From eabe0dc910fdf8706423d39c781ff2095bc319b9 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Sat, 28 Apr 2012 22:38:06 -0300
Subject: [PATCH] b2/: new diagnostic function yywarnf

---
 b2/lang.h |  1 +
 b2/lang.l | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/b2/lang.h b/b2/lang.h
index ba8de4c..da060af 100644
--- a/b2/lang.h
+++ b/b2/lang.h
@@ -16,6 +16,7 @@
 void parse_hierarchy(void);
 void parse_characteristics(void);
 
+void yywarnf(const char *fmt, ...);
 void yyerrorf(const char *fmt, ...);
 void yyerror(const char *s);
 
diff --git a/b2/lang.l b/b2/lang.l
index c2b9744..99b5a4c 100644
--- a/b2/lang.l
+++ b/b2/lang.l
@@ -87,6 +87,18 @@ ID	[-_A-Za-z0-9()+./]
 %%
 
 
+void yywarnf(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	fprintf(stderr, "%d: warning: ", lineno);
+	vfprintf(stderr, fmt, ap) ;
+	fprintf(stderr, "\n");
+	va_end(ap);
+}
+
+
 void yyerrorf(const char *fmt, ...)
 {
 	va_list ap;