bits/huge_vall.h

   1 /* Default `HUGE_VALL' constant.
   2    Used by <stdlib.h> and <math.h> functions for overflow.
   3    Copyright (C) 1992, 1996, 1997, 2004 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _MATH_H
  22 # error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
  23 #endif
  24
  25 #if __GNUC_PREREQ(3,3)
  26 # define HUGE_VALL      (__builtin_huge_vall())
  27 #else
  28 # define HUGE_VALL      ((long double) HUGE_VAL)
  29 #endif