re PR c++/59838 (ICE with an enum using an incomplete type)

	PR c++/59838
cp/
	* cvt.c (ocp_convert): Don't segfault on non-existing
	ENUM_UNDERLYING_TYPE.
testsuite/
	* g++.dg/diagnostic/pr59838.C: New test.

From-SVN: r206716

gcc/cp/ChangeLog

+2014-01-17  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/59838
+	* cvt.c (ocp_convert): Don't segfault on non-existing
+	ENUM_UNDERLYING_TYPE.
+
 2014-01-16  Jason Merrill  <jason@redhat.com>
 
 	PR c++/59821

gcc/cp/cvt.c

@@ -753,6 +753,7 @@ ocp_convert (tree type, tree expr, int convtype, int flags,
 	     unspecified.  */
 	  if ((complain & tf_warning)
 	      && TREE_CODE (e) == INTEGER_CST
+	      && ENUM_UNDERLYING_TYPE (type)
 	      && !int_fits_type_p (e, ENUM_UNDERLYING_TYPE (type)))
 	    warning_at (loc, OPT_Wconversion, 
 			"the result of the conversion is unspecified because "

gcc/testsuite/ChangeLog

 2014-01-17  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/59838
+	* g++.dg/diagnostic/pr59838.C: New test.
+
+2014-01-17  Marek Polacek  <polacek@redhat.com>
+
 	PR c/58346
 	* gcc.dg/pr58346.c: New test.
 

gcc/testsuite/g++.dg/diagnostic/pr59838.C

+// PR c++/59838
+// { dg-do compile }
+
+enum E { a, b = (E) a }; // { dg-error "conversion to incomplete type" }