From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-380734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 23638 invoked by alias); 21 Jan 2012 10:56:34 -0000
Received: (qmail 23628 invoked by uid 22791); 21 Jan 2012 10:56:33 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
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; Sat, 21 Jan 2012 10:56:20 +0000
From: "sefi@s-e-f-i.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51930] New: Explicitly instantiated template gets hidden visibility
Date: Sat, 21 Jan 2012 11:41:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: sefi@s-e-f-i.de
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-51930-4@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
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: 2012-01/txt/msg02409.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51930

             Bug #: 51930
           Summary: Explicitly instantiated template gets hidden
                    visibility
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sefi@s-e-f-i.de


gcc-4.7 produces a symbol with hidden visibility for testfunc<foo>, while
gcc-4.6 produces a symbol with default visibility.

struct foo
{
};

template<
        typename T
>
__attribute__ ((visibility("default")))
void testfunc();

template<
        typename T
>
void testfunc()
{
}

template
__attribute__ ((visibility("default")))
void testfunc<foo>();


I compiled this with 
g++-4.7 -fvisibility=hidden -shared test.cpp


If I replace

struct foo {};

with 

struct __attribute__ ((visibility("default"))) foo {};

then testfunc<foo> gets default visibility even with gcc-4.7.

Is this intentional?