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+/* Test of <math.h> substitute.
+ Copyright (C) 2007, 2008 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
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <config.h>
+
+#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 ()
+{
+ 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;
+}