X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c3e9f08f93bc8bbabcd4f4093e52ad8f8b5454ca..56ca3d8fce0c9db2f2829d7a7a07a9ad06cdf6a8:/data/c.m4

diff --git a/data/c.m4 b/data/c.m4
index 64f68fec..78b12325 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -567,3 +567,15 @@ typedef struct YYLTYPE
 # define YYLTYPE_IS_TRIVIAL 1
 #endif]])
 ])
+
+# b4_declare_yydebug
+# ------------------
+m4_define([b4_declare_yydebug],
+[[/* Enabling traces.  */
+#ifndef YYDEBUG
+# define YYDEBUG ]b4_debug_flag[
+#endif
+#if YYDEBUG
+extern int ]b4_prefix[debug;
+#endif][]dnl
+])