cp-tree.h (DECL_LANGUAGE): Don't assume DECL_LANG_SPECIFIC is set.

cp-tree.h (DECL_LANGUAGE): Don't assume DECL_LANG_SPECIFIC is set.

	* cp-tree.h (DECL_LANGUAGE): Don't assume DECL_LANG_SPECIFIC is
	set.
	(SET_DECL_LANGUAGE): New macro.
	* decl.c (duplicate_decls): Use SET_DECL_LANGUAGE.
	(pushdecl): Likewise.
	(build_library_fn_1): Likewise.
	(build_cp_library_fn): Likewise.
	(grokfndecl): Likewise.
	(grokvardecl): Mark `extern "C"' variables as having C linkage.
	* decl2.c (grokclassfn): Use SET_DECL_LANGUAGE.
	* lex.c (retrofit_lang_decl): Likewise.
	* mangle.c (mangle_decl_string): Don't mangle the names of
	variables declared with C language linkage.
	* semantics.c (finish_member_declaration): Use SET_DECL_LANGUAGE.

From-SVN: r41430