FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h

     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Berkeley Software Design, Inc.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)cdefs.h     8.8 (Berkeley) 1/9/95
     * $FreeBSD: src/sys/sys/cdefs.h,v 1.11.2.4 1999/10/31 12:54:06 jdp Exp $
     */
    
    #ifndef _SYS_CDEFS_H_
    #define _SYS_CDEFS_H_
    
    #if defined(__cplusplus)
    #define __BEGIN_DECLS   extern "C" {
    #define __END_DECLS     }
    #else
    #define __BEGIN_DECLS
    #define __END_DECLS
    #endif
    
    /*
     * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
     * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
     * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
     * in between its arguments.  __CONCAT can also concatenate double-quoted
     * strings produced by the __STRING macro, but this only works with ANSI C.
     *
     * __XSTRING is like __STRING, but it expands any macros in its argument
     * first.  It is only available with ANSI C.
     */
    #if defined(__STDC__) || defined(__cplusplus)
    #define __P(protos)     protos          /* full-blown ANSI C */
    #define __CONCAT1(x,y)  x ## y
    #define __CONCAT(x,y)   __CONCAT1(x,y)
    #define __STRING(x)     #x              /* stringify without expanding x */
    #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
    
    #define __const         const           /* define reserved names to standard */
    #define __signed        signed
    #define __volatile      volatile
    #if defined(__cplusplus)
    #define __inline        inline          /* convert to C++ keyword */
    #else
    #ifndef __GNUC__
    #define __inline                        /* delete GCC keyword */
    #endif /* !__GNUC__ */
    #endif /* !__cplusplus */
    
    #else   /* !(__STDC__ || __cplusplus) */
    #define __P(protos)     ()              /* traditional C preprocessor */
    #define __CONCAT(x,y)   x/**/y
    #define __STRING(x)     "x"
    
    #ifndef __GNUC__
    #define __const                         /* delete pseudo-ANSI C keywords */
    #define __inline
    #define __signed
    #define __volatile
    /*
     * In non-ANSI C environments, new programs will want ANSI-only C keywords
     * deleted from the program and old programs will want them left alone.
     * When using a compiler other than gcc, programs using the ANSI C keywords
     * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
     * When using "gcc -traditional", we assume that this is the intent; if
     * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
     */
    #ifndef NO_ANSI_KEYWORDS
    #define const                           /* delete ANSI C keywords */
    #define inline
   #define signed
   #define volatile
   #endif  /* !NO_ANSI_KEYWORDS */
   #endif  /* !__GNUC__ */
   #endif  /* !(__STDC__ || __cplusplus) */
   
   /*
    * GCC1 and some versions of GCC2 declare dead (non-returning) and
    * pure (no side effects) functions using "volatile" and "const";
    * unfortunately, these then cause warnings under "-ansi -pedantic".
    * GCC2.5 uses a new, peculiar __attribute__((attrs)) style.  All of
    * these work for GNU C++ (modulo a slight glitch in the C++ grammar
    * in the distribution version of 2.5.5).
    */
   #if __GNUC__ < 2
   #define __dead
   #define __dead2
   #define __pure
   #define __pure2
   #define __unused
   #define __attribute__(x)
   #endif
   #if __GNUC__ == 2 && __GNUC_MINOR__ < 5
   #define __dead          __volatile
   #define __dead2
   #define __pure          __const
   #define __pure2
   #define __unused
   #endif
   #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7
   #define __dead
   #define __dead2         __attribute__((__noreturn__))
   #define __pure
   #define __pure2         __attribute__((__const__))
   #define __unused
   #endif
   #if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3
   #define __dead
   #define __dead2         __attribute__((__noreturn__))
   #define __pure
   #define __pure2         __attribute__((__const__))
   #define __unused        __attribute__((__unused__))
   #endif
   
   #if __GNUC__ < 2 || __GNUC__ == 2 && __GNUC_MINOR__ < 7
   #define __printflike(fmtarg, firstvararg)
   #define __scanflike(fmtarg, firstvararg)
   #else
   #define __printflike(fmtarg, firstvararg) \
               __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
   #define __scanflike(fmtarg, firstvararg) \
               __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
   #endif
   
   #ifdef __GNUC__
   #ifdef __STDC__
   #define __weak_reference(sym,alias)     \
           __asm__(".stabs \"_" #alias "\",11,0,0,0");     \
           __asm__(".stabs \"_" #sym "\",1,0,0,0")
   #define __warn_references(sym,msg)      \
           __asm__(".stabs \"" msg "\",30,0,0,0");         \
           __asm__(".stabs \"_" #sym "\",1,0,0,0")
   #else
   #define __weak_reference(sym,alias)     \
           __asm__(".stabs \"_/**/alias\",11,0,0,0");      \
           __asm__(".stabs \"_/**/sym\",1,0,0,0")
   #define __warn_references(sym,msg)      \
           __asm__(".stabs msg,30,0,0,0");                 \
           __asm__(".stabs \"_/**/sym\",1,0,0,0")
   #endif
   #endif
   
   #define __IDSTRING(name,string) \
           static const char name[] __attribute__((__unused__)) = string
   
   #ifndef __RCSID
   #define __RCSID(s)      __IDSTRING(rcsid,s)
   #endif
   
   #ifndef __RCSID_SOURCE
   #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
   #endif
   
   #ifndef __COPYRIGHT
   #define __COPYRIGHT(s)  __IDSTRING(copyright,s)
   #endif
   
   #endif /* !_SYS_CDEFS_H_ */

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