gcc/system.h

   1 /* Get common system includes and various definitions and declarations based
   2    on autoconf macros.
   3    Copyright (C) 1998-2013 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #ifndef GCC_SYSTEM_H
  23 #define GCC_SYSTEM_H
  24
  25 /* We must include stdarg.h before stdio.h.  */
  26 #include <stdarg.h>
  27
  28 #ifndef va_copy
  29 # ifdef __va_copy
  30 #   define va_copy(d,s)  __va_copy((d),(s))
  31 # else
  32 #   define va_copy(d,s)  ((d) = (s))
  33 # endif
  34 #endif
  35
  36 #ifdef HAVE_STDDEF_H
  37 # include <stddef.h>
  38 #endif
  39
  40 #include <stdio.h>
  41
  42 /* Define a generic NULL if one hasn't already been defined.  */
  43 #ifndef NULL
  44 #define NULL 0
  45 #endif
  46
  47 /* Use the unlocked open routines from libiberty.  */
  48
  49 /* Some of these are #define on some systems, e.g. on AIX to redirect
  50    the names to 64bit capable functions for LARGE_FILES support. These
  51    redefs are pointless here so we can override them.  */
  52
  53 #undef fopen
  54 #undef freopen
  55
  56 #define fopen(PATH,MODE) fopen_unlocked(PATH,MODE)
  57 #define fdopen(FILDES,MODE) fdopen_unlocked(FILDES,MODE)
  58 #define freopen(PATH,MODE,STREAM) freopen_unlocked(PATH,MODE,STREAM)
  59
  60 /* The compiler is not a multi-threaded application and therefore we
  61    do not have to use the locking functions.  In fact, using the locking
  62    functions can cause the compiler to be significantly slower under
  63    I/O bound conditions (such as -g -O0 on very large source files).
  64
  65    HAVE_DECL_PUTC_UNLOCKED actually indicates whether or not the stdio
  66    code is multi-thread safe by default.  If it is set to 0, then do
  67    not worry about using the _unlocked functions.
  68
  69    fputs_unlocked, fwrite_unlocked, and fprintf_unlocked are
  70    extensions and need to be prototyped by hand (since we do not
  71    define _GNU_SOURCE).  */
  72
  73 #if defined HAVE_DECL_PUTC_UNLOCKED && HAVE_DECL_PUTC_UNLOCKED
  74
  75 # ifdef HAVE_PUTC_UNLOCKED
  76 #  undef putc
  77 #  define putc(C, Stream) putc_unlocked (C, Stream)
  78 # endif
  79 # ifdef HAVE_PUTCHAR_UNLOCKED
  80 #  undef putchar
  81 #  define putchar(C) putchar_unlocked (C)
  82 # endif
  83 # ifdef HAVE_GETC_UNLOCKED
  84 #  undef getc
  85 #  define getc(Stream) getc_unlocked (Stream)
  86 # endif
  87 # ifdef HAVE_GETCHAR_UNLOCKED
  88 #  undef getchar
  89 #  define getchar() getchar_unlocked ()
  90 # endif
  91 # ifdef HAVE_FPUTC_UNLOCKED
  92 #  undef fputc
  93 #  define fputc(C, Stream) fputc_unlocked (C, Stream)
  94 # endif
  95
  96 #ifdef __cplusplus
  97 extern "C" {
  98 #endif
  99
 100 # ifdef HAVE_CLEARERR_UNLOCKED
 101 #  undef clearerr
 102 #  define clearerr(Stream) clearerr_unlocked (Stream)
 103 #  if defined (HAVE_DECL_CLEARERR_UNLOCKED) && !HAVE_DECL_CLEARERR_UNLOCKED
 104 extern void clearerr_unlocked (FILE *);
 105 #  endif
 106 # endif
 107 # ifdef HAVE_FEOF_UNLOCKED
 108 #  undef feof
 109 #  define feof(Stream) feof_unlocked (Stream)
 110 #  if defined (HAVE_DECL_FEOF_UNLOCKED) && !HAVE_DECL_FEOF_UNLOCKED
 111 extern int feof_unlocked (FILE *);
 112 #  endif
 113 # endif
 114 # ifdef HAVE_FILENO_UNLOCKED
 115 #  undef fileno
 116 #  define fileno(Stream) fileno_unlocked (Stream)
 117 #  if defined (HAVE_DECL_FILENO_UNLOCKED) && !HAVE_DECL_FILENO_UNLOCKED
 118 extern int fileno_unlocked (FILE *);
 119 #  endif
 120 # endif
 121 # ifdef HAVE_FFLUSH_UNLOCKED
 122 #  undef fflush
 123 #  define fflush(Stream) fflush_unlocked (Stream)
 124 #  if defined (HAVE_DECL_FFLUSH_UNLOCKED) && !HAVE_DECL_FFLUSH_UNLOCKED
 125 extern int fflush_unlocked (FILE *);
 126 #  endif
 127 # endif
 128 # ifdef HAVE_FGETC_UNLOCKED
 129 #  undef fgetc
 130 #  define fgetc(Stream) fgetc_unlocked (Stream)
 131 #  if defined (HAVE_DECL_FGETC_UNLOCKED) && !HAVE_DECL_FGETC_UNLOCKED
 132 extern int fgetc_unlocked (FILE *);
 133 #  endif
 134 # endif
 135 # ifdef HAVE_FGETS_UNLOCKED
 136 #  undef fgets
 137 #  define fgets(S, n, Stream) fgets_unlocked (S, n, Stream)
 138 #  if defined (HAVE_DECL_FGETS_UNLOCKED) && !HAVE_DECL_FGETS_UNLOCKED
 139 extern char *fgets_unlocked (char *, int, FILE *);
 140 #  endif
 141 # endif
 142 # ifdef HAVE_FPUTS_UNLOCKED
 143 #  undef fputs
 144 #  define fputs(String, Stream) fputs_unlocked (String, Stream)
 145 #  if defined (HAVE_DECL_FPUTS_UNLOCKED) && !HAVE_DECL_FPUTS_UNLOCKED
 146 extern int fputs_unlocked (const char *, FILE *);
 147 #  endif
 148 # endif
 149 # ifdef HAVE_FERROR_UNLOCKED
 150 #  undef ferror
 151 #  define ferror(Stream) ferror_unlocked (Stream)
 152 #  if defined (HAVE_DECL_FERROR_UNLOCKED) && !HAVE_DECL_FERROR_UNLOCKED
 153 extern int ferror_unlocked (FILE *);
 154 #  endif
 155 # endif
 156 # ifdef HAVE_FREAD_UNLOCKED
 157 #  undef fread
 158 #  define fread(Ptr, Size, N, Stream) fread_unlocked (Ptr, Size, N, Stream)
 159 #  if defined (HAVE_DECL_FREAD_UNLOCKED) && !HAVE_DECL_FREAD_UNLOCKED
 160 extern size_t fread_unlocked (void *, size_t, size_t, FILE *);
 161 #  endif
 162 # endif
 163 # ifdef HAVE_FWRITE_UNLOCKED
 164 #  undef fwrite
 165 #  define fwrite(Ptr, Size, N, Stream) fwrite_unlocked (Ptr, Size, N, Stream)
 166 #  if defined (HAVE_DECL_FWRITE_UNLOCKED) && !HAVE_DECL_FWRITE_UNLOCKED
 167 extern size_t fwrite_unlocked (const void *, size_t, size_t, FILE *);
 168 #  endif
 169 # endif
 170 # ifdef HAVE_FPRINTF_UNLOCKED
 171 #  undef fprintf
 172 /* We can't use a function-like macro here because we don't know if
 173    we have varargs macros.  */
 174 #  define fprintf fprintf_unlocked
 175 #  if defined (HAVE_DECL_FPRINTF_UNLOCKED) && !HAVE_DECL_FPRINTF_UNLOCKED
 176 extern int fprintf_unlocked (FILE *, const char *, ...);
 177 #  endif
 178 # endif
 179
 180 #ifdef __cplusplus
 181 }
 182 #endif
 183
 184 #endif
 185
 186 /* ??? Glibc's fwrite/fread_unlocked macros cause
 187    "warning: signed and unsigned type in conditional expression".  */
 188 #undef fread_unlocked
 189 #undef fwrite_unlocked
 190
 191 /* There are an extraordinary number of issues with <ctype.h>.
 192    The last straw is that it varies with the locale.  Use libiberty's
 193    replacement instead.  */
 194 #include "safe-ctype.h"
 195
 196 #include <sys/types.h>
 197
 198 #include <errno.h>
 199
 200 #if !defined (errno) && defined (HAVE_DECL_ERRNO) && !HAVE_DECL_ERRNO
 201 extern int errno;
 202 #endif
 203
 204 #ifdef __cplusplus
 205 # include <cstring>
 206 #endif
 207
 208 /* Some of glibc's string inlines cause warnings.  Plus we'd rather
 209    rely on (and therefore test) GCC's string builtins.  */
 210 #define __NO_STRING_INLINES
 211
 212 #ifdef STRING_WITH_STRINGS
 213 # include <string.h>
 214 # include <strings.h>
 215 #else
 216 # ifdef HAVE_STRING_H
 217 #  include <string.h>
 218 # else
 219 #  ifdef HAVE_STRINGS_H
 220 #   include <strings.h>
 221 #  endif
 222 # endif
 223 #endif
 224
 225 #ifdef HAVE_STDLIB_H
 226 # include <stdlib.h>
 227 #endif
 228
 229 /* When compiling C++ we need to include <cstdlib> as well as <stdlib.h> so
 230    that it is processed before we poison "malloc"; otherwise, if a source
 231    file uses a standard library header that includes <cstdlib>, we will get
 232    an error about 'using std::malloc'.  */
 233 #ifdef __cplusplus
 234 #include <cstdlib>
 235 #endif
 236
 237 /* Undef vec_free from AIX stdlib.h header which conflicts with vec.h.  */
 238 #undef vec_free
 239
 240 /* If we don't have an overriding definition, set SUCCESS_EXIT_CODE and
 241    FATAL_EXIT_CODE to EXIT_SUCCESS and EXIT_FAILURE respectively,
 242    or 0 and 1 if those macros are not defined.  */
 243 #ifndef SUCCESS_EXIT_CODE
 244 # ifdef EXIT_SUCCESS
 245 #  define SUCCESS_EXIT_CODE EXIT_SUCCESS
 246 # else
 247 #  define SUCCESS_EXIT_CODE 0
 248 # endif
 249 #endif
 250
 251 #ifndef FATAL_EXIT_CODE
 252 # ifdef EXIT_FAILURE
 253 #  define FATAL_EXIT_CODE EXIT_FAILURE
 254 # else
 255 #  define FATAL_EXIT_CODE 1
 256 # endif
 257 #endif
 258
 259 #define ICE_EXIT_CODE 4
 260
 261 #ifdef HAVE_UNISTD_H
 262 # include <unistd.h>
 263 #endif
 264
 265 #ifdef HAVE_SYS_PARAM_H
 266 # include <sys/param.h>
 267 /* We use this identifier later and it appears in some vendor param.h's.  */
 268 # undef PREFETCH
 269 #endif
 270
 271 #if HAVE_LIMITS_H
 272 # include <limits.h>
 273 #endif
 274
 275 /* Get definitions of HOST_WIDE_INT and HOST_WIDEST_INT.  */
 276 #include "hwint.h"
 277
 278 /* A macro to determine whether a VALUE lies inclusively within a
 279    certain range without evaluating the VALUE more than once.  This
 280    macro won't warn if the VALUE is unsigned and the LOWER bound is
 281    zero, as it would e.g. with "VALUE >= 0 && ...".  Note the LOWER
 282    bound *is* evaluated twice, and LOWER must not be greater than
 283    UPPER.  However the bounds themselves can be either positive or
 284    negative.  */
 285 #define IN_RANGE(VALUE, LOWER, UPPER) \
 286   ((unsigned HOST_WIDE_INT) (VALUE) - (unsigned HOST_WIDE_INT) (LOWER) \
 287    <= (unsigned HOST_WIDE_INT) (UPPER) - (unsigned HOST_WIDE_INT) (LOWER))
 288
 289 /* Infrastructure for defining missing _MAX and _MIN macros.  Note that
 290    macros defined with these cannot be used in #if.  */
 291
 292 /* The extra casts work around common compiler bugs.  */
 293 #define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 294 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 295    It is necessary at least when t == time_t.  */
 296 #define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \
 297                              ? ~ (t) 0 << (sizeof(t) * CHAR_BIT - 1) : (t) 0))
 298 #define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t)))
 299
 300 /* Use that infrastructure to provide a few constants.  */
 301 #ifndef UCHAR_MAX
 302 # define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char)
 303 #endif
 304
 305 #ifdef TIME_WITH_SYS_TIME
 306 # include <sys/time.h>
 307 # include <time.h>
 308 #else
 309 # if HAVE_SYS_TIME_H
 310 #  include <sys/time.h>
 311 # else
 312 #  ifdef HAVE_TIME_H
 313 #   include <time.h>
 314 #  endif
 315 # endif
 316 #endif
 317
 318 #ifdef HAVE_FCNTL_H
 319 # include <fcntl.h>
 320 #else
 321 # ifdef HAVE_SYS_FILE_H
 322 #  include <sys/file.h>
 323 # endif
 324 #endif
 325
 326 #ifndef SEEK_SET
 327 # define SEEK_SET 0
 328 # define SEEK_CUR 1
 329 # define SEEK_END 2
 330 #endif
 331 #ifndef F_OK
 332 # define F_OK 0
 333 # define X_OK 1
 334 # define W_OK 2
 335 # define R_OK 4
 336 #endif
 337 #ifndef O_RDONLY
 338 # define O_RDONLY 0
 339 #endif
 340 #ifndef O_WRONLY
 341 # define O_WRONLY 1
 342 #endif
 343 #ifndef O_BINARY
 344 # define O_BINARY 0
 345 #endif
 346
 347 /* Some systems define these in, e.g., param.h.  We undefine these names
 348    here to avoid the warnings.  We prefer to use our definitions since we
 349    know they are correct.  */
 350
 351 #undef MIN
 352 #undef MAX
 353 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
 354 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
 355
 356 /* Returns the least number N such that N * Y >= X.  */
 357 #define CEIL(x,y) (((x) + (y) - 1) / (y))
 358
 359 #ifdef HAVE_SYS_WAIT_H
 360 #include <sys/wait.h>
 361 #endif
 362
 363 #ifndef WIFSIGNALED
 364 #define WIFSIGNALED(S) (((S) & 0xff) != 0 && ((S) & 0xff) != 0x7f)
 365 #endif
 366 #ifndef WTERMSIG
 367 #define WTERMSIG(S) ((S) & 0x7f)
 368 #endif
 369 #ifndef WIFEXITED
 370 #define WIFEXITED(S) (((S) & 0xff) == 0)
 371 #endif
 372 #ifndef WEXITSTATUS
 373 #define WEXITSTATUS(S) (((S) & 0xff00) >> 8)
 374 #endif
 375 #ifndef WSTOPSIG
 376 #define WSTOPSIG WEXITSTATUS
 377 #endif
 378 #ifndef WCOREDUMP
 379 #define WCOREDUMP(S) ((S) & WCOREFLG)
 380 #endif
 381 #ifndef WCOREFLG
 382 #define WCOREFLG 0200
 383 #endif
 384
 385 #include <signal.h>
 386 #if !defined (SIGCHLD) && defined (SIGCLD)
 387 # define SIGCHLD SIGCLD
 388 #endif
 389
 390 #ifdef HAVE_SYS_MMAN_H
 391 # include <sys/mman.h>
 392 #endif
 393
 394 #ifndef MAP_FAILED
 395 # define MAP_FAILED ((void *)-1)
 396 #endif
 397
 398 #if !defined (MAP_ANONYMOUS) && defined (MAP_ANON)
 399 # define MAP_ANONYMOUS MAP_ANON
 400 #endif
 401
 402 #ifdef HAVE_SYS_RESOURCE_H
 403 # include <sys/resource.h>
 404 #endif
 405
 406 #ifdef HAVE_SYS_TIMES_H
 407 # include <sys/times.h>
 408 #endif
 409
 410 /* The HAVE_DECL_* macros are three-state, undefined, 0 or 1.  If they
 411    are defined to 0 then we must provide the relevant declaration
 412    here.  These checks will be in the undefined state while configure
 413    is running so be careful to test "defined (HAVE_DECL_*)".  */
 414
 415 #ifdef __cplusplus
 416 extern "C" {
 417 #endif
 418
 419 #if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
 420 extern double atof (const char *);
 421 #endif
 422
 423 #if defined (HAVE_DECL_ATOL) && !HAVE_DECL_ATOL
 424 extern long atol (const char *);
 425 #endif
 426
 427 #if defined (HAVE_DECL_FREE) && !HAVE_DECL_FREE
 428 extern void free (void *);
 429 #endif
 430
 431 #if defined (HAVE_DECL_GETCWD) && !HAVE_DECL_GETCWD
 432 extern char *getcwd (char *, size_t);
 433 #endif
 434
 435 #if defined (HAVE_DECL_GETENV) && !HAVE_DECL_GETENV
 436 extern char *getenv (const char *);
 437 #endif
 438
 439 #if defined (HAVE_DECL_GETOPT) && !HAVE_DECL_GETOPT
 440 extern int getopt (int, char * const *, const char *);
 441 #endif
 442
 443 #if defined (HAVE_DECL_GETPAGESIZE) && !HAVE_DECL_GETPAGESIZE
 444 extern int getpagesize (void);
 445 #endif
 446
 447 #if defined (HAVE_DECL_GETWD) && !HAVE_DECL_GETWD
 448 extern char *getwd (char *);
 449 #endif
 450
 451 #if defined (HAVE_DECL_SBRK) && !HAVE_DECL_SBRK
 452 extern void *sbrk (int);
 453 #endif
 454
 455 #if defined (HAVE_DECL_STRSTR) && !HAVE_DECL_STRSTR
 456 extern char *strstr (const char *, const char *);
 457 #endif
 458
 459 #if defined (HAVE_DECL_STPCPY) && !HAVE_DECL_STPCPY
 460 extern char *stpcpy (char *, const char *);
 461 #endif
 462
 463 #ifdef __cplusplus
 464 }
 465 #endif
 466
 467 #ifdef HAVE_MALLOC_H
 468 #include <malloc.h>
 469 #endif
 470
 471 #ifdef __cplusplus
 472 extern "C" {
 473 #endif
 474
 475 #if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC
 476 extern void *malloc (size_t);
 477 #endif
 478
 479 #if defined (HAVE_DECL_CALLOC) && !HAVE_DECL_CALLOC
 480 extern void *calloc (size_t, size_t);
 481 #endif
 482
 483 #if defined (HAVE_DECL_REALLOC) && !HAVE_DECL_REALLOC
 484 extern void *realloc (void *, size_t);
 485 #endif
 486
 487 #ifdef __cplusplus
 488 }
 489 #endif
 490
 491 #ifdef HAVE_STDINT_H
 492 #include <stdint.h>
 493 #endif
 494
 495 #ifdef HAVE_INTTYPES_H
 496 #include <inttypes.h>
 497 #endif
 498
 499 #ifdef __cplusplus
 500 extern "C" {
 501 #endif
 502
 503 /* If the system doesn't provide strsignal, we get it defined in
 504    libiberty but no declaration is supplied.  */
 505 #if !defined (HAVE_STRSIGNAL) \
 506     || (defined (HAVE_DECL_STRSIGNAL) && !HAVE_DECL_STRSIGNAL)
 507 # ifndef strsignal
 508 extern const char *strsignal (int);
 509 # endif
 510 #endif
 511
 512 #ifdef HAVE_GETRLIMIT
 513 # if defined (HAVE_DECL_GETRLIMIT) && !HAVE_DECL_GETRLIMIT
 514 #  ifndef getrlimit
 515 struct rlimit;
 516 extern int getrlimit (int, struct rlimit *);
 517 #  endif
 518 # endif
 519 #endif
 520
 521 #ifdef HAVE_SETRLIMIT
 522 # if defined (HAVE_DECL_SETRLIMIT) && !HAVE_DECL_SETRLIMIT
 523 #  ifndef setrlimit
 524 struct rlimit;
 525 extern int setrlimit (int, const struct rlimit *);
 526 #  endif
 527 # endif
 528 #endif
 529
 530 #if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
 531 extern void abort (void);
 532 #endif
 533
 534 #if defined (HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 535 extern int snprintf (char *, size_t, const char *, ...);
 536 #endif
 537
 538 #if defined (HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 539 extern int vsnprintf(char *, size_t, const char *, va_list);
 540 #endif
 541
 542 #ifdef __cplusplus
 543 }
 544 #endif
 545
 546 /* 1 if we have C99 designated initializers.  */
 547 #if !defined(HAVE_DESIGNATED_INITIALIZERS)
 548 #define HAVE_DESIGNATED_INITIALIZERS \
 549   (((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)) \
 550    && !defined(__cplusplus))
 551 #endif
 552
 553 #if !defined(HAVE_DESIGNATED_UNION_INITIALIZERS)
 554 #define HAVE_DESIGNATED_UNION_INITIALIZERS \
 555   (((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)) \
 556    && (!defined(__cplusplus) || (GCC_VERSION >= 4007)))
 557 #endif
 558
 559 #if HAVE_SYS_STAT_H
 560 # include <sys/stat.h>
 561 #endif
 562
 563 /* Test if something is a normal file.  */
 564 #ifndef S_ISREG
 565 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 566 #endif
 567
 568 /* Test if something is a directory.  */
 569 #ifndef S_ISDIR
 570 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 571 #endif
 572
 573 /* Test if something is a character special file.  */
 574 #ifndef S_ISCHR
 575 #define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
 576 #endif
 577
 578 /* Test if something is a block special file.  */
 579 #ifndef S_ISBLK
 580 #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
 581 #endif
 582
 583 /* Test if something is a socket.  */
 584 #ifndef S_ISSOCK
 585 # ifdef S_IFSOCK
 586 #   define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
 587 # else
 588 #   define S_ISSOCK(m) 0
 589 # endif
 590 #endif
 591
 592 /* Test if something is a FIFO.  */
 593 #ifndef S_ISFIFO
 594 # ifdef S_IFIFO
 595 #  define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
 596 # else
 597 #  define S_ISFIFO(m) 0
 598 # endif
 599 #endif
 600
 601 /* Define well known filenos if the system does not define them.  */
 602 #ifndef STDIN_FILENO
 603 # define STDIN_FILENO   0
 604 #endif
 605 #ifndef STDOUT_FILENO
 606 # define STDOUT_FILENO  1
 607 #endif
 608 #ifndef STDERR_FILENO
 609 # define STDERR_FILENO  2
 610 #endif
 611
 612 /* Some systems have mkdir that takes a single argument.  */
 613 #ifdef MKDIR_TAKES_ONE_ARG
 614 # define mkdir(a,b) mkdir(a)
 615 #endif
 616
 617 #ifndef HAVE_KILL
 618 # define kill(p,s) raise(s)
 619 #endif
 620
 621 /* Provide a way to print an address via printf.  */
 622 #ifndef HOST_PTR_PRINTF
 623 #define HOST_PTR_PRINTF "%p"
 624 #endif /* ! HOST_PTR_PRINTF */
 625
 626 /* By default, colon separates directories in a path.  */
 627 #ifndef PATH_SEPARATOR
 628 #define PATH_SEPARATOR ':'
 629 #endif
 630
 631 /* Filename handling macros.  */
 632 #include "filenames.h"
 633
 634 /* These should be phased out in favor of IS_DIR_SEPARATOR, where possible.  */
 635 #ifndef DIR_SEPARATOR
 636 # define DIR_SEPARATOR '/'
 637 # ifdef HAVE_DOS_BASED_FILE_SYSTEM
 638 #  define DIR_SEPARATOR_2 '\\'
 639 # endif
 640 #endif
 641
 642 #if defined (ENABLE_PLUGIN) && defined (HAVE_DLFCN_H)
 643 /* If plugin support is enabled, we could use libdl.  */
 644 #include <dlfcn.h>
 645 #endif
 646
 647 /* Do not introduce a gmp.h dependency on the build system.  */
 648 #ifndef GENERATOR_FILE
 649 #include <gmp.h>
 650 #endif
 651
 652 /* Get libiberty declarations.  */
 653 #include "libiberty.h"
 654
 655 #undef FFS  /* Some systems predefine this symbol; don't let it interfere.  */
 656 #undef FLOAT /* Likewise.  */
 657 #undef ABS /* Likewise.  */
 658 #undef PC /* Likewise.  */
 659
 660 /* Provide a default for the HOST_BIT_BUCKET.
 661    This suffices for POSIX-like hosts.  */
 662
 663 #ifndef HOST_BIT_BUCKET
 664 #define HOST_BIT_BUCKET "/dev/null"
 665 #endif
 666
 667 #ifndef offsetof
 668 #define offsetof(TYPE, MEMBER)  ((size_t) &((TYPE *) 0)->MEMBER)
 669 #endif
 670
 671 /* Various error reporting routines want to use __FUNCTION__.  */
 672 #if (GCC_VERSION < 2007)
 673 #ifndef __FUNCTION__
 674 #define __FUNCTION__ "?"
 675 #endif /* ! __FUNCTION__ */
 676 #endif
 677
 678 /* __builtin_expect(A, B) evaluates to A, but notifies the compiler that
 679    the most likely value of A is B.  This feature was added at some point
 680    between 2.95 and 3.0.  Let's use 3.0 as the lower bound for now.  */
 681 #if (GCC_VERSION < 3000)
 682 #define __builtin_expect(a, b) (a)
 683 #endif
 684
 685 /* Redefine abort to report an internal error w/o coredump, and
 686    reporting the location of the error in the source file.  */
 687 extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 688 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
 689
 690 /* Use gcc_assert(EXPR) to test invariants.  */
 691 #if ENABLE_ASSERT_CHECKING
 692 #define gcc_assert(EXPR)                                                \
 693    ((void)(!(EXPR) ? fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0 : 0))
 694 #elif (GCC_VERSION >= 4005)
 695 #define gcc_assert(EXPR)                                                \
 696   ((void)(__builtin_expect(!(EXPR), 0) ? __builtin_unreachable(), 0 : 0))
 697 #else
 698 /* Include EXPR, so that unused variable warnings do not occur.  */
 699 #define gcc_assert(EXPR) ((void)(0 && (EXPR)))
 700 #endif
 701
 702 #ifdef ENABLE_CHECKING
 703 #define gcc_checking_assert(EXPR) gcc_assert (EXPR)
 704 #else
 705 #define gcc_checking_assert(EXPR) ((void)(0 && (EXPR)))
 706 #endif
 707
 708 /* Use gcc_unreachable() to mark unreachable locations (like an
 709    unreachable default case of a switch.  Do not use gcc_assert(0).  */
 710 #if (GCC_VERSION >= 4005) && !ENABLE_ASSERT_CHECKING
 711 #define gcc_unreachable() __builtin_unreachable()
 712 #else
 713 #define gcc_unreachable() (fancy_abort (__FILE__, __LINE__, __FUNCTION__))
 714 #endif
 715
 716 /* Provide a fake boolean type.  We make no attempt to use the
 717    C99 _Bool, as it may not be available in the bootstrap compiler,
 718    and even if it is, it is liable to be buggy.
 719    This must be after all inclusion of system headers, as some of
 720    them will mess us up.  */
 721
 722 #undef TRUE
 723 #undef FALSE
 724
 725 #ifdef __cplusplus
 726   /* Obsolete.  */
 727 # define TRUE true
 728 # define FALSE false
 729 #else /* !__cplusplus */
 730 # undef bool
 731 # undef true
 732 # undef false
 733
 734 # define bool unsigned char
 735 # define true 1
 736 # define false 0
 737
 738   /* Obsolete.  */
 739 # define TRUE true
 740 # define FALSE false
 741 #endif /* !__cplusplus */
 742
 743 /* Some compilers do not allow the use of unsigned char in bitfields.  */
 744 #define BOOL_BITFIELD unsigned int
 745
 746 /* As the last action in this file, we poison the identifiers that
 747    shouldn't be used.  Note, luckily gcc-3.0's token-based integrated
 748    preprocessor won't trip on poisoned identifiers that arrive from
 749    the expansion of macros.  E.g. #define strrchr rindex, won't error
 750    if rindex is poisoned after this directive is issued and later on
 751    strrchr is called.
 752
 753    Note: We define bypass macros for the few cases where we really
 754    want to use the libc memory allocation routines.  Otherwise we
 755    insist you use the "x" versions from libiberty.  */
 756
 757 #define really_call_malloc malloc
 758 #define really_call_calloc calloc
 759 #define really_call_realloc realloc
 760
 761 #if defined(FLEX_SCANNER) || defined(YYBISON) || defined(YYBYACC)
 762 /* Flex and bison use malloc and realloc.  Yuk.  Note that this means
 763    really_call_* cannot be used in a .l or .y file.  */
 764 #define malloc xmalloc
 765 #define realloc xrealloc
 766 #endif
 767
 768 #if (GCC_VERSION >= 3000)
 769
 770 /* Note autoconf checks for prototype declarations and includes
 771    system.h while doing so.  Only poison these tokens if actually
 772    compiling gcc, so that the autoconf declaration tests for malloc
 773    etc don't spuriously fail.  */
 774 #ifdef IN_GCC
 775 #undef calloc
 776 #undef strdup
 777  #pragma GCC poison calloc strdup
 778
 779 #if !defined(FLEX_SCANNER) && !defined(YYBISON)
 780 #undef malloc
 781 #undef realloc
 782  #pragma GCC poison malloc realloc
 783 #endif
 784
 785 /* The %m format should be used when GCC's main diagnostic functions
 786    supporting %m are available, and xstrerror from libiberty
 787    otherwise.  */
 788 #undef strerror
 789  #pragma GCC poison strerror
 790
 791 /* loc_t is defined on some systems and too inviting for some
 792    programmers to avoid.  */
 793 #undef loc_t
 794  #pragma GCC poison loc_t
 795
 796 /* Old target macros that have moved to the target hooks structure.  */
 797  #pragma GCC poison ASM_OPEN_PAREN ASM_CLOSE_PAREN                      \
 798         FUNCTION_PROLOGUE FUNCTION_EPILOGUE                             \
 799         FUNCTION_END_PROLOGUE FUNCTION_BEGIN_EPILOGUE                   \
 800         DECL_MACHINE_ATTRIBUTES COMP_TYPE_ATTRIBUTES INSERT_ATTRIBUTES  \
 801         VALID_MACHINE_DECL_ATTRIBUTE VALID_MACHINE_TYPE_ATTRIBUTE       \
 802         SET_DEFAULT_TYPE_ATTRIBUTES SET_DEFAULT_DECL_ATTRIBUTES         \
 803         MERGE_MACHINE_TYPE_ATTRIBUTES MERGE_MACHINE_DECL_ATTRIBUTES     \
 804         MD_INIT_BUILTINS MD_EXPAND_BUILTIN ASM_OUTPUT_CONSTRUCTOR       \
 805         ASM_OUTPUT_DESTRUCTOR SIGNED_CHAR_SPEC MAX_CHAR_TYPE_SIZE       \
 806         WCHAR_UNSIGNED UNIQUE_SECTION SELECT_SECTION SELECT_RTX_SECTION \
 807         ENCODE_SECTION_INFO STRIP_NAME_ENCODING ASM_GLOBALIZE_LABEL     \
 808         ASM_OUTPUT_MI_THUNK CONST_COSTS RTX_COSTS DEFAULT_RTX_COSTS     \
 809         ADDRESS_COST MACHINE_DEPENDENT_REORG ASM_FILE_START ASM_FILE_END \
 810         ASM_SIMPLIFY_DWARF_ADDR INIT_TARGET_OPTABS INIT_SUBTARGET_OPTABS \
 811         INIT_GOFAST_OPTABS MULSI3_LIBCALL MULDI3_LIBCALL DIVSI3_LIBCALL \
 812         DIVDI3_LIBCALL UDIVSI3_LIBCALL UDIVDI3_LIBCALL MODSI3_LIBCALL   \
 813         MODDI3_LIBCALL UMODSI3_LIBCALL UMODDI3_LIBCALL BUILD_VA_LIST_TYPE \
 814         PRETEND_OUTGOING_VARARGS_NAMED STRUCT_VALUE_INCOMING_REGNUM     \
 815         ASM_OUTPUT_SECTION_NAME PROMOTE_FUNCTION_ARGS PROMOTE_FUNCTION_MODE \
 816         STRUCT_VALUE_INCOMING STRICT_ARGUMENT_NAMING                    \
 817         PROMOTE_FUNCTION_RETURN PROMOTE_PROTOTYPES STRUCT_VALUE_REGNUM  \
 818         SETUP_INCOMING_VARARGS EXPAND_BUILTIN_SAVEREGS                  \
 819         DEFAULT_SHORT_ENUMS SPLIT_COMPLEX_ARGS MD_ASM_CLOBBERS          \
 820         HANDLE_PRAGMA_REDEFINE_EXTNAME HANDLE_PRAGMA_EXTERN_PREFIX      \
 821         MUST_PASS_IN_STACK FUNCTION_ARG_PASS_BY_REFERENCE               \
 822         VECTOR_MODE_SUPPORTED_P TARGET_SUPPORTS_HIDDEN                  \
 823         FUNCTION_ARG_PARTIAL_NREGS ASM_OUTPUT_DWARF_DTPREL              \
 824         ALLOCATE_INITIAL_VALUE LEGITIMIZE_ADDRESS FRAME_POINTER_REQUIRED \
 825         CAN_ELIMINATE TRAMPOLINE_TEMPLATE INITIALIZE_TRAMPOLINE         \
 826         TRAMPOLINE_ADJUST_ADDRESS STATIC_CHAIN STATIC_CHAIN_INCOMING    \
 827         RETURN_POPS_ARGS UNITS_PER_SIMD_WORD OVERRIDE_OPTIONS           \
 828         OPTIMIZATION_OPTIONS CLASS_LIKELY_SPILLED_P                     \
 829         USING_SJLJ_EXCEPTIONS TARGET_UNWIND_INFO                        \
 830         LABEL_ALIGN_MAX_SKIP LOOP_ALIGN_MAX_SKIP                        \
 831         LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP JUMP_ALIGN_MAX_SKIP          \
 832         CAN_DEBUG_WITHOUT_FP UNLIKELY_EXECUTED_TEXT_SECTION_NAME        \
 833         HOT_TEXT_SECTION_NAME LEGITIMATE_CONSTANT_P ALWAYS_STRIP_DOTDOT \
 834         OUTPUT_ADDR_CONST_EXTRA SMALL_REGISTER_CLASSES ASM_OUTPUT_IDENT \
 835         ASM_BYTE_OP MEMBER_TYPE_FORCES_BLK
 836
 837 /* Target macros only used for code built for the target, that have
 838    moved to libgcc-tm.h or have never been present elsewhere.  */
 839  #pragma GCC poison DECLARE_LIBRARY_RENAMES LIBGCC2_GNU_PREFIX          \
 840         MD_UNWIND_SUPPORT MD_FROB_UPDATE_CONTEXT ENABLE_EXECUTE_STACK   \
 841         REG_VALUE_IN_UNWIND_CONTEXT ASSUME_EXTENDED_UNWIND_CONTEXT
 842
 843 /* Other obsolete target macros, or macros that used to be in target
 844    headers and were not used, and may be obsolete or may never have
 845    been used.  */
 846  #pragma GCC poison INT_ASM_OP ASM_OUTPUT_EH_REGION_BEG CPP_PREDEFINES     \
 847         ASM_OUTPUT_EH_REGION_END ASM_OUTPUT_LABELREF_AS_INT SMALL_STACK    \
 848         DOESNT_NEED_UNWINDER EH_TABLE_LOOKUP OBJC_SELECTORS_WITHOUT_LABELS \
 849         OMIT_EH_TABLE EASY_DIV_EXPR IMPLICIT_FIX_EXPR                      \
 850         LONGJMP_RESTORE_FROM_STACK MAX_INT_TYPE_SIZE ASM_IDENTIFY_GCC      \
 851         STDC_VALUE TRAMPOLINE_ALIGN ASM_IDENTIFY_GCC_AFTER_SOURCE          \
 852         SLOW_ZERO_EXTEND SUBREG_REGNO_OFFSET DWARF_LINE_MIN_INSTR_LENGTH   \
 853         TRADITIONAL_RETURN_FLOAT NO_BUILTIN_SIZE_TYPE                      \
 854         NO_BUILTIN_PTRDIFF_TYPE NO_BUILTIN_WCHAR_TYPE NO_BUILTIN_WINT_TYPE \
 855         BLOCK_PROFILER BLOCK_PROFILER_CODE FUNCTION_BLOCK_PROFILER         \
 856         FUNCTION_BLOCK_PROFILER_EXIT MACHINE_STATE_SAVE                    \
 857         MACHINE_STATE_RESTORE SCCS_DIRECTIVE SECTION_ASM_OP BYTEORDER      \
 858         ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL HOST_WORDS_BIG_ENDIAN    \
 859         OBJC_PROLOGUE ALLOCATE_TRAMPOLINE HANDLE_PRAGMA ROUND_TYPE_SIZE    \
 860         ROUND_TYPE_SIZE_UNIT CONST_SECTION_ASM_OP CRT_GET_RFIB_TEXT        \
 861         DBX_LBRAC_FIRST DBX_OUTPUT_ENUM DBX_OUTPUT_SOURCE_FILENAME         \
 862         DBX_WORKING_DIRECTORY INSN_CACHE_DEPTH INSN_CACHE_SIZE             \
 863         INSN_CACHE_LINE_WIDTH INIT_SECTION_PREAMBLE NEED_ATEXIT ON_EXIT    \
 864         EXIT_BODY OBJECT_FORMAT_ROSE MULTIBYTE_CHARS MAP_CHARACTER         \
 865         LIBGCC_NEEDS_DOUBLE FINAL_PRESCAN_LABEL DEFAULT_CALLER_SAVES       \
 866         LOAD_ARGS_REVERSED MAX_INTEGER_COMPUTATION_MODE                    \
 867         CONVERT_HARD_REGISTER_TO_SSA_P ASM_OUTPUT_MAIN_SOURCE_FILENAME     \
 868         FIRST_INSN_ADDRESS TEXT_SECTION SHARED_BSS_SECTION_ASM_OP          \
 869         PROMOTED_MODE EXPAND_BUILTIN_VA_END                                \
 870         LINKER_DOES_NOT_WORK_WITH_DWARF2 FUNCTION_ARG_KEEP_AS_REFERENCE    \
 871         GIV_SORT_CRITERION MAX_LONG_TYPE_SIZE MAX_LONG_DOUBLE_TYPE_SIZE    \
 872         MAX_WCHAR_TYPE_SIZE SHARED_SECTION_ASM_OP INTEGRATE_THRESHOLD      \
 873         FINAL_REG_PARM_STACK_SPACE MAYBE_REG_PARM_STACK_SPACE              \
 874         TRADITIONAL_PIPELINE_INTERFACE DFA_PIPELINE_INTERFACE              \
 875         DBX_OUTPUT_STANDARD_TYPES BUILTIN_SETJMP_FRAME_VALUE               \
 876         SUNOS4_SHARED_LIBRARIES PROMOTE_FOR_CALL_ONLY                      \
 877         SPACE_AFTER_L_OPTION NO_RECURSIVE_FUNCTION_CSE                     \
 878         DEFAULT_MAIN_RETURN TARGET_MEM_FUNCTIONS EXPAND_BUILTIN_VA_ARG     \
 879         COLLECT_PARSE_FLAG DWARF2_GENERATE_TEXT_SECTION_LABEL WINNING_GDB  \
 880         ASM_OUTPUT_FILENAME ASM_OUTPUT_SOURCE_LINE FILE_NAME_JOINER        \
 881         GDB_INV_REF_REGPARM_STABS_LETTER DBX_MEMPARM_STABS_LETTER          \
 882         PUT_SDB_SRC_FILE STABS_GCC_MARKER DBX_OUTPUT_FUNCTION_END          \
 883         DBX_OUTPUT_GCC_MARKER DBX_FINISH_SYMBOL SDB_GENERATE_FAKE          \
 884         NON_SAVING_SETJMP TARGET_LATE_RTL_PROLOGUE_EPILOGUE                \
 885         CASE_DROPS_THROUGH TARGET_BELL TARGET_BS TARGET_CR TARGET_DIGIT0   \
 886         TARGET_ESC TARGET_FF TARGET_NEWLINE TARGET_TAB TARGET_VT           \
 887         LINK_LIBGCC_SPECIAL DONT_ACCESS_GBLS_AFTER_EPILOGUE                \
 888         TARGET_OPTIONS TARGET_SWITCHES EXTRA_CC_MODES FINALIZE_PIC         \
 889         PREDICATE_CODES SPECIAL_MODE_PREDICATES UNALIGNED_WORD_ASM_OP      \
 890         EXTRA_SECTIONS EXTRA_SECTION_FUNCTIONS READONLY_DATA_SECTION       \
 891         TARGET_ASM_EXCEPTION_SECTION TARGET_ASM_EH_FRAME_SECTION           \
 892         SMALL_ARG_MAX ASM_OUTPUT_SHARED_BSS ASM_OUTPUT_SHARED_COMMON       \
 893         ASM_OUTPUT_SHARED_LOCAL ASM_MAKE_LABEL_LINKONCE                    \
 894         STACK_CHECK_PROBE_INTERVAL STACK_CHECK_PROBE_LOAD                  \
 895         ORDER_REGS_FOR_LOCAL_ALLOC FUNCTION_OUTGOING_VALUE                 \
 896         ASM_DECLARE_CONSTANT_NAME MODIFY_TARGET_NAME SWITCHES_NEED_SPACES  \
 897         SWITCH_CURTAILS_COMPILATION SWITCH_TAKES_ARG WORD_SWITCH_TAKES_ARG \
 898         TARGET_OPTION_TRANSLATE_TABLE HANDLE_PRAGMA_PACK_PUSH_POP          \
 899         HANDLE_SYSV_PRAGMA HANDLE_PRAGMA_WEAK CONDITIONAL_REGISTER_USAGE   \
 900         FUNCTION_ARG_BOUNDARY MUST_USE_SJLJ_EXCEPTIONS US_SOFTWARE_GOFAST  \
 901         USING_SVR4_H SVR4_ASM_SPEC FUNCTION_ARG FUNCTION_ARG_ADVANCE       \
 902         FUNCTION_INCOMING_ARG IRA_COVER_CLASSES TARGET_VERSION             \
 903         MACHINE_TYPE TARGET_HAS_TARGETCM ASM_OUTPUT_BSS                    \
 904         SETJMP_VIA_SAVE_AREA FORBIDDEN_INC_DEC_CLASSES                     \
 905         PREFERRED_OUTPUT_RELOAD_CLASS SYSTEM_INCLUDE_DIR                   \
 906         STANDARD_INCLUDE_DIR STANDARD_INCLUDE_COMPONENT                    \
 907         LINK_ELIMINATE_DUPLICATE_LDIRECTORIES MIPS_DEBUGGING_INFO          \
 908         IDENT_ASM_OP ALL_COP_ADDITIONAL_REGISTER_NAMES DBX_OUTPUT_LBRAC    \
 909         DBX_OUTPUT_NFUN DBX_OUTPUT_RBRAC RANGE_TEST_NON_SHORT_CIRCUIT      \
 910         REAL_VALUE_TRUNCATE REVERSE_CONDEXEC_PREDICATES_P                  \
 911         TARGET_ALIGN_ANON_BITFIELDS TARGET_NARROW_VOLATILE_BITFIELDS       \
 912         IDENT_ASM_OP UNALIGNED_SHORT_ASM_OP UNALIGNED_INT_ASM_OP           \
 913         UNALIGNED_LONG_ASM_OP UNALIGNED_DOUBLE_INT_ASM_OP                  \
 914         USE_COMMON_FOR_ONE_ONLY IFCVT_EXTRA_FIELDS IFCVT_INIT_EXTRA_FIELDS \
 915         CASE_USE_BIT_TESTS FIXUNS_TRUNC_LIKE_FIX_TRUNC                     \
 916         GO_IF_MODE_DEPENDENT_ADDRESS DELAY_SLOTS_FOR_EPILOGUE              \
 917         ELIGIBLE_FOR_EPILOGUE_DELAY
 918
 919 /* Hooks that are no longer used.  */
 920  #pragma GCC poison LANG_HOOKS_FUNCTION_MARK LANG_HOOKS_FUNCTION_FREE   \
 921         LANG_HOOKS_MARK_TREE LANG_HOOKS_INSERT_DEFAULT_ATTRIBUTES \
 922         LANG_HOOKS_TREE_INLINING_ESTIMATE_NUM_INSNS \
 923         LANG_HOOKS_PUSHLEVEL LANG_HOOKS_SET_BLOCK \
 924         LANG_HOOKS_MAYBE_BUILD_CLEANUP LANG_HOOKS_UPDATE_DECL_AFTER_SAVING \
 925         LANG_HOOKS_POPLEVEL LANG_HOOKS_TRUTHVALUE_CONVERSION \
 926         TARGET_PROMOTE_FUNCTION_ARGS TARGET_PROMOTE_FUNCTION_RETURN \
 927         LANG_HOOKS_MISSING_ARGUMENT LANG_HOOKS_HASH_TYPES \
 928         TARGET_HANDLE_OFAST TARGET_OPTION_OPTIMIZATION \
 929         TARGET_IRA_COVER_CLASSES TARGET_HELP \
 930         TARGET_HANDLE_PRAGMA_EXTERN_PREFIX \
 931         TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN \
 932         TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD \
 933
 934 /* Arrays that were deleted in favor of a functional interface.  */
 935  #pragma GCC poison built_in_decls implicit_built_in_decls
 936
 937 /* Hooks into libgcc2.  */
 938  #pragma GCC poison LIBGCC2_DOUBLE_TYPE_SIZE LIBGCC2_WORDS_BIG_ENDIAN \
 939    LIBGCC2_FLOAT_WORDS_BIG_ENDIAN
 940
 941 /* Miscellaneous macros that are no longer used.  */
 942  #pragma GCC poison USE_MAPPED_LOCATION GET_ENVIRONMENT
 943
 944 /* Libiberty macros that are no longer used in GCC.  */
 945 #undef ANSI_PROTOTYPES
 946 #undef PTR_CONST
 947 #undef LONG_DOUBLE
 948 #undef VPARAMS
 949 #undef VA_OPEN
 950 #undef VA_FIXEDARG
 951 #undef VA_CLOSE
 952 #undef VA_START
 953  #pragma GCC poison ANSI_PROTOTYPES PTR_CONST LONG_DOUBLE VPARAMS VA_OPEN \
 954   VA_FIXEDARG VA_CLOSE VA_START
 955 #endif /* IN_GCC */
 956
 957 /* Front ends should never have to include middle-end headers.  Enforce
 958    this by poisoning the header double-include protection defines.  */
 959 #ifdef IN_GCC_FRONTEND
 960 #pragma GCC poison GCC_RTL_H GCC_EXCEPT_H GCC_EXPR_H
 961 #endif
 962
 963 /* Note: not all uses of the `index' token (e.g. variable names and
 964    structure members) have been eliminated.  */
 965 #undef bcopy
 966 #undef bzero
 967 #undef bcmp
 968 #undef rindex
 969  #pragma GCC poison bcopy bzero bcmp rindex
 970
 971 #endif /* GCC >= 3.0 */
 972
 973 /* This macro allows casting away const-ness to pass -Wcast-qual
 974    warnings.  DO NOT USE THIS UNLESS YOU REALLY HAVE TO!  It should
 975    only be used in certain specific cases.  One valid case is where
 976    the C standard definitions or prototypes force you to.  E.g. if you
 977    need to free a const object, or if you pass a const string to
 978    execv, et al.  Another valid use would be in an allocation function
 979    that creates const objects that need to be initialized.  In some
 980    cases we have non-const functions that return the argument
 981    (e.g. next_nonnote_insn).  Rather than create const shadow
 982    functions, we can cast away const-ness in calling these interfaces
 983    if we're careful to verify that the called function does indeed not
 984    modify its argument and the return value is only used in a const
 985    context.  (This can be somewhat dangerous as these assumptions can
 986    change after the fact).  Beyond these uses, most other cases of
 987    using this macro should be viewed with extreme caution.  */
 988
 989 #ifdef __cplusplus
 990 #define CONST_CAST2(TOTYPE,FROMTYPE,X) (const_cast<TOTYPE> (X))
 991 #else
 992 #if defined(__GNUC__) && GCC_VERSION > 4000
 993 /* GCC 4.0.x has a bug where it may ICE on this expression,
 994    so does GCC 3.4.x (PR17436).  */
 995 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
 996 #elif defined(__GNUC__)
 997 static inline char *
 998 helper_const_non_const_cast (const char *p)
 999 {
1000   union {
1001     const char *const_c;
1002     char *c;
1003   } val;
1004   val.const_c = p;
1005   return val.c;
1006 }
1007
1008 #define CONST_CAST2(TOTYPE,FROMTYPE,X) \
1009         ((TOTYPE) helper_const_non_const_cast ((const char *) (FROMTYPE) (X)))
1010 #else
1011 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((TOTYPE)(FROMTYPE)(X))
1012 #endif
1013 #endif
1014 #define CONST_CAST(TYPE,X) CONST_CAST2(TYPE, const TYPE, (X))
1015 #define CONST_CAST_TREE(X) CONST_CAST(union tree_node *, (X))
1016 #define CONST_CAST_RTX(X) CONST_CAST(struct rtx_def *, (X))
1017 #define CONST_CAST_BB(X) CONST_CAST(struct basic_block_def *, (X))
1018 #define CONST_CAST_GIMPLE(X) CONST_CAST(union gimple_statement_d *, (X))
1019
1020 /* Activate certain diagnostics as warnings (not errors via the
1021    -Werror flag).  */
1022 #if GCC_VERSION >= 4003
1023 /* If asserts are disabled, activate -Wuninitialized as a warning (not
1024    an error/-Werror).  */
1025 #ifndef ENABLE_ASSERT_CHECKING
1026 #pragma GCC diagnostic warning "-Wuninitialized"
1027 #endif
1028 #endif
1029
1030 #ifdef ENABLE_VALGRIND_CHECKING
1031 # ifdef HAVE_VALGRIND_MEMCHECK_H
1032 #  include <valgrind/memcheck.h>
1033 # elif defined HAVE_MEMCHECK_H
1034 #  include <memcheck.h>
1035 # else
1036 #  include <valgrind.h>
1037 # endif
1038 /* Compatibility macros to let valgrind 3.1 work.  */
1039 # ifndef VALGRIND_MAKE_MEM_NOACCESS
1040 #  define VALGRIND_MAKE_MEM_NOACCESS VALGRIND_MAKE_NOACCESS
1041 # endif
1042 # ifndef VALGRIND_MAKE_MEM_DEFINED
1043 #  define VALGRIND_MAKE_MEM_DEFINED VALGRIND_MAKE_READABLE
1044 # endif
1045 # ifndef VALGRIND_MAKE_MEM_UNDEFINED
1046 #  define VALGRIND_MAKE_MEM_UNDEFINED VALGRIND_MAKE_WRITABLE
1047 # endif
1048 #else
1049 /* Avoid #ifdef:s when we can help it.  */
1050 #define VALGRIND_DISCARD(x)
1051 #define VALGRIND_MALLOCLIKE_BLOCK(w,x,y,z)
1052 #define VALGRIND_FREELIKE_BLOCK(x,y)
1053 #endif
1054
1055 /* In LTO -fwhole-program build we still want to keep the debug functions available
1056    for debugger.  Mark them as used to prevent removal.  */
1057 #if (GCC_VERSION > 4000)
1058 #define DEBUG_FUNCTION __attribute__ ((__used__))
1059 #define DEBUG_VARIABLE __attribute__ ((__used__))
1060 #else
1061 #define DEBUG_FUNCTION
1062 #define DEBUG_VARIABLE
1063 #endif
1064
1065 #endif /* ! GCC_SYSTEM_H */