re PR c++/12862 (Conflicts Between typedefs/enums and Namespace Member Declarations)

re PR c++/12862 (Conflicts Between typedefs/enums and Namespace Member Declarations)

	* c-common.c (flag_external_templates): Remove.
	(flag_alt_external_templates): Likewise.
	* c-common.h (flag_external_templates): Remove.
	(flag_alt_external_templates): Likewise.
	* c-opts.c (c_common_handle_option): Unsupport
	-falt-external-templates and -ftemplates.
	* doc/invoke.texi: Remove mention of -fexternal-templates and
	-falt-external-templates.

	* decl.c (start_function): Do not check
	flag_alt_external_templates or flag_external_templates.
	* decl2.c (warn_if_unknown_interface): Likewise.
	* lex.c (extract_interface_info): Likewise.
	* pt.c (lookup_template_class): Likewise.

	PR c++/12862
	* name-lookup.c (pushdecl): Look up all namespace-scope entities
	in their corresponding namespace.

	* g++.old-deja/g++.jason/template18.C: Remove.
	* g++.old-deja/g++.jason/template37.C: Likewise.

	PR c++/12862
	* g++.dg/lookup/ns1.C: New test.

From-SVN: r74954