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glibc  2.9
mathdef.h
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00001 /* Copyright (C) 1997,1998,1999,2000,2003,2004,2006
00002        Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #if !defined _MATH_H && !defined _COMPLEX_H
00021 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
00022 #endif
00023 
00024 
00025 /* FIXME! This file describes properties of the compiler, not the machine;
00026    it should not be part of libc!
00027 
00028    FIXME! This file does not deal with the -fshort-double option of
00029    gcc! */
00030 
00031 #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
00032 # define _MATH_H_MATHDEF    1
00033 
00034 # ifdef __GNUC__
00035 #  if __STDC__ == 1
00036 
00037 /* In GNU or ANSI mode, gcc leaves `float' expressions as-is.  */
00038 typedef float float_t;             /* `float' expressions are evaluated as
00039                                `float'.  */
00040 typedef double double_t;    /* `double' expressions are evaluated as
00041                                `double'.  */
00042 
00043 #  else
00044 
00045 /* For `gcc -traditional', `float' expressions are evaluated as `double'. */
00046 typedef double float_t;            /* `float' expressions are evaluated as
00047                                `double'.  */
00048 typedef double double_t;    /* `double' expressions are evaluated as
00049                                `double'.  */
00050 
00051 #  endif
00052 # else
00053 
00054 /* Wild guess at types for float_t and double_t. */
00055 typedef double float_t;
00056 typedef double double_t;
00057 
00058 # endif
00059 
00060 /* The values returned by `ilogb' for 0 and NaN respectively.  */
00061 # define FP_ILOGB0   (-2147483647)
00062 # define FP_ILOGBNAN (2147483647)
00063 
00064 #endif /* ISO C99 */