gcc/system.h

   1 /* Get common system includes and various definitions and declarations based
   2    on autoconf macros.
   3    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008,
   4    2009, 2010, 2011, 2012
   5    Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 3, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23
  24 #ifndef GCC_SYSTEM_H
  25 #define GCC_SYSTEM_H
  26
  27 /* We must include stdarg.h before stdio.h.  */
  28 #include <stdarg.h>
  29
  30 #ifndef va_copy
  31 # ifdef __va_copy
  32 #   define va_copy(d,s)  __va_copy((d),(s))
  33 # else
  34 #   define va_copy(d,s)  ((d) = (s))
  35 # endif
  36 #endif
  37
  38 #ifdef HAVE_STDDEF_H
  39 # include <stddef.h>
  40 #endif
  41
  42 #include <stdio.h>
  43
  44 /* Define a generic NULL if one hasn't already been defined.  */
  45 #ifndef NULL
  46 #define NULL 0
  47 #endif
  48
  49 /* Use the unlocked open routines from libiberty.  */
  50
  51 /* Some of these are #define on some systems, e.g. on AIX to redirect
  52    the names to 64bit capable functions for LARGE_FILES support. These
  53    redefs are pointless here so we can override them.  */
  54
  55 #undef fopen
  56 #undef freopen
  57
  58 #define fopen(PATH,MODE) fopen_unlocked(PATH,MODE)
  59 #define fdopen(FILDES,MODE) fdopen_unlocked(FILDES,MODE)
  60 #define freopen(PATH,MODE,STREAM) freopen_unlocked(PATH,MODE,STREAM)
  61
  62 /* The compiler is not a multi-threaded application and therefore we
  63    do not have to use the locking functions.  In fact, using the locking
  64    functions can cause the compiler to be significantly slower under
  65    I/O bound conditions (such as -g -O0 on very large source files).
  66
  67    HAVE_DECL_PUTC_UNLOCKED actually indicates whether or not the stdio
  68    code is multi-thread safe by default.  If it is set to 0, then do
  69    not worry about using the _unlocked functions.
  70
  71    fputs_unlocked, fwrite_unlocked, and fprintf_unlocked are
  72    extensions and need to be prototyped by hand (since we do not
  73    define _GNU_SOURCE).  */
  74
  75 #if defined HAVE_DECL_PUTC_UNLOCKED && HAVE_DECL_PUTC_UNLOCKED
  76
  77 # ifdef HAVE_PUTC_UNLOCKED
  78 #  undef putc
  79 #  define putc(C, Stream) putc_unlocked (C, Stream)
  80 # endif
  81 # ifdef HAVE_PUTCHAR_UNLOCKED
  82 #  undef putchar
  83 #  define putchar(C) putchar_unlocked (C)
  84 # endif
  85 # ifdef HAVE_GETC_UNLOCKED
  86 #  undef getc
  87 #  define getc(Stream) getc_unlocked (Stream)
  88 # endif
  89 # ifdef HAVE_GETCHAR_UNLOCKED
  90 #  undef getchar
  91 #  define getchar() getchar_unlocked ()
  92 # endif
  93 # ifdef HAVE_FPUTC_UNLOCKED
  94 #  undef fputc
  95 #  define fputc(C, Stream) fputc_unlocked (C, Stream)
  96 # endif
  97
  98 #ifdef __cplusplus
  99 extern "C" {
 100 #endif
 101
 102 # ifdef HAVE_CLEARERR_UNLOCKED
 103 #  undef clearerr
 104 #  define clearerr(Stream) clearerr_unlocked (Stream)
 105 #  if defined (HAVE_DECL_CLEARERR_UNLOCKED) && !HAVE_DECL_CLEARERR_UNLOCKED
 106 extern void clearerr_unlocked (FILE *);
 107 #  endif
 108 # endif
 109 # ifdef HAVE_FEOF_UNLOCKED
 110 #  undef feof
 111 #  define feof(Stream) feof_unlocked (Stream)
 112 #  if defined (HAVE_DECL_FEOF_UNLOCKED) && !HAVE_DECL_FEOF_UNLOCKED
 113 extern int feof_unlocked (FILE *);
 114 #  endif
 115 # endif
 116 # ifdef HAVE_FILENO_UNLOCKED
 117 #  undef fileno
 118 #  define fileno(Stream) fileno_unlocked (Stream)
 119 #  if defined (HAVE_DECL_FILENO_UNLOCKED) && !HAVE_DECL_FILENO_UNLOCKED
 120 extern int fileno_unlocked (FILE *);
 121 #  endif
 122 # endif
 123 # ifdef HAVE_FFLUSH_UNLOCKED
 124 #  undef fflush
 125 #  define fflush(Stream) fflush_unlocked (Stream)
 126 #  if defined (HAVE_DECL_FFLUSH_UNLOCKED) && !HAVE_DECL_FFLUSH_UNLOCKED
 127 extern int fflush_unlocked (FILE *);
 128 #  endif
 129 # endif
 130 # ifdef HAVE_FGETC_UNLOCKED
 131 #  undef fgetc
 132 #  define fgetc(Stream) fgetc_unlocked (Stream)
 133 #  if defined (HAVE_DECL_FGETC_UNLOCKED) && !HAVE_DECL_FGETC_UNLOCKED
 134 extern int fgetc_unlocked (FILE *);
 135 #  endif
 136 # endif
 137 # ifdef HAVE_FGETS_UNLOCKED
 138 #  undef fgets
 139 #  define fgets(S, n, Stream) fgets_unlocked (S, n, Stream)
 140 #  if defined (HAVE_DECL_FGETS_UNLOCKED) && !HAVE_DECL_FGETS_UNLOCKED
 141 extern char *fgets_unlocked (char *, int, FILE *);
 142 #  endif
 143 # endif
 144 # ifdef HAVE_FPUTS_UNLOCKED
 145 #  undef fputs
 146 #  define fputs(String, Stream) fputs_unlocked (String, Stream)
 147 #  if defined (HAVE_DECL_FPUTS_UNLOCKED) && !HAVE_DECL_FPUTS_UNLOCKED
 148 extern int fputs_unlocked (const char *, FILE *);
 149 #  endif
 150 # endif
 151 # ifdef HAVE_FERROR_UNLOCKED
 152 #  undef ferror
 153 #  define ferror(Stream) ferror_unlocked (Stream)
 154 #  if defined (HAVE_DECL_FERROR_UNLOCKED) && !HAVE_DECL_FERROR_UNLOCKED
 155 extern int ferror_unlocked (FILE *);
 156 #  endif
 157 # endif
 158 # ifdef HAVE_FREAD_UNLOCKED
 159 #  undef fread
 160 #  define fread(Ptr, Size, N, Stream) fread_unlocked (Ptr, Size, N, Stream)
 161 #  if defined (HAVE_DECL_FREAD_UNLOCKED) && !HAVE_DECL_FREAD_UNLOCKED
 162 extern size_t fread_unlocked (void *, size_t, size_t, FILE *);
 163 #  endif
 164 # endif
 165 # ifdef HAVE_FWRITE_UNLOCKED
 166 #  undef fwrite
 167 #  define fwrite(Ptr, Size, N, Stream) fwrite_unlocked (Ptr, Size, N, Stream)
 168 #  if defined (HAVE_DECL_FWRITE_UNLOCKED) && !HAVE_DECL_FWRITE_UNLOCKED
 169 extern size_t fwrite_unlocked (const void *, size_t, size_t, FILE *);
 170 #  endif
 171 # endif
 172 # ifdef HAVE_FPRINTF_UNLOCKED
 173 #  undef fprintf
 174 /* We can't use a function-like macro here because we don't know if
 175    we have varargs macros.  */
 176 #  define fprintf fprintf_unlocked
 177 #  if defined (HAVE_DECL_FPRINTF_UNLOCKED) && !HAVE_DECL_FPRINTF_UNLOCKED
 178 extern int fprintf_unlocked (FILE *, const char *, ...);
 179 #  endif
 180 # endif
 181
 182 #ifdef __cplusplus
 183 }
 184 #endif
 185
 186 #endif
 187
 188 /* ??? Glibc's fwrite/fread_unlocked macros cause
 189    "warning: signed and unsigned type in conditional expression".  */
 190 #undef fread_unlocked
 191 #undef fwrite_unlocked
 192
 193 /* There are an extraordinary number of issues with <ctype.h>.
 194    The last straw is that it varies with the locale.  Use libiberty's
 195    replacement instead.  */
 196 #include "safe-ctype.h"
 197
 198 #include <sys/types.h>
 199
 200 #include <errno.h>
 201
 202 #if !defined (errno) && defined (HAVE_DECL_ERRNO) && !HAVE_DECL_ERRNO
 203 extern int errno;
 204 #endif
 205
 206 #ifdef __cplusplus
 207 # include <cstring>
 208 #endif
 209
 210 /* Some of glibc's string inlines cause warnings.  Plus we'd rather
 211    rely on (and therefore test) GCC's string builtins.  */
 212 #define __NO_STRING_INLINES
 213
 214 #ifdef STRING_WITH_STRINGS
 215 # include <string.h>
 216 # include <strings.h>
 217 #else
 218 # ifdef HAVE_STRING_H
 219 #  include <string.h>
 220 # else
 221 #  ifdef HAVE_STRINGS_H
 222 #   include <strings.h>
 223 #  endif
 224 # endif
 225 #endif
 226
 227 #ifdef HAVE_STDLIB_H
 228 # include <stdlib.h>
 229 #endif
 230
 231 /* If we don't have an overriding definition, set SUCCESS_EXIT_CODE and
 232    FATAL_EXIT_CODE to EXIT_SUCCESS and EXIT_FAILURE respectively,
 233    or 0 and 1 if those macros are not defined.  */
 234 #ifndef SUCCESS_EXIT_CODE
 235 # ifdef EXIT_SUCCESS
 236 #  define SUCCESS_EXIT_CODE EXIT_SUCCESS
 237 # else
 238 #  define SUCCESS_EXIT_CODE 0
 239 # endif
 240 #endif
 241
 242 #ifndef FATAL_EXIT_CODE
 243 # ifdef EXIT_FAILURE
 244 #  define FATAL_EXIT_CODE EXIT_FAILURE
 245 # else
 246 #  define FATAL_EXIT_CODE 1
 247 # endif
 248 #endif
 249
 250 #define ICE_EXIT_CODE 4
 251
 252 #ifdef HAVE_UNISTD_H
 253 # include <unistd.h>
 254 #endif
 255
 256 #ifdef HAVE_SYS_PARAM_H
 257 # include <sys/param.h>
 258 /* We use this identifier later and it appears in some vendor param.h's.  */
 259 # undef PREFETCH
 260 #endif
 261
 262 #if HAVE_LIMITS_H
 263 # include <limits.h>
 264 #endif
 265
 266 /* Get definitions of HOST_WIDE_INT and HOST_WIDEST_INT.  */
 267 #include "hwint.h"
 268
 269 /* A macro to determine whether a VALUE lies inclusively within a
 270    certain range without evaluating the VALUE more than once.  This
 271    macro won't warn if the VALUE is unsigned and the LOWER bound is
 272    zero, as it would e.g. with "VALUE >= 0 && ...".  Note the LOWER
 273    bound *is* evaluated twice, and LOWER must not be greater than
 274    UPPER.  However the bounds themselves can be either positive or
 275    negative.  */
 276 #define IN_RANGE(VALUE, LOWER, UPPER) \
 277   ((unsigned HOST_WIDE_INT) (VALUE) - (unsigned HOST_WIDE_INT) (LOWER) \
 278    <= (unsigned HOST_WIDE_INT) (UPPER) - (unsigned HOST_WIDE_INT) (LOWER))
 279
 280 /* Infrastructure for defining missing _MAX and _MIN macros.  Note that
 281    macros defined with these cannot be used in #if.  */
 282
 283 /* The extra casts work around common compiler bugs.  */
 284 #define INTTYPE_SIGNED(t) (! ((t) 0 < (t) -1))
 285 /* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
 286    It is necessary at least when t == time_t.  */
 287 #define INTTYPE_MINIMUM(t) ((t) (INTTYPE_SIGNED (t) \
 288                              ? ~ (t) 0 << (sizeof(t) * CHAR_BIT - 1) : (t) 0))
 289 #define INTTYPE_MAXIMUM(t) ((t) (~ (t) 0 - INTTYPE_MINIMUM (t)))
 290
 291 /* Use that infrastructure to provide a few constants.  */
 292 #ifndef UCHAR_MAX
 293 # define UCHAR_MAX INTTYPE_MAXIMUM (unsigned char)
 294 #endif
 295
 296 #ifdef TIME_WITH_SYS_TIME
 297 # include <sys/time.h>
 298 # include <time.h>
 299 #else
 300 # if HAVE_SYS_TIME_H
 301 #  include <sys/time.h>
 302 # else
 303 #  ifdef HAVE_TIME_H
 304 #   include <time.h>
 305 #  endif
 306 # endif
 307 #endif
 308
 309 #ifdef HAVE_FCNTL_H
 310 # include <fcntl.h>
 311 #else
 312 # ifdef HAVE_SYS_FILE_H
 313 #  include <sys/file.h>
 314 # endif
 315 #endif
 316
 317 #ifndef SEEK_SET
 318 # define SEEK_SET 0
 319 # define SEEK_CUR 1
 320 # define SEEK_END 2
 321 #endif
 322 #ifndef F_OK
 323 # define F_OK 0
 324 # define X_OK 1
 325 # define W_OK 2
 326 # define R_OK 4
 327 #endif
 328 #ifndef O_RDONLY
 329 # define O_RDONLY 0
 330 #endif
 331 #ifndef O_WRONLY
 332 # define O_WRONLY 1
 333 #endif
 334 #ifndef O_BINARY
 335 # define O_BINARY 0
 336 #endif
 337
 338 /* Some systems define these in, e.g., param.h.  We undefine these names
 339    here to avoid the warnings.  We prefer to use our definitions since we
 340    know they are correct.  */
 341
 342 #undef MIN
 343 #undef MAX
 344 #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
 345 #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
 346
 347 /* Returns the least number N such that N * Y >= X.  */
 348 #define CEIL(x,y) (((x) + (y) - 1) / (y))
 349
 350 #ifdef HAVE_SYS_WAIT_H
 351 #include <sys/wait.h>
 352 #endif
 353
 354 #ifndef WIFSIGNALED
 355 #define WIFSIGNALED(S) (((S) & 0xff) != 0 && ((S) & 0xff) != 0x7f)
 356 #endif
 357 #ifndef WTERMSIG
 358 #define WTERMSIG(S) ((S) & 0x7f)
 359 #endif
 360 #ifndef WIFEXITED
 361 #define WIFEXITED(S) (((S) & 0xff) == 0)
 362 #endif
 363 #ifndef WEXITSTATUS
 364 #define WEXITSTATUS(S) (((S) & 0xff00) >> 8)
 365 #endif
 366 #ifndef WSTOPSIG
 367 #define WSTOPSIG WEXITSTATUS
 368 #endif
 369 #ifndef WCOREDUMP
 370 #define WCOREDUMP(S) ((S) & WCOREFLG)
 371 #endif
 372 #ifndef WCOREFLG
 373 #define WCOREFLG 0200
 374 #endif
 375
 376 #include <signal.h>
 377 #if !defined (SIGCHLD) && defined (SIGCLD)
 378 # define SIGCHLD SIGCLD
 379 #endif
 380
 381 #ifdef HAVE_SYS_MMAN_H
 382 # include <sys/mman.h>
 383 #endif
 384
 385 #ifndef MAP_FAILED
 386 # define MAP_FAILED ((void *)-1)
 387 #endif
 388
 389 #if !defined (MAP_ANONYMOUS) && defined (MAP_ANON)
 390 # define MAP_ANONYMOUS MAP_ANON
 391 #endif
 392
 393 #ifdef HAVE_SYS_RESOURCE_H
 394 # include <sys/resource.h>
 395 #endif
 396
 397 #ifdef HAVE_SYS_TIMES_H
 398 # include <sys/times.h>
 399 #endif
 400
 401 /* The HAVE_DECL_* macros are three-state, undefined, 0 or 1.  If they
 402    are defined to 0 then we must provide the relevant declaration
 403    here.  These checks will be in the undefined state while configure
 404    is running so be careful to test "defined (HAVE_DECL_*)".  */
 405
 406 #ifdef __cplusplus
 407 extern "C" {
 408 #endif
 409
 410 #if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
 411 extern double atof (const char *);
 412 #endif
 413
 414 #if defined (HAVE_DECL_ATOL) && !HAVE_DECL_ATOL
 415 extern long atol (const char *);
 416 #endif
 417
 418 #if defined (HAVE_DECL_FREE) && !HAVE_DECL_FREE
 419 extern void free (void *);
 420 #endif
 421
 422 #if defined (HAVE_DECL_GETCWD) && !HAVE_DECL_GETCWD
 423 extern char *getcwd (char *, size_t);
 424 #endif
 425
 426 #if defined (HAVE_DECL_GETENV) && !HAVE_DECL_GETENV
 427 extern char *getenv (const char *);
 428 #endif
 429
 430 #if defined (HAVE_DECL_GETOPT) && !HAVE_DECL_GETOPT
 431 extern int getopt (int, char * const *, const char *);
 432 #endif
 433
 434 #if defined (HAVE_DECL_GETPAGESIZE) && !HAVE_DECL_GETPAGESIZE
 435 extern int getpagesize (void);
 436 #endif
 437
 438 #if defined (HAVE_DECL_GETWD) && !HAVE_DECL_GETWD
 439 extern char *getwd (char *);
 440 #endif
 441
 442 #if defined (HAVE_DECL_SBRK) && !HAVE_DECL_SBRK
 443 extern void *sbrk (int);
 444 #endif
 445
 446 #if defined (HAVE_DECL_STRSTR) && !HAVE_DECL_STRSTR
 447 extern char *strstr (const char *, const char *);
 448 #endif
 449
 450 #if defined (HAVE_DECL_STPCPY) && !HAVE_DECL_STPCPY
 451 extern char *stpcpy (char *, const char *);
 452 #endif
 453
 454 #ifdef __cplusplus
 455 }
 456 #endif
 457
 458 #ifdef HAVE_MALLOC_H
 459 #include <malloc.h>
 460 #endif
 461
 462 #ifdef __cplusplus
 463 extern "C" {
 464 #endif
 465
 466 #if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC
 467 extern void *malloc (size_t);
 468 #endif
 469
 470 #if defined (HAVE_DECL_CALLOC) && !HAVE_DECL_CALLOC
 471 extern void *calloc (size_t, size_t);
 472 #endif
 473
 474 #if defined (HAVE_DECL_REALLOC) && !HAVE_DECL_REALLOC
 475 extern void *realloc (void *, size_t);
 476 #endif
 477
 478 #ifdef __cplusplus
 479 }
 480 #endif
 481
 482 #ifdef HAVE_STDINT_H
 483 #include <stdint.h>
 484 #endif
 485
 486 #ifdef HAVE_INTTYPES_H
 487 #include <inttypes.h>
 488 #endif
 489
 490 #ifdef __cplusplus
 491 extern "C" {
 492 #endif
 493
 494 /* If the system doesn't provide strsignal, we get it defined in
 495    libiberty but no declaration is supplied.  */
 496 #if !defined (HAVE_STRSIGNAL) \
 497     || (defined (HAVE_DECL_STRSIGNAL) && !HAVE_DECL_STRSIGNAL)
 498 # ifndef strsignal
 499 extern const char *strsignal (int);
 500 # endif
 501 #endif
 502
 503 #ifdef HAVE_GETRLIMIT
 504 # if defined (HAVE_DECL_GETRLIMIT) && !HAVE_DECL_GETRLIMIT
 505 #  ifndef getrlimit
 506 struct rlimit;
 507 extern int getrlimit (int, struct rlimit *);
 508 #  endif
 509 # endif
 510 #endif
 511
 512 #ifdef HAVE_SETRLIMIT
 513 # if defined (HAVE_DECL_SETRLIMIT) && !HAVE_DECL_SETRLIMIT
 514 #  ifndef setrlimit
 515 struct rlimit;
 516 extern int setrlimit (int, const struct rlimit *);
 517 #  endif
 518 # endif
 519 #endif
 520
 521 #if defined (HAVE_DECL_ABORT) && !HAVE_DECL_ABORT
 522 extern void abort (void);
 523 #endif
 524
 525 #if defined (HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 526 extern int snprintf (char *, size_t, const char *, ...);
 527 #endif
 528
 529 #if defined (HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 530 extern int vsnprintf(char *, size_t, const char *, va_list);
 531 #endif
 532
 533 #ifdef __cplusplus
 534 }
 535 #endif
 536
 537 /* 1 if we have C99 designated initializers.  */
 538 #if !defined(HAVE_DESIGNATED_INITIALIZERS)
 539 #define HAVE_DESIGNATED_INITIALIZERS \
 540   (((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)) \
 541    && !defined(__cplusplus))
 542 #endif
 543
 544 #if !defined(HAVE_DESIGNATED_UNION_INITIALIZERS)
 545 #define HAVE_DESIGNATED_UNION_INITIALIZERS \
 546   (((GCC_VERSION >= 2007) || (__STDC_VERSION__ >= 199901L)) \
 547    && (!defined(__cplusplus) || (GCC_VERSION >= 4007)))
 548 #endif
 549
 550 #if HAVE_SYS_STAT_H
 551 # include <sys/stat.h>
 552 #endif
 553
 554 /* Test if something is a normal file.  */
 555 #ifndef S_ISREG
 556 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 557 #endif
 558
 559 /* Test if something is a directory.  */
 560 #ifndef S_ISDIR
 561 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 562 #endif
 563
 564 /* Test if something is a character special file.  */
 565 #ifndef S_ISCHR
 566 #define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
 567 #endif
 568
 569 /* Test if something is a block special file.  */
 570 #ifndef S_ISBLK
 571 #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
 572 #endif
 573
 574 /* Test if something is a socket.  */
 575 #ifndef S_ISSOCK
 576 # ifdef S_IFSOCK
 577 #   define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
 578 # else
 579 #   define S_ISSOCK(m) 0
 580 # endif
 581 #endif
 582
 583 /* Test if something is a FIFO.  */
 584 #ifndef S_ISFIFO
 585 # ifdef S_IFIFO
 586 #  define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
 587 # else
 588 #  define S_ISFIFO(m) 0
 589 # endif
 590 #endif
 591
 592 /* Define well known filenos if the system does not define them.  */
 593 #ifndef STDIN_FILENO
 594 # define STDIN_FILENO   0
 595 #endif
 596 #ifndef STDOUT_FILENO
 597 # define STDOUT_FILENO  1
 598 #endif
 599 #ifndef STDERR_FILENO
 600 # define STDERR_FILENO  2
 601 #endif
 602
 603 /* Some systems have mkdir that takes a single argument.  */
 604 #ifdef MKDIR_TAKES_ONE_ARG
 605 # define mkdir(a,b) mkdir(a)
 606 #endif
 607
 608 #ifndef HAVE_KILL
 609 # define kill(p,s) raise(s)
 610 #endif
 611
 612 /* Provide a way to print an address via printf.  */
 613 #ifndef HOST_PTR_PRINTF
 614 #define HOST_PTR_PRINTF "%p"
 615 #endif /* ! HOST_PTR_PRINTF */
 616
 617 /* By default, colon separates directories in a path.  */
 618 #ifndef PATH_SEPARATOR
 619 #define PATH_SEPARATOR ':'
 620 #endif
 621
 622 /* Filename handling macros.  */
 623 #include "filenames.h"
 624
 625 /* These should be phased out in favor of IS_DIR_SEPARATOR, where possible.  */
 626 #ifndef DIR_SEPARATOR
 627 # define DIR_SEPARATOR '/'
 628 # ifdef HAVE_DOS_BASED_FILE_SYSTEM
 629 #  define DIR_SEPARATOR_2 '\\'
 630 # endif
 631 #endif
 632
 633 #if defined (ENABLE_PLUGIN) && defined (HAVE_DLFCN_H)
 634 /* If plugin support is enabled, we could use libdl.  */
 635 #include <dlfcn.h>
 636 #endif
 637
 638 /* Get libiberty declarations.  */
 639 #include "libiberty.h"
 640
 641 #undef FFS  /* Some systems predefine this symbol; don't let it interfere.  */
 642 #undef FLOAT /* Likewise.  */
 643 #undef ABS /* Likewise.  */
 644 #undef PC /* Likewise.  */
 645
 646 /* Provide a default for the HOST_BIT_BUCKET.
 647    This suffices for POSIX-like hosts.  */
 648
 649 #ifndef HOST_BIT_BUCKET
 650 #define HOST_BIT_BUCKET "/dev/null"
 651 #endif
 652
 653 #ifndef offsetof
 654 #define offsetof(TYPE, MEMBER)  ((size_t) &((TYPE *) 0)->MEMBER)
 655 #endif
 656
 657 /* Various error reporting routines want to use __FUNCTION__.  */
 658 #if (GCC_VERSION < 2007)
 659 #ifndef __FUNCTION__
 660 #define __FUNCTION__ "?"
 661 #endif /* ! __FUNCTION__ */
 662 #endif
 663
 664 /* __builtin_expect(A, B) evaluates to A, but notifies the compiler that
 665    the most likely value of A is B.  This feature was added at some point
 666    between 2.95 and 3.0.  Let's use 3.0 as the lower bound for now.  */
 667 #if (GCC_VERSION < 3000)
 668 #define __builtin_expect(a, b) (a)
 669 #endif
 670
 671 /* Redefine abort to report an internal error w/o coredump, and
 672    reporting the location of the error in the source file.  */
 673 extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 674 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
 675
 676 /* Use gcc_assert(EXPR) to test invariants.  */
 677 #if ENABLE_ASSERT_CHECKING
 678 #define gcc_assert(EXPR)                                                \
 679    ((void)(!(EXPR) ? fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0 : 0))
 680 #elif (GCC_VERSION >= 4005)
 681 #define gcc_assert(EXPR)                                                \
 682   ((void)(__builtin_expect(!(EXPR), 0) ? __builtin_unreachable(), 0 : 0))
 683 #else
 684 /* Include EXPR, so that unused variable warnings do not occur.  */
 685 #define gcc_assert(EXPR) ((void)(0 && (EXPR)))
 686 #endif
 687
 688 #ifdef ENABLE_CHECKING
 689 #define gcc_checking_assert(EXPR) gcc_assert (EXPR)
 690 #else
 691 #define gcc_checking_assert(EXPR) ((void)(0 && (EXPR)))
 692 #endif
 693
 694 /* Use gcc_unreachable() to mark unreachable locations (like an
 695    unreachable default case of a switch.  Do not use gcc_assert(0).  */
 696 #if (GCC_VERSION >= 4005) && !ENABLE_ASSERT_CHECKING
 697 #define gcc_unreachable() __builtin_unreachable()
 698 #else
 699 #define gcc_unreachable() (fancy_abort (__FILE__, __LINE__, __FUNCTION__))
 700 #endif
 701
 702 /* Provide a fake boolean type.  We make no attempt to use the
 703    C99 _Bool, as it may not be available in the bootstrap compiler,
 704    and even if it is, it is liable to be buggy.
 705    This must be after all inclusion of system headers, as some of
 706    them will mess us up.  */
 707
 708 #undef TRUE
 709 #undef FALSE
 710
 711 #ifdef __cplusplus
 712   /* Obsolete.  */
 713 # define TRUE true
 714 # define FALSE false
 715 #else /* !__cplusplus */
 716 # undef bool
 717 # undef true
 718 # undef false
 719
 720 # define bool unsigned char
 721 # define true 1
 722 # define false 0
 723
 724   /* Obsolete.  */
 725 # define TRUE true
 726 # define FALSE false
 727 #endif /* !__cplusplus */
 728
 729 /* Some compilers do not allow the use of unsigned char in bitfields.  */
 730 #define BOOL_BITFIELD unsigned int
 731
 732 /* As the last action in this file, we poison the identifiers that
 733    shouldn't be used.  Note, luckily gcc-3.0's token-based integrated
 734    preprocessor won't trip on poisoned identifiers that arrive from
 735    the expansion of macros.  E.g. #define strrchr rindex, won't error
 736    if rindex is poisoned after this directive is issued and later on
 737    strrchr is called.
 738
 739    Note: We define bypass macros for the few cases where we really
 740    want to use the libc memory allocation routines.  Otherwise we
 741    insist you use the "x" versions from libiberty.  */
 742
 743 #define really_call_malloc malloc
 744 #define really_call_calloc calloc
 745 #define really_call_realloc realloc
 746
 747 #if defined(FLEX_SCANNER) || defined(YYBISON) || defined(YYBYACC)
 748 /* Flex and bison use malloc and realloc.  Yuk.  Note that this means
 749    really_call_* cannot be used in a .l or .y file.  */
 750 #define malloc xmalloc
 751 #define realloc xrealloc
 752 #endif
 753
 754 #if (GCC_VERSION >= 3000)
 755
 756 /* Note autoconf checks for prototype declarations and includes
 757    system.h while doing so.  Only poison these tokens if actually
 758    compiling gcc, so that the autoconf declaration tests for malloc
 759    etc don't spuriously fail.  */
 760 #ifdef IN_GCC
 761 #undef calloc
 762 #undef strdup
 763  #pragma GCC poison calloc strdup
 764
 765 #if !defined(FLEX_SCANNER) && !defined(YYBISON)
 766 #undef malloc
 767 #undef realloc
 768  #pragma GCC poison malloc realloc
 769 #endif
 770
 771 /* The %m format should be used when GCC's main diagnostic functions
 772    supporting %m are available, and xstrerror from libiberty
 773    otherwise.  */
 774 #undef strerror
 775  #pragma GCC poison strerror
 776
 777 /* Old target macros that have moved to the target hooks structure.  */
 778  #pragma GCC poison ASM_OPEN_PAREN ASM_CLOSE_PAREN                      \
 779         FUNCTION_PROLOGUE FUNCTION_EPILOGUE                             \
 780         FUNCTION_END_PROLOGUE FUNCTION_BEGIN_EPILOGUE                   \
 781         DECL_MACHINE_ATTRIBUTES COMP_TYPE_ATTRIBUTES INSERT_ATTRIBUTES  \
 782         VALID_MACHINE_DECL_ATTRIBUTE VALID_MACHINE_TYPE_ATTRIBUTE       \
 783         SET_DEFAULT_TYPE_ATTRIBUTES SET_DEFAULT_DECL_ATTRIBUTES         \
 784         MERGE_MACHINE_TYPE_ATTRIBUTES MERGE_MACHINE_DECL_ATTRIBUTES     \
 785         MD_INIT_BUILTINS MD_EXPAND_BUILTIN ASM_OUTPUT_CONSTRUCTOR       \
 786         ASM_OUTPUT_DESTRUCTOR SIGNED_CHAR_SPEC MAX_CHAR_TYPE_SIZE       \
 787         WCHAR_UNSIGNED UNIQUE_SECTION SELECT_SECTION SELECT_RTX_SECTION \
 788         ENCODE_SECTION_INFO STRIP_NAME_ENCODING ASM_GLOBALIZE_LABEL     \
 789         ASM_OUTPUT_MI_THUNK CONST_COSTS RTX_COSTS DEFAULT_RTX_COSTS     \
 790         ADDRESS_COST MACHINE_DEPENDENT_REORG ASM_FILE_START ASM_FILE_END \
 791         ASM_SIMPLIFY_DWARF_ADDR INIT_TARGET_OPTABS INIT_SUBTARGET_OPTABS \
 792         INIT_GOFAST_OPTABS MULSI3_LIBCALL MULDI3_LIBCALL DIVSI3_LIBCALL \
 793         DIVDI3_LIBCALL UDIVSI3_LIBCALL UDIVDI3_LIBCALL MODSI3_LIBCALL   \
 794         MODDI3_LIBCALL UMODSI3_LIBCALL UMODDI3_LIBCALL BUILD_VA_LIST_TYPE \
 795         PRETEND_OUTGOING_VARARGS_NAMED STRUCT_VALUE_INCOMING_REGNUM     \
 796         ASM_OUTPUT_SECTION_NAME PROMOTE_FUNCTION_ARGS PROMOTE_FUNCTION_MODE \
 797         STRUCT_VALUE_INCOMING STRICT_ARGUMENT_NAMING                    \
 798         PROMOTE_FUNCTION_RETURN PROMOTE_PROTOTYPES STRUCT_VALUE_REGNUM  \
 799         SETUP_INCOMING_VARARGS EXPAND_BUILTIN_SAVEREGS                  \
 800         DEFAULT_SHORT_ENUMS SPLIT_COMPLEX_ARGS MD_ASM_CLOBBERS          \
 801         HANDLE_PRAGMA_REDEFINE_EXTNAME HANDLE_PRAGMA_EXTERN_PREFIX      \
 802         MUST_PASS_IN_STACK FUNCTION_ARG_PASS_BY_REFERENCE               \
 803         VECTOR_MODE_SUPPORTED_P TARGET_SUPPORTS_HIDDEN                  \
 804         FUNCTION_ARG_PARTIAL_NREGS ASM_OUTPUT_DWARF_DTPREL              \
 805         ALLOCATE_INITIAL_VALUE LEGITIMIZE_ADDRESS FRAME_POINTER_REQUIRED \
 806         CAN_ELIMINATE TRAMPOLINE_TEMPLATE INITIALIZE_TRAMPOLINE         \
 807         TRAMPOLINE_ADJUST_ADDRESS STATIC_CHAIN STATIC_CHAIN_INCOMING    \
 808         RETURN_POPS_ARGS UNITS_PER_SIMD_WORD OVERRIDE_OPTIONS           \
 809         OPTIMIZATION_OPTIONS CLASS_LIKELY_SPILLED_P                     \
 810         USING_SJLJ_EXCEPTIONS TARGET_UNWIND_INFO                        \
 811         LABEL_ALIGN_MAX_SKIP LOOP_ALIGN_MAX_SKIP                        \
 812         LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP JUMP_ALIGN_MAX_SKIP          \
 813         CAN_DEBUG_WITHOUT_FP UNLIKELY_EXECUTED_TEXT_SECTION_NAME        \
 814         HOT_TEXT_SECTION_NAME LEGITIMATE_CONSTANT_P ALWAYS_STRIP_DOTDOT \
 815         OUTPUT_ADDR_CONST_EXTRA SMALL_REGISTER_CLASSES ASM_OUTPUT_IDENT \
 816         ASM_BYTE_OP MEMBER_TYPE_FORCES_BLK
 817
 818 /* Target macros only used for code built for the target, that have
 819    moved to libgcc-tm.h or have never been present elsewhere.  */
 820  #pragma GCC poison DECLARE_LIBRARY_RENAMES LIBGCC2_GNU_PREFIX          \
 821         MD_UNWIND_SUPPORT MD_FROB_UPDATE_CONTEXT ENABLE_EXECUTE_STACK   \
 822         REG_VALUE_IN_UNWIND_CONTEXT ASSUME_EXTENDED_UNWIND_CONTEXT
 823
 824 /* Other obsolete target macros, or macros that used to be in target
 825    headers and were not used, and may be obsolete or may never have
 826    been used.  */
 827  #pragma GCC poison INT_ASM_OP ASM_OUTPUT_EH_REGION_BEG CPP_PREDEFINES     \
 828         ASM_OUTPUT_EH_REGION_END ASM_OUTPUT_LABELREF_AS_INT SMALL_STACK    \
 829         DOESNT_NEED_UNWINDER EH_TABLE_LOOKUP OBJC_SELECTORS_WITHOUT_LABELS \
 830         OMIT_EH_TABLE EASY_DIV_EXPR IMPLICIT_FIX_EXPR                      \
 831         LONGJMP_RESTORE_FROM_STACK MAX_INT_TYPE_SIZE ASM_IDENTIFY_GCC      \
 832         STDC_VALUE TRAMPOLINE_ALIGN ASM_IDENTIFY_GCC_AFTER_SOURCE          \
 833         SLOW_ZERO_EXTEND SUBREG_REGNO_OFFSET DWARF_LINE_MIN_INSTR_LENGTH   \
 834         TRADITIONAL_RETURN_FLOAT NO_BUILTIN_SIZE_TYPE                      \
 835         NO_BUILTIN_PTRDIFF_TYPE NO_BUILTIN_WCHAR_TYPE NO_BUILTIN_WINT_TYPE \
 836         BLOCK_PROFILER BLOCK_PROFILER_CODE FUNCTION_BLOCK_PROFILER         \
 837         FUNCTION_BLOCK_PROFILER_EXIT MACHINE_STATE_SAVE                    \
 838         MACHINE_STATE_RESTORE SCCS_DIRECTIVE SECTION_ASM_OP BYTEORDER      \
 839         ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL HOST_WORDS_BIG_ENDIAN    \
 840         OBJC_PROLOGUE ALLOCATE_TRAMPOLINE HANDLE_PRAGMA ROUND_TYPE_SIZE    \
 841         ROUND_TYPE_SIZE_UNIT CONST_SECTION_ASM_OP CRT_GET_RFIB_TEXT        \
 842         DBX_LBRAC_FIRST DBX_OUTPUT_ENUM DBX_OUTPUT_SOURCE_FILENAME         \
 843         DBX_WORKING_DIRECTORY INSN_CACHE_DEPTH INSN_CACHE_SIZE             \
 844         INSN_CACHE_LINE_WIDTH INIT_SECTION_PREAMBLE NEED_ATEXIT ON_EXIT    \
 845         EXIT_BODY OBJECT_FORMAT_ROSE MULTIBYTE_CHARS MAP_CHARACTER         \
 846         LIBGCC_NEEDS_DOUBLE FINAL_PRESCAN_LABEL DEFAULT_CALLER_SAVES       \
 847         LOAD_ARGS_REVERSED MAX_INTEGER_COMPUTATION_MODE                    \
 848         CONVERT_HARD_REGISTER_TO_SSA_P ASM_OUTPUT_MAIN_SOURCE_FILENAME     \
 849         FIRST_INSN_ADDRESS TEXT_SECTION SHARED_BSS_SECTION_ASM_OP          \
 850         PROMOTED_MODE EXPAND_BUILTIN_VA_END                                \
 851         LINKER_DOES_NOT_WORK_WITH_DWARF2 FUNCTION_ARG_KEEP_AS_REFERENCE    \
 852         GIV_SORT_CRITERION MAX_LONG_TYPE_SIZE MAX_LONG_DOUBLE_TYPE_SIZE    \
 853         MAX_WCHAR_TYPE_SIZE SHARED_SECTION_ASM_OP INTEGRATE_THRESHOLD      \
 854         FINAL_REG_PARM_STACK_SPACE MAYBE_REG_PARM_STACK_SPACE              \
 855         TRADITIONAL_PIPELINE_INTERFACE DFA_PIPELINE_INTERFACE              \
 856         DBX_OUTPUT_STANDARD_TYPES BUILTIN_SETJMP_FRAME_VALUE               \
 857         SUNOS4_SHARED_LIBRARIES PROMOTE_FOR_CALL_ONLY                      \
 858         SPACE_AFTER_L_OPTION NO_RECURSIVE_FUNCTION_CSE                     \
 859         DEFAULT_MAIN_RETURN TARGET_MEM_FUNCTIONS EXPAND_BUILTIN_VA_ARG     \
 860         COLLECT_PARSE_FLAG DWARF2_GENERATE_TEXT_SECTION_LABEL WINNING_GDB  \
 861         ASM_OUTPUT_FILENAME ASM_OUTPUT_SOURCE_LINE FILE_NAME_JOINER        \
 862         GDB_INV_REF_REGPARM_STABS_LETTER DBX_MEMPARM_STABS_LETTER          \
 863         PUT_SDB_SRC_FILE STABS_GCC_MARKER DBX_OUTPUT_FUNCTION_END          \
 864         DBX_OUTPUT_GCC_MARKER DBX_FINISH_SYMBOL SDB_GENERATE_FAKE          \
 865         NON_SAVING_SETJMP TARGET_LATE_RTL_PROLOGUE_EPILOGUE                \
 866         CASE_DROPS_THROUGH TARGET_BELL TARGET_BS TARGET_CR TARGET_DIGIT0   \
 867         TARGET_ESC TARGET_FF TARGET_NEWLINE TARGET_TAB TARGET_VT           \
 868         LINK_LIBGCC_SPECIAL DONT_ACCESS_GBLS_AFTER_EPILOGUE                \
 869         TARGET_OPTIONS TARGET_SWITCHES EXTRA_CC_MODES FINALIZE_PIC         \
 870         PREDICATE_CODES SPECIAL_MODE_PREDICATES UNALIGNED_WORD_ASM_OP      \
 871         EXTRA_SECTIONS EXTRA_SECTION_FUNCTIONS READONLY_DATA_SECTION       \
 872         TARGET_ASM_EXCEPTION_SECTION TARGET_ASM_EH_FRAME_SECTION           \
 873         SMALL_ARG_MAX ASM_OUTPUT_SHARED_BSS ASM_OUTPUT_SHARED_COMMON       \
 874         ASM_OUTPUT_SHARED_LOCAL ASM_MAKE_LABEL_LINKONCE                    \
 875         STACK_CHECK_PROBE_INTERVAL STACK_CHECK_PROBE_LOAD                  \
 876         ORDER_REGS_FOR_LOCAL_ALLOC FUNCTION_OUTGOING_VALUE                 \
 877         ASM_DECLARE_CONSTANT_NAME MODIFY_TARGET_NAME SWITCHES_NEED_SPACES  \
 878         SWITCH_CURTAILS_COMPILATION SWITCH_TAKES_ARG WORD_SWITCH_TAKES_ARG \
 879         TARGET_OPTION_TRANSLATE_TABLE HANDLE_PRAGMA_PACK_PUSH_POP          \
 880         HANDLE_SYSV_PRAGMA HANDLE_PRAGMA_WEAK CONDITIONAL_REGISTER_USAGE   \
 881         FUNCTION_ARG_BOUNDARY MUST_USE_SJLJ_EXCEPTIONS US_SOFTWARE_GOFAST  \
 882         USING_SVR4_H SVR4_ASM_SPEC FUNCTION_ARG FUNCTION_ARG_ADVANCE       \
 883         FUNCTION_INCOMING_ARG IRA_COVER_CLASSES TARGET_VERSION             \
 884         MACHINE_TYPE TARGET_HAS_TARGETCM ASM_OUTPUT_BSS                    \
 885         SETJMP_VIA_SAVE_AREA FORBIDDEN_INC_DEC_CLASSES                     \
 886         PREFERRED_OUTPUT_RELOAD_CLASS SYSTEM_INCLUDE_DIR                   \
 887         STANDARD_INCLUDE_DIR STANDARD_INCLUDE_COMPONENT                    \
 888         LINK_ELIMINATE_DUPLICATE_LDIRECTORIES MIPS_DEBUGGING_INFO          \
 889         IDENT_ASM_OP ALL_COP_ADDITIONAL_REGISTER_NAMES DBX_OUTPUT_LBRAC    \
 890         DBX_OUTPUT_NFUN DBX_OUTPUT_RBRAC RANGE_TEST_NON_SHORT_CIRCUIT      \
 891         REAL_VALUE_TRUNCATE REVERSE_CONDEXEC_PREDICATES_P                  \
 892         TARGET_ALIGN_ANON_BITFIELDS TARGET_NARROW_VOLATILE_BITFIELDS       \
 893         IDENT_ASM_OP UNALIGNED_SHORT_ASM_OP UNALIGNED_INT_ASM_OP           \
 894         UNALIGNED_LONG_ASM_OP UNALIGNED_DOUBLE_INT_ASM_OP                  \
 895         USE_COMMON_FOR_ONE_ONLY IFCVT_EXTRA_FIELDS IFCVT_INIT_EXTRA_FIELDS \
 896         CASE_USE_BIT_TESTS FIXUNS_TRUNC_LIKE_FIX_TRUNC                     \
 897         GO_IF_MODE_DEPENDENT_ADDRESS
 898
 899 /* Hooks that are no longer used.  */
 900  #pragma GCC poison LANG_HOOKS_FUNCTION_MARK LANG_HOOKS_FUNCTION_FREE   \
 901         LANG_HOOKS_MARK_TREE LANG_HOOKS_INSERT_DEFAULT_ATTRIBUTES \
 902         LANG_HOOKS_TREE_INLINING_ESTIMATE_NUM_INSNS \
 903         LANG_HOOKS_PUSHLEVEL LANG_HOOKS_SET_BLOCK \
 904         LANG_HOOKS_MAYBE_BUILD_CLEANUP LANG_HOOKS_UPDATE_DECL_AFTER_SAVING \
 905         LANG_HOOKS_POPLEVEL LANG_HOOKS_TRUTHVALUE_CONVERSION \
 906         TARGET_PROMOTE_FUNCTION_ARGS TARGET_PROMOTE_FUNCTION_RETURN \
 907         LANG_HOOKS_MISSING_ARGUMENT LANG_HOOKS_HASH_TYPES \
 908         TARGET_HANDLE_OFAST TARGET_OPTION_OPTIMIZATION \
 909         TARGET_IRA_COVER_CLASSES TARGET_HELP \
 910         TARGET_HANDLE_PRAGMA_EXTERN_PREFIX \
 911         TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN \
 912         TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD \
 913
 914 /* Arrays that were deleted in favor of a functional interface.  */
 915  #pragma GCC poison built_in_decls implicit_built_in_decls
 916
 917 /* Hooks into libgcc2.  */
 918  #pragma GCC poison LIBGCC2_DOUBLE_TYPE_SIZE LIBGCC2_WORDS_BIG_ENDIAN \
 919    LIBGCC2_FLOAT_WORDS_BIG_ENDIAN
 920
 921 /* Miscellaneous macros that are no longer used.  */
 922  #pragma GCC poison USE_MAPPED_LOCATION GET_ENVIRONMENT
 923
 924 /* Libiberty macros that are no longer used in GCC.  */
 925 #undef ANSI_PROTOTYPES
 926 #undef PTR_CONST
 927 #undef LONG_DOUBLE
 928 #undef VPARAMS
 929 #undef VA_OPEN
 930 #undef VA_FIXEDARG
 931 #undef VA_CLOSE
 932 #undef VA_START
 933  #pragma GCC poison ANSI_PROTOTYPES PTR_CONST LONG_DOUBLE VPARAMS VA_OPEN \
 934   VA_FIXEDARG VA_CLOSE VA_START
 935 #endif /* IN_GCC */
 936
 937 /* Front ends should never have to include middle-end headers.  Enforce
 938    this by poisoning the header double-include protection defines.  */
 939 #ifdef IN_GCC_FRONTEND
 940 #pragma GCC poison GCC_RTL_H GCC_EXCEPT_H GCC_EXPR_H
 941 #endif
 942
 943 /* Note: not all uses of the `index' token (e.g. variable names and
 944    structure members) have been eliminated.  */
 945 #undef bcopy
 946 #undef bzero
 947 #undef bcmp
 948 #undef rindex
 949  #pragma GCC poison bcopy bzero bcmp rindex
 950
 951 #endif /* GCC >= 3.0 */
 952
 953 /* This macro allows casting away const-ness to pass -Wcast-qual
 954    warnings.  DO NOT USE THIS UNLESS YOU REALLY HAVE TO!  It should
 955    only be used in certain specific cases.  One valid case is where
 956    the C standard definitions or prototypes force you to.  E.g. if you
 957    need to free a const object, or if you pass a const string to
 958    execv, et al.  Another valid use would be in an allocation function
 959    that creates const objects that need to be initialized.  In some
 960    cases we have non-const functions that return the argument
 961    (e.g. next_nonnote_insn).  Rather than create const shadow
 962    functions, we can cast away const-ness in calling these interfaces
 963    if we're careful to verify that the called function does indeed not
 964    modify its argument and the return value is only used in a const
 965    context.  (This can be somewhat dangerous as these assumptions can
 966    change after the fact).  Beyond these uses, most other cases of
 967    using this macro should be viewed with extreme caution.  */
 968
 969 #ifdef __cplusplus
 970 #define CONST_CAST2(TOTYPE,FROMTYPE,X) (const_cast<TOTYPE> (X))
 971 #else
 972 #if defined(__GNUC__) && GCC_VERSION > 4000
 973 /* GCC 4.0.x has a bug where it may ICE on this expression,
 974    so does GCC 3.4.x (PR17436).  */
 975 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
 976 #elif defined(__GNUC__)
 977 static inline char *
 978 helper_const_non_const_cast (const char *p)
 979 {
 980   union {
 981     const char *const_c;
 982     char *c;
 983   } val;
 984   val.const_c = p;
 985   return val.c;
 986 }
 987
 988 #define CONST_CAST2(TOTYPE,FROMTYPE,X) \
 989         ((TOTYPE) helper_const_non_const_cast ((const char *) (FROMTYPE) (X)))
 990 #else
 991 #define CONST_CAST2(TOTYPE,FROMTYPE,X) ((TOTYPE)(FROMTYPE)(X))
 992 #endif
 993 #endif
 994 #define CONST_CAST(TYPE,X) CONST_CAST2(TYPE, const TYPE, (X))
 995 #define CONST_CAST_TREE(X) CONST_CAST(union tree_node *, (X))
 996 #define CONST_CAST_RTX(X) CONST_CAST(struct rtx_def *, (X))
 997 #define CONST_CAST_BB(X) CONST_CAST(struct basic_block_def *, (X))
 998 #define CONST_CAST_GIMPLE(X) CONST_CAST(union gimple_statement_d *, (X))
 999
1000 /* Activate certain diagnostics as warnings (not errors via the
1001    -Werror flag).  */
1002 #if GCC_VERSION >= 4003
1003 /* If asserts are disabled, activate -Wuninitialized as a warning (not
1004    an error/-Werror).  */
1005 #ifndef ENABLE_ASSERT_CHECKING
1006 #pragma GCC diagnostic warning "-Wuninitialized"
1007 #endif
1008 #endif
1009
1010 #ifdef ENABLE_VALGRIND_CHECKING
1011 # ifdef HAVE_VALGRIND_MEMCHECK_H
1012 #  include <valgrind/memcheck.h>
1013 # elif defined HAVE_MEMCHECK_H
1014 #  include <memcheck.h>
1015 # else
1016 #  include <valgrind.h>
1017 # endif
1018 /* Compatibility macros to let valgrind 3.1 work.  */
1019 # ifndef VALGRIND_MAKE_MEM_NOACCESS
1020 #  define VALGRIND_MAKE_MEM_NOACCESS VALGRIND_MAKE_NOACCESS
1021 # endif
1022 # ifndef VALGRIND_MAKE_MEM_DEFINED
1023 #  define VALGRIND_MAKE_MEM_DEFINED VALGRIND_MAKE_READABLE
1024 # endif
1025 # ifndef VALGRIND_MAKE_MEM_UNDEFINED
1026 #  define VALGRIND_MAKE_MEM_UNDEFINED VALGRIND_MAKE_WRITABLE
1027 # endif
1028 #else
1029 /* Avoid #ifdef:s when we can help it.  */
1030 #define VALGRIND_DISCARD(x)
1031 #define VALGRIND_MALLOCLIKE_BLOCK(w,x,y,z)
1032 #define VALGRIND_FREELIKE_BLOCK(x,y)
1033 #endif
1034
1035 /* In LTO -fwhole-program build we still want to keep the debug functions available
1036    for debugger.  Mark them as used to prevent removal.  */
1037 #if (GCC_VERSION > 4000)
1038 #define DEBUG_FUNCTION __attribute__ ((__used__))
1039 #define DEBUG_VARIABLE __attribute__ ((__used__))
1040 #else
1041 #define DEBUG_FUNCTION
1042 #define DEBUG_VARIABLE
1043 #endif
1044
1045 #endif /* ! GCC_SYSTEM_H */