From c3974173a14380069c336dc7e65184685f41f32b Mon Sep 17 00:00:00 2001
From: Allen Byrne <byrn@hdfgroup.org>
Date: Thu, 30 Jan 2020 13:23:45 -0600
Subject: VS2010 needs an underscore

---
 src/H5win32defs.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/H5win32defs.h b/src/H5win32defs.h
index 29533dd..0a0bd37 100644
--- a/src/H5win32defs.h
+++ b/src/H5win32defs.h
@@ -40,6 +40,12 @@ typedef __int64             h5_stat_size_t;
 #define HDfileno(F)         _fileno(F)
 #define HDfstat(F,B)        _fstati64(F,B)
 #define HDisatty(F)         _isatty(F)
+
+/* The isnan function needs underscore in VS2012 and earlier */
+#if (_MSC_VER <= 1700)
+  #define HDisnan(X)      _isnan(X)
+#endif /* MSC_VER < 1700 */
+
 #define HDgetcwd(S,Z)       _getcwd(S,Z)
 #define HDgetdcwd(D,S,Z)    _getdcwd(D,S,Z)
 #define HDgetdrive()        _getdrive()
-- 
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