libc-internal.h 3.9 KB

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  1. /* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 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. #ifndef _LIBC_INTERNAL_H
  16. #define _LIBC_INTERNAL_H 1
  17. /* Some nice features only work properly with ELF */
  18. #if defined __HAVE_ELF__
  19. /* Define ALIASNAME as a weak alias for NAME. */
  20. # define weak_alias(name, aliasname) _weak_alias (name, aliasname)
  21. # define _weak_alias(name, aliasname) \
  22. extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
  23. /* Define ALIASNAME as a strong alias for NAME. */
  24. # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
  25. # define _strong_alias(name, aliasname) \
  26. extern __typeof (name) aliasname __attribute__ ((alias (#name)));
  27. /* This comes between the return type and function name in
  28. * a function definition to make that definition weak. */
  29. # define weak_function __attribute__ ((weak))
  30. # define weak_const_function __attribute__ ((weak, __const__))
  31. /* Tacking on "\n\t#" to the section name makes gcc put it's bogus
  32. * section attributes on what looks like a comment to the assembler. */
  33. # if defined(__cris__)
  34. # define link_warning(symbol, msg)
  35. # else
  36. # define link_warning(symbol, msg) \
  37. asm (".section " ".gnu.warning." #symbol "\n\t.previous"); \
  38. static const char __evoke_link_warning_##symbol[] \
  39. __attribute__ ((unused, section (".gnu.warning." #symbol "\n\t#"))) = msg;
  40. #endif
  41. #else /* !defined __HAVE_ELF__ */
  42. # define strong_alias(name, aliasname) _strong_alias (name, aliasname)
  43. # define weak_alias(name, aliasname) _strong_alias (name, aliasname)
  44. # define _strong_alias(name, aliasname) \
  45. __asm__(".global " __C_SYMBOL_PREFIX__ #aliasname "\n" \
  46. ".set " __C_SYMBOL_PREFIX__ #aliasname "," __C_SYMBOL_PREFIX__ #name);
  47. # define link_warning(symbol, msg) \
  48. asm (".stabs \"" msg "\",30,0,0,0\n\t" \
  49. ".stabs \"" #symbol "\",1,0,0,0\n");
  50. #endif
  51. #ifndef weak_function
  52. /* If we do not have the __attribute__ ((weak)) syntax, there is no way we
  53. can define functions as weak symbols. The compiler will emit a `.globl'
  54. directive for the function symbol, and a `.weak' directive in addition
  55. will produce an error from the assembler. */
  56. # define weak_function /* empty */
  57. # define weak_const_function /* empty */
  58. #endif
  59. /* On some platforms we can make internal function calls (i.e., calls of
  60. functions not exported) a bit faster by using a different calling
  61. convention. */
  62. #ifndef internal_function
  63. # define internal_function /* empty */
  64. #endif
  65. /* Prepare for the case that `__builtin_expect' is not available. */
  66. #if __GNUC__ == 2 && __GNUC_MINOR__ < 96
  67. #define __builtin_expect(x, expected_value) (x)
  68. #endif
  69. #ifndef likely
  70. # define likely(x) __builtin_expect((!!(x)),1)
  71. #endif
  72. #ifndef unlikely
  73. # define unlikely(x) __builtin_expect((!!(x)),0)
  74. #endif
  75. #ifndef __LINUX_COMPILER_H
  76. #define __LINUX_COMPILER_H
  77. #endif
  78. #ifndef __cast__
  79. #define __cast__(_to)
  80. #endif
  81. /* Arrange to hide uClibc internals */
  82. #if __GNUC_PREREQ (3, 3)
  83. # define attribute_hidden __attribute__ ((visibility ("hidden")))
  84. #else
  85. # define attribute_hidden
  86. #endif
  87. /* --- this is added to integrate linuxthreads */
  88. #define __USE_UNIX98 1
  89. #endif /* _LIBC_INTERNAL_H */