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By [module.interface] p3, if an exported declaration is not within a header unit, it shall not declare a name with internal linkage. Unfortunately we cannot just do this within set_originating_module, since at the locations its called the linkage for declarations are not always fully determined yet. We could move the calls but this causes the checking assertion to fail as the originating module declaration may have moved, and in general for some kinds of declarations it's not always obvious where it should be moved to. This patch instead introduces a new function to check that the linkage of a declaration within a module is correct, to be called for all declarations once their linkage is fully determined. As a drive-by fix this patch also improves the source location of namespace aliases to point at the identifier rather than the terminating semicolon. gcc/cp/ChangeLog: * cp-tree.h (check_module_decl_linkage): Declare. * decl2.cc (finish_static_data_member_decl): Check linkage. * module.cc (set_originating_module): Adjust comment. (check_module_decl_linkage): New function. * name-lookup.cc (do_namespace_alias): Build alias with specified location, check linkage. (pushtag): Check linkage. (push_namespace): Slightly clarify error message. * name-lookup.h (do_namespace_alias): Add location parameter. * parser.cc (cp_parser_namespace_alias_definition): Pass identifier location to do_namespace_alias. (cp_parser_alias_declaration): Check linkage. (cp_parser_init_declarator): Check linkage. (cp_parser_function_definition_after_declarator): Check linkage. (cp_parser_save_member_function_body): Check linkage. * pt.cc (finish_concept_definition): Mark as public, check linkage. libcc1/ChangeLog: * libcp1plugin.cc (plugin_add_namespace_alias): Call do_namespace_alias with input_location. gcc/testsuite/ChangeLog: * g++.dg/modules/export-3.C: Adjust error message. * g++.dg/modules/export-6.C: New test. Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com> Reviewed-by: Jason Merrill <jason@redhat.com>