fbsdcompat/sys/cdefs.h

   1 /*
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Berkeley Software Design, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
  37  * $FreeBSD: /repoman/r/ncvs/src/sys/sys/cdefs.h,v 1.68 2002/10/21 20:50:30 mike Exp $
  38  */
  39
  40 #ifndef _SYS_CDEFS_H_
  41
  42 /*
  43  * Compiler-dependent macros to help declare dead (non-returning) and
  44  * pure (no side effects) functions, and unused variables.  They are
  45  * null except for versions of gcc that are known to support the features
  46  * properly (old versions of gcc-2 supported the dead and pure features
  47  * in a different (wrong) way).  If we do not provide an implementation
  48  * for a given compiler, let the compile fail if it is told to use
  49  * a feature that we cannot live without.
  50  */
  51 #ifdef lint
  52 #define __packed
  53 #define __aligned(x)
  54 #define __section(x)
  55 #else
  56 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3
  57 #define __packed        __attribute__((__packed__))
  58 #define __aligned(x)    __attribute__((__aligned__(x)))
  59 #define __section(x)    __attribute__((__section__(x)))
  60 #endif
  61 #endif
  62
  63 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  64 #if !(__GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3)
  65 #define __func__        NULL
  66 #endif
  67
  68 #if __GNUC__ >= 2 && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  69 #define __LONG_LONG_SUPPORTED
  70 #endif
  71
  72 /*
  73  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  74  * require it.
  75  */
  76 #define __offsetof(type, field) ((size_t)(&((type *)0)->field))
  77
  78 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  79 #if __FreeBSD_cc_version >= 300001 && __FreeBSD_cc_version < 500003
  80 #define __printf0like(fmtarg, firstvararg) \
  81             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  82 #else
  83 #define __printf0like(fmtarg, firstvararg)
  84 #endif
  85
  86 #ifdef __GNUC__
  87 #define __strong_reference(sym,aliassym)        \
  88         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
  89 #ifdef __APPLE__
  90 #define __weak_reference(sym,alias)
  91 #define __warn_references(sym,msg)
  92 #else // ! __APPLE__
  93 #ifdef __STDC__
  94 #define __weak_reference(sym,alias)     \
  95         __asm__(".weak " #alias);       \
  96         __asm__(".equ "  #alias ", " #sym)
  97 #define __warn_references(sym,msg)      \
  98         __asm__(".section .gnu.warning." #sym); \
  99         __asm__(".asciz \"" msg "\"");  \
 100         __asm__(".previous")
 101 #else
 102 #define __weak_reference(sym,alias)     \
 103         __asm__(".weak alias");         \
 104         __asm__(".equ alias, sym")
 105 #define __warn_references(sym,msg)      \
 106         __asm__(".section .gnu.warning.sym"); \
 107         __asm__(".asciz \"msg\"");      \
 108         __asm__(".previous")
 109 #endif  /* __STDC__ */
 110 #endif // __APPLE__
 111 #endif  /* __GNUC__ */
 112
 113 /*
 114  * Embed the rcs id of a source file in the resulting library.  Note that in
 115  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
 116  * Usage:
 117  *      __FBSDID("$FreeBSD: /repoman/r/ncvs/src/sys/sys/cdefs.h,v 1.68 2002/10/21 20:50:30 mike Exp $");
 118  */
 119 #ifndef __FBSDID
 120 #if !defined(lint) && !defined(STRIP_FBSDID)
 121 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
 122 #else
 123 #define __FBSDID(s)     struct __hack
 124 #endif
 125 #endif
 126
 127 #ifndef __RCSID
 128 #ifndef NO__RCSID
 129 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
 130 #else
 131 #define __RCSID(s)
 132 #endif
 133 #endif
 134
 135 #ifndef __RCSID_SOURCE
 136 #ifndef NO__RCSID_SOURCE
 137 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
 138 #else
 139 #define __RCSID_SOURCE(s)
 140 #endif
 141 #endif
 142
 143 #ifndef __SCCSID
 144 #ifndef NO__SCCSID
 145 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
 146 #else
 147 #define __SCCSID(s)
 148 #endif
 149 #endif
 150
 151 #ifndef __COPYRIGHT
 152 #ifndef NO__COPYRIGHT
 153 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
 154 #else
 155 #define __COPYRIGHT(s)
 156 #endif
 157 #endif
 158
 159 #ifndef __DECONST
 160 #define __DECONST(type, var)    ((type)(uintptr_t)(const void *)(var))
 161 #endif
 162
 163 #ifndef __DEVOLATILE
 164 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
 165 #endif
 166
 167 #ifndef __DEQUALIFY
 168 #define __DEQUALIFY(type, var)  ((type)(uintptr_t)(const volatile void *)(var))
 169 #endif
 170
 171 /*
 172  * Now include the Apple version of sys/cdefs.h
 173  */
 174
 175 #include_next <sys/cdefs.h>
 176
 177 /*
 178  * Use FreeBSD version of __CONCAT
 179  */
 180 #if defined(__STDC__) || defined(__cplusplus)
 181 #undef __CONCAT1
 182 #undef __CONCAT
 183 #define __CONCAT1(x,y)  x ## y
 184 #define __CONCAT(x,y)   __CONCAT1(x,y)
 185 #endif
 186
 187 /*
 188  * Deal with all versions of POSIX.  The ordering relative to the tests above is
 189  * important.
 190  */
 191 #ifdef _POSIX_C_SOURCE
 192 #if _POSIX_C_SOURCE >= 200112
 193 #define __POSIX_VISIBLE         200112
 194 #define __ISO_C_VISIBLE         1999
 195 #elif _POSIX_C_SOURCE >= 199506
 196 #define __POSIX_VISIBLE         199506
 197 #define __ISO_C_VISIBLE         1990
 198 #elif _POSIX_C_SOURCE >= 199309
 199 #define __POSIX_VISIBLE         199309
 200 #define __ISO_C_VISIBLE         1990
 201 #elif _POSIX_C_SOURCE >= 199209
 202 #define __POSIX_VISIBLE         199209
 203 #define __ISO_C_VISIBLE         1990
 204 #elif _POSIX_C_SOURCE >= 199009
 205 #define __POSIX_VISIBLE         199009
 206 #define __ISO_C_VISIBLE         1990
 207 #else
 208 #define __POSIX_VISIBLE         198808
 209 #define __ISO_C_VISIBLE         0
 210 #endif /* _POSIX_C_SOURCE */
 211 #else
 212 /*-
 213  * Deal with _ANSI_SOURCE:
 214  * If it is defined, and no other compilation environment is explicitly
 215  * requested, then define our internal feature-test macros to zero.  This
 216  * makes no difference to the preprocessor (undefined symbols in preprocessing
 217  * expressions are defined to have value zero), but makes it more convenient for
 218  * a test program to print out the values.
 219  *
 220  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
 221  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
 222  * environment (and in fact we will never get here).
 223  */
 224 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
 225 #define __POSIX_VISIBLE         0
 226 #define __XSI_VISIBLE           0
 227 #define __BSD_VISIBLE           0
 228 #define __ISO_C_VISIBLE         1990
 229 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
 230 #define __POSIX_VISIBLE         0
 231 #define __XSI_VISIBLE           0
 232 #define __BSD_VISIBLE           0
 233 #define __ISO_C_VISIBLE         1999
 234 #else                           /* Default environment: show everything. */
 235 #define __POSIX_VISIBLE         200112
 236 #define __XSI_VISIBLE           600
 237 #define __BSD_VISIBLE           1
 238 #define __ISO_C_VISIBLE         1999
 239 #endif
 240 #endif
 241
 242 #endif /* !_SYS_CDEFS_H_ */