From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-407218-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 21648 invoked by alias); 20 Nov 2012 07:18:31 -0000
Received: (qmail 19060 invoked by uid 48); 20 Nov 2012 07:18:05 -0000
From: "lucdanton at free dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/55408] New: ICE for member template definition with non-type variadic parameter
Date: Tue, 20 Nov 2012 07:18:00 -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: lucdanton at free dot fr
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-55408-4@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: 2012-11/txt/msg01880.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55408

             Bug #: 55408
           Summary: ICE for member template definition with non-type
                    variadic parameter
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: lucdanton@free.fr


Created attachment 28740
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28740
Reproducible testcase

$ g++-snapshot --version
g++-snapshot (Debian 20120915-1) 4.8.0 20120915 (experimental) [trunk revision
191353]

When attempting to compile this program:

struct foo {
    template<int*>
    void bar();
};

template<int*...>
void foo::bar() {}

int main()
{
    extern int i;
    foo {}.bar<&i>();
}

GCC complains:

main.cpp: In function 'int main()':
main.cpp:12:21: internal compiler error: Segmentation fault
     foo {}.bar<&i>();
                     ^

Some casual investigating suggests that this happens every time the definition
for a member template is exactly the same as its declaration save for the fact
that a non-type parameter is made variadic. Otherwise, e.g. if the parameter in
question is a type or template parameter in the declaration or if the template
is declared taking int and defined taking long... then GCC correctly reports
that the definition doesn't have a match.