mathdef.h 2.4 KB

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  1. /* Copyright (C) 1997,1998,1999,2000,2003,2004,2006
  2. Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <features.h>
  17. #if !defined _MATH_H && !defined _COMPLEX_H
  18. # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
  19. #endif
  20. /* FIXME! This file describes properties of the compiler, not the machine;
  21. it should not be part of libc!
  22. FIXME! This file does not deal with the -fshort-double option of
  23. gcc! */
  24. #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
  25. # define _MATH_H_MATHDEF 1
  26. # ifdef __GNUC__
  27. # if __STDC__ == 1
  28. /* In GNU or ANSI mode, gcc leaves `float' expressions as-is. */
  29. typedef float float_t; /* `float' expressions are evaluated as
  30. `float'. */
  31. typedef double double_t; /* `double' expressions are evaluated as
  32. `double'. */
  33. # else
  34. /* For `gcc -traditional', `float' expressions are evaluated as `double'. */
  35. typedef double float_t; /* `float' expressions are evaluated as
  36. `double'. */
  37. typedef double double_t; /* `double' expressions are evaluated as
  38. `double'. */
  39. # endif
  40. # else
  41. /* Wild guess at types for float_t and double_t. */
  42. typedef double float_t;
  43. typedef double double_t;
  44. # endif
  45. /* The values returned by `ilogb' for 0 and NaN respectively. */
  46. # define FP_ILOGB0 (-2147483647)
  47. # define FP_ILOGBNAN (2147483647)
  48. #endif /* ISO C99 */
  49. #ifdef __UCLIBC_HAS_LONG_DOUBLE_MATH__
  50. #include <bits/wordsize.h>
  51. /* Signal that we do not really have a `long double'. The disables the
  52. declaration of all the `long double' function variants. */
  53. # if __WORDSIZE == 32
  54. # undef __UCLIBC_HAS_LONG_DOUBLE_MATH__
  55. # endif /* __WORDSIZE == 32 */
  56. #endif /* __UCLIBC_HAS_LONG_DOUBLE_MATH__ */