From 72310c87a519b3530e54b96cd1ceb84e0d385a9c Mon Sep 17 00:00:00 2001
From: James Myatt <james.myatt@tessella.com>
Date: Thu, 5 Feb 2015 15:56:49 +0000
Subject: [PATCH] Define INFINITY and NAN when missing

---
 math_compat.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/math_compat.h b/math_compat.h
index f40b8fa..baf3eb9 100644
--- a/math_compat.h
+++ b/math_compat.h
@@ -1,7 +1,7 @@
 #ifndef __math_compat_h
 #define __math_compat_h
 
-/* Define isnan and isinf on Windows/MSVC */
+/* Define isnan, isinf, infinity and nan on Windows/MSVC */
 
 #ifndef HAVE_DECL_ISNAN
 # ifdef HAVE_DECL__ISNAN
@@ -17,12 +17,15 @@
 # endif
 #endif
 
-#ifndef HAVE_DECL_NAN
-#error This platform does not have nan()
+#ifndef HAVE_DECL_INFINITY
+#include <float.h>
+#define INFINITY (DBL_MAX + DBL_MAX)
+#define HAVE_DECL_INFINITY
 #endif
 
-#ifndef HAVE_DECL_INFINITY
-#error This platform does not have INFINITY
+#ifndef HAVE_DECL_NAN
+#define NAN (INFINITY - INFINITY)
+#define HAVE_DECL_NAN
 #endif
 
 #endif
-- 
2.50.0