modernc.org/cc@v1.0.1/v2/headers/linux_arm/usr/include/arm-linux-gnueabihf/sys/cdefs.h (about)

     1  /* Copyright (C) 1992-2016 Free Software Foundation, Inc.
     2     This file is part of the GNU C Library.
     3  
     4     The GNU C Library is free software; you can redistribute it and/or
     5     modify it under the terms of the GNU Lesser General Public
     6     License as published by the Free Software Foundation; either
     7     version 2.1 of the License, or (at your option) any later version.
     8  
     9     The GNU C Library is distributed in the hope that it will be useful,
    10     but WITHOUT ANY WARRANTY; without even the implied warranty of
    11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12     Lesser General Public License for more details.
    13  
    14     You should have received a copy of the GNU Lesser General Public
    15     License along with the GNU C Library; if not, see
    16     <http://www.gnu.org/licenses/>.  */
    17  
    18  #ifndef	_SYS_CDEFS_H
    19  #define	_SYS_CDEFS_H	1
    20  
    21  /* We are almost always included from features.h. */
    22  #ifndef _FEATURES_H
    23  #include <features.h>
    24  #endif
    25  
    26  /* The GNU libc does not support any K&R compilers or the traditional mode
    27     of ISO C compilers anymore.  Check for some of the combinations not
    28     anymore supported.  */
    29  #if defined __GNUC__ && !defined __STDC__
    30  #error "You need a ISO C conforming compiler to use the glibc headers"
    31  #endif
    32  
    33  /* Some user header file might have defined this before.  */
    34  #undef	__P
    35  #undef	__PMT
    36  
    37  #ifdef __GNUC__
    38  
    39  /* All functions, except those with callbacks or those that
    40     synchronize memory, are leaf functions.  */
    41  #if __GNUC_PREREQ (4, 6) && !defined _LIBC
    42  #define __LEAF , __leaf__
    43  #define __LEAF_ATTR __attribute__ ((__leaf__))
    44  #else
    45  #define __LEAF
    46  #define __LEAF_ATTR
    47  #endif
    48  
    49  /* GCC can always grok prototypes.  For C++ programs we add throw()
    50     to help it optimize the function calls.  But this works only with
    51     gcc 2.8.x and egcs.  For gcc 3.2 and up we even mark C functions
    52     as non-throwing using a function attribute since programs can use
    53     the -fexceptions options for C code as well.  */
    54  #if !defined __cplusplus && __GNUC_PREREQ (3, 3)
    55  #define __THROW	__attribute__ ((__nothrow__ __LEAF))
    56  #define __THROWNL	__attribute__ ((__nothrow__))
    57  #define __NTH(fct)	__attribute__ ((__nothrow__ __LEAF)) fct
    58  #else
    59  #if defined __cplusplus && __GNUC_PREREQ (2,8)
    60  #define __THROW	throw ()
    61  #define __THROWNL	throw ()
    62  #define __NTH(fct)	__LEAF_ATTR fct throw ()
    63  #else
    64  #define __THROW
    65  #define __THROWNL
    66  #define __NTH(fct)	fct
    67  #endif
    68  #endif
    69  
    70  #else				/* Not GCC.  */
    71  
    72  #define __inline		/* No inline functions.  */
    73  
    74  #define __THROW
    75  #define __THROWNL
    76  #define __NTH(fct)	fct
    77  
    78  #endif				/* GCC.  */
    79  
    80  /* These two macros are not used in glibc anymore.  They are kept here
    81     only because some other projects expect the macros to be defined.  */
    82  #define __P(args)	args
    83  #define __PMT(args)	args
    84  
    85  /* For these things, GCC behaves the ANSI way normally,
    86     and the non-ANSI way under -traditional.  */
    87  
    88  #define __CONCAT(x,y)	x ## y
    89  #define __STRING(x)	#x
    90  
    91  /* This is not a typedef so `const __ptr_t' does the right thing.  */
    92  #define __ptr_t void *
    93  #define __long_double_t  long double
    94  
    95  /* C++ needs to know that types and declarations are C, not C++.  */
    96  #ifdef	__cplusplus
    97  #define __BEGIN_DECLS	extern "C" {
    98  #define __END_DECLS	}
    99  #else
   100  #define __BEGIN_DECLS
   101  #define __END_DECLS
   102  #endif
   103  
   104  /* The standard library needs the functions from the ISO C90 standard
   105     in the std namespace.  At the same time we want to be safe for
   106     future changes and we include the ISO C99 code in the non-standard
   107     namespace __c99.  The C++ wrapper header take case of adding the
   108     definitions to the global namespace.  */
   109  #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES
   110  #define __BEGIN_NAMESPACE_STD	namespace std {
   111  #define __END_NAMESPACE_STD	}
   112  #define __USING_NAMESPACE_STD(name) using std::name;
   113  #define __BEGIN_NAMESPACE_C99	namespace __c99 {
   114  #define __END_NAMESPACE_C99	}
   115  #define __USING_NAMESPACE_C99(name) using __c99::name;
   116  #else
   117  /* For compatibility we do not add the declarations into any
   118     namespace.  They will end up in the global namespace which is what
   119     old code expects.  */
   120  #define __BEGIN_NAMESPACE_STD
   121  #define __END_NAMESPACE_STD
   122  #define __USING_NAMESPACE_STD(name)
   123  #define __BEGIN_NAMESPACE_C99
   124  #define __END_NAMESPACE_C99
   125  #define __USING_NAMESPACE_C99(name)
   126  #endif
   127  
   128  /* Fortify support.  */
   129  #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
   130  #define __bos0(ptr) __builtin_object_size (ptr, 0)
   131  
   132  #if __GNUC_PREREQ (4,3)
   133  #define __warndecl(name, msg) \
   134    extern void name (void) __attribute__((__warning__ (msg)))
   135  #define __warnattr(msg) __attribute__((__warning__ (msg)))
   136  #define __errordecl(name, msg) \
   137    extern void name (void) __attribute__((__error__ (msg)))
   138  #else
   139  #define __warndecl(name, msg) extern void name (void)
   140  #define __warnattr(msg)
   141  #define __errordecl(name, msg) extern void name (void)
   142  #endif
   143  
   144  /* Support for flexible arrays.  */
   145  #if __GNUC_PREREQ (2,97)
   146  /* GCC 2.97 supports C99 flexible array members.  */
   147  #define __flexarr	[]
   148  #else
   149  #ifdef __GNUC__
   150  #define __flexarr	[0]
   151  #else
   152  #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
   153  #define __flexarr	[]
   154  #else
   155  /* Some other non-C99 compiler.  Approximate with [1].  */
   156  #define __flexarr	[1]
   157  #endif
   158  #endif
   159  #endif
   160  
   161  /* __asm__ ("xyz") is used throughout the headers to rename functions
   162     at the assembly language level.  This is wrapped by the __REDIRECT
   163     macro, in order to support compilers that can do this some other
   164     way.  When compilers don't support asm-names at all, we have to do
   165     preprocessor tricks instead (which don't have exactly the right
   166     semantics, but it's the best we can do).
   167  
   168     Example:
   169     int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
   170  
   171  #if defined __GNUC__ && __GNUC__ >= 2
   172  
   173  #define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
   174  #ifdef __cplusplus
   175  #define __REDIRECT_NTH(name, proto, alias) \
   176       name proto __THROW __asm__ (__ASMNAME (#alias))
   177  #define __REDIRECT_NTHNL(name, proto, alias) \
   178       name proto __THROWNL __asm__ (__ASMNAME (#alias))
   179  #else
   180  #define __REDIRECT_NTH(name, proto, alias) \
   181       name proto __asm__ (__ASMNAME (#alias)) __THROW
   182  #define __REDIRECT_NTHNL(name, proto, alias) \
   183       name proto __asm__ (__ASMNAME (#alias)) __THROWNL
   184  #endif
   185  #define __ASMNAME(cname)  __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
   186  #define __ASMNAME2(prefix, cname) __STRING (prefix) cname
   187  
   188  /*
   189  #elif __SOME_OTHER_COMPILER__
   190  
   191  # define __REDIRECT(name, proto, alias) name proto; \
   192  	_Pragma("let " #name " = " #alias)
   193  */
   194  #endif
   195  
   196  /* GCC has various useful declarations that can be made with the
   197     `__attribute__' syntax.  All of the ways we use this do fine if
   198     they are omitted for compilers that don't understand it. */
   199  #if !defined __GNUC__ || __GNUC__ < 2
   200  #define __attribute__(xyz)	/* Ignore */
   201  #endif
   202  
   203  /* At some point during the gcc 2.96 development the `malloc' attribute
   204     for functions was introduced.  We don't want to use it unconditionally
   205     (although this would be possible) since it generates warnings.  */
   206  #if __GNUC_PREREQ (2,96)
   207  #define __attribute_malloc__ __attribute__ ((__malloc__))
   208  #else
   209  #define __attribute_malloc__	/* Ignore */
   210  #endif
   211  
   212  /* Tell the compiler which arguments to an allocation function
   213     indicate the size of the allocation.  */
   214  #if __GNUC_PREREQ (4, 3)
   215  #define __attribute_alloc_size__(params) \
   216    __attribute__ ((__alloc_size__ params))
   217  #else
   218  #define __attribute_alloc_size__(params)	/* Ignore.  */
   219  #endif
   220  
   221  /* At some point during the gcc 2.96 development the `pure' 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_pure__ __attribute__ ((__pure__))
   226  #else
   227  #define __attribute_pure__	/* Ignore */
   228  #endif
   229  
   230  /* This declaration tells the compiler that the value is constant.  */
   231  #if __GNUC_PREREQ (2,5)
   232  #define __attribute_const__ __attribute__ ((__const__))
   233  #else
   234  #define __attribute_const__	/* Ignore */
   235  #endif
   236  
   237  /* At some point during the gcc 3.1 development the `used' attribute
   238     for functions was introduced.  We don't want to use it unconditionally
   239     (although this would be possible) since it generates warnings.  */
   240  #if __GNUC_PREREQ (3,1)
   241  #define __attribute_used__ __attribute__ ((__used__))
   242  #define __attribute_noinline__ __attribute__ ((__noinline__))
   243  #else
   244  #define __attribute_used__ __attribute__ ((__unused__))
   245  #define __attribute_noinline__	/* Ignore */
   246  #endif
   247  
   248  /* gcc allows marking deprecated functions.  */
   249  #if __GNUC_PREREQ (3,2)
   250  #define __attribute_deprecated__ __attribute__ ((__deprecated__))
   251  #else
   252  #define __attribute_deprecated__	/* Ignore */
   253  #endif
   254  
   255  /* At some point during the gcc 2.8 development the `format_arg' attribute
   256     for functions was introduced.  We don't want to use it unconditionally
   257     (although this would be possible) since it generates warnings.
   258     If several `format_arg' attributes are given for the same function, in
   259     gcc-3.0 and older, all but the last one are ignored.  In newer gccs,
   260     all designated arguments are considered.  */
   261  #if __GNUC_PREREQ (2,8)
   262  #define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
   263  #else
   264  #define __attribute_format_arg__(x)	/* Ignore */
   265  #endif
   266  
   267  /* At some point during the gcc 2.97 development the `strfmon' format
   268     attribute for functions was introduced.  We don't want to use it
   269     unconditionally (although this would be possible) since it
   270     generates warnings.  */
   271  #if __GNUC_PREREQ (2,97)
   272  #define __attribute_format_strfmon__(a,b) \
   273    __attribute__ ((__format__ (__strfmon__, a, b)))
   274  #else
   275  #define __attribute_format_strfmon__(a,b)	/* Ignore */
   276  #endif
   277  
   278  /* The nonull function attribute allows to mark pointer parameters which
   279     must not be NULL.  */
   280  #if __GNUC_PREREQ (3,3)
   281  #define __nonnull(params) __attribute__ ((__nonnull__ params))
   282  #else
   283  #define __nonnull(params)
   284  #endif
   285  
   286  /* If fortification mode, we warn about unused results of certain
   287     function calls which can lead to problems.  */
   288  #if __GNUC_PREREQ (3,4)
   289  #define __attribute_warn_unused_result__ \
   290     __attribute__ ((__warn_unused_result__))
   291  #if __USE_FORTIFY_LEVEL > 0
   292  #define __wur __attribute_warn_unused_result__
   293  #endif
   294  #else
   295  #define __attribute_warn_unused_result__	/* empty */
   296  #endif
   297  #ifndef __wur
   298  #define __wur			/* Ignore */
   299  #endif
   300  
   301  /* Forces a function to be always inlined.  */
   302  #if __GNUC_PREREQ (3,2)
   303  /* The Linux kernel defines __always_inline in stddef.h (283d7573), and
   304     it conflicts with this definition.  Therefore undefine it first to
   305     allow either header to be included first.  */
   306  #undef __always_inline
   307  #define __always_inline __inline __attribute__ ((__always_inline__))
   308  #else
   309  #undef __always_inline
   310  #define __always_inline __inline
   311  #endif
   312  
   313  /* Associate error messages with the source location of the call site rather
   314     than with the source location inside the function.  */
   315  #if __GNUC_PREREQ (4,3)
   316  #define __attribute_artificial__ __attribute__ ((__artificial__))
   317  #else
   318  #define __attribute_artificial__	/* Ignore */
   319  #endif
   320  
   321  /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
   322     inline semantics, unless -fgnu89-inline is used.  Using __GNUC_STDC_INLINE__
   323     or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
   324     older than 4.3 may define these macros and still not guarantee GNU inlining
   325     semantics.
   326  
   327     clang++ identifies itself as gcc-4.2, but has support for GNU inlining
   328     semantics, that can be checked fot by using the __GNUC_STDC_INLINE_ and
   329     __GNUC_GNU_INLINE__ macro definitions.  */
   330  #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
   331       || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \
   332  			       || defined __GNUC_GNU_INLINE__)))
   333  #if defined __GNUC_STDC_INLINE__ || defined __cplusplus
   334  #define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
   335  #define __extern_always_inline \
   336    extern __always_inline __attribute__ ((__gnu_inline__))
   337  #else
   338  #define __extern_inline extern __inline
   339  #define __extern_always_inline extern __always_inline
   340  #endif
   341  #endif
   342  
   343  #ifdef __extern_always_inline
   344  #define __fortify_function __extern_always_inline __attribute_artificial__
   345  #endif
   346  
   347  /* GCC 4.3 and above allow passing all anonymous arguments of an
   348     __extern_always_inline function to some other vararg function.  */
   349  #if __GNUC_PREREQ (4,3)
   350  #define __va_arg_pack() __builtin_va_arg_pack ()
   351  #define __va_arg_pack_len() __builtin_va_arg_pack_len ()
   352  #endif
   353  
   354  /* It is possible to compile containing GCC extensions even if GCC is
   355     run in pedantic mode if the uses are carefully marked using the
   356     `__extension__' keyword.  But this is not generally available before
   357     version 2.8.  */
   358  #if !__GNUC_PREREQ (2,8)
   359  #define __extension__		/* Ignore */
   360  #endif
   361  
   362  /* __restrict is known in EGCS 1.2 and above. */
   363  #if !__GNUC_PREREQ (2,92)
   364  #define __restrict		/* Ignore */
   365  #endif
   366  
   367  /* ISO C99 also allows to declare arrays as non-overlapping.  The syntax is
   368       array_name[restrict]
   369     GCC 3.1 supports this.  */
   370  #if __GNUC_PREREQ (3,1) && !defined __GNUG__
   371  #define __restrict_arr	__restrict
   372  #else
   373  #ifdef __GNUC__
   374  #define __restrict_arr		/* Not supported in old GCC.  */
   375  #else
   376  #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
   377  #define __restrict_arr	restrict
   378  #else
   379  /* Some other non-C99 compiler.  */
   380  #define __restrict_arr		/* Not supported.  */
   381  #endif
   382  #endif
   383  #endif
   384  
   385  #if __GNUC__ >= 3
   386  #define __glibc_unlikely(cond)	__builtin_expect ((cond), 0)
   387  #define __glibc_likely(cond)	__builtin_expect ((cond), 1)
   388  #else
   389  #define __glibc_unlikely(cond)	(cond)
   390  #define __glibc_likely(cond)	(cond)
   391  #endif
   392  
   393  #if (!defined _Noreturn \
   394       && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
   395       &&  !__GNUC_PREREQ (4,7))
   396  #if __GNUC_PREREQ (2,8)
   397  #define _Noreturn __attribute__ ((__noreturn__))
   398  #else
   399  #define _Noreturn
   400  #endif
   401  #endif
   402  
   403  #if (!defined _Static_assert && !defined __cplusplus \
   404       && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
   405       && (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__))
   406  #define _Static_assert(expr, diagnostic) \
   407      extern int (*__Static_assert_function (void)) \
   408        [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
   409  #endif
   410  
   411  #include <bits/wordsize.h>
   412  
   413  #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
   414  #define __LDBL_COMPAT 1
   415  #ifdef __REDIRECT
   416  #define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
   417  #define __LDBL_REDIR(name, proto) \
   418    __LDBL_REDIR1 (name, proto, __nldbl_##name)
   419  #define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
   420  #define __LDBL_REDIR_NTH(name, proto) \
   421    __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
   422  #define __LDBL_REDIR1_DECL(name, alias) \
   423    extern __typeof (name) name __asm (__ASMNAME (#alias));
   424  #define __LDBL_REDIR_DECL(name) \
   425    extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
   426  #define __REDIRECT_LDBL(name, proto, alias) \
   427    __LDBL_REDIR1 (name, proto, __nldbl_##alias)
   428  #define __REDIRECT_NTH_LDBL(name, proto, alias) \
   429    __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
   430  #endif
   431  #endif
   432  #if !defined __LDBL_COMPAT || !defined __REDIRECT
   433  #define __LDBL_REDIR1(name, proto, alias) name proto
   434  #define __LDBL_REDIR(name, proto) name proto
   435  #define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
   436  #define __LDBL_REDIR_NTH(name, proto) name proto __THROW
   437  #define __LDBL_REDIR_DECL(name)
   438  #ifdef __REDIRECT
   439  #define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
   440  #define __REDIRECT_NTH_LDBL(name, proto, alias) \
   441    __REDIRECT_NTH (name, proto, alias)
   442  #endif
   443  #endif
   444  
   445  #endif				/* sys/cdefs.h */