From 60c8294801d179c1b038f1be3e45c8d5935c5240 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 22 Jul 2004 14:39:03 +0000
Subject: [PATCH] (b4_symbol_actions): Don't assume %union was used.

---
 data/c.m4 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/data/c.m4 b/data/c.m4
index a72f059..c651f62 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -327,7 +327,8 @@ m4_define([b4_syncline],
 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 # -------------------------------------------------
 m4_define([b4_symbol_actions],
-[m4_pushdef([b4_dollar_dollar], [yyvaluep->$6])dnl
+[m4_pushdef([b4_dollar_dollar],
+   [m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
 m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
       case $4: /* $3 */
 b4_syncline([$2], [$1])
-- 
2.7.4