From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-217988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 15324 invoked by alias); 11 May 2007 21:15:16 -0000
Received: (qmail 15034 invoked by uid 48); 11 May 2007 21:15:03 -0000
Date: Fri, 11 May 2007 21:15:00 -0000
Subject: [Bug c++/31903]  New: unwanted anonymous namespacing linkage
X-Bugzilla-Reason: CC
Message-ID: <bug-31903-1447@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "mrs at apple dot com" <gcc-bugzilla@gcc.gnu.org>
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: 2007-05/txt/msg00853.txt.bz2

It appears that 4.2 isn't making anonymous namespace variables unique (it's
also making them global). This is preventing LLVM from compiling with the 4.2
compiler.

$ cat foo.cpp
#include <typeinfo>

namespace {
  class foo {
   virtual void bar();
  };
}

void foo::bar() {}

#ifdef FOO
const std::type_info &X = typeid(foo);
#else
const std::type_info &Y = typeid(foo);
#endif

extern const std::type_info &X;

#ifndef FOO
int main() {}
#endif

$ g++-4.2 foo.cpp -c -o a.o
$ g++-4.2 foo.cpp -c -o b.o -DFOO
$ g++-4.2 a.o b.o
ld64-73.6 failed: duplicate symbol typeinfo for (anonymous namespace)::fooin
b.o and a.o


-- 
           Summary: unwanted anonymous namespacing linkage
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mrs at apple dot com
GCC target triplet: i686-apple-darwin9


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31903