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glibc  2.9
mathdef.h
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00001 /* Copyright (C) 1997, 1998, 1999, 2000, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #if !defined _MATH_H && !defined _COMPLEX_H
00020 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
00021 #endif
00022 
00023 
00024 /* FIXME! This file describes properties of the compiler, not the machine;
00025    it should not be part of libc!
00026 
00027    FIXME! This file does not deal with the -fshort-double option of
00028    gcc! */
00029 
00030 #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
00031 # define _MATH_H_MATHDEF    1
00032 
00033 # ifdef __GNUC__
00034 #  if __STDC__ == 1
00035 
00036 /* In GNU or ANSI mode, gcc leaves `float' expressions as-is.  */
00037 typedef float float_t;             /* `float' expressions are evaluated as
00038                                `float'.  */
00039 typedef double double_t;    /* `double' expressions are evaluated as
00040                                `double'.  */
00041 
00042 #  else
00043 
00044 /* For `gcc -traditional', `float' expressions are evaluated as `double'. */
00045 typedef double float_t;            /* `float' expressions are evaluated as
00046                                `double'.  */
00047 typedef double double_t;    /* `double' expressions are evaluated as
00048                                `double'.  */
00049 
00050 #  endif
00051 # else
00052 
00053 /* Wild guess at types for float_t and double_t. */
00054 typedef double float_t;
00055 typedef double double_t;
00056 
00057 # endif
00058 
00059 /* The values returned by `ilogb' for 0 and NaN respectively.  */
00060 # define FP_ILOGB0   0x80000001
00061 # define FP_ILOGBNAN 0x7fffffff
00062 
00063 #endif /* ISO C99 */
00064 
00065 #ifndef __NO_LONG_DOUBLE_MATH
00066 /* Signal that we do not really have a `long double'.  The disables the
00067    declaration of all the `long double' function variants.  */
00068 # define __NO_LONG_DOUBLE_MATH     1
00069 #endif