* 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
