From 2b406f107b94eabebf92d20bb189d2c223e5d51c Mon Sep 17 00:00:00 2001
From: bel2125 <bel2125@gmail.com>
Date: Sun, 27 Aug 2017 20:27:49 +0200
Subject: [PATCH] Generate NAN and INFINITY in case they are not defined by the
 system headers

---
 tests/check_check_sub.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tests/check_check_sub.c b/tests/check_check_sub.c
index dfde2f9..c446f38 100644
--- a/tests/check_check_sub.c
+++ b/tests/check_check_sub.c
@@ -27,6 +27,17 @@
 #include <check.h>
 #include "check_check.h"
 
+#if !defined(NAN)
+/* According to POSIX, NAN and INFINITY are defined in math.h, see
+ * http://pubs.opengroup.org/onlinepubs/009695399/basedefs/math.h.html 
+ * Hovever, older Visual Studio compilers do not define these values.
+ */
+double NAN;
+#endif
+#if !defined(INFINITY)
+double INFINITY;
+#endif
+
 START_TEST(test_lno)
 {
   record_test_name(tcase_name());
@@ -2965,6 +2976,13 @@ Suite *make_sub_suite(void)
   TCase *tc_exit_handlers;
 #endif
 
+#if !defined(NAN)
+  NAN /= NAN; /* division of 0 by 0 */
+#endif
+#if !defined(INFINITY)
+  INFINITY = 1.0 / INFINITY; /* division of 1 by 0 */
+#endif
+
   s = suite_create("Check Servant");
 
   tc_simple = tcase_create("Simple Tests");
-- 
2.50.1