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 /* There are an extraordinary number of issues with <ctype.h>.
  79    The last straw is that it varies with the locale.  Use libiberty's
  80    replacement instead.  */
  81 #include <safe-ctype.h>
  82
  83 /* Define a default escape character; it's different for EBCDIC.  */
  84 #ifndef TARGET_ESC
  85 #define TARGET_ESC 033
  86 #endif
  87
  88 #include <sys/types.h>
  89
  90 #include <errno.h>
  91
  92 #ifndef errno
  93 extern int errno;
  94 #endif
  95
  96 #ifdef STRING_WITH_STRINGS
  97 # include <string.h>
  98 # include <strings.h>
  99 #else
 100 # ifdef HAVE_STRING_H
 101 #  include <string.h>
 102 # else
 103 #  ifdef HAVE_STRINGS_H
 104 #   include <strings.h>
 105 #  endif
 106 # endif
 107 #endif
 108
 109 #ifdef HAVE_STDLIB_H
 110 # include <stdlib.h>
 111 # ifdef USE_C_ALLOCA
 112 /* Note that systems that use glibc have a <stdlib.h> that includes
 113    <alloca.h> that defines alloca, so let USE_C_ALLOCA override this. */
 114 # undef alloca
 115 #endif
 116 #endif
 117
 118 #ifdef HAVE_UNISTD_H
 119 # include <unistd.h>
 120 #endif
 121
 122 #ifdef HAVE_SYS_PARAM_H
 123 # include <sys/param.h>
 124 #endif
 125
 126 #if HAVE_LIMITS_H
 127 # include <limits.h>
 128 #endif
 129
 130 /* Find HOST_WIDEST_INT and set its bit size, type and print macros.
 131    It will be the largest integer mode supported by the host which may
 132    (or may not) be larger than HOST_WIDE_INT.  This must appear after
 133    <limits.h> since we only use `long long' if its bigger than a
 134    `long' and also if it is supported by macros in limits.h.  For old
 135    hosts which don't have a limits.h (and thus won't include it in
 136    stage2 cause we don't rerun configure) we assume gcc supports long
 137    long.)  Note, you won't get these defined if you don't include
 138    {ht}config.h before this file to set the HOST_BITS_PER_* macros. */
 139
 140 #ifndef HOST_WIDEST_INT
 141 # if defined (HOST_BITS_PER_LONG) && defined (HOST_BITS_PER_LONGLONG)
 142 #  if (HOST_BITS_PER_LONGLONG > HOST_BITS_PER_LONG) && (defined (LONG_LONG_MAX) || defined (LONGLONG_MAX) || defined (LLONG_MAX) || defined (__GNUC__))
 143 #   define HOST_BITS_PER_WIDEST_INT HOST_BITS_PER_LONGLONG
 144 #   define HOST_WIDEST_INT long long
 145 #   define HOST_WIDEST_INT_PRINT_DEC "%lld"
 146 #   define HOST_WIDEST_INT_PRINT_UNSIGNED "%llu"
 147 #   define HOST_WIDEST_INT_PRINT_HEX "0x%llx"
 148 #  else
 149 #   define HOST_BITS_PER_WIDEST_INT HOST_BITS_PER_LONG
 150 #   define HOST_WIDEST_INT long
 151 #   define HOST_WIDEST_INT_PRINT_DEC "%ld"
 152 #   define HOST_WIDEST_INT_PRINT_UNSIGNED "%lu"
 153 #   define HOST_WIDEST_INT_PRINT_HEX "0x%lx"
 154 #  endif /*(long long>long) && (LONG_LONG_MAX||LONGLONG_MAX||LLONG_MAX||GNUC)*/
 155 # endif /* defined(HOST_BITS_PER_LONG) && defined(HOST_BITS_PER_LONGLONG) */
 156 #endif /* ! HOST_WIDEST_INT */
 157
 158 /* Infrastructure for defining missing _MAX and _MIN macros.  Note that
 159    macros defined with these cannot be used in #if.  */
 160
 161 /* The extra casts work around common compiler bugs.  */
 162 #define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 163 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 164    It is necessary at least when t == time_t.  */
 165 #define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \
 166                              ? ~ (t) 0 << (sizeof(t) * CHAR_BIT - 1) : (t) 0))
 167 #define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t)))
 168
 169 /* Use that infrastructure to provide a few constants.  */
 170 #ifndef UCHAR_MAX
 171 # define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char)
 172 #endif
 173
 174 #ifdef TIME_WITH_SYS_TIME
 175 # include <sys/time.h>
 176 # include <time.h>
 177 #else
 178 # if HAVE_SYS_TIME_H
 179 #  include <sys/time.h>
 180 # else
 181 #  ifdef HAVE_TIME_H
 182 #   include <time.h>
 183 #  endif
 184 # endif
 185 #endif
 186
 187 #ifdef HAVE_FCNTL_H
 188 # include <fcntl.h>
 189 #else
 190 # ifdef HAVE_SYS_FILE_H
 191 #  include <sys/file.h>
 192 # endif
 193 #endif
 194
 195 #ifndef SEEK_SET
 196 # define SEEK_SET 0
 197 # define SEEK_CUR 1
 198 # define SEEK_END 2
 199 #endif
 200 #ifndef F_OK
 201 # define F_OK 0
 202 # define X_OK 1
 203 # define W_OK 2
 204 # define R_OK 4
 205 #endif
 206 #ifndef O_RDONLY
 207 # define O_RDONLY 0
 208 #endif
 209 #ifndef O_WRONLY
 210 # define O_WRONLY 1
 211 #endif
 212
 213 /* Some systems define these in, e.g., param.h.  We undefine these names
 214    here to avoid the warnings.  We prefer to use our definitions since we
 215    know they are correct.  */
 216
 217 #undef MIN
 218 #undef MAX
 219 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
 220 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
 221
 222 /* Returns the least number N such that N * Y >= X.  */
 223 #define CEIL(x,y) (((x) + (y) - 1) / (y))
 224
 225 #ifdef HAVE_SYS_WAIT_H
 226 #include <sys/wait.h>
 227 #endif
 228
 229 #ifndef WIFSIGNALED
 230 #define WIFSIGNALED(S) (((S) & 0xff) != 0 && ((S) & 0xff) != 0x7f)
 231 #endif
 232 #ifndef WTERMSIG
 233 #define WTERMSIG(S) ((S) & 0x7f)
 234 #endif
 235 #ifndef WIFEXITED
 236 #define WIFEXITED(S) (((S) & 0xff) == 0)
 237 #endif
 238 #ifndef WEXITSTATUS
 239 #define WEXITSTATUS(S) (((S) & 0xff00) >> 8)
 240 #endif
 241 #ifndef WSTOPSIG
 242 #define WSTOPSIG WEXITSTATUS
 243 #endif
 244
 245 /* The HAVE_DECL_* macros are three-state, undefined, 0 or 1.  If they
 246    are defined to 0 then we must provide the relevant declaration
 247    here.  These checks will be in the undefined state while configure
 248    is running so be careful to test "defined (HAVE_DECL_*)".  */
 249
 250 #ifndef bcopy
 251 # ifdef HAVE_BCOPY
 252 #  if defined (HAVE_DECL_BCOPY) && !HAVE_DECL_BCOPY
 253 extern void bcopy PARAMS ((const PTR, PTR, size_t));
 254 #  endif
 255 # else /* ! HAVE_BCOPY */
 256 #  define bcopy(src,dst,len) memmove((dst),(src),(len))
 257 # endif
 258 #endif
 259
 260 #if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
 261 extern double atof PARAMS ((const char *));
 262 #endif
 263
 264 #if defined (HAVE_DECL_ATOL) && !HAVE_DECL_ATOL
 265 extern long atol PARAMS ((const char *));
 266 #endif
 267
 268 #if defined (HAVE_DECL_FREE) && !HAVE_DECL_FREE
 269 extern void free PARAMS ((PTR));
 270 #endif
 271
 272 #if defined (HAVE_DECL_GETCWD) && !HAVE_DECL_GETCWD
 273 extern char *getcwd PARAMS ((char *, size_t));
 274 #endif
 275
 276 #if defined (HAVE_DECL_GETENV) && !HAVE_DECL_GETENV
 277 extern char *getenv PARAMS ((const char *));
 278 #endif
 279
 280 #if defined (HAVE_DECL_GETOPT) && !HAVE_DECL_GETOPT
 281 extern int getopt PARAMS ((int, char * const *, const char *));
 282 #endif
 283
 284 #if defined (HAVE_DECL_GETWD) && !HAVE_DECL_GETWD
 285 extern char *getwd PARAMS ((char *));
 286 #endif
 287
 288 #if defined (HAVE_DECL_SBRK) && !HAVE_DECL_SBRK
 289 extern PTR sbrk PARAMS ((int));
 290 #endif
 291
 292 #if defined (HAVE_DECL_STRSTR) && !HAVE_DECL_STRSTR
 293 extern char *strstr PARAMS ((const char *, const char *));
 294 #endif
 295
 296 #ifdef HAVE_MALLOC_H
 297 #include <malloc.h>
 298 #endif
 299
 300 #if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC
 301 extern PTR malloc PARAMS ((size_t));
 302 #endif
 303
 304 #if defined (HAVE_DECL_CALLOC) && !HAVE_DECL_CALLOC
 305 extern PTR calloc PARAMS ((size_t, size_t));
 306 #endif
 307
 308 #if defined (HAVE_DECL_REALLOC) && !HAVE_DECL_REALLOC
 309 extern PTR realloc PARAMS ((PTR, size_t));
 310 #endif
 311
 312 /* If the system doesn't provide strsignal, we get it defined in
 313    libiberty but no declaration is supplied. */
 314 #ifndef HAVE_STRSIGNAL
 315 # ifndef strsignal
 316 extern const char *strsignal PARAMS ((int));
 317 # endif
 318 #endif
 319
 320 #ifdef HAVE_GETRLIMIT
 321 # if defined (HAVE_DECL_GETRLIMIT) && !HAVE_DECL_GETRLIMIT
 322 #  ifndef getrlimit
 323 #   ifdef ANSI_PROTOTYPES
 324 struct rlimit;
 325 #   endif
 326 extern int getrlimit PARAMS ((int, struct rlimit *));
 327 #  endif
 328 # endif
 329 #endif
 330
 331 #ifdef HAVE_SETRLIMIT
 332 # if defined (HAVE_DECL_SETRLIMIT) && !HAVE_DECL_SETRLIMIT
 333 #  ifndef setrlimit
 334 #   ifdef ANSI_PROTOTYPES
 335 struct rlimit;
 336 #   endif
 337 extern int setrlimit PARAMS ((int, const struct rlimit *));
 338 #  endif
 339 # endif
 340 #endif
 341
 342 /* HAVE_VOLATILE only refers to the stage1 compiler.  We also check
 343    __STDC__ and assume gcc sets it and has volatile in stage >=2. */
 344 #if !defined(HAVE_VOLATILE) && !defined(__STDC__) && !defined(volatile)
 345 #define volatile
 346 #endif
 347
 348 #if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
 349 extern void abort PARAMS ((void));
 350 #endif
 351
 352 /* 1 if we have C99 designated initializers.  */
 353 #if !defined(HAVE_DESIGNATED_INITIALIZERS)
 354 #define HAVE_DESIGNATED_INITIALIZERS \
 355   ((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L))
 356 #endif
 357
 358 /* Define a STRINGIFY macro that's right for ANSI or traditional C.
 359    Note: if the argument passed to STRINGIFY is itself a macro, eg
 360    #define foo bar, STRINGIFY(foo) will produce "foo", not "bar".
 361    Although the __STDC__ case could be made to expand this via a layer
 362    of indirection, the traditional C case can not do so.  Therefore
 363    this behavior is not supported. */
 364 #ifndef STRINGIFY
 365 # ifdef HAVE_STRINGIZE
 366 #  define STRINGIFY(STRING) #STRING
 367 # else
 368 #  define STRINGIFY(STRING) "STRING"
 369 # endif
 370 #endif /* ! STRINGIFY */
 371
 372 #if HAVE_SYS_STAT_H
 373 # include <sys/stat.h>
 374 #endif
 375
 376 /* Test if something is a normal file.  */
 377 #ifndef S_ISREG
 378 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 379 #endif
 380
 381 /* Test if something is a directory.  */
 382 #ifndef S_ISDIR
 383 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 384 #endif
 385
 386 /* Test if something is a character special file.  */
 387 #ifndef S_ISCHR
 388 #define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
 389 #endif
 390
 391 /* Test if something is a block special file.  */
 392 #ifndef S_ISBLK
 393 #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
 394 #endif
 395
 396 /* Test if something is a socket.  */
 397 #ifndef S_ISSOCK
 398 # ifdef S_IFSOCK
 399 #   define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
 400 # else
 401 #   define S_ISSOCK(m) 0
 402 # endif
 403 #endif
 404
 405 /* Test if something is a FIFO.  */
 406 #ifndef S_ISFIFO
 407 # ifdef S_IFIFO
 408 #  define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
 409 # else
 410 #  define S_ISFIFO(m) 0
 411 # endif
 412 #endif
 413
 414 /* Approximate O_NONBLOCK.  */
 415 #ifndef O_NONBLOCK
 416 #define O_NONBLOCK O_NDELAY
 417 #endif
 418
 419 /* Approximate O_NOCTTY.  */
 420 #ifndef O_NOCTTY
 421 #define O_NOCTTY 0
 422 #endif
 423
 424 /* Define well known filenos if the system does not define them.  */
 425 #ifndef STDIN_FILENO
 426 # define STDIN_FILENO   0
 427 #endif
 428 #ifndef STDOUT_FILENO
 429 # define STDOUT_FILENO  1
 430 #endif
 431 #ifndef STDERR_FILENO
 432 # define STDERR_FILENO  2
 433 #endif
 434
 435 /* Some systems have mkdir that takes a single argument. */
 436 #ifdef MKDIR_TAKES_ONE_ARG
 437 # define mkdir(a,b) mkdir(a)
 438 #endif
 439
 440 /* Provide a way to print an address via printf.  */
 441 #ifndef HOST_PTR_PRINTF
 442 # ifdef HAVE_PRINTF_PTR
 443 #  define HOST_PTR_PRINTF "%p"
 444 # else
 445 #  define HOST_PTR_PRINTF \
 446     (sizeof (int) == sizeof (char *) ? "%x" \
 447      : sizeof (long) == sizeof (char *) ? "%lx" : "%llx")
 448 # endif
 449 #endif /* ! HOST_PTR_PRINTF */
 450
 451 /* By default, colon separates directories in a path.  */
 452 #ifndef PATH_SEPARATOR
 453 #define PATH_SEPARATOR ':'
 454 #endif
 455
 456 #ifndef DIR_SEPARATOR
 457 #define DIR_SEPARATOR '/'
 458 #endif
 459
 460 /* Define IS_DIR_SEPARATOR.  */
 461 #ifndef DIR_SEPARATOR_2
 462 # define IS_DIR_SEPARATOR(CH) ((CH) == DIR_SEPARATOR)
 463 #else /* DIR_SEPARATOR_2 */
 464 # define IS_DIR_SEPARATOR(CH) \
 465         (((CH) == DIR_SEPARATOR) || ((CH) == DIR_SEPARATOR_2))
 466 #endif /* DIR_SEPARATOR_2 */
 467
 468 /* Say how to test for an absolute pathname.  On Unix systems, this is if
 469    it starts with a leading slash or a '$', the latter meaning the value of
 470    an environment variable is to be used.  On machien with DOS-based
 471    file systems, it is also absolute if it starts with a drive identifier.  */
 472 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
 473 #define IS_ABSOLUTE_PATHNAME(STR) \
 474   (IS_DIR_SEPARATOR ((STR)[0]) || (STR)[0] == '$' \
 475    || ((STR)[0] != '\0' && (STR)[1] == ':' && IS_DIR_SEPARATOR ((STR)[2])))
 476 #else
 477 #define IS_ABSOLUTE_PATHNAME(STR) \
 478   (IS_DIR_SEPARATOR ((STR)[0]) || (STR)[0] == '$')
 479 #endif
 480
 481 /* Get libiberty declarations. */
 482 #include "libiberty.h"
 483
 484 /* Make sure that ONLY_INT_FIELDS has an integral value.  */
 485 #ifdef ONLY_INT_FIELDS
 486 #undef ONLY_INT_FIELDS
 487 #define ONLY_INT_FIELDS 1
 488 #else
 489 #define ONLY_INT_FIELDS 0
 490 #endif
 491
 492 /* Provide a default for the HOST_BIT_BUCKET.
 493    This suffices for POSIX-like hosts.  */
 494
 495 #ifndef HOST_BIT_BUCKET
 496 #define HOST_BIT_BUCKET "/dev/null"
 497 #endif
 498
 499 /* Enumerated bitfields are safe to use unless we've been explictly told
 500    otherwise or if they are signed. */
 501
 502 #define USE_ENUM_BITFIELDS (__GNUC__ || (!ONLY_INT_FIELDS && ENUM_BITFIELDS_ARE_UNSIGNED))
 503
 504 #if USE_ENUM_BITFIELDS
 505 #define ENUM_BITFIELD(TYPE) enum TYPE
 506 #else
 507 #define ENUM_BITFIELD(TYPE) unsigned int
 508 #endif
 509
 510 #ifndef offsetof
 511 #define offsetof(TYPE, MEMBER)  ((size_t) &((TYPE *)0)->MEMBER)
 512 #endif
 513
 514 /* Traditional C cannot initialize union members of structs.  Provide
 515    a macro which expands appropriately to handle it.  This only works
 516    if you intend to initalize the union member to zero since it relies
 517    on default initialization to zero in the traditional C case.  */
 518 #ifdef __STDC__
 519 #define UNION_INIT_ZERO , {0}
 520 #else
 521 #define UNION_INIT_ZERO
 522 #endif
 523
 524 /* GCC now gives implicit declaration warnings for undeclared builtins.  */
 525 #if defined(__GNUC__) && defined (__SIZE_TYPE__)
 526 extern void *alloca (__SIZE_TYPE__);
 527 #endif
 528
 529 /* Various error reporting routines want to use __FUNCTION__.  */
 530 #if (GCC_VERSION < 2007)
 531 #ifndef __FUNCTION__
 532 #define __FUNCTION__ "?"
 533 #endif /* ! __FUNCTION__ */
 534 #endif
 535
 536 #endif /* __GCC_SYSTEM_H__ */