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833333f7ed
* m4/math_h.m4 (gl_MATH_H): Check for bug. (gl_MATH_H_DEFAULTS): Set up default. * modules/math (Makefile.am): Replace new indicators. * lib/math.in.h (NAN, HUGE_VAL): Provide replacements. * tests/test-math.c (main): Test this. * m4/strtod.m4 (gl_FUNC_STRTOD): Don't rely on HUGE_VAL. * doc/posix-headers/math.texi (math.h): Mention bug. Reported by Nelson H. F. Beebe and Jim Meyering. Signed-off-by: Eric Blake <ebb9@byu.net>
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/* Test of <math.h> substitute.
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Copyright (C) 2007, 2008 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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#include <config.h>
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#include <math.h>
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#ifndef NAN
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# error NAN should be defined
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choke me
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#endif
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#if 0
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/* Check that NAN expands into a constant expression. */
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static float n = NAN;
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#endif
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/* Compare two numbers with ==.
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This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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'x == x' test. */
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static int
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numeric_equal (double x, double y)
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{
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return x == y;
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}
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int
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main ()
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{
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double d = NAN;
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double zero = 0.0;
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if (numeric_equal (d, d))
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return 1;
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d = HUGE_VAL;
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if (!numeric_equal (d, 1.0 / zero))
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return 1;
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return 0;
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}
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