if-div.c: New file.

2007-05-02  Eric Christopher  <echristo@apple.com>

	    * gcc.dg/cpp/if-div.c: New file.

2007-05-02  Eric Christopher  <echristo@apple.com>

	    * expr.c (num_div_op): Don't overflow if the result is
	    zero.

From-SVN: r124358

gcc/testsuite/ChangeLog

+2007-05-02  Eric Christopher  <echristo@apple.com>
+
+	* gcc.dg/cpp/if-div.c: New file.
+
 2007-05-02  Tom Tromey  <tromey@redhat.com>
 
 	PR preprocessor/28709:

gcc/testsuite/gcc.dg/cpp/if-div.c

+/* { dg-do preprocess } */
+
+/* Test that this preprocesses without error.  */
+
+#if (-1)/2
+#endif

libcpp/ChangeLog

+2007-05-02  Eric Christopher  <echristo@apple.com>
+
+	* expr.c (num_div_op): Don't overflow if the result is
+	zero.
+
 2007-05-02  Tom Tromey  <tromey@redhat.com>
 
 	PR preprocessor/28709:

libcpp/expr.c

@@ -1527,7 +1527,8 @@ num_div_op (cpp_reader *pfile, cpp_num lhs, cpp_num rhs, enum cpp_ttype op)
 	{
 	  if (negate)
 	    result = num_negate (result, precision);
-	  result.overflow = num_positive (result, precision) ^ !negate;
+	  result.overflow = (num_positive (result, precision) ^ !negate
+			     && !num_zerop (result));
 	}
 
       return result;