mathdef.h 2.1 KB

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  1. /* Copyright (C) 1997, 1998, 1999, 2000, 2004 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #if !defined _MATH_H && !defined _COMPLEX_H
  16. # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
  17. #endif
  18. /* FIXME! This file describes properties of the compiler, not the machine;
  19. it should not be part of libc!
  20. FIXME! This file does not deal with the -fshort-double option of
  21. gcc! */
  22. #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
  23. # define _MATH_H_MATHDEF 1
  24. # ifdef __GNUC__
  25. # if __STDC__ == 1
  26. /* In GNU or ANSI mode, gcc leaves `float' expressions as-is. */
  27. typedef float float_t; /* `float' expressions are evaluated as
  28. `float'. */
  29. typedef double double_t; /* `double' expressions are evaluated as
  30. `double'. */
  31. # else
  32. /* For `gcc -traditional', `float' expressions are evaluated as `double'. */
  33. typedef double float_t; /* `float' expressions are evaluated as
  34. `double'. */
  35. typedef double double_t; /* `double' expressions are evaluated as
  36. `double'. */
  37. # endif
  38. # else
  39. /* Wild guess at types for float_t and double_t. */
  40. typedef double float_t;
  41. typedef double double_t;
  42. # endif
  43. /* The values returned by `ilogb' for 0 and NaN respectively. */
  44. # define FP_ILOGB0 0x80000001
  45. # define FP_ILOGBNAN 0x7fffffff
  46. #endif /* ISO C99 */