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From: "ntvdm at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/52647] New: Method from global namespace not selected in anonymous namespace when an overload of said method already exists in the anonymous namespace
Date: Wed, 21 Mar 2012 01:59:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D52647

             Bug #: 52647
           Summary: Method from global namespace not selected in anonymous
                    namespace when an overload of said method already
                    exists in the anonymous namespace
    Classification: Unclassified
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ntvdm@hotmail.com


In gcc 3.4, 4.1 and 4.3 attempting to compile (e.g. g++43 -c):

  void foo(char) {}
  namespace { void foo(void*) {} }
  namespace { void bar() { foo('x'); } }

...yields:

  /tmp/yy.cpp: In function =E2=80=98void<unnamed>::bar()=E2=80=99:
  /tmp/yy.cpp:3: error: invalid conversion from =E2=80=98char=E2=80=99 to =
=E2=80=98void*=E2=80=99
  /tmp/yy.cpp:3: error:   initializing argument 1 of
=E2=80=98void<unnamed>::foo(void*)=E2=80=99

...whereas attempting to compile:

  void foo(char) {}
  namespace anon { void foo(void*) {} }
  using namespace anon;
  namespace { void bar() { foo('x'); } }

...succeeds.  Is this the desired behaviour?

g++43 (GCC) 4.3.2 20081007 (Red Hat 4.3.2-7)
Copyright (C) 2008 Free Software Foundation, Inc.