239 lines
7.5 KiB
C
239 lines
7.5 KiB
C
/* Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _SYS_CDEFS_H
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#define _SYS_CDEFS_H 1
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/* We are almost always included from features.h. */
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#ifndef _FEATURES_H
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# include <features.h>
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#endif
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/* The GNU libc does not support any K&R compilers or the traditional mode
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of ISO C compilers anymore. Check for some of the combinations not
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anymore supported. */
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#if defined __GNUC__ && !defined __STDC__
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# error "You need a ISO C conforming compiler to use the glibc headers"
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#endif
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#define __FBSDID(x) /* nothing */
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/* Some user header file might have defined this before. */
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#undef __P
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#undef __PMT
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#ifdef __GNUC__
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/* GCC can always grok prototypes. For C++ programs we add throw()
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to help it optimize the function calls. But this works only with
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gcc 2.8.x and egcs. */
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# if defined __cplusplus && __GNUC_PREREQ (2,8)
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# define __THROW throw ()
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# else
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# define __THROW
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# endif
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# define __P(args) args __THROW
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/* This macro will be used for functions which might take C++ callback
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functions. */
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# define __PMT(args) args
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#else /* Not GCC. */
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# define __inline /* No inline functions. */
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# define __THROW
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# define __P(args) args
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# define __PMT(args) args
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# define __const const
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# define __signed signed
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# define __volatile volatile
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#endif /* GCC. */
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/* For these things, GCC behaves the ANSI way normally,
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and the non-ANSI way under -traditional. */
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#define __CONCAT(x,y) x ## y
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#define __STRING(x) #x
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/* This is not a typedef so `const __ptr_t' does the right thing. */
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#define __ptr_t void *
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#define __long_double_t long double
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/* C++ needs to know that types and declarations are C, not C++. */
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#ifdef __cplusplus
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# define __BEGIN_DECLS extern "C" {
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# define __END_DECLS }
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#else
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# define __BEGIN_DECLS
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# define __END_DECLS
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#endif
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/* Support for bounded pointers. */
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#ifndef __BOUNDED_POINTERS__
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# define __bounded /* nothing */
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# define __unbounded /* nothing */
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# define __ptrvalue /* nothing */
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#endif
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/* Support for flexible arrays. */
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#if __GNUC_PREREQ (2,97)
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/* GCC 2.97 supports C99 flexible array members. */
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# define __flexarr []
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#else
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# ifdef __GNUC__
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# define __flexarr [0]
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# else
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# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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# define __flexarr []
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# else
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/* Some other non-C99 compiler. Approximate with [1]. */
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# define __flexarr [1]
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# endif
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# endif
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#endif
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/* __asm__ ("xyz") is used throughout the headers to rename functions
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at the assembly language level. This is wrapped by the __REDIRECT
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macro, in order to support compilers that can do this some other
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way. When compilers don't support asm-names at all, we have to do
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preprocessor tricks instead (which don't have exactly the right
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semantics, but it's the best we can do).
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Example:
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int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
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#if defined __GNUC__ && __GNUC__ >= 2
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# define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
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# define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
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# define __ASMNAME2(prefix, cname) __STRING (prefix) cname
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/*
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#elif __SOME_OTHER_COMPILER__
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# define __REDIRECT(name, proto, alias) name proto; \
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_Pragma("let " #name " = " #alias)
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*/
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#endif
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/* GCC has various useful declarations that can be made with the
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`__attribute__' syntax. All of the ways we use this do fine if
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they are omitted for compilers that don't understand it. */
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#if !defined __GNUC__ || __GNUC__ < 2
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# define __attribute__(xyz) /* Ignore */
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#endif
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/* At some point during the gcc 2.96 development the `malloc' attribute
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for functions was introduced. We don't want to use it unconditionally
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(although this would be possible) since it generates warnings. */
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#if __GNUC_PREREQ (2,96)
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# define __attribute_malloc__ __attribute__ ((__malloc__))
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#else
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# define __attribute_malloc__ /* Ignore */
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#endif
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/* At some point during the gcc 2.96 development the `pure' attribute
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for functions was introduced. We don't want to use it unconditionally
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(although this would be possible) since it generates warnings. */
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#if __GNUC_PREREQ (2,96)
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# define __attribute_pure__ __attribute__ ((__pure__))
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#else
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# define __attribute_pure__ /* Ignore */
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#endif
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/* At some point during the gcc 3.1 development the `used' attribute
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for functions was introduced. We don't want to use it unconditionally
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(although this would be possible) since it generates warnings. */
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#if __GNUC_PREREQ (3,1)
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# define __attribute_used__ __attribute__ ((__used__))
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# define __attribute_noinline__ __attribute__ ((__noinline__))
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#else
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# define __attribute_used__ __attribute__ ((__unused__))
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# define __attribute_noinline__ /* Ignore */
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#endif
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/* At some point during the gcc 2.8 development the `format_arg' attribute
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for functions was introduced. We don't want to use it unconditionally
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(although this would be possible) since it generates warnings.
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If several `format_arg' attributes are given for the same function, in
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gcc-3.0 and older, all but the last one are ignored. In newer gccs,
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all designated arguments are considered. */
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#if __GNUC_PREREQ (2,8)
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# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
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#else
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# define __attribute_format_arg__(x) /* Ignore */
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#endif
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/* At some point during the gcc 2.97 development the `strfmon' format
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attribute for functions was introduced. We don't want to use it
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unconditionally (although this would be possible) since it
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generates warnings. */
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#if __GNUC_PREREQ (2,97)
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# define __attribute_format_strfmon__(a,b) \
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__attribute__ ((__format__ (__strfmon__, a, b)))
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#else
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# define __attribute_format_strfmon__(a,b) /* Ignore */
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#endif
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/* It is possible to compile containing GCC extensions even if GCC is
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run in pedantic mode if the uses are carefully marked using the
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`__extension__' keyword. But this is not generally available before
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version 2.8. */
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#if !__GNUC_PREREQ (2,8)
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# define __extension__ /* Ignore */
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#endif
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/* __restrict is known in EGCS 1.2 and above. */
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#if !__GNUC_PREREQ (2,92)
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# define __restrict /* Ignore */
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#endif
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/* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
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array_name[restrict]
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GCC 3.1 supports this. */
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#if __GNUC_PREREQ (3,1) && !defined __GNUG__
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# define __restrict_arr __restrict
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#else
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# ifdef __GNUC__
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# define __restrict_arr /* Not supported in old GCC. */
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# else
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# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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# define __restrict_arr restrict
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# else
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/* Some other non-C99 compiler. */
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# define __restrict_arr /* Not supported. */
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# endif
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# endif
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#endif
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/* The nonull function attribute allows to mark pointer parameters which
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must not be NULL. */
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#if __GNUC_PREREQ (3,3)
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# define __nonnull(params) __attribute__ ((__nonnull__ params))
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#else
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# define __nonnull(params)
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#endif
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#endif /* sys/cdefs.h */
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