PR c++/89973 - -Waddress-of-packed-member ICE with invalid conversion.

	PR c++/89973 - -Waddress-of-packed-member ICE with invalid conversion. 
	* c-warn.c (check_address_or_pointer_of_packed_member): Check the type
	of RHS.

	* g++.dg/warn/Waddress-of-packed-member2.C: New test.

From-SVN: r270166

gcc/c-family/ChangeLog

+2019-04-05  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/89973 - -Waddress-of-packed-member ICE with invalid conversion. 
+	* c-warn.c (check_address_or_pointer_of_packed_member): Check the type
+	of RHS.
+
 2019-04-03  Jason Merrill  <jason@redhat.com>
 
 	PR c++/86586 - -fcompare-debug=-Wsign-compare.

gcc/c-family/c-warn.c

@@ -2769,7 +2769,7 @@ check_address_or_pointer_of_packed_member (tree type, tree rhs)
 	  rhs = TREE_TYPE (rhs);	/* Pointer type.  */
 	  rhs = TREE_TYPE (rhs);	/* Function type.  */
 	  rhstype = TREE_TYPE (rhs);
-	  if (!POINTER_TYPE_P (rhstype))
+	  if (!rhstype || !POINTER_TYPE_P (rhstype))
 	    return NULL_TREE;
 	  rvalue = true;
 	}

gcc/testsuite/ChangeLog

+2019-04-05  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/89973 - -Waddress-of-packed-member ICE with invalid conversion. 
+	* g++.dg/warn/Waddress-of-packed-member2.C: New test.
+
 2019-04-05  Richard Biener  <rguenther@suse.de>
 
 	PR debug/89892

gcc/testsuite/g++.dg/warn/Waddress-of-packed-member2.C

+// PR c++/89973
+// { dg-do compile { target c++14 } }
+
+constexpr int a(); // { dg-warning "used but never defined" }
+
+template <typename>
+constexpr void *b = a(); // { dg-error "invalid conversion" }