PR c++/82219 - bogus -Wignored-qualifiers with template

	* pt.c (tsubst_copy_and_build) [STATIC_CAST_EXPR]: Suppress
	-Wignored-qualifiers.

From-SVN: r255279

gcc/cp/ChangeLog

+2017-11-30  Jason Merrill  <jason@redhat.com>
+
+	PR c++/82219 - bogus -Wignored-qualifiers with template
+	* pt.c (tsubst_copy_and_build) [STATIC_CAST_EXPR]: Suppress
+	-Wignored-qualifiers.
+
 2017-11-29  David Malcolm  <dmalcolm@redhat.com>
 
 	* parser.c (cp_parser_unary_expression): Generate a location for

gcc/cp/pt.c

@@ -17180,6 +17180,7 @@ tsubst_copy_and_build (tree t,
 	op = RECUR (TREE_OPERAND (t, 0));
 
 	warning_sentinel s(warn_useless_cast);
+	warning_sentinel s2(warn_ignored_qualifiers);
 	switch (TREE_CODE (t))
 	  {
 	  case CAST_EXPR:

gcc/testsuite/g++.dg/warn/Wignored-qualifiers1.C

+// PR c++/82219
+// { dg-additional-options "-Wall -Wextra" }
+
+struct A {
+  template <typename T> T foo(T *) const { return static_cast<T>(0); }
+  void bar() const { foo(&i); }
+  int i;
+};