optimization/6323: GCC 3.1 regression from previous snapshot

[Gwenole Beauchesne]

Hi,

The following patch appears to have caused the regression:
<http://gcc.gnu.org/ml/gcc-patches/2002-03/msg01513.html>

2002-03-28  Roger Sayle  <roger@eyesopen.com>

        PR c++/5998:
        * decl.c (cxx_init_decl_processing): Re-enable built-in functions
        in the g++ front-end.
        (duplicate_decl): Allow redefinition of anticipated built-ins.
        Fix inlining problem by over-writing the old DECL_RTL.
        (lookup_namespace_name): Fail to find an identifier in the
        specified namespace if its still anticipated.
        (builtin_function_1): New function split out from builtin_function
        to create a builtin in the current namespace with given context.
        (builtin_function): Call builtin_function_1 to define the
        appropriate builtins in both the std and global namespaces.
        (select_decl): Don't test for anticipated decls here.
        (unqualified_namespace_lookup): Instead ignore them whilst
        searching through scopes and namespaces.
        * decl2.c (do_nonmember_using_decl): If a using declaration
        specifies an anticipated built-in function, mark it as no longer
        anticipated in that scope.
        (ambiguous_decl):  Avoid resolving to an anticipated decl.
        * lex.c (do_scoped_id): Fail to find an identifier in the global
        namespace if its still anticipated.

Bye,
Gwenole.