mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-05 21:00:05 +00:00
254 lines
8.2 KiB
C++
254 lines
8.2 KiB
C++
/* Copyright (C) 1992-2001, 2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
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
|
|
|
|
|
|
/* The standard library needs the functions from the ISO C90 standard
|
|
in the std namespace. At the same time we want to be safe for
|
|
future changes and we include the ISO C99 code in the non-standard
|
|
namespace __c99. The C++ wrapper header take case of adding the
|
|
definitions to the global namespace. */
|
|
#if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES
|
|
# define __BEGIN_NAMESPACE_STD namespace std {
|
|
# define __END_NAMESPACE_STD }
|
|
# define __USING_NAMESPACE_STD(name) using std::name;
|
|
# define __BEGIN_NAMESPACE_C99 namespace __c99 {
|
|
# define __END_NAMESPACE_C99 }
|
|
# define __USING_NAMESPACE_C99(name) using __c99::name;
|
|
#else
|
|
/* For compatibility we do not add the declarations into any
|
|
namespace. They will end up in the global namespace which is what
|
|
old code expects. */
|
|
# define __BEGIN_NAMESPACE_STD
|
|
# define __END_NAMESPACE_STD
|
|
# define __USING_NAMESPACE_STD(name)
|
|
# define __BEGIN_NAMESPACE_C99
|
|
# define __END_NAMESPACE_C99
|
|
# define __USING_NAMESPACE_C99(name)
|
|
#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); */
|
|
|
|
#if defined __GNUC__ && __GNUC__ >= 2
|
|
|
|
# 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
|
|
|
|
/* 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 __attribute_malloc__ /* Ignore */
|
|
#endif
|
|
|
|
/* 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
|
|
|
|
/* At some point during the gcc 3.1 development the `used' 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 (3,1)
|
|
# define __attribute_used__ __attribute__ ((__used__))
|
|
# define __attribute_noinline__ __attribute__ ((__noinline__))
|
|
#else
|
|
# define __attribute_used__ __attribute__ ((__unused__))
|
|
# define __attribute_noinline__ /* Ignore */
|
|
#endif
|
|
|
|
/* 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 __attribute_format_arg__(x) /* Ignore */
|
|
#endif
|
|
|
|
/* 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 */
|