re PR c++/84445 (ICE with __builtin_launder and virtual function)

	PR c++/84445
	* class.c (fixed_type_or_null) <case CALL_EXPR>: Only test
	TREE_HAS_CONSTRUCTOR if instance is not an internal function call.

	* g++.dg/cpp1z/launder7.C: New test.

From-SVN: r257840

gcc/cp/ChangeLog

 2018-02-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/84445
+	* class.c (fixed_type_or_null) <case CALL_EXPR>: Only test
+	TREE_HAS_CONSTRUCTOR if instance is not an internal function call.
+
 	PR c++/84449
 	* tree.c (bot_manip): If build_cplus_new or break_out_target_exprs
 	returns error_mark_node, return it immediately.

gcc/cp/class.c

@@ -7128,7 +7128,8 @@ fixed_type_or_null (tree instance, int *nonnull, int *cdtorp)
 
     case CALL_EXPR:
       /* This is a call to a constructor, hence it's never zero.  */
-      if (TREE_HAS_CONSTRUCTOR (instance))
+      if (CALL_EXPR_FN (instance)
+	  && TREE_HAS_CONSTRUCTOR (instance))
 	{
 	  if (nonnull)
 	    *nonnull = 1;

gcc/testsuite/ChangeLog

 2018-02-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/84445
+	* g++.dg/cpp1z/launder7.C: New test.
+
 	PR c++/84449
 	* g++.dg/cpp0x/constexpr-84449.C: New test.
 

gcc/testsuite/g++.dg/cpp1z/launder7.C

+// PR c++/84445
+// { dg-do compile }
+
+struct A { virtual void foo (); };
+
+void
+bar (A *p)
+{
+  __builtin_launder (p)->foo ();
+}