re PR c/35748 (ICE with cast to invalid union)

	PR c/35748
	* c-typeck.c (build_c_cast): Skip invalid fields in unions.

	* gcc.dg/union-cast-4.c: New test.

From-SVN: r133737

gcc/ChangeLog

+2008-03-30  Volker Reichelt  <v.reichelt@netcologne.de>
+
+	PR c/35748
+	* c-typeck.c (build_c_cast): Skip invalid fields in unions.
+
 2008-03-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/35757

gcc/c-typeck.c

@@ -3628,8 +3628,9 @@ build_c_cast (tree type, tree expr)
       tree field;
 
       for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
-	if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
-		       TYPE_MAIN_VARIANT (TREE_TYPE (value))))
+	if (TREE_TYPE (field) != error_mark_node
+	    && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
+			  TYPE_MAIN_VARIANT (TREE_TYPE (value))))
 	  break;
 
       if (field)

gcc/testsuite/ChangeLog

+2008-03-30  Volker Reichelt  <v.reichelt@netcologne.de>
+
+	PR c/35748
+	* gcc.dg/union-cast-4.c: New test.
+
 2008-03-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/35757

gcc/testsuite/gcc.dg/union-cast-4.c

+/* PR c/35748 */
+
+union U { void x[1]; }; /* { dg-error "array of voids" } */
+
+void foo()
+{
+  (union U)0; /* { dg-error "type not present" } */
+}