re PR c++/61670 (ICE on invalid in tree_nop_conversion)

	PR c++/61670
	* class.c (remove_zero_width_bit_fields): Check for null DECL_SIZE.

	* g++.dg/template/pr61670.C: New test.

From-SVN: r221671

gcc/cp/ChangeLog

+2015-03-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/61670
+	* class.c (remove_zero_width_bit_fields): Check for null DECL_SIZE.
+
 2015-03-24  Jason Merrill  <jason@redhat.com>
 
 	PR c++/65046

gcc/cp/class.c

@@ -5434,7 +5434,8 @@ remove_zero_width_bit_fields (tree t)
 	     DECL_INITIAL (*fieldsp).
 	     check_bitfield_decl eventually sets DECL_SIZE (*fieldsp)
 	     to that width.  */
-	  && integer_zerop (DECL_SIZE (*fieldsp)))
+	  && (DECL_SIZE (*fieldsp) == NULL_TREE
+	      || integer_zerop (DECL_SIZE (*fieldsp))))
 	*fieldsp = DECL_CHAIN (*fieldsp);
       else
 	fieldsp = &DECL_CHAIN (*fieldsp);

gcc/testsuite/ChangeLog

+2015-03-25  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/61670
+	* g++.dg/template/pr61670.C: New test.
+
 2015-03-25  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/54987

gcc/testsuite/g++.dg/template/pr61670.C

+// PR c++/61670
+// { dg-do compile }
+
+template <class>
+class A {
+  A: 0 // { dg-error "" }
+};
+
+A<int> a;