decl.c (min_location): New.

decl.c (min_location): New.

/cp
2018-07-03  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (min_location): New.
	(smallest_type_quals_location): Use the latter.
	(check_concept_fn): Use DECL_SOURCE_LOCATION.
	(grokdeclarator): Use accurate locations in a number of error
	messages involving ds_thread, ds_storage_class, ds_virtual,
	ds_constexpr, ds_typedef and ds_friend; exploit min_location.

/testsuite
2018-07-03  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/other/locations1.C: New.
	* g++.dg/tls/locations1.C: Likewise.
	* g++.dg/diagnostic/virtual-constexpr.C: Likewise.
	* g++.dg/diagnostic/virtual-static.C: Likewise.
	* g++.dg/concepts/fn-concept2.C: Test the locations too.
	* g++.dg/cpp0x/constexpr-virtual5.C: Likewise.
	* g++.dg/cpp0x/pr51463.C: Likewise.
	* g++.dg/other/typedef1.C: Likewise.
	* g++.dg/parse/dtor13.C: Likewise.
	* g++.dg/template/error44.C: Likewise.
	* g++.dg/template/typedef4.C: Likewise.
	* g++.dg/template/typedef5.C: Likewise.
	* g++.dg/tls/diag-2.C: Likewise.
	* g++.old-deja/g++.brendan/crash11.C: Likewise.

From-SVN: r262358