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Date: Wed, 20 Oct 2004 12:47:00 -0000
From: "fafa at freesurf dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20041020124640.18077.fafa@freesurf.ch>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/18077] New: Members of anonymous namespaces get name mangled with first global variable instead of file name
X-Bugzilla-Reason: CC
X-SW-Source: 2004-10/txt/msg02608.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

Members of anonymous namespaces should get a name that is mangled in a way so 
as to make them unique. This is not the case if a global variable is defined 
before the keyword "namespace" is used. In that case the first global variable 
name is used for the name mangling. If I then link with "-z muldefs" I get 
wrong symbol resolution.

Example:
foo1.cpp:
  #include <stdio.h>

  int iii;
  namespace {
    void f() { printf("foo1\n"); }
  }

  void foo1() { f(); }

foo2.cpp:
  #include <stdio.h>

  int iii;
  namespace {
    void f() { printf("foo2\n"); }
  }

  void foo2() { f(); }

main.cpp:
  extern void foo1();
  extern void foo2();

  int main() {
    foo1();
    foo2();
    return 0;
  }

g++ -o foo foo1.cpp foo2.cpp main.cpp -z muldefs

./foo
generates the output
  foo1
  foo1
instead of
  foo1
  foo2
because both mangled names for the functions f are "_ZN14_GLOBAL__N_iii1fEv", 
and the linker chosses one of the two for both calls.

The error vanishes if I just write
  namespace {}
before the definition of iii, because then the mangled name of f changes 
to "_ZN25_GLOBAL__N_foo1.cppgmEtmb1fEv" which seems the correct name to me.

-- 
           Summary: Members of anonymous namespaces get name mangled with
                    first global variable instead of file name
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fafa at freesurf dot ch
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18077