Merge remote-tracking branch 'origin/maint'

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index 2b7e9d63c9523372a5a78807e56eb1ec36db8f7c..2601d561945d0b6adc35c888da540742f9a1ea5f 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -604,3 +604,15 @@ typedef struct YYLTYPE
 # define YYLTYPE_IS_TRIVIAL 1
 #endif]])
 ])
+
+# b4_declare_yydebug
+# ------------------
+m4_define([b4_declare_yydebug],
+[[/* Enabling traces.  */
+#ifndef YYDEBUG
+# define YYDEBUG ]b4_parse_trace_if([1], [0])[
+#endif
+#if YYDEBUG
+extern int ]b4_prefix[debug;
+#endif][]dnl
+])