Removed spurious warnings when compiling Objective-C

[thirdparty/gcc.git] / gcc / system.h

/* Get common system includes and various definitions and declarations based
   on autoconf macros.
   Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

GCC 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 General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */


#ifndef GCC_SYSTEM_H
#define GCC_SYSTEM_H

/* This is the location of the online document giving information how
   to report bugs. If you change this string, also check for strings
   not under control of the preprocessor.  */
#define GCCBUGURL "<URL:http://www.gnu.org/software/gcc/bugs.html>"

/* We must include stdarg.h/varargs.h before stdio.h.  */
#ifdef ANSI_PROTOTYPES
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#ifndef va_copy
# ifdef __va_copy
#   define va_copy(d,s)  __va_copy((d),(s))
# else
#   define va_copy(d,s)  ((d) = (s))
# endif
#endif

#ifdef HAVE_STDDEF_H
# include <stddef.h>
#endif

#include <stdio.h>

/* Define a generic NULL if one hasn't already been defined.  */
#ifndef NULL
#define NULL 0
#endif

/* The compiler is not a multi-threaded application and therefore we
   do not have to use the locking functions.  In fact, using the locking
   functions can cause the compiler to be significantly slower under
   I/O bound conditions (such as -g -O0 on very large source files).

   HAVE_DECL_PUTC_UNLOCKED actually indicates whether or not the stdio
   code is multi-thread safe by default.  If it is set to 0, then do
   not worry about using the _unlocked functions.
   
   fputs_unlocked, fwrite_unlocked, and fprintf_unlocked are
   extensions and need to be prototyped by hand (since we do not
   define _GNU_SOURCE).  */

#if defined HAVE_DECL_PUTC_UNLOCKED && HAVE_DECL_PUTC_UNLOCKED

# ifdef HAVE_PUTC_UNLOCKED
#  undef putc
#  define putc(C, Stream) putc_unlocked (C, Stream)
# endif
# ifdef HAVE_FPUTC_UNLOCKED
#  undef fputc
#  define fputc(C, Stream) fputc_unlocked (C, Stream)
# endif

# ifdef HAVE_FPUTS_UNLOCKED
#  undef fputs
#  define fputs(String, Stream) fputs_unlocked (String, Stream)
#  if defined (HAVE_DECL_FPUTS_UNLOCKED) && !HAVE_DECL_FPUTS_UNLOCKED
extern int fputs_unlocked PARAMS ((const char *, FILE *));
#  endif
# endif
# ifdef HAVE_FWRITE_UNLOCKED
#  undef fwrite
#  define fwrite(Ptr, Size, N, Stream) fwrite_unlocked (Ptr, Size, N, Stream)
#  if defined (HAVE_DECL_FWRITE_UNLOCKED) && !HAVE_DECL_FWRITE_UNLOCKED
extern int fwrite_unlocked PARAMS ((const PTR, size_t, size_t, FILE *));
#  endif
# endif
# ifdef HAVE_FPRINTF_UNLOCKED
#  undef fprintf
/* We can't use a function-like macro here because we don't know if
   we have varargs macros.  */
#  define fprintf fprintf_unlocked
#  if defined (HAVE_DECL_FPRINTF_UNLOCKED) && !HAVE_DECL_FPRINTF_UNLOCKED
extern int fprintf_unlocked PARAMS ((FILE *, const char *, ...));
#  endif
# endif

#endif

/* There are an extraordinary number of issues with <ctype.h>.
   The last straw is that it varies with the locale.  Use libiberty's
   replacement instead.  */
#include <safe-ctype.h>

#include <sys/types.h>

#include <errno.h>

#if !defined (errno) && defined (HAVE_DECL_ERRNO) && !HAVE_DECL_ERRNO
extern int errno;
#endif

#ifdef STRING_WITH_STRINGS
# include <string.h>
# include <strings.h>
#else
# ifdef HAVE_STRING_H
#  include <string.h>
# else
#  ifdef HAVE_STRINGS_H
#   include <strings.h>
#  endif
# endif
#endif

#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif

/* If we don't have an overriding definition, set SUCCESS_EXIT_CODE and
   FATAL_EXIT_CODE to EXIT_SUCCESS and EXIT_FAILURE respectively,
   or 0 and 1 if those macros are not defined.  */
#ifndef SUCCESS_EXIT_CODE
# ifdef EXIT_SUCCESS
#  define SUCCESS_EXIT_CODE EXIT_SUCCESS
# else
#  define SUCCESS_EXIT_CODE 0
# endif
#endif

#ifndef FATAL_EXIT_CODE
# ifdef EXIT_FAILURE
#  define FATAL_EXIT_CODE EXIT_FAILURE
# else
#  define FATAL_EXIT_CODE 1
# endif
#endif

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
/* We use this identifier later and it appears in some vendor param.h's.  */
# undef PREFETCH
#endif

#if HAVE_LIMITS_H
# include <limits.h>
#endif

/* Get definitions of HOST_WIDE_INT and HOST_WIDEST_INT.  */
#include "hwint.h"

/* A macro to determine whether a VALUE lies inclusively within a
   certain range without evaluating the VALUE more than once.  This
   macro won't warn if the VALUE is unsigned and the LOWER bound is
   zero, as it would e.g. with "VALUE >= 0 && ...".  Note the LOWER
   bound *is* evaluated twice, and LOWER must not be greater than
   UPPER.  However the bounds themselves can be either positive or
   negative.  */
#define IN_RANGE(VALUE, LOWER, UPPER) \
  ((unsigned HOST_WIDE_INT)((VALUE) - (LOWER)) <= ((UPPER) - (LOWER)))

/* Infrastructure for defining missing _MAX and _MIN macros.  Note that
   macros defined with these cannot be used in #if.  */

/* The extra casts work around common compiler bugs.  */
#define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
   It is necessary at least when t == time_t.  */
#define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \
                             ? ~ (t) 0 << (sizeof(t) * CHAR_BIT - 1) : (t) 0))
#define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t)))

/* Use that infrastructure to provide a few constants.  */
#ifndef UCHAR_MAX
# define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char)
#endif

#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  ifdef HAVE_TIME_H
#   include <time.h>
#  endif
# endif
#endif

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#else
# ifdef HAVE_SYS_FILE_H
#  include <sys/file.h>
# endif
#endif

#ifndef SEEK_SET
# define SEEK_SET 0
# define SEEK_CUR 1
# define SEEK_END 2
#endif
#ifndef F_OK
# define F_OK 0
# define X_OK 1
# define W_OK 2
# define R_OK 4
#endif
#ifndef O_RDONLY
# define O_RDONLY 0
#endif
#ifndef O_WRONLY
# define O_WRONLY 1
#endif

/* Some systems define these in, e.g., param.h.  We undefine these names
   here to avoid the warnings.  We prefer to use our definitions since we
   know they are correct.  */

#undef MIN
#undef MAX
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))

/* Returns the least number N such that N * Y >= X.  */
#define CEIL(x,y) (((x) + (y) - 1) / (y))

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#ifndef WIFSIGNALED
#define WIFSIGNALED(S) (((S) & 0xff) != 0 && ((S) & 0xff) != 0x7f)
#endif
#ifndef WTERMSIG
#define WTERMSIG(S) ((S) & 0x7f)
#endif
#ifndef WIFEXITED
#define WIFEXITED(S) (((S) & 0xff) == 0)
#endif
#ifndef WEXITSTATUS
#define WEXITSTATUS(S) (((S) & 0xff00) >> 8)
#endif
#ifndef WSTOPSIG
#define WSTOPSIG WEXITSTATUS
#endif

/* The HAVE_DECL_* macros are three-state, undefined, 0 or 1.  If they
   are defined to 0 then we must provide the relevant declaration
   here.  These checks will be in the undefined state while configure
   is running so be careful to test "defined (HAVE_DECL_*)".  */

#if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
extern double atof PARAMS ((const char *));
#endif

#if defined (HAVE_DECL_ATOL) && !HAVE_DECL_ATOL
extern long atol PARAMS ((const char *));
#endif

#if defined (HAVE_DECL_FREE) && !HAVE_DECL_FREE
extern void free PARAMS ((PTR));
#endif

#if defined (HAVE_DECL_GETCWD) && !HAVE_DECL_GETCWD
extern char *getcwd PARAMS ((char *, size_t));
#endif

#if defined (HAVE_DECL_GETENV) && !HAVE_DECL_GETENV
extern char *getenv PARAMS ((const char *));
#endif

#if defined (HAVE_DECL_GETOPT) && !HAVE_DECL_GETOPT
extern int getopt PARAMS ((int, char * const *, const char *));
#endif

#if defined (HAVE_DECL_GETWD) && !HAVE_DECL_GETWD
extern char *getwd PARAMS ((char *));
#endif

#if defined (HAVE_DECL_SBRK) && !HAVE_DECL_SBRK
extern PTR sbrk PARAMS ((int));
#endif

#if defined (HAVE_DECL_STRSTR) && !HAVE_DECL_STRSTR
extern char *strstr PARAMS ((const char *, const char *));
#endif

#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif

#if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC
extern PTR malloc PARAMS ((size_t));
#endif

#if defined (HAVE_DECL_CALLOC) && !HAVE_DECL_CALLOC
extern PTR calloc PARAMS ((size_t, size_t));
#endif

#if defined (HAVE_DECL_REALLOC) && !HAVE_DECL_REALLOC
extern PTR realloc PARAMS ((PTR, size_t));
#endif

/* If the system doesn't provide strsignal, we get it defined in
   libiberty but no declaration is supplied.  */
#ifndef HAVE_STRSIGNAL
# ifndef strsignal
extern const char *strsignal PARAMS ((int));
# endif
#endif

#ifdef HAVE_GETRLIMIT
# if defined (HAVE_DECL_GETRLIMIT) && !HAVE_DECL_GETRLIMIT
#  ifndef getrlimit
#   ifdef ANSI_PROTOTYPES
struct rlimit;
#   endif
extern int getrlimit PARAMS ((int, struct rlimit *));
#  endif
# endif
#endif

#ifdef HAVE_SETRLIMIT
# if defined (HAVE_DECL_SETRLIMIT) && !HAVE_DECL_SETRLIMIT
#  ifndef setrlimit
#   ifdef ANSI_PROTOTYPES
struct rlimit;
#   endif
extern int setrlimit PARAMS ((int, const struct rlimit *));
#  endif
# endif
#endif

/* HAVE_VOLATILE only refers to the stage1 compiler.  We also check
   __STDC__ and assume gcc sets it and has volatile in stage >=2.  */
#if !defined(HAVE_VOLATILE) && !defined(__STDC__) && !defined(volatile)
#define volatile
#endif

#if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
extern void abort PARAMS ((void));
#endif

/* 1 if we have C99 designated initializers.  */
#if !defined(HAVE_DESIGNATED_INITIALIZERS)
#define HAVE_DESIGNATED_INITIALIZERS \
  ((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L))
#endif

/* 1 if we have _Bool.  */
#ifndef HAVE__BOOL
# define HAVE__BOOL \
   ((GCC_VERSION >= 3000) || (__STDC_VERSION__ >= 199901L))
#endif


#if HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif

/* Test if something is a normal file.  */
#ifndef S_ISREG
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif

/* Test if something is a directory.  */
#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

/* Test if something is a character special file.  */
#ifndef S_ISCHR
#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
#endif

/* Test if something is a block special file.  */
#ifndef S_ISBLK
#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#endif

/* Test if something is a socket.  */
#ifndef S_ISSOCK
# ifdef S_IFSOCK
#   define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
# else
#   define S_ISSOCK(m) 0
# endif
#endif

/* Test if something is a FIFO.  */
#ifndef S_ISFIFO
# ifdef S_IFIFO
#  define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
# else
#  define S_ISFIFO(m) 0
# endif
#endif

/* Approximate O_NONBLOCK.  */
#ifndef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif

/* Approximate O_NOCTTY.  */
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif

/* Define well known filenos if the system does not define them.  */
#ifndef STDIN_FILENO
# define STDIN_FILENO   0
#endif
#ifndef STDOUT_FILENO
# define STDOUT_FILENO  1
#endif
#ifndef STDERR_FILENO
# define STDERR_FILENO  2
#endif

/* Some systems have mkdir that takes a single argument.  */
#ifdef MKDIR_TAKES_ONE_ARG
# define mkdir(a,b) mkdir(a)
#endif

/* Provide a way to print an address via printf.  */
#ifndef HOST_PTR_PRINTF
# ifdef HAVE_PRINTF_PTR
#  define HOST_PTR_PRINTF "%p"
# else
#  define HOST_PTR_PRINTF \
    (sizeof (int) == sizeof (char *) ? "%x" \
     : sizeof (long) == sizeof (char *) ? "%lx" : "%llx")
# endif
#endif /* ! HOST_PTR_PRINTF */

/* By default, colon separates directories in a path.  */
#ifndef PATH_SEPARATOR
#define PATH_SEPARATOR ':'
#endif

#ifndef DIR_SEPARATOR
#define DIR_SEPARATOR '/'
#endif

/* Define IS_DIR_SEPARATOR.  */
#ifndef DIR_SEPARATOR_2
# define IS_DIR_SEPARATOR(CH) ((CH) == DIR_SEPARATOR)
#else /* DIR_SEPARATOR_2 */
# define IS_DIR_SEPARATOR(CH) \
	(((CH) == DIR_SEPARATOR) || ((CH) == DIR_SEPARATOR_2))
#endif /* DIR_SEPARATOR_2 */

/* Say how to test for an absolute pathname.  On Unix systems, this is if
   it starts with a leading slash or a '$', the latter meaning the value of
   an environment variable is to be used.  On machien with DOS-based
   file systems, it is also absolute if it starts with a drive identifier.  */
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
#define IS_ABSOLUTE_PATHNAME(STR) \
  (IS_DIR_SEPARATOR ((STR)[0]) || (STR)[0] == '$' \
   || ((STR)[0] != '\0' && (STR)[1] == ':' && IS_DIR_SEPARATOR ((STR)[2])))
#else
#define IS_ABSOLUTE_PATHNAME(STR) \
  (IS_DIR_SEPARATOR ((STR)[0]) || (STR)[0] == '$')
#endif

/* Get libiberty declarations.  */
#include "libiberty.h"
#include "symcat.h"

/* Provide a default for the HOST_BIT_BUCKET.
   This suffices for POSIX-like hosts.  */

#ifndef HOST_BIT_BUCKET
#define HOST_BIT_BUCKET "/dev/null"
#endif

/* Be conservative and only use enum bitfields with GCC.
   FIXME: provide a complete autoconf test for buggy enum bitfields.  */

#if (GCC_VERSION > 2000)
#define ENUM_BITFIELD(TYPE) enum TYPE
#else
#define ENUM_BITFIELD(TYPE) unsigned int
#endif

#ifndef offsetof
#define offsetof(TYPE, MEMBER)	((size_t) &((TYPE *)0)->MEMBER)
#endif

/* Traditional C cannot initialize union members of structs.  Provide
   a macro which expands appropriately to handle it.  This only works
   if you intend to initialize the union member to zero since it relies
   on default initialization to zero in the traditional C case.  */
#ifdef __STDC__
#define UNION_INIT_ZERO , {0}
#else
#define UNION_INIT_ZERO
#endif

/* Various error reporting routines want to use __FUNCTION__.  */
#if (GCC_VERSION < 2007)
#ifndef __FUNCTION__
#define __FUNCTION__ "?"
#endif /* ! __FUNCTION__ */
#endif

/* __builtin_expect(A, B) evaluates to A, but notifies the compiler that
   the most likely value of A is B.  This feature was added at some point
   between 2.95 and 3.0.  Let's use 3.0 as the lower bound for now.  */
#if (GCC_VERSION < 3000)
#define __builtin_expect(a, b) (a)
#endif

/* Provide some sort of boolean type.  We use stdbool.h if it's
  available.  This must be after all inclusion of system headers,
  as some of them will mess us up.  */
#undef bool
#undef true
#undef false
#undef TRUE
#undef FALSE

#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# if !HAVE__BOOL
typedef char _Bool;
# endif
# define bool _Bool
# define true 1
# define false 0
#endif

#define TRUE true
#define FALSE false

/* As the last action in this file, we poison the identifiers that
   shouldn't be used.  Note, luckily gcc-3.0's token-based integrated
   preprocessor won't trip on poisoned identifiers that arrive from
   the expansion of macros.  E.g. #define strrchr rindex, won't error
   if rindex is poisoned after this directive is issued and later on
   strrchr is called.

   Note: We define bypass macros for the few cases where we really
   want to use the libc memory allocation routines.  Otherwise we
   insist you use the "x" versions from libiberty.  */

#define really_call_malloc malloc
#define really_call_calloc calloc
#define really_call_realloc realloc

#if (GCC_VERSION >= 3000)

/* Note autoconf checks for prototype declarations and includes
   system.h while doing so.  Only poison these tokens if actually
   compiling gcc, so that the autoconf declaration tests for malloc
   etc don't spuriously fail.  */
#ifdef IN_GCC
#undef malloc
#undef realloc
#undef calloc
#undef strdup
 #pragma GCC poison malloc realloc calloc strdup

/* Old target macros that have moved to the target hooks structure.  */
 #pragma GCC poison ASM_OPEN_PAREN ASM_CLOSE_PAREN			\
	FUNCTION_PROLOGUE FUNCTION_EPILOGUE				\
	FUNCTION_END_PROLOGUE FUNCTION_BEGIN_EPILOGUE			\
	DECL_MACHINE_ATTRIBUTES COMP_TYPE_ATTRIBUTES INSERT_ATTRIBUTES	\
	VALID_MACHINE_DECL_ATTRIBUTE VALID_MACHINE_TYPE_ATTRIBUTE	\
	SET_DEFAULT_TYPE_ATTRIBUTES SET_DEFAULT_DECL_ATTRIBUTES		\
	MERGE_MACHINE_TYPE_ATTRIBUTES MERGE_MACHINE_DECL_ATTRIBUTES	\
	MD_INIT_BUILTINS MD_EXPAND_BUILTIN ASM_OUTPUT_CONSTRUCTOR	\
	ASM_OUTPUT_DESTRUCTOR

/* And other obsolete target macros.  */
 #pragma GCC poison INT_ASM_OP

#endif /* IN_GCC */

/* Note: not all uses of the `index' token (e.g. variable names and
   structure members) have been eliminated.  */
#undef bcopy
#undef bzero
#undef bcmp
#undef rindex
 #pragma GCC poison bcopy bzero bcmp rindex

#endif /* GCC >= 3.0 */

#endif /* ! GCC_SYSTEM_H */