From 542fc504091107dbc65e75497fa4070bc91c6c39 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lukas=20W=C3=B6hrl?= <lukas@woehrl.net>
Date: Thu, 17 Nov 2016 20:41:46 -0800
Subject: [PATCH] do not redefine isnan if already defined via math.h

Summary:
```isnan``` is already defined in ```math.h``` (at least when using VS13) so there is no need to redefine it. it also is a nan for float and not for double opposed to ```_isnan```
Closes https://github.com/facebook/css-layout/pull/253

Reviewed By: emilsjolander

Differential Revision: D4199331

Pulled By: splhack

fbshipit-source-id: 139fb0efd68dd5df79bbaef863a8e8b9246c795d
---
 CSSLayout/CSSLayout.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CSSLayout/CSSLayout.c b/CSSLayout/CSSLayout.c
index e656eeb7..958af3e2 100644
--- a/CSSLayout/CSSLayout.c
+++ b/CSSLayout/CSSLayout.c
@@ -14,7 +14,9 @@
 
 #ifdef _MSC_VER
 #include <float.h>
+#ifndef isnan
 #define isnan _isnan
+#endif
 
 #ifndef __cplusplus
 #define inline __inline