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001: /* Copyright (C) 1992-2001, 2002, 2004, 2005, 2006, 2007, 2009, 2011
002:    Free Software Foundation, Inc.
003:    This file is part of the GNU C Library.
004: 
005:    The GNU C Library is free software; you can redistribute it and/or
006:    modify it under the terms of the GNU Lesser General Public
007:    License as published by the Free Software Foundation; either
008:    version 2.1 of the License, or (at your option) any later version.
009: 
010:    The GNU C Library is distributed in the hope that it will be useful,
011:    but WITHOUT ANY WARRANTY; without even the implied warranty of
012:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:    Lesser General Public License for more details.
014: 
015:    You should have received a copy of the GNU Lesser General Public
016:    License along with the GNU C Library; if not, write to the Free
017:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
018:    02111-1307 USA.  */
019: 
020: #ifndef _SYS_CDEFS_H
021: #define _SYS_CDEFS_H    1
022: 
023: /* We are almost always included from features.h. */
024: #ifndef _FEATURES_H
025: # include <features.h>
026: #endif
027: 
028: /* The GNU libc does not support any K&R compilers or the traditional mode
029:    of ISO C compilers anymore.  Check for some of the combinations not
030:    anymore supported.  */
031: #if defined __GNUC__ && !defined __STDC__
032: # error "You need a ISO C conforming compiler to use the glibc headers"
033: #endif
034: 
035: /* Some user header file might have defined this before.  */
036: #undef  __P
037: #undef  __PMT
038: 
039: #ifdef __GNUC__
040: 
041: /* All functions, except those with callbacks or those that
042:    synchronize memory, are leaf functions.  */
043: # if __GNUC_PREREQ (4, 6) && !defined _LIBC
044: #  define __LEAF , __leaf__
045: #  define __LEAF_ATTR __attribute__ ((__leaf__))
046: # else
047: #  define __LEAF
048: #  define __LEAF_ATTR
049: # endif
050: 
051: /* GCC can always grok prototypes.  For C++ programs we add throw()
052:    to help it optimize the function calls.  But this works only with
053:    gcc 2.8.x and egcs.  For gcc 3.2 and up we even mark C functions
054:    as non-throwing using a function attribute since programs can use
055:    the -fexceptions options for C code as well.  */
056: # if !defined __cplusplus && __GNUC_PREREQ (3, 3)
057: #  define __THROW       __attribute__ ((__nothrow__ __LEAF))
058: #  define __THROWNL     __attribute__ ((__nothrow__))
059: #  define __NTH(fct)    __attribute__ ((__nothrow__ __LEAF)) fct
060: # else
061: #  if defined __cplusplus && __GNUC_PREREQ (2,8)
062: #   define __THROW      throw ()
063: #   define __THROWNL    throw ()
064: #   define __NTH(fct)   __LEAF_ATTR fct throw ()
065: #  else
066: #   define __THROW
067: #   define __THROWNL
068: #   define __NTH(fct)   fct
069: #  endif
070: # endif
071: 
072: #else   /* Not GCC.  */
073: 
074: # define __inline               /* No inline functions.  */
075: 
076: # define __THROW
077: # define __THROWNL
078: # define __NTH(fct)     fct
079: 
080: # define __const        const
081: # define __signed       signed
082: # define __volatile     volatile
083: 
084: #endif  /* GCC.  */
085: 
086: /* These two macros are not used in glibc anymore.  They are kept here
087:    only because some other projects expect the macros to be defined.  */
088: #define __P(args)       args
089: #define __PMT(args)     args
090: 
091: /* For these things, GCC behaves the ANSI way normally,
092:    and the non-ANSI way under -traditional.  */
093: 
094: #define __CONCAT(x,y)   x ## y
095: #define __STRING(x)     #x
096: 
097: /* This is not a typedef so `const __ptr_t' does the right thing.  */
098: #define __ptr_t void *
099: #define __long_double_t  long double
100: 
101: 
102: /* C++ needs to know that types and declarations are C, not C++.  */
103: #ifdef  __cplusplus
104: # define __BEGIN_DECLS  extern "C" {
105: # define __END_DECLS    }
106: #else
107: # define __BEGIN_DECLS
108: # define __END_DECLS
109: #endif
110: 
111: 
112: /* The standard library needs the functions from the ISO C90 standard
113:    in the std namespace.  At the same time we want to be safe for
114:    future changes and we include the ISO C99 code in the non-standard
115:    namespace __c99.  The C++ wrapper header take case of adding the
116:    definitions to the global namespace.  */
117: #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES
118: # define __BEGIN_NAMESPACE_STD  namespace std {
119: # define __END_NAMESPACE_STD    }
120: # define __USING_NAMESPACE_STD(name) using std::name;
121: # define __BEGIN_NAMESPACE_C99  namespace __c99 {
122: # define __END_NAMESPACE_C99    }
123: # define __USING_NAMESPACE_C99(name) using __c99::name;
124: #else
125: /* For compatibility we do not add the declarations into any
126:    namespace.  They will end up in the global namespace which is what
127:    old code expects.  */
128: # define __BEGIN_NAMESPACE_STD
129: # define __END_NAMESPACE_STD
130: # define __USING_NAMESPACE_STD(name)
131: # define __BEGIN_NAMESPACE_C99
132: # define __END_NAMESPACE_C99
133: # define __USING_NAMESPACE_C99(name)
134: #endif
135: 
136: 
137: /* Support for bounded pointers.  */
138: #ifndef __BOUNDED_POINTERS__
139: # define __bounded      /* nothing */
140: # define __unbounded    /* nothing */
141: # define __ptrvalue     /* nothing */
142: #endif
143: 
144: 
145: /* Fortify support.  */
146: #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
147: #define __bos0(ptr) __builtin_object_size (ptr, 0)
148: 
149: #if __GNUC_PREREQ (4,3)
150: # define __warndecl(name, msg) \
151:   extern void name (void) __attribute__((__warning__ (msg)))
152: # define __warnattr(msg) __attribute__((__warning__ (msg)))
153: # define __errordecl(name, msg) \
154:   extern void name (void) __attribute__((__error__ (msg)))
155: #else
156: # define __warndecl(name, msg) extern void name (void)
157: # define __warnattr(msg)
158: # define __errordecl(name, msg) extern void name (void)
159: #endif
160: 
161: /* Support for flexible arrays.  */
162: #if __GNUC_PREREQ (2,97)
163: /* GCC 2.97 supports C99 flexible array members.  */
164: # define __flexarr      []
165: #else
166: # ifdef __GNUC__
167: #  define __flexarr     [0]
168: # else
169: #  if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
170: #   define __flexarr    []
171: #  else
172: /* Some other non-C99 compiler.  Approximate with [1].  */
173: #   define __flexarr    [1]
174: #  endif
175: # endif
176: #endif
177: 
178: 
179: /* __asm__ ("xyz") is used throughout the headers to rename functions
180:    at the assembly language level.  This is wrapped by the __REDIRECT
181:    macro, in order to support compilers that can do this some other
182:    way.  When compilers don't support asm-names at all, we have to do
183:    preprocessor tricks instead (which don't have exactly the right
184:    semantics, but it's the best we can do).
185: 
186:    Example:
187:    int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
188: 
189: #if defined __GNUC__ && __GNUC__ >= 2
190: 
191: # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
192: # ifdef __cplusplus
193: #  define __REDIRECT_NTH(name, proto, alias) \
194:      name proto __THROW __asm__ (__ASMNAME (#alias))
195: #  define __REDIRECT_NTHNL(name, proto, alias) \
196:      name proto __THROWNL __asm__ (__ASMNAME (#alias))
197: # else
198: #  define __REDIRECT_NTH(name, proto, alias) \
199:      name proto __asm__ (__ASMNAME (#alias)) __THROW
200: #  define __REDIRECT_NTHNL(name, proto, alias) \
201:      name proto __asm__ (__ASMNAME (#alias)) __THROWNL
202: # endif
203: # define __ASMNAME(cname)  __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
204: # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
205: 
206: /*
207: #elif __SOME_OTHER_COMPILER__
208: 
209: # define __REDIRECT(name, proto, alias) name proto; \
210:         _Pragma("let " #name " = " #alias)
211: */
212: #endif
213: 
214: /* GCC has various useful declarations that can be made with the
215:    `__attribute__' syntax.  All of the ways we use this do fine if
216:    they are omitted for compilers that don't understand it. */
217: #if !defined __GNUC__ || __GNUC__ < 2
218: # define __attribute__(xyz)     /* Ignore */
219: #endif
220: 
221: /* At some point during the gcc 2.96 development the `malloc' attribute
222:    for functions was introduced.  We don't want to use it unconditionally
223:    (although this would be possible) since it generates warnings.  */
224: #if __GNUC_PREREQ (2,96)
225: # define __attribute_malloc__ __attribute__ ((__malloc__))
226: #else
227: # define __attribute_malloc__ /* Ignore */
228: #endif
229: 
230: /* At some point during the gcc 2.96 development the `pure' attribute
231:    for functions was introduced.  We don't want to use it unconditionally
232:    (although this would be possible) since it generates warnings.  */
233: #if __GNUC_PREREQ (2,96)
234: # define __attribute_pure__ __attribute__ ((__pure__))
235: #else
236: # define __attribute_pure__ /* Ignore */
237: #endif
238: 
239: /* This declaration tells the compiler that the value is constant.  */
240: #if __GNUC_PREREQ (2,5)
241: # define __attribute_const__ __attribute__ ((__const__))
242: #else
243: # define __attribute_const__ /* Ignore */
244: #endif
245: 
246: /* At some point during the gcc 3.1 development the `used' attribute
247:    for functions was introduced.  We don't want to use it unconditionally
248:    (although this would be possible) since it generates warnings.  */
249: #if __GNUC_PREREQ (3,1)
250: # define __attribute_used__ __attribute__ ((__used__))
251: # define __attribute_noinline__ __attribute__ ((__noinline__))
252: #else
253: # define __attribute_used__ __attribute__ ((__unused__))
254: # define __attribute_noinline__ /* Ignore */
255: #endif
256: 
257: /* gcc allows marking deprecated functions.  */
258: #if __GNUC_PREREQ (3,2)
259: # define __attribute_deprecated__ __attribute__ ((__deprecated__))
260: #else
261: # define __attribute_deprecated__ /* Ignore */
262: #endif
263: 
264: /* At some point during the gcc 2.8 development the `format_arg' attribute
265:    for functions was introduced.  We don't want to use it unconditionally
266:    (although this would be possible) since it generates warnings.
267:    If several `format_arg' attributes are given for the same function, in
268:    gcc-3.0 and older, all but the last one are ignored.  In newer gccs,
269:    all designated arguments are considered.  */
270: #if __GNUC_PREREQ (2,8)
271: # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
272: #else
273: # define __attribute_format_arg__(x) /* Ignore */
274: #endif
275: 
276: /* At some point during the gcc 2.97 development the `strfmon' format
277:    attribute for functions was introduced.  We don't want to use it
278:    unconditionally (although this would be possible) since it
279:    generates warnings.  */
280: #if __GNUC_PREREQ (2,97)
281: # define __attribute_format_strfmon__(a,b) \
282:   __attribute__ ((__format__ (__strfmon__, a, b)))
283: #else
284: # define __attribute_format_strfmon__(a,b) /* Ignore */
285: #endif
286: 
287: /* The nonull function attribute allows to mark pointer parameters which
288:    must not be NULL.  */
289: #if __GNUC_PREREQ (3,3)
290: # define __nonnull(params) __attribute__ ((__nonnull__ params))
291: #else
292: # define __nonnull(params)
293: #endif
294: 
295: /* If fortification mode, we warn about unused results of certain
296:    function calls which can lead to problems.  */
297: #if __GNUC_PREREQ (3,4)
298: # define __attribute_warn_unused_result__ \
299:    __attribute__ ((__warn_unused_result__))
300: # if __USE_FORTIFY_LEVEL > 0
301: #  define __wur __attribute_warn_unused_result__
302: # endif
303: #else
304: # define __attribute_warn_unused_result__ /* empty */
305: #endif
306: #ifndef __wur
307: # define __wur /* Ignore */
308: #endif
309: 
310: /* Forces a function to be always inlined.  */
311: #if __GNUC_PREREQ (3,2)
312: # define __always_inline __inline __attribute__ ((__always_inline__))
313: #else
314: # define __always_inline __inline
315: #endif
316: 
317: /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
318:    inline semantics, unless -fgnu89-inline is used.  */
319: #if !defined __cplusplus || __GNUC_PREREQ (4,3)
320: # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
321: #  define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
322: #  if __GNUC_PREREQ (4,3)
323: #   define __extern_always_inline \
324:   extern __always_inline __attribute__ ((__gnu_inline__, __artificial__))
325: #  else
326: #   define __extern_always_inline \
327:   extern __always_inline __attribute__ ((__gnu_inline__))
328: #  endif
329: # else
330: #  define __extern_inline extern __inline
331: #  if __GNUC_PREREQ (4,3)
332: #   define __extern_always_inline \
333:   extern __always_inline __attribute__ ((__artificial__))
334: #  else
335: #   define __extern_always_inline extern __always_inline
336: #  endif
337: # endif
338: #endif
339: 
340: /* GCC 4.3 and above allow passing all anonymous arguments of an
341:    __extern_always_inline function to some other vararg function.  */
342: #if __GNUC_PREREQ (4,3)
343: # define __va_arg_pack() __builtin_va_arg_pack ()
344: # define __va_arg_pack_len() __builtin_va_arg_pack_len ()
345: #endif
346: 
347: /* It is possible to compile containing GCC extensions even if GCC is
348:    run in pedantic mode if the uses are carefully marked using the
349:    `__extension__' keyword.  But this is not generally available before
350:    version 2.8.  */
351: #if !__GNUC_PREREQ (2,8)
352: # define __extension__          /* Ignore */
353: #endif
354: 
355: /* __restrict is known in EGCS 1.2 and above. */
356: #if !__GNUC_PREREQ (2,92)
357: # define __restrict     /* Ignore */
358: #endif
359: 
360: /* ISO C99 also allows to declare arrays as non-overlapping.  The syntax is
361:      array_name[restrict]
362:    GCC 3.1 supports this.  */
363: #if __GNUC_PREREQ (3,1) && !defined __GNUG__
364: # define __restrict_arr __restrict
365: #else
366: # ifdef __GNUC__
367: #  define __restrict_arr        /* Not supported in old GCC.  */
368: # else
369: #  if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
370: #   define __restrict_arr       restrict
371: #  else
372: /* Some other non-C99 compiler.  */
373: #   define __restrict_arr       /* Not supported.  */
374: #  endif
375: # endif
376: #endif
377: 
378: #include <bits/wordsize.h>
379: 
380: #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
381: # define __LDBL_COMPAT 1
382: # ifdef __REDIRECT
383: #  define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
384: #  define __LDBL_REDIR(name, proto) \
385:   __LDBL_REDIR1 (name, proto, __nldbl_##name)
386: #  define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
387: #  define __LDBL_REDIR_NTH(name, proto) \
388:   __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
389: #  define __LDBL_REDIR1_DECL(name, alias) \
390:   extern __typeof (name) name __asm (__ASMNAME (#alias));
391: #  define __LDBL_REDIR_DECL(name) \
392:   extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
393: #  define __REDIRECT_LDBL(name, proto, alias) \
394:   __LDBL_REDIR1 (name, proto, __nldbl_##alias)
395: #  define __REDIRECT_NTH_LDBL(name, proto, alias) \
396:   __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
397: # endif
398: #endif
399: #if !defined __LDBL_COMPAT || !defined __REDIRECT
400: # define __LDBL_REDIR1(name, proto, alias) name proto
401: # define __LDBL_REDIR(name, proto) name proto
402: # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
403: # define __LDBL_REDIR_NTH(name, proto) name proto __THROW
404: # define __LDBL_REDIR_DECL(name)
405: # ifdef __REDIRECT
406: #  define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
407: #  define __REDIRECT_NTH_LDBL(name, proto, alias) \
408:   __REDIRECT_NTH (name, proto, alias)
409: # endif
410: #endif
411: 
412: #endif   /* sys/cdefs.h */
413: 

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