* include/c_std/std_cmath.h: To prevent problems overloading
g++ builtins, use the double variants from the global namespace
before defining float and long double variants in std::.
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.
* g++.old-deja/g++.other/builtins5.C: New test.
* g++.old-deja/g++.other/builtins6.C: New test.
* g++.old-deja/g++.other/builtins7.C: New test.
* g++.old-deja/g++.other/builtins8.C: New test.
* g++.old-deja/g++.other/builtins9.C: New test.
From-SVN: r51568
d52e4867ca