cdefs.h 8.3 KB

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  1. /* Copyright (C) 1992-2001, 2002 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 _SYS_CDEFS_H
  16. #define _SYS_CDEFS_H 1
  17. /* We are almost always included from features.h. */
  18. #ifndef _FEATURES_H
  19. # include <features.h>
  20. #endif
  21. /* The GNU libc does not support any K&R compilers or the traditional mode
  22. of ISO C compilers anymore. Check for some of the combinations not
  23. anymore supported. */
  24. #if defined __GNUC__ && !defined __STDC__
  25. # error "You need a ISO C conforming compiler to use the glibc headers"
  26. #endif
  27. /* Some user header file might have defined this before. */
  28. #undef __P
  29. #undef __PMT
  30. #ifdef __GNUC__
  31. /* GCC can always grok prototypes. For C++ programs we add throw()
  32. to help it optimize the function calls. But this works only with
  33. gcc 2.8.x and egcs. */
  34. # if defined __cplusplus && __GNUC_PREREQ (2,8)
  35. # define __THROW throw ()
  36. # else
  37. # define __THROW
  38. # endif
  39. # define __P(args) args __THROW
  40. /* This macro will be used for functions which might take C++ callback
  41. functions. */
  42. # define __PMT(args) args
  43. #else /* Not GCC. */
  44. # define __inline /* No inline functions. */
  45. # define __THROW
  46. # define __P(args) args
  47. # define __PMT(args) args
  48. # define __const const
  49. # define __signed signed
  50. # define __volatile volatile
  51. #endif /* GCC. */
  52. /* For these things, GCC behaves the ANSI way normally,
  53. and the non-ANSI way under -traditional. */
  54. #define __CONCAT(x,y) x ## y
  55. #define __STRING(x) #x
  56. /* This is not a typedef so `const __ptr_t' does the right thing. */
  57. #define __ptr_t void *
  58. #define __long_double_t long double
  59. /* C++ needs to know that types and declarations are C, not C++. */
  60. #ifdef __cplusplus
  61. # define __BEGIN_DECLS extern "C" {
  62. # define __END_DECLS }
  63. #else
  64. # define __BEGIN_DECLS
  65. # define __END_DECLS
  66. #endif
  67. /* The standard library needs the functions from the ISO C90 standard
  68. in the std namespace. At the same time we want to be safe for
  69. future changes and we include the ISO C99 code in the non-standard
  70. namespace __c99. The C++ wrapper header take case of adding the
  71. definitions to the global namespace. */
  72. #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES
  73. # define __BEGIN_NAMESPACE_STD namespace std {
  74. # define __END_NAMESPACE_STD }
  75. # define __USING_NAMESPACE_STD(name) using std::name;
  76. # define __BEGIN_NAMESPACE_C99 namespace __c99 {
  77. # define __END_NAMESPACE_C99 }
  78. # define __USING_NAMESPACE_C99(name) using __c99::name;
  79. #else
  80. /* For compatibility we do not add the declarations into any
  81. namespace. They will end up in the global namespace which is what
  82. old code expects. */
  83. # define __BEGIN_NAMESPACE_STD
  84. # define __END_NAMESPACE_STD
  85. # define __USING_NAMESPACE_STD(name)
  86. # define __BEGIN_NAMESPACE_C99
  87. # define __END_NAMESPACE_C99
  88. # define __USING_NAMESPACE_C99(name)
  89. #endif
  90. /* Support for bounded pointers. */
  91. #ifndef __BOUNDED_POINTERS__
  92. # define __bounded /* nothing */
  93. # define __unbounded /* nothing */
  94. # define __ptrvalue /* nothing */
  95. #endif
  96. /* Support for flexible arrays. */
  97. #if __GNUC_PREREQ (2,97)
  98. /* GCC 2.97 supports C99 flexible array members. */
  99. # define __flexarr []
  100. #else
  101. # ifdef __GNUC__
  102. # define __flexarr [0]
  103. # else
  104. # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
  105. # define __flexarr []
  106. # else
  107. /* Some other non-C99 compiler. Approximate with [1]. */
  108. # define __flexarr [1]
  109. # endif
  110. # endif
  111. #endif
  112. /* __asm__ ("xyz") is used throughout the headers to rename functions
  113. at the assembly language level. This is wrapped by the __REDIRECT
  114. macro, in order to support compilers that can do this some other
  115. way. When compilers don't support asm-names at all, we have to do
  116. preprocessor tricks instead (which don't have exactly the right
  117. semantics, but it's the best we can do).
  118. Example:
  119. int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
  120. #if defined __GNUC__ && __GNUC__ >= 2
  121. # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
  122. # define __ASMNAME(cname) __C_SYMBOL_PREFIX__ cname
  123. /*
  124. #elif __SOME_OTHER_COMPILER__
  125. # define __REDIRECT(name, proto, alias) name proto; \
  126. _Pragma("let " #name " = " #alias)
  127. */
  128. #endif
  129. /* GCC has various useful declarations that can be made with the
  130. `__attribute__' syntax. All of the ways we use this do fine if
  131. they are omitted for compilers that don't understand it. */
  132. #if !defined __GNUC__ || __GNUC__ < 2
  133. # define __attribute__(xyz) /* Ignore */
  134. #endif
  135. /* At some point during the gcc 2.96 development the `malloc' attribute
  136. for functions was introduced. We don't want to use it unconditionally
  137. (although this would be possible) since it generates warnings. */
  138. #if __GNUC_PREREQ (2,96)
  139. # define __attribute_malloc__ __attribute__ ((__malloc__))
  140. #else
  141. # define __attribute_malloc__ /* Ignore */
  142. #endif
  143. /* At some point during the gcc 2.96 development the `pure' attribute
  144. for functions was introduced. We don't want to use it unconditionally
  145. (although this would be possible) since it generates warnings. */
  146. #if __GNUC_PREREQ (2,96)
  147. # define __attribute_pure__ __attribute__ ((__pure__))
  148. #else
  149. # define __attribute_pure__ /* Ignore */
  150. #endif
  151. /* At some point during the gcc 3.1 development the `used' attribute
  152. for functions was introduced. We don't want to use it unconditionally
  153. (although this would be possible) since it generates warnings. */
  154. #if __GNUC_PREREQ (3,1)
  155. # define __attribute_used__ __attribute__ ((__used__))
  156. # define __attribute_noinline__ __attribute__ ((__noinline__))
  157. #else
  158. # define __attribute_used__ __attribute__ ((__unused__))
  159. # define __attribute_noinline__ /* Ignore */
  160. #endif
  161. /* gcc allows marking deprecated functions. */
  162. #if __GNUC_PREREQ (3,2)
  163. # define __attribute_deprecated__ __attribute__ ((__deprecated__))
  164. #else
  165. # define __attribute_deprecated__ /* Ignore */
  166. #endif
  167. /* At some point during the gcc 2.8 development the `format_arg' attribute
  168. for functions was introduced. We don't want to use it unconditionally
  169. (although this would be possible) since it generates warnings.
  170. If several `format_arg' attributes are given for the same function, in
  171. gcc-3.0 and older, all but the last one are ignored. In newer gccs,
  172. all designated arguments are considered. */
  173. #if __GNUC_PREREQ (2,8)
  174. # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
  175. #else
  176. # define __attribute_format_arg__(x) /* Ignore */
  177. #endif
  178. /* At some point during the gcc 2.97 development the `strfmon' format
  179. attribute for functions was introduced. We don't want to use it
  180. unconditionally (although this would be possible) since it
  181. generates warnings. */
  182. #if __GNUC_PREREQ (2,97)
  183. # define __attribute_format_strfmon__(a,b) \
  184. __attribute__ ((__format__ (__strfmon__, a, b)))
  185. #else
  186. # define __attribute_format_strfmon__(a,b) /* Ignore */
  187. #endif
  188. /* It is possible to compile containing GCC extensions even if GCC is
  189. run in pedantic mode if the uses are carefully marked using the
  190. `__extension__' keyword. But this is not generally available before
  191. version 2.8. */
  192. #if !__GNUC_PREREQ (2,8)
  193. # define __extension__ /* Ignore */
  194. #endif
  195. /* __restrict is known in EGCS 1.2 and above. */
  196. #if !__GNUC_PREREQ (2,92)
  197. # define __restrict /* Ignore */
  198. #endif
  199. /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
  200. array_name[restrict]
  201. GCC 3.1 supports this. */
  202. #if __GNUC_PREREQ (3,1) && !defined __GNUG__
  203. # define __restrict_arr __restrict
  204. #else
  205. # ifdef __GNUC__
  206. # define __restrict_arr /* Not supported in old GCC. */
  207. # else
  208. # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
  209. # define __restrict_arr restrict
  210. # else
  211. /* Some other non-C99 compiler. */
  212. # define __restrict_arr /* Not supported. */
  213. # endif
  214. # endif
  215. #endif
  216. #endif /* sys/cdefs.h */