gcc/system.h

   1 /* Get common system includes and various definitions and declarations based
   2    on autoconf macros.
   3    Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #ifndef __GCC_SYSTEM_H__
  24 #define __GCC_SYSTEM_H__
  25
  26 /* This is the location of the online document giving information how
  27    to report bugs. If you change this string, also check for strings
  28    not under control of the preprocessor.  */
  29 #define GCCBUGURL "<URL:http://www.gnu.org/software/gcc/bugs.html>"
  30
  31 /* We must include stdarg.h/varargs.h before stdio.h. */
  32 #ifdef ANSI_PROTOTYPES
  33 #include <stdarg.h>
  34 #else
  35 #include <varargs.h>
  36 #endif
  37
  38 #ifndef va_copy
  39 # ifdef __va_copy
  40 #   define va_copy(d,s)  __va_copy((d),(s))
  41 # else
  42 #   define va_copy(d,s)  ((d) = (s))
  43 # endif
  44 #endif
  45
  46 #include <stdio.h>
  47
  48 /* Define a generic NULL if one hasn't already been defined.  */
  49 #ifndef NULL
  50 #define NULL 0
  51 #endif
  52
  53 /* The compiler is not a multi-threaded application and therefore we
  54    do not have to use the locking functions.
  55
  56    HAVE_DECL_PUTC_UNLOCKED actually indicates whether or not the IO
  57    code is multi-thread safe by default.  If it is set to 0, then do
  58    not worry about using the _unlocked functions.
  59
  60    fputs_unlocked is an extension and needs to be prototyped specially.  */
  61
  62 #if defined HAVE_PUTC_UNLOCKED && (defined (HAVE_DECL_PUTC_UNLOCKED) && HAVE_DECL_PUTC_UNLOCKED)
  63 # undef putc
  64 # define putc(C, Stream) putc_unlocked (C, Stream)
  65 #endif
  66 #if defined HAVE_FPUTC_UNLOCKED && (defined (HAVE_DECL_PUTC_UNLOCKED) && HAVE_DECL_PUTC_UNLOCKED)
  67 # undef fputc
  68 # define fputc(C, Stream) fputc_unlocked (C, Stream)
  69 #endif
  70 #if defined HAVE_FPUTS_UNLOCKED && (defined (HAVE_DECL_PUTC_UNLOCKED) && HAVE_DECL_PUTC_UNLOCKED)
  71 # undef fputs
  72 # define fputs(String, Stream) fputs_unlocked (String, Stream)
  73 # if defined (HAVE_DECL_FPUTS_UNLOCKED) && !HAVE_DECL_FPUTS_UNLOCKED
  74 extern int fputs_unlocked PARAMS ((const char *, FILE *));
  75 # endif
  76 #endif
  77
  78 #include <ctype.h>
  79
  80 /* Jim Meyering writes:
  81
  82    "... Some ctype macros are valid only for character codes that
  83    isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
  84    using /bin/cc or gcc but without giving an ansi option).  So, all
  85    ctype uses should be through macros like ISPRINT...  If
  86    STDC_HEADERS is defined, then autoconf has verified that the ctype
  87    macros don't need to be guarded with references to isascii. ...
  88    Defining isascii to 1 should let any compiler worth its salt
  89    eliminate the && through constant folding."
  90
  91    Bruno Haible adds:
  92
  93    "... Furthermore, isupper(c) etc. have an undefined result if c is
  94    outside the range -1 <= c <= 255. One is tempted to write isupper(c)
  95    with c being of type `char', but this is wrong if c is an 8-bit
  96    character >= 128 which gets sign-extended to a negative value.
  97    The macro ISUPPER protects against this as well."  */
  98
  99 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) || defined(HOST_EBCDIC)
 100 # define IN_CTYPE_DOMAIN(c) 1
 101 #else
 102 # define IN_CTYPE_DOMAIN(c) isascii(c)
 103 #endif
 104
 105 /* The ctype functions are often implemented as macros which do
 106    lookups in arrays using the parameter as the offset.  If the ctype
 107    function parameter is a char, then gcc will (appropriately) warn
 108    that a "subscript has type char".  Using a (signed) char as a subscript
 109    is bad because you may get negative offsets and thus it is not 8-bit
 110    safe.  The CTYPE_CONV macro ensures that the parameter is cast to an
 111    unsigned char when a char is passed in.  When an int is passed in, the
 112    parameter is left alone so we don't lose EOF.
 113 */
 114
 115 #define CTYPE_CONV(CH) \
 116   (sizeof(CH) == sizeof(unsigned char) ? (int)(unsigned char)(CH) : (int)(CH))
 117
 118
 119 /* WARNING!  The argument to the ctype replacement macros below is
 120    evaluated more than once so it must not have side effects!  */
 121
 122 #ifdef isblank
 123 # define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (CTYPE_CONV(c)))
 124 #else
 125 # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
 126 #endif
 127 #ifdef isgraph
 128 # define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (CTYPE_CONV(c)))
 129 #else
 130 # define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (CTYPE_CONV(c)) && !isspace (CTYPE_CONV(c)))
 131 #endif
 132
 133 #define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (CTYPE_CONV(c)))
 134 #define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (CTYPE_CONV(c)))
 135 #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (CTYPE_CONV(c)))
 136 #define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (CTYPE_CONV(c)))
 137 #define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (CTYPE_CONV(c)))
 138 #define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (CTYPE_CONV(c)))
 139 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (CTYPE_CONV(c)))
 140 #define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (CTYPE_CONV(c)))
 141 #define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (CTYPE_CONV(c)))
 142 #define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (CTYPE_CONV(c)))
 143
 144 #if STDC_HEADERS
 145 # define TOLOWER(c) (tolower (CTYPE_CONV(c)))
 146 # define TOUPPER(c) (toupper (CTYPE_CONV(c)))
 147 #else
 148 # define TOLOWER(c) (ISUPPER (c) ? tolower (CTYPE_CONV(c)) : (c))
 149 # define TOUPPER(c) (ISLOWER (c) ? toupper (CTYPE_CONV(c)) : (c))
 150 #endif
 151
 152 /* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
 153    - Its arg may be any int or unsigned int; it need not be an unsigned char.
 154    - It's guaranteed to evaluate its argument exactly once.
 155    - It's typically faster.
 156    Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
 157    only '0' through '9' are digits.  Prefer ISDIGIT to ISDIGIT_LOCALE unless
 158    it's important to use the locale's definition of `digit' even when the
 159    host does not conform to Posix.  */
 160 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
 161
 162 /* Define a default escape character; its different for EBCDIC.  */
 163 #ifndef TARGET_ESC
 164 #define TARGET_ESC 033
 165 #endif
 166
 167 #include <sys/types.h>
 168
 169 #include <errno.h>
 170
 171 #ifndef errno
 172 extern int errno;
 173 #endif
 174
 175 #ifdef STRING_WITH_STRINGS
 176 # include <string.h>
 177 # include <strings.h>
 178 #else
 179 # ifdef HAVE_STRING_H
 180 #  include <string.h>
 181 # else
 182 #  ifdef HAVE_STRINGS_H
 183 #   include <strings.h>
 184 #  endif
 185 # endif
 186 #endif
 187
 188 #ifdef HAVE_STDLIB_H
 189 # include <stdlib.h>
 190 # ifdef USE_C_ALLOCA
 191 /* Note that systems that use glibc have a <stdlib.h> that includes
 192    <alloca.h> that defines alloca, so let USE_C_ALLOCA override this. */
 193 # undef alloca
 194 #endif
 195 #endif
 196
 197 #ifdef HAVE_UNISTD_H
 198 # include <unistd.h>
 199 #endif
 200
 201 #ifdef HAVE_SYS_PARAM_H
 202 # include <sys/param.h>
 203 #endif
 204
 205 #if HAVE_LIMITS_H
 206 # include <limits.h>
 207 #endif
 208
 209 /* Find HOST_WIDEST_INT and set its bit size, type and print macros.
 210    It will be the largest integer mode supported by the host which may
 211    (or may not) be larger than HOST_WIDE_INT.  This must appear after
 212    <limits.h> since we only use `long long' if its bigger than a
 213    `long' and also if it is supported by macros in limits.h.  For old
 214    hosts which don't have a limits.h (and thus won't include it in
 215    stage2 cause we don't rerun configure) we assume gcc supports long
 216    long.)  Note, you won't get these defined if you don't include
 217    {ht}config.h before this file to set the HOST_BITS_PER_* macros. */
 218
 219 #ifndef HOST_WIDEST_INT
 220 # if defined (HOST_BITS_PER_LONG) && defined (HOST_BITS_PER_LONGLONG)
 221 #  if (HOST_BITS_PER_LONGLONG > HOST_BITS_PER_LONG) && (defined (LONG_LONG_MAX) || defined (LONGLONG_MAX) || defined (LLONG_MAX) || defined (__GNUC__))
 222 #   define HOST_BITS_PER_WIDEST_INT HOST_BITS_PER_LONGLONG
 223 #   define HOST_WIDEST_INT long long
 224 #   define HOST_WIDEST_INT_PRINT_DEC "%lld"
 225 #   define HOST_WIDEST_INT_PRINT_UNSIGNED "%llu"
 226 #   define HOST_WIDEST_INT_PRINT_HEX "0x%llx"
 227 #  else
 228 #   define HOST_BITS_PER_WIDEST_INT HOST_BITS_PER_LONG
 229 #   define HOST_WIDEST_INT long
 230 #   define HOST_WIDEST_INT_PRINT_DEC "%ld"
 231 #   define HOST_WIDEST_INT_PRINT_UNSIGNED "%lu"
 232 #   define HOST_WIDEST_INT_PRINT_HEX "0x%lx"
 233 #  endif /*(long long>long) && (LONG_LONG_MAX||LONGLONG_MAX||LLONG_MAX||GNUC)*/
 234 # endif /* defined(HOST_BITS_PER_LONG) && defined(HOST_BITS_PER_LONGLONG) */
 235 #endif /* ! HOST_WIDEST_INT */
 236
 237 /* Infrastructure for defining missing _MAX and _MIN macros.  Note that
 238    macros defined with these cannot be used in #if.  */
 239
 240 /* The extra casts work around common compiler bugs.  */
 241 #define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 242 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 243    It is necessary at least when t == time_t.  */
 244 #define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \
 245                              ? ~ (t) 0 << (sizeof(t) * CHAR_BIT - 1) : (t) 0))
 246 #define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t)))
 247
 248 /* Use that infrastructure to provide a few constants.  */
 249 #ifndef UCHAR_MAX
 250 # define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char)
 251 #endif
 252
 253 #ifdef TIME_WITH_SYS_TIME
 254 # include <sys/time.h>
 255 # include <time.h>
 256 #else
 257 # if HAVE_SYS_TIME_H
 258 #  include <sys/time.h>
 259 # else
 260 #  ifdef HAVE_TIME_H
 261 #   include <time.h>
 262 #  endif
 263 # endif
 264 #endif
 265
 266 #ifdef HAVE_FCNTL_H
 267 # include <fcntl.h>
 268 #else
 269 # ifdef HAVE_SYS_FILE_H
 270 #  include <sys/file.h>
 271 # endif
 272 #endif
 273
 274 #ifndef SEEK_SET
 275 # define SEEK_SET 0
 276 # define SEEK_CUR 1
 277 # define SEEK_END 2
 278 #endif
 279 #ifndef F_OK
 280 # define F_OK 0
 281 # define X_OK 1
 282 # define W_OK 2
 283 # define R_OK 4
 284 #endif
 285 #ifndef O_RDONLY
 286 # define O_RDONLY 0
 287 #endif
 288 #ifndef O_WRONLY
 289 # define O_WRONLY 1
 290 #endif
 291
 292 /* Some systems define these in, e.g., param.h.  We undefine these names
 293    here to avoid the warnings.  We prefer to use our definitions since we
 294    know they are correct.  */
 295
 296 #undef MIN
 297 #undef MAX
 298 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
 299 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
 300
 301 /* Returns the least number N such that N * Y >= X.  */
 302 #define CEIL(x,y) (((x) + (y) - 1) / (y))
 303
 304 #ifdef HAVE_SYS_WAIT_H
 305 #include <sys/wait.h>
 306 #endif
 307
 308 #ifndef WIFSIGNALED
 309 #define WIFSIGNALED(S) (((S) & 0xff) != 0 && ((S) & 0xff) != 0x7f)
 310 #endif
 311 #ifndef WTERMSIG
 312 #define WTERMSIG(S) ((S) & 0x7f)
 313 #endif
 314 #ifndef WIFEXITED
 315 #define WIFEXITED(S) (((S) & 0xff) == 0)
 316 #endif
 317 #ifndef WEXITSTATUS
 318 #define WEXITSTATUS(S) (((S) & 0xff00) >> 8)
 319 #endif
 320 #ifndef WSTOPSIG
 321 #define WSTOPSIG WEXITSTATUS
 322 #endif
 323
 324 /* The HAVE_DECL_* macros are three-state, undefined, 0 or 1.  If they
 325    are defined to 0 then we must provide the relevant declaration
 326    here.  These checks will be in the undefined state while configure
 327    is running so be careful to test "defined (HAVE_DECL_*)".  */
 328
 329 #ifndef bcopy
 330 # ifdef HAVE_BCOPY
 331 #  if defined (HAVE_DECL_BCOPY) && !HAVE_DECL_BCOPY
 332 extern void bcopy PARAMS ((const PTR, PTR, size_t));
 333 #  endif
 334 # else /* ! HAVE_BCOPY */
 335 #  define bcopy(src,dst,len) memmove((dst),(src),(len))
 336 # endif
 337 #endif
 338
 339 #if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
 340 extern double atof PARAMS ((const char *));
 341 #endif
 342
 343 #if defined (HAVE_DECL_ATOL) && !HAVE_DECL_ATOL
 344 extern long atol PARAMS ((const char *));
 345 #endif
 346
 347 #if defined (HAVE_DECL_FREE) && !HAVE_DECL_FREE
 348 extern void free PARAMS ((PTR));
 349 #endif
 350
 351 #if defined (HAVE_DECL_GETCWD) && !HAVE_DECL_GETCWD
 352 extern char *getcwd PARAMS ((char *, size_t));
 353 #endif
 354
 355 #if defined (HAVE_DECL_GETENV) && !HAVE_DECL_GETENV
 356 extern char *getenv PARAMS ((const char *));
 357 #endif
 358
 359 #if defined (HAVE_DECL_GETOPT) && !HAVE_DECL_GETOPT
 360 extern int getopt PARAMS ((int, char **, char *));
 361 #endif
 362
 363 #if defined (HAVE_DECL_GETWD) && !HAVE_DECL_GETWD
 364 extern char *getwd PARAMS ((char *));
 365 #endif
 366
 367 #if defined (HAVE_DECL_SBRK) && !HAVE_DECL_SBRK
 368 extern PTR sbrk PARAMS ((int));
 369 #endif
 370
 371 #if defined (HAVE_DECL_STRSTR) && !HAVE_DECL_STRSTR
 372 extern char *strstr PARAMS ((const char *, const char *));
 373 #endif
 374
 375 #ifdef HAVE_MALLOC_H
 376 #include <malloc.h>
 377 #endif
 378
 379 #if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC
 380 extern PTR malloc PARAMS ((size_t));
 381 #endif
 382
 383 #if defined (HAVE_DECL_CALLOC) && !HAVE_DECL_CALLOC
 384 extern PTR calloc PARAMS ((size_t, size_t));
 385 #endif
 386
 387 #if defined (HAVE_DECL_REALLOC) && !HAVE_DECL_REALLOC
 388 extern PTR realloc PARAMS ((PTR, size_t));
 389 #endif
 390
 391 /* If the system doesn't provide strsignal, we get it defined in
 392    libiberty but no declaration is supplied. */
 393 #ifndef HAVE_STRSIGNAL
 394 # ifndef strsignal
 395 extern const char *strsignal PARAMS ((int));
 396 # endif
 397 #endif
 398
 399 #ifdef HAVE_GETRLIMIT
 400 # if defined (HAVE_DECL_GETRLIMIT) && !HAVE_DECL_GETRLIMIT
 401 #  ifndef getrlimit
 402 #   ifdef ANSI_PROTOTYPES
 403 struct rlimit;
 404 #   endif
 405 extern int getrlimit PARAMS ((int, struct rlimit *));
 406 #  endif
 407 # endif
 408 #endif
 409
 410 #ifdef HAVE_SETRLIMIT
 411 # if defined (HAVE_DECL_SETRLIMIT) && !HAVE_DECL_SETRLIMIT
 412 #  ifndef setrlimit
 413 #   ifdef ANSI_PROTOTYPES
 414 struct rlimit;
 415 #   endif
 416 extern int setrlimit PARAMS ((int, const struct rlimit *));
 417 #  endif
 418 # endif
 419 #endif
 420
 421 /* HAVE_VOLATILE only refers to the stage1 compiler.  We also check
 422    __STDC__ and assume gcc sets it and has volatile in stage >=2. */
 423 #if !defined(HAVE_VOLATILE) && !defined(__STDC__) && !defined(volatile)
 424 #define volatile
 425 #endif
 426
 427 #if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
 428 extern void abort PARAMS ((void));
 429 #endif
 430
 431 /* 1 if we have C99 designated initializers.  */
 432 #if !defined(HAVE_DESIGNATED_INITIALIZERS)
 433 #define HAVE_DESIGNATED_INITIALIZERS \
 434   ((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L))
 435 #endif
 436
 437 /* Define a STRINGIFY macro that's right for ANSI or traditional C.
 438    Note: if the argument passed to STRINGIFY is itself a macro, eg
 439    #define foo bar, STRINGIFY(foo) will produce "foo", not "bar".
 440    Although the __STDC__ case could be made to expand this via a layer
 441    of indirection, the traditional C case can not do so.  Therefore
 442    this behavior is not supported. */
 443 #ifndef STRINGIFY
 444 # ifdef HAVE_STRINGIZE
 445 #  define STRINGIFY(STRING) #STRING
 446 # else
 447 #  define STRINGIFY(STRING) "STRING"
 448 # endif
 449 #endif /* ! STRINGIFY */
 450
 451 #if HAVE_SYS_STAT_H
 452 # include <sys/stat.h>
 453 #endif
 454
 455 /* Test if something is a normal file.  */
 456 #ifndef S_ISREG
 457 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 458 #endif
 459
 460 /* Test if something is a directory.  */
 461 #ifndef S_ISDIR
 462 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 463 #endif
 464
 465 /* Test if something is a character special file.  */
 466 #ifndef S_ISCHR
 467 #define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
 468 #endif
 469
 470 /* Test if something is a block special file.  */
 471 #ifndef S_ISBLK
 472 #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
 473 #endif
 474
 475 /* Test if something is a socket.  */
 476 #ifndef S_ISSOCK
 477 # ifdef S_IFSOCK
 478 #   define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
 479 # else
 480 #   define S_ISSOCK(m) 0
 481 # endif
 482 #endif
 483
 484 /* Test if something is a FIFO.  */
 485 #ifndef S_ISFIFO
 486 # ifdef S_IFIFO
 487 #  define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
 488 # else
 489 #  define S_ISFIFO(m) 0
 490 # endif
 491 #endif
 492
 493 /* Approximate O_NONBLOCK.  */
 494 #ifndef O_NONBLOCK
 495 #define O_NONBLOCK O_NDELAY
 496 #endif
 497
 498 /* Approximate O_NOCTTY.  */
 499 #ifndef O_NOCTTY
 500 #define O_NOCTTY 0
 501 #endif
 502
 503 /* Define well known filenos if the system does not define them.  */
 504 #ifndef STDIN_FILENO
 505 # define STDIN_FILENO   0
 506 #endif
 507 #ifndef STDOUT_FILENO
 508 # define STDOUT_FILENO  1
 509 #endif
 510 #ifndef STDERR_FILENO
 511 # define STDERR_FILENO  2
 512 #endif
 513
 514 /* Some systems have mkdir that takes a single argument. */
 515 #ifdef MKDIR_TAKES_ONE_ARG
 516 # define mkdir(a,b) mkdir(a)
 517 #endif
 518
 519 /* Provide a way to print an address via printf.  */
 520 #ifndef HOST_PTR_PRINTF
 521 # ifdef HAVE_PRINTF_PTR
 522 #  define HOST_PTR_PRINTF "%p"
 523 # else
 524 #  define HOST_PTR_PRINTF \
 525     (sizeof (int) == sizeof (char *) ? "%x" \
 526      : sizeof (long) == sizeof (char *) ? "%lx" : "%llx")
 527 # endif
 528 #endif /* ! HOST_PTR_PRINTF */
 529
 530 /* By default, colon separates directories in a path.  */
 531 #ifndef PATH_SEPARATOR
 532 #define PATH_SEPARATOR ':'
 533 #endif
 534
 535 #ifndef DIR_SEPARATOR
 536 #define DIR_SEPARATOR '/'
 537 #endif
 538
 539 /* Define IS_DIR_SEPARATOR.  */
 540 #ifndef DIR_SEPARATOR_2
 541 # define IS_DIR_SEPARATOR(CH) ((CH) == DIR_SEPARATOR)
 542 #else /* DIR_SEPARATOR_2 */
 543 # define IS_DIR_SEPARATOR(CH) \
 544         (((CH) == DIR_SEPARATOR) || ((CH) == DIR_SEPARATOR_2))
 545 #endif /* DIR_SEPARATOR_2 */
 546
 547 /* Say how to test for an absolute pathname.  On Unix systems, this is if
 548    it starts with a leading slash or a '$', the latter meaning the value of
 549    an environment variable is to be used.  On machien with DOS-based
 550    file systems, it is also absolute if it starts with a drive identifier.  */
 551 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 552 #define IS_ABSOLUTE_PATHNAME(STR) \
 553   (IS_DIR_SEPARATOR ((STR)[0]) || (STR)[0] == '$' \
 554    || ((STR)[0] != '\0' && (STR)[1] == ':' && IS_DIR_SEPARATOR ((STR)[2])))
 555 #else
 556 #define IS_ABSOLUTE_PATHNAME(STR) \
 557   (IS_DIR_SEPARATOR ((STR)[0]) || (STR)[0] == '$')
 558 #endif
 559
 560 /* Get libiberty declarations. */
 561 #include "libiberty.h"
 562
 563 /* Make sure that ONLY_INT_FIELDS has an integral value.  */
 564 #ifdef ONLY_INT_FIELDS
 565 #undef ONLY_INT_FIELDS
 566 #define ONLY_INT_FIELDS 1
 567 #else
 568 #define ONLY_INT_FIELDS 0
 569 #endif
 570
 571 /* Provide a default for the HOST_BIT_BUCKET.
 572    This suffices for POSIX-like hosts.  */
 573
 574 #ifndef HOST_BIT_BUCKET
 575 #define HOST_BIT_BUCKET "/dev/null"
 576 #endif
 577
 578 /* Enumerated bitfields are safe to use unless we've been explictly told
 579    otherwise or if they are signed. */
 580
 581 #define USE_ENUM_BITFIELDS (__GNUC__ || (!ONLY_INT_FIELDS && ENUM_BITFIELDS_ARE_UNSIGNED))
 582
 583 #if USE_ENUM_BITFIELDS
 584 #define ENUM_BITFIELD(TYPE) enum TYPE
 585 #else
 586 #define ENUM_BITFIELD(TYPE) unsigned int
 587 #endif
 588
 589 #ifndef offsetof
 590 #define offsetof(TYPE, MEMBER)  ((size_t) &((TYPE *)0)->MEMBER)
 591 #endif
 592
 593 /* Traditional C cannot initialize union members of structs.  Provide
 594    a macro which expands appropriately to handle it.  This only works
 595    if you intend to initalize the union member to zero since it relies
 596    on default initialization to zero in the traditional C case.  */
 597 #ifdef __STDC__
 598 #define UNION_INIT_ZERO , {0}
 599 #else
 600 #define UNION_INIT_ZERO
 601 #endif
 602
 603 /* GCC now gives implicit declaration warnings for undeclared builtins.  */
 604 #if defined(__GNUC__) && defined (__SIZE_TYPE__)
 605 extern void *alloca (__SIZE_TYPE__);
 606 #endif
 607
 608 /* Various error reporting routines want to use __FUNCTION__.  */
 609 #if (GCC_VERSION < 2007)
 610 #ifndef __FUNCTION__
 611 #define __FUNCTION__ "?"
 612 #endif /* ! __FUNCTION__ */
 613 #endif
 614
 615 #endif /* __GCC_SYSTEM_H__ */