(do_xifdef): Handle c++ comments.

(do_endif): Likewise.

From-SVN: r9214

gcc/cccp.c

@@ -6953,7 +6953,11 @@ do_xifdef (buf, limit, op, keyword)
       U_CHAR c = *p++;
       if (is_space[c])
 	;
-      else if (c == '/' && p != ip->bufp && *p == '*') {
+      /* ??? Why is the test with ip->bufp here?  */
+      /* ??? We don't handle \-n inside /-*.  */
+      /* ??? Comment handling in general could use a major cleanup.  */
+      else if (c == '/' && p != ip->bufp
+	       && (*p == '*' || (cplusplus_comments && *p == '/'))) {
 	/* Skip this comment.  */
 	int junk = 0;
 	U_CHAR *save_bufp = ip->bufp;
@@ -7410,7 +7414,8 @@ do_endif (buf, limit, op, keyword)
       while (p != ep) {
 	U_CHAR c = *p++;
 	if (!is_space[c]) {
-	  if (c == '/' && p != ep && *p == '*') {
+	  if (c == '/' && p != ep
+	      && (*p == '*' || (cplusplus_comments && *p == '/'))) {
 	    /* Skip this comment.  */
 	    int junk = 0;
 	    U_CHAR *save_bufp = ip->bufp;