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157 lines
4.5 KiB
C
157 lines
4.5 KiB
C
/* Copyright (C) 1992,93,94,95,96,97,98,99 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 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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/* 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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# if (defined __STDC__ && __STDC__) || defined __cplusplus
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# define __P(args) args
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# define __PMT(args) args
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# else /* Not ANSI C or C++. */
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# define __P(args) () /* No prototypes. */
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# define __PMT(args) ()
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# endif /* ANSI C or C++. */
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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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#if defined __STDC__ && __STDC__
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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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#else
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# define __CONCAT(x,y) x/**/y
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# define __STRING(x) "x"
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# define __ptr_t char *
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# define __long_double_t long double
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/* The BSD header files use the ANSI keywords unmodified (this means that
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old programs may lose if they use the new keywords as identifiers), but
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those names are not available under -traditional. We define them to
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their __ versions, which are taken care of above. */
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# ifdef __USE_BSD
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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
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#endif /* __STDC__ */
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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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/* __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, __P((__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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/* 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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#endif /* sys/cdefs.h */
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