PR c++/77369 - wrong noexcept handling in C++14 and below

	* tree.c (strip_typedefs): Canonicalize TYPE_RAISES_EXCEPTIONS.

From-SVN: r254022

gcc/cp/ChangeLog

+2017-10-23  Jason Merrill  <jason@redhat.com>
+
+	PR c++/77369 - wrong noexcept handling in C++14 and below
+	* tree.c (strip_typedefs): Canonicalize TYPE_RAISES_EXCEPTIONS.
+
 2017-10-20  Nathan Sidwell  <nathan@acm.org>
 
 	* class.c (layout_class_type): Cleanup as-base creation, determine

gcc/cp/tree.c

@@ -1439,7 +1439,11 @@ strip_typedefs (tree t, bool *remove_attributes)
 	  is_variant = true;
 
 	type = strip_typedefs (TREE_TYPE (t), remove_attributes);
-	changed = type != TREE_TYPE (t) || is_variant;
+	tree canon_spec = (flag_noexcept_type
+			   ? canonical_eh_spec (TYPE_RAISES_EXCEPTIONS (t))
+			   : NULL_TREE);
+	changed = (type != TREE_TYPE (t) || is_variant
+		   || TYPE_RAISES_EXCEPTIONS (t) != canon_spec);
 
 	for (arg_node = TYPE_ARG_TYPES (t);
 	     arg_node;
@@ -1498,9 +1502,8 @@ strip_typedefs (tree t, bool *remove_attributes)
 					type_memfn_rqual (t));
 	  }
 
-	if (TYPE_RAISES_EXCEPTIONS (t))
-	  result = build_exception_variant (result,
-					    TYPE_RAISES_EXCEPTIONS (t));
+	if (canon_spec)
+	  result = build_exception_variant (result, canon_spec);
 	if (TYPE_HAS_LATE_RETURN_TYPE (t))
 	  TYPE_HAS_LATE_RETURN_TYPE (result) = 1;
       }

gcc/testsuite/g++.dg/cpp0x/noexcept31.C

+// PR c++/77369
+// { dg-do compile { target c++11 } }
+
+template<typename F> int caller(F f) noexcept(noexcept(f())) { f(); return 0; }
+
+void func1() noexcept { }
+
+void func2() { throw 1; }
+
+int instantiate_caller_with_func1 = caller(func1);
+
+static_assert( !noexcept(caller(func2)), "" );

gcc/testsuite/g++.dg/cpp1z/noexcept-type13.C

@@ -5,7 +5,7 @@
 void foo () throw () {}		// { dg-bogus "mangled name" }
 
 template <class T>
-T bar (T x) { return x; }	// { dg-warning "mangled name" "" { target c++14_down } }
+T bar (T x) { return x; }
 
 void baz () {			// { dg-bogus "mangled name" }
   return (bar (foo)) ();