Allow linux ppc to bootstrap again

From-SVN: r176631

gcc/ChangeLog

+2011-07-20  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	* config/rs6000/rs6000.c (rs6000_xcoff_strip_dollar): Rewrite to
+	avoid warnings when GCC is built with a C++ compiler.
+
 2011-07-22  Martin Jambor  <mjambor@suse.cz>
 
 	PR lto/49796

gcc/config/rs6000/rs6000.c

@@ -21894,17 +21894,18 @@ const char *
 rs6000_xcoff_strip_dollar (const char *name)
 {
   char *strip, *p;
-  int len;
+  const char *q;
+  size_t len;
 
-  p = strchr (name, '$');
+  q = (const char *) strchr (name, '$');
 
-  if (p == 0 || p == name)
+  if (q == 0 || q == name)
     return name;
 
   len = strlen (name);
-  strip = (char *) alloca (len + 1);
+  strip = XALLOCAVEC (char, len + 1);
   strcpy (strip, name);
-  p = strchr (strip, '$');
+  p = strip + (q - name);
   while (p)
     {
       *p = '_';