re PR c++/59480 (Missing error diagnostic: friend declaration specifying a default argument must be a definition)

/cp
2018-07-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* class.c (note_name_declared_in_class): Prefer permerror + inform
	to a pair of permerrors; use DECL_SOURCE_LOCATION.

/testsuite
2018-07-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/ext/uow-3.C: Adjust.
	* g++.dg/ext/uow-4.C: Likewise.
	* g++.dg/lookup/name-clash11.C: Likewise.
	* g++.dg/lookup/name-clash7.C: Likewise.
	* g++.dg/lookup/redecl1.C: Likewise.
	* g++.dg/warn/changes-meaning.C: Likewise.
	* g++.old-deja/g++.jason/scoping8.C: Likewise.
	* g++.old-deja/g++.law/nest1.C: Likewise.

/cp
2019-07-18  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/59480, DR 136
	* decl.c (check_no_redeclaration_friend_default_args): New.
	(duplicate_decls): Use the latter; also check that a friend
	declaration specifying default arguments is a definition.

/testsuite
2019-07-18  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/59480, DR 136
	* g++.dg/other/friend8.C: New.
	* g++.dg/other/friend9.C: Likewise.
	* g++.dg/other/friend10.C: Likewise.
	* g++.dg/other/friend11.C: Likewise.
	* g++.dg/other/friend12.C: Likewise.
	* g++.dg/parse/defarg4.C: Compile with -fpermissive -w.
	* g++.dg/parse/defarg8.C: Likewise.

From-SVN: r262851