PR bootstrap/53459 - unused local typedef when building on altivec

	PR bootstrap/53459
	* lex.c (search_line_fast): Avoid unused local typedefs to simulate
	a static assertion.

From-SVN: r187947

libcpp/ChangeLog

+2012-05-25  Dodji Seketeli  <dodji@redhat.com>
+
+	PR bootstrap/53459
+	* lex.c (search_line_fast): Avoid unused local typedefs to simulate
+	a static assertion.
+
 2012-05-29  Dodji Seketeli  <dodji@redhat.com>
 
 	PR preprocessor/53229

libcpp/lex.c

@@ -590,10 +590,10 @@ search_line_fast (const uchar *s, const uchar *end ATTRIBUTE_UNUSED)
   {
 #define N  (sizeof(vc) / sizeof(long))
 
-    typedef char check_count[(N == 2 || N == 4) * 2 - 1];
     union {
       vc v;
-      unsigned long l[N];
+      /* Statically assert that N is 2 or 4.  */
+      unsigned long l[(N == 2 || N == 4) ? N : -1];
     } u;
     unsigned long l, i = 0;