instantiation.cc"

dGVtcGxhdGU8Y2xhc3MgVD4Kc3RydWN0IEEKewogIEEoKSB7IGNvbnN0IHZvaWQgKCphKSgpID0g
Zm9vOyB9CiAgc3RhdGljIGNvbnN0IHZvaWQgZm9vKCkge30KfTsKCmludCBtYWluKGludCBhcmdj
LCBjaGFyICphcmd2W10pCnsKICBBPGludD4gYTsKfQo=