-/* system.h - Get common system includes and various definitions and
- declarations based on autoconf macros.
- Copyright (C) 1998 Free Software Foundation, Inc.
+/* Get common system includes and various definitions and declarations based
+ on autoconf macros.
+ Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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.
+
+GNU CC 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 GNU CC; 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>
#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
+
#include <stdio.h>
/* Define a generic NULL if one hasn't already been defined. */
#endif
/* The compiler is not a multi-threaded application and therefore we
- do not have to use the locking functions. */
-#ifdef HAVE_PUTC_UNLOCKED
+ do not have to use the locking functions.
+
+ HAVE_DECL_PUTC_UNLOCKED actually indicates whether or not the IO
+ code is multi-thread safe by default. If it is set to 0, then do
+ not worry about using the _unlocked functions.
+
+ fputs_unlocked is an extension and needs to be prototyped specially. */
+
+#if defined HAVE_PUTC_UNLOCKED && (defined (HAVE_DECL_PUTC_UNLOCKED) && HAVE_DECL_PUTC_UNLOCKED)
# undef putc
# define putc(C, Stream) putc_unlocked (C, Stream)
#endif
-#ifdef HAVE_FPUTC_UNLOCKED
+#if defined HAVE_FPUTC_UNLOCKED && (defined (HAVE_DECL_PUTC_UNLOCKED) && HAVE_DECL_PUTC_UNLOCKED)
# undef fputc
# define fputc(C, Stream) fputc_unlocked (C, Stream)
#endif
-#ifdef HAVE_FPUTS_UNLOCKED
+#if defined HAVE_FPUTS_UNLOCKED && (defined (HAVE_DECL_PUTC_UNLOCKED) && HAVE_DECL_PUTC_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
#include <ctype.h>
character >= 128 which gets sign-extended to a negative value.
The macro ISUPPER protects against this as well." */
-#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
+#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) || defined(HOST_EBCDIC)
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
+/* The ctype functions are often implemented as macros which do
+ lookups in arrays using the parameter as the offset. If the ctype
+ function parameter is a char, then gcc will (appropriately) warn
+ that a "subscript has type char". Using a (signed) char as a subscript
+ is bad because you may get negative offsets and thus it is not 8-bit
+ safe. The CTYPE_CONV macro ensures that the parameter is cast to an
+ unsigned char when a char is passed in. When an int is passed in, the
+ parameter is left alone so we don't lose EOF.
+*/
+
+#define CTYPE_CONV(CH) \
+ (sizeof(CH) == sizeof(unsigned char) ? (int)(unsigned char)(CH) : (int)(CH))
+
+
+/* WARNING! The argument to the ctype replacement macros below is
+ evaluated more than once so it must not have side effects! */
+
#ifdef isblank
-# define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))
+# define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (CTYPE_CONV(c)))
#else
# define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#endif
#ifdef isgraph
-# define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))
+# define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (CTYPE_CONV(c)))
#else
-# define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (c) && !isspace (c))
+# define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (CTYPE_CONV(c)) && !isspace (CTYPE_CONV(c)))
+#endif
+
+#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (CTYPE_CONV(c)))
+#define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (CTYPE_CONV(c)))
+#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (CTYPE_CONV(c)))
+#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (CTYPE_CONV(c)))
+#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (CTYPE_CONV(c)))
+#define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (CTYPE_CONV(c)))
+#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (CTYPE_CONV(c)))
+#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (CTYPE_CONV(c)))
+#define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (CTYPE_CONV(c)))
+#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (CTYPE_CONV(c)))
+
+#if STDC_HEADERS
+# define TOLOWER(c) (tolower (CTYPE_CONV(c)))
+# define TOUPPER(c) (toupper (CTYPE_CONV(c)))
+#else
+# define TOLOWER(c) (ISUPPER (c) ? tolower (CTYPE_CONV(c)) : (c))
+# define TOUPPER(c) (ISLOWER (c) ? toupper (CTYPE_CONV(c)) : (c))
#endif
-#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
-#define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c))
-#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
-#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
-#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
-#define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (c))
-#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
-#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
-#define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))
-#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
-
/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
- Its arg may be any int or unsigned int; it need not be an unsigned char.
- It's guaranteed to evaluate its argument exactly once.
host does not conform to Posix. */
#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
+/* Define a default escape character; its different for EBCDIC. */
+#ifndef TARGET_ESC
+#define TARGET_ESC 033
+#endif
#include <sys/types.h>
+
#include <errno.h>
#ifndef errno
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
+# ifdef USE_C_ALLOCA
+/* Note that systems that use glibc have a <stdlib.h> that includes
+ <alloca.h> that defines alloca, so let USE_C_ALLOCA override this. */
+# undef alloca
+#endif
#endif
#ifdef HAVE_UNISTD_H
# include <limits.h>
#endif
+/* Find HOST_WIDEST_INT and set its bit size, type and print macros.
+ It will be the largest integer mode supported by the host which may
+ (or may not) be larger than HOST_WIDE_INT. This must appear after
+ <limits.h> since we only use `long long' if its bigger than a
+ `long' and also if it is supported by macros in limits.h. For old
+ hosts which don't have a limits.h (and thus won't include it in
+ stage2 cause we don't rerun configure) we assume gcc supports long
+ long.) Note, you won't get these defined if you don't include
+ {ht}config.h before this file to set the HOST_BITS_PER_* macros. */
+
+#ifndef HOST_WIDEST_INT
+# if defined (HOST_BITS_PER_LONG) && defined (HOST_BITS_PER_LONGLONG)
+# if (HOST_BITS_PER_LONGLONG > HOST_BITS_PER_LONG) && (defined (LONG_LONG_MAX) || defined (LONGLONG_MAX) || defined (LLONG_MAX) || defined (__GNUC__))
+# define HOST_BITS_PER_WIDEST_INT HOST_BITS_PER_LONGLONG
+# define HOST_WIDEST_INT long long
+# define HOST_WIDEST_INT_PRINT_DEC "%lld"
+# define HOST_WIDEST_INT_PRINT_UNSIGNED "%llu"
+# define HOST_WIDEST_INT_PRINT_HEX "0x%llx"
+# else
+# define HOST_BITS_PER_WIDEST_INT HOST_BITS_PER_LONG
+# define HOST_WIDEST_INT long
+# define HOST_WIDEST_INT_PRINT_DEC "%ld"
+# define HOST_WIDEST_INT_PRINT_UNSIGNED "%lu"
+# define HOST_WIDEST_INT_PRINT_HEX "0x%lx"
+# endif /*(long long>long) && (LONG_LONG_MAX||LONGLONG_MAX||LLONG_MAX||GNUC)*/
+# endif /* defined(HOST_BITS_PER_LONG) && defined(HOST_BITS_PER_LONGLONG) */
+#endif /* ! HOST_WIDEST_INT */
+
+/* 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>
#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 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_*)". */
#ifndef bcopy
# ifdef HAVE_BCOPY
-# ifdef NEED_DECLARATION_BCOPY
-extern void bcopy ();
+# if defined (HAVE_DECL_BCOPY) && !HAVE_DECL_BCOPY
+extern void bcopy PARAMS ((const PTR, PTR, size_t));
# endif
# else /* ! HAVE_BCOPY */
-# define bcopy(src,dst,len) memcpy ((dst),(src),(len))
+# define bcopy(src,dst,len) memmove((dst),(src),(len))
# endif
#endif
#ifndef bcmp
# ifdef HAVE_BCMP
-# ifdef NEED_DECLARATION_BCMP
-extern int bcmp ();
+# if defined (HAVE_DECL_BCMP) && !HAVE_DECL_BCMP
+extern int bcmp PARAMS ((const PTR, const PTR, size_t));
# endif
# else /* ! HAVE_BCMP */
# define bcmp(left,right,len) memcmp ((left),(right),(len))
#ifndef bzero
# ifdef HAVE_BZERO
-# ifdef NEED_DECLARATION_BZERO
-extern void bzero ();
+# if defined (HAVE_DECL_BZERO) && !HAVE_DECL_BZERO
+extern void bzero PARAMS ((PTR, size_t));
# endif
# else /* ! HAVE_BZERO */
# define bzero(dst,len) memset ((dst),0,(len))
#ifndef index
# ifdef HAVE_INDEX
-# ifdef NEED_DECLARATION_INDEX
-extern char *index ();
+# if defined (HAVE_DECL_INDEX) && !HAVE_DECL_INDEX
+extern char *index PARAMS ((const char *, int));
# endif
# else /* ! HAVE_INDEX */
# define index strchr
#ifndef rindex
# ifdef HAVE_RINDEX
-# ifdef NEED_DECLARATION_RINDEX
-extern char *rindex ();
+# if defined (HAVE_DECL_RINDEX) && !HAVE_DECL_RINDEX
+extern char *rindex PARAMS ((const char *, int));
# endif
# else /* ! HAVE_RINDEX */
# define rindex strrchr
# endif
#endif
-#ifdef NEED_DECLARATION_ATOF
-extern double atof ();
+#if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
+extern double atof PARAMS ((const char *));
#endif
-#ifdef NEED_DECLARATION_ATOL
-extern long atol();
+#if defined (HAVE_DECL_ATOL) && !HAVE_DECL_ATOL
+extern long atol PARAMS ((const char *));
#endif
-#ifdef NEED_DECLARATION_FREE
-extern void free ();
+#if defined (HAVE_DECL_FREE) && !HAVE_DECL_FREE
+extern void free PARAMS ((PTR));
#endif
-#ifdef NEED_DECLARATION_GETCWD
-extern char *getcwd ();
+#if defined (HAVE_DECL_GETCWD) && !HAVE_DECL_GETCWD
+extern char *getcwd PARAMS ((char *, size_t));
#endif
-#ifdef NEED_DECLARATION_GETENV
-extern char *getenv ();
+#if defined (HAVE_DECL_GETENV) && !HAVE_DECL_GETENV
+extern char *getenv PARAMS ((const char *));
#endif
-#ifdef NEED_DECLARATION_GETWD
-extern char *getwd ();
+#if defined (HAVE_DECL_GETWD) && !HAVE_DECL_GETWD
+extern char *getwd PARAMS ((char *));
#endif
-#ifdef NEED_DECLARATION_SBRK
-extern char *sbrk ();
+#if defined (HAVE_DECL_SBRK) && !HAVE_DECL_SBRK
+extern PTR sbrk PARAMS ((int));
#endif
-#ifdef HAVE_STRERROR
-# ifdef NEED_DECLARATION_STRERROR
-# ifndef strerror
-extern char *strerror ();
-# endif
-# endif
-#else /* ! HAVE_STRERROR */
-extern int sys_nerr;
-extern char *sys_errlist[];
-#endif /* HAVE_STRERROR */
-
-#ifdef HAVE_STRSIGNAL
-# ifdef NEED_DECLARATION_STRSIGNAL
-# ifndef strsignal
-extern char * strsignal ();
-# endif
-# endif
-#else /* ! HAVE_STRSIGNAL */
-# ifndef SYS_SIGLIST_DECLARED
-# ifndef NO_SYS_SIGLIST
-extern char * sys_siglist[];
-# 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. */
+#if defined (HAVE_DECL_STRSIGNAL) && !HAVE_DECL_STRSIGNAL
+# ifndef strsignal
+extern const char *strsignal PARAMS ((int));
# endif
-#endif /* HAVE_STRSIGNAL */
+#endif
#ifdef HAVE_GETRLIMIT
-# ifdef NEED_DECLARATION_GETRLIMIT
+# if defined (HAVE_DECL_GETRLIMIT) && !HAVE_DECL_GETRLIMIT
# ifndef getrlimit
-extern int getrlimit ();
+# ifdef ANSI_PROTOTYPES
+struct rlimit;
+# endif
+extern int getrlimit PARAMS ((int, struct rlimit *));
# endif
# endif
#endif
#ifdef HAVE_SETRLIMIT
-# ifdef NEED_DECLARATION_SETRLIMIT
+# if defined (HAVE_DECL_SETRLIMIT) && !HAVE_DECL_SETRLIMIT
# ifndef setrlimit
-extern int setrlimit ();
+# ifdef ANSI_PROTOTYPES
+struct rlimit;
+# endif
+extern int setrlimit PARAMS ((int, const struct rlimit *));
# endif
# endif
#endif
#define volatile
#endif
-/* Redefine abort to report an internal error w/o coredump, and reporting the
- location of the error in the source file. */
-#ifndef abort
-#ifndef __STDC__
-#ifndef __GNUC__
-#ifndef USE_SYSTEM_ABORT
-#define USE_SYSTEM_ABORT
-#endif /* !USE_SYSTEM_ABORT */
-#endif /* !__GNUC__ */
-#endif /* !__STDC__ */
-
-#ifdef USE_SYSTEM_ABORT
-# ifdef NEED_DECLARATION_ABORT
-extern void abort ();
-# endif
-#else
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
-#define abort() \
-(fprintf (stderr, \
- "%s:%d: Internal compiler error\n", __FILE__, __LINE__), \
- exit (FATAL_EXIT_CODE))
-
-#else
-#define abort() \
-(fprintf (stderr, \
- "%s:%d: Internal compiler error in function %s\n", \
- __FILE__, __LINE__, __PRETTY_FUNCTION__), \
- exit (FATAL_EXIT_CODE))
-
-#endif /* recent gcc */
-#endif /* USE_SYSTEM_ABORT */
-#endif /* !abort */
-
+#if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
+extern void abort PARAMS ((void));
+#endif
/* Define a STRINGIFY macro that's right for ANSI or traditional C.
- HAVE_CPP_STRINGIFY only refers to the stage1 compiler. Assume that
- (non-traditional) gcc used in stage2 or later has this feature.
-
Note: if the argument passed to STRINGIFY is itself a macro, eg
#define foo bar, STRINGIFY(foo) will produce "foo", not "bar".
Although the __STDC__ case could be made to expand this via a layer
of indirection, the traditional C case can not do so. Therefore
this behavior is not supported. */
#ifndef STRINGIFY
-# if defined(HAVE_CPP_STRINGIFY) || (defined(__GNUC__) && defined(__STDC__))
+# ifdef HAVE_STRINGIZE
# define STRINGIFY(STRING) #STRING
# else
# define STRINGIFY(STRING) "STRING"
# endif
#endif /* ! STRINGIFY */
-
-/* These macros are here in preparation for the use of gettext in egcs. */
-#define _(String) String
-#define N_(String) String
-
#if HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#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 */
+
/* Get libiberty declarations. */
#include "libiberty.h"
+/* Make sure that ONLY_INT_FIELDS has an integral value. */
+#ifdef ONLY_INT_FIELDS
+#undef ONLY_INT_FIELDS
+#define ONLY_INT_FIELDS 1
+#else
+#define ONLY_INT_FIELDS 0
+#endif
+
+/* Enumerated bitfields are safe to use unless we've been explictly told
+ otherwise or if they are signed. */
+
+#define USE_ENUM_BITFIELDS (__GNUC__ || (!ONLY_INT_FIELDS && ENUM_BITFIELDS_ARE_UNSIGNED))
+
+#if USE_ENUM_BITFIELDS
+#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 initalize 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
+
+/* GCC now gives implicit declaration warnings for undeclared builtins. */
+#if defined(__GNUC__) && defined (__SIZE_TYPE__)
+extern void *alloca (__SIZE_TYPE__);
+#endif
+
+/* Various error reporting routines want to use __FUNCTION__. */
+#if (GCC_VERSION < 2007)
+#ifndef __FUNCTION__
+#define __FUNCTION__ "?"
+#endif /* ! __FUNCTION__ */
+#endif
+
#endif /* __GCC_SYSTEM_H__ */
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