From 68b1273d2d355497a8e5f7568e97444be8d64d5f Mon Sep 17 00:00:00 2001
From: Cary R <cygcary@yahoo.com>
Date: Tue, 30 Mar 2010 10:51:18 -0700
Subject: [PATCH] The SDF timing spec list can have zero or more elements.

The SDF file format supports zero or more timing specs. Previously
the parser was one or more. Things like tie high/low cells do not
have any delay information so zero or more is needed and matches
the standard.
---
 vpi/sdf_parse.y | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/vpi/sdf_parse.y b/vpi/sdf_parse.y
index 3b10fea5c..fffe03a50 100644
--- a/vpi/sdf_parse.y
+++ b/vpi/sdf_parse.y
@@ -188,7 +188,7 @@ cell_list
 cell
   : '(' K_CELL celltype cell_instance
       { sdf_select_instance($3, $4); /* find the instance in the design */}
-    timing_spec_list
+    timing_spec_list_opt
     ')'
       { free($3);
 	if ($4) free($4);
@@ -216,9 +216,9 @@ cell_instance
 	    $$ = strdup(""); }
   ;
 
-timing_spec_list
-  : timing_spec_list timing_spec
-  | timing_spec
+timing_spec_list_opt
+  : /* Empty */
+  | timing_spec_list_opt timing_spec
   ;
 
 timing_spec