diff options
Diffstat (limited to 'include/sys/cdefs.h')
| -rw-r--r-- | include/sys/cdefs.h | 222 |
1 files changed, 195 insertions, 27 deletions
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h index 7df9f1e52..02454ee4d 100644 --- a/include/sys/cdefs.h +++ b/include/sys/cdefs.h @@ -1,49 +1,217 @@ +/* Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. -#ifndef __SYS_CDEFS_H -#define __SYS_CDEFS_H -#include <features.h> + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. -#if defined (__STDC__) && __STDC__ + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. -#define __CONCAT(x,y) x ## y -#define __STRING(x) #x + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _SYS_CDEFS_H +#define _SYS_CDEFS_H 1 + +/* We are almost always included from features.h. */ +#ifndef _FEATURES_H +# include <features.h> +#endif + +/* The GNU libc does not support any K&R compilers or the traditional mode + of ISO C compilers anymore. Check for some of the combinations not + anymore supported. */ +#if defined __GNUC__ && !defined __STDC__ +# error "You need a ISO C conforming compiler to use the glibc headers" +#endif + +/* Some user header file might have defined this before. */ +#undef __P +#undef __PMT + +#ifdef __GNUC__ + +/* GCC can always grok prototypes. For C++ programs we add throw() + to help it optimize the function calls. But this works only with + gcc 2.8.x and egcs. */ +# if defined __cplusplus && __GNUC_PREREQ (2,8) +# define __THROW throw () +# else +# define __THROW +# endif +# define __P(args) args __THROW +/* This macro will be used for functions which might take C++ callback + functions. */ +# define __PMT(args) args + +#else /* Not GCC. */ + +# define __inline /* No inline functions. */ + +# define __THROW +# define __P(args) args +# define __PMT(args) args + +# define __const const +# define __signed signed +# define __volatile volatile + +#endif /* GCC. */ + +/* For these things, GCC behaves the ANSI way normally, + and the non-ANSI way under -traditional. */ + +#define __CONCAT(x,y) x ## y +#define __STRING(x) #x /* This is not a typedef so `const __ptr_t' does the right thing. */ #define __ptr_t void * +#define __long_double_t long double + + +/* C++ needs to know that types and declarations are C, not C++. */ +#ifdef __cplusplus +# define __BEGIN_DECLS extern "C" { +# define __END_DECLS } +#else +# define __BEGIN_DECLS +# define __END_DECLS +#endif + +/* Support for bounded pointers. */ +#ifndef __BOUNDED_POINTERS__ +# define __bounded /* nothing */ +# define __unbounded /* nothing */ +# define __ptrvalue /* nothing */ +#endif + + +/* Support for flexible arrays. */ +#if __GNUC_PREREQ (2,97) +/* GCC 2.97 supports C99 flexible array members. */ +# define __flexarr [] #else +# ifdef __GNUC__ +# define __flexarr [0] +# else +# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L +# define __flexarr [] +# else +/* Some other non-C99 compiler. Approximate with [1]. */ +# define __flexarr [1] +# endif +# endif +#endif + + +/* __asm__ ("xyz") is used throughout the headers to rename functions + at the assembly language level. This is wrapped by the __REDIRECT + macro, in order to support compilers that can do this some other + way. When compilers don't support asm-names at all, we have to do + preprocessor tricks instead (which don't have exactly the right + semantics, but it's the best we can do). + + Example: + int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ -#define __CONCAT(x,y) x/**/y -#define __STRING(x) "x" +#if defined __GNUC__ && __GNUC__ >= 2 -#define __ptr_t char * +# define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) +# define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) +# define __ASMNAME2(prefix, cname) __STRING (prefix) cname +/* +#elif __SOME_OTHER_COMPILER__ + +# define __REDIRECT(name, proto, alias) name proto; \ + _Pragma("let " #name " = " #alias) +*/ #endif -/* C++ needs to know that types and declarations are C, not C++. */ -#ifdef __cplusplus -# define __BEGIN_DECLS extern "C" { -# define __END_DECLS } +/* GCC has various useful declarations that can be made with the + `__attribute__' syntax. All of the ways we use this do fine if + they are omitted for compilers that don't understand it. */ +#if !defined __GNUC__ || __GNUC__ < 2 +# define __attribute__(xyz) /* Ignore */ +#endif + +/* At some point during the gcc 2.96 development the `malloc' attribute + for functions was introduced. We don't want to use it unconditionally + (although this would be possible) since it generates warnings. */ +#if __GNUC_PREREQ (2,96) +# define __attribute_malloc__ __attribute__ ((__malloc__)) #else -# define __BEGIN_DECLS -# define __END_DECLS +# define __attribute_malloc__ /* Ignore */ #endif -/* GNUish things */ -#define __CONSTVALUE -#define __CONSTVALUE2 +/* At some point during the gcc 2.96 development the `pure' attribute + for functions was introduced. We don't want to use it unconditionally + (although this would be possible) since it generates warnings. */ +#if __GNUC_PREREQ (2,96) +# define __attribute_pure__ __attribute__ ((__pure__)) +#else +# define __attribute_pure__ /* Ignore */ +#endif -#ifdef __GNUC__ -/* GCC can always grok prototypes. For C++ programs we add throw() - to help it optimize the function calls. But this works only with - gcc 2.8.x and egcs. */ -#if defined __cplusplus && __GNUC_PREREQ (2,8) -#define __THROW throw() +/* At some point during the gcc 2.8 development the `format_arg' attribute + for functions was introduced. We don't want to use it unconditionally + (although this would be possible) since it generates warnings. + If several `format_arg' attributes are given for the same function, in + gcc-3.0 and older, all but the last one are ignored. In newer gccs, + all designated arguments are considered. */ +#if __GNUC_PREREQ (2,8) +# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) #else -#define __THROW +# define __attribute_format_arg__(x) /* Ignore */ #endif -#else /* GCC */ -#define __THROW + +/* At some point during the gcc 2.97 development the `strfmon' format + attribute for functions was introduced. We don't want to use it + unconditionally (although this would be possible) since it + generates warnings. */ +#if __GNUC_PREREQ (2,97) +# define __attribute_format_strfmon__(a,b) \ + __attribute__ ((__format__ (__strfmon__, a, b))) +#else +# define __attribute_format_strfmon__(a,b) /* Ignore */ #endif +/* It is possible to compile containing GCC extensions even if GCC is + run in pedantic mode if the uses are carefully marked using the + `__extension__' keyword. But this is not generally available before + version 2.8. */ +#if !__GNUC_PREREQ (2,8) +# define __extension__ /* Ignore */ #endif + +/* __restrict is known in EGCS 1.2 and above. */ +#if !__GNUC_PREREQ (2,92) +# define __restrict /* Ignore */ +#endif + +/* ISO C99 also allows to declare arrays as non-overlapping. The syntax is + array_name[restrict] + GCC 3.1 supports this. */ +#if __GNUC_PREREQ (3,1) && !defined __GNUG__ +# define __restrict_arr __restrict +#else +# ifdef __GNUC__ +# define __restrict_arr /* Not supported in old GCC. */ +# else +# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L +# define __restrict_arr restrict +# else +/* Some other non-C99 compiler. */ +# define __restrict_arr /* Not supported. */ +# endif +# endif +#endif + +#endif /* sys/cdefs.h */ |