From 14ca76646ad2140aba44ae7070b04019ce2b3da0 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Mon, 24 Sep 2012 13:20:33 -0600
Subject: [PATCH] mesa: add signbit() macro

Reviewed-by: Matt Turner <mattst88@gmail.com>
---
 src/mesa/main/imports.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index 81da5104717..a78d67966f8 100644
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -145,6 +145,13 @@ static inline int isblank(int ch) { return ch == ' ' || ch == '\t'; }
 /*@}*/
 
 
+/*
+ * signbit() is a macro on Linux.  Not available on Windows.
+ */
+#ifndef signbit
+#define signbit(x) ((x) < 0.0f)
+#endif
+
 
 /** single-precision inverse square root */
 static inline float
-- 
2.30.2