From eca84853e4d7985ed2d4c2477620225f734e87f0 Mon Sep 17 00:00:00 2001
From: Will Estes <wlestes@users.sourceforge.net>
Date: Fri, 17 Feb 2012 21:21:44 +0000
Subject: [PATCH] resolve #1990170

---
 flex.skl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/flex.skl b/flex.skl
index 80fa8b1..60c141f 100644
--- a/flex.skl
+++ b/flex.skl
@@ -1078,7 +1078,7 @@ m4_ifdef( [[M4_YY_NOT_IN_HEADER]],
 /* This used to be an fputs(), but since the string might contain NUL's,
  * we now use fwrite().
  */
-#define ECHO fwrite( yytext, yyleng, 1, yyout )
+#define ECHO do { if (fwrite( yytext, yyleng, 1, yyout )) {} } while (0)
 %endif
 %if-c++-only C++ definition
 #define ECHO LexerOutput( yytext, yyleng )
-- 
2.40.0