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Implement DR 757: It's OK for a decl to use a type without linkage so long as the decl is defined in the current translation unit. * decl2.c (no_linkage_decls): New vector. (mark_used): Add decls that use types with no linkage. (cp_write_global_declarations): Check that they are defined. (decl_defined_p, no_linkage_error): New fns. * cp-tree.h (DECL_NO_LINKAGE_CHECKED): New macro. (struct lang_decl_base): Add flag. * decl.c (grokfndecl): Don't check type linkage. (grokvardecl): If the type has no linkage, just make sure DECL_LANG_SPECIFIC is set. * pt.c (check_instantiated_arg): Don't check type linkage. * name-lookup.c (is_local_extern): New fn. * name-lookup.h: Declare it. From-SVN: r150634
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