X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-math.c;h=f940a2499ccf23f8bbcb72aa94fd78b875c7be0d;hb=880d107;hp=893ca81593965054eb999b4bac30bee04a46ba8e;hpb=57fdfd3f8ec62b105c53bcdf6f127c35c7fe7391;p=gnulib.git

diff --git a/tests/test-math.c b/tests/test-math.c
index 893ca8159..f940a2499 100644
--- a/tests/test-math.c
+++ b/tests/test-math.c
@@ -1,5 +1,5 @@
 /* Test of <math.h> substitute.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -20,8 +20,34 @@
 
 #include <math.h>
 
+#ifndef NAN
+# error NAN should be defined
+choke me
+#endif
+
+#if 0
+/* Check that NAN expands into a constant expression.  */
+static float n = NAN;
+#endif
+
+/* Compare two numbers with ==.
+   This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+   'x == x' test.  */
+static int
+numeric_equal (double x, double y)
+{
+  return x == y;
+}
+
 int
-main ()
+main (void)
 {
+  double d = NAN;
+  double zero = 0.0;
+  if (numeric_equal (d, d))
+    return 1;
+  d = HUGE_VAL;
+  if (!numeric_equal (d, 1.0 / zero))
+    return 1;
   return 0;
 }