kc3-lang/gnulib/tests/test-math.c

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• Hash : 833333f7
  Author :
  Date : 2008-04-12T07:22:40
  

  Work around Solaris 10 math.h bug.
  
  * 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>
  

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• tests/test-math.c

• /* 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;
  }
  

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