gcc/cppinit.c

   1 /* CPP Library.
   2    Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   4    Contributed by Per Bothner, 1994-95.
   5    Based on CCCP program by Paul Rubin, June 1986
   6    Adapted to ANSI C, Richard Stallman, Jan 1987
   7
   8 This program is free software; you can redistribute it and/or modify it
   9 under the terms of the GNU General Public License as published by the
  10 Free Software Foundation; either version 2, or (at your option) any
  11 later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "cpplib.h"
  25 #include "cpphash.h"
  26 #include "mkdeps.h"
  27
  28 static void init_library (void);
  29 static void mark_named_operators (cpp_reader *);
  30 static void read_original_filename (cpp_reader *);
  31 static void read_original_directory (cpp_reader *);
  32 static void post_options (cpp_reader *);
  33
  34 /* If we have designated initializers (GCC >2.7) these tables can be
  35    initialized, constant data.  Otherwise, they have to be filled in at
  36    runtime.  */
  37 #if HAVE_DESIGNATED_INITIALIZERS
  38
  39 #define init_trigraph_map()  /* Nothing.  */
  40 #define TRIGRAPH_MAP \
  41 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
  42
  43 #define END };
  44 #define s(p, v) [p] = v,
  45
  46 #else
  47
  48 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
  49  static void init_trigraph_map (void) { \
  50  unsigned char *x = _cpp_trigraph_map;
  51
  52 #define END }
  53 #define s(p, v) x[p] = v;
  54
  55 #endif
  56
  57 TRIGRAPH_MAP
  58   s('=', '#')   s(')', ']')     s('!', '|')
  59   s('(', '[')   s('\'', '^')    s('>', '}')
  60   s('/', '\\')  s('<', '{')     s('-', '~')
  61 END
  62
  63 #undef s
  64 #undef END
  65 #undef TRIGRAPH_MAP
  66
  67 /* A set of booleans indicating what CPP features each source language
  68    requires.  */
  69 struct lang_flags
  70 {
  71   char c99;
  72   char cplusplus;
  73   char extended_numbers;
  74   char std;
  75   char cplusplus_comments;
  76   char digraphs;
  77 };
  78
  79 static const struct lang_flags lang_defaults[] =
  80 { /*              c99 c++ xnum std  //   digr  */
  81   /* GNUC89 */  { 0,  0,  1,   0,   1,   1     },
  82   /* GNUC99 */  { 1,  0,  1,   0,   1,   1     },
  83   /* STDC89 */  { 0,  0,  0,   1,   0,   0     },
  84   /* STDC94 */  { 0,  0,  0,   1,   0,   1     },
  85   /* STDC99 */  { 1,  0,  1,   1,   1,   1     },
  86   /* GNUCXX */  { 0,  1,  1,   0,   1,   1     },
  87   /* CXX98  */  { 0,  1,  1,   1,   1,   1     },
  88   /* ASM    */  { 0,  0,  1,   0,   1,   0     }
  89 };
  90
  91 /* Sets internal flags correctly for a given language.  */
  92 void
  93 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
  94 {
  95   const struct lang_flags *l = &lang_defaults[(int) lang];
  96
  97   CPP_OPTION (pfile, lang) = lang;
  98
  99   CPP_OPTION (pfile, c99)                = l->c99;
 100   CPP_OPTION (pfile, cplusplus)          = l->cplusplus;
 101   CPP_OPTION (pfile, extended_numbers)   = l->extended_numbers;
 102   CPP_OPTION (pfile, std)                = l->std;
 103   CPP_OPTION (pfile, trigraphs)          = l->std;
 104   CPP_OPTION (pfile, cplusplus_comments) = l->cplusplus_comments;
 105   CPP_OPTION (pfile, digraphs)           = l->digraphs;
 106 }
 107
 108 /* Initialize library global state.  */
 109 static void
 110 init_library (void)
 111 {
 112   static int initialized = 0;
 113
 114   if (! initialized)
 115     {
 116       initialized = 1;
 117
 118       /* Set up the trigraph map.  This doesn't need to do anything if
 119          we were compiled with a compiler that supports C99 designated
 120          initializers.  */
 121       init_trigraph_map ();
 122     }
 123 }
 124
 125 /* Initialize a cpp_reader structure.  */
 126 cpp_reader *
 127 cpp_create_reader (enum c_lang lang, hash_table *table,
 128                    struct line_maps *line_table)
 129 {
 130   cpp_reader *pfile;
 131
 132   /* Initialize this instance of the library if it hasn't been already.  */
 133   init_library ();
 134
 135   pfile = xcalloc (1, sizeof (cpp_reader));
 136
 137   cpp_set_lang (pfile, lang);
 138   CPP_OPTION (pfile, warn_multichar) = 1;
 139   CPP_OPTION (pfile, discard_comments) = 1;
 140   CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
 141   CPP_OPTION (pfile, show_column) = 1;
 142   CPP_OPTION (pfile, tabstop) = 8;
 143   CPP_OPTION (pfile, operator_names) = 1;
 144   CPP_OPTION (pfile, warn_trigraphs) = 2;
 145   CPP_OPTION (pfile, warn_endif_labels) = 1;
 146   CPP_OPTION (pfile, warn_deprecated) = 1;
 147   CPP_OPTION (pfile, warn_long_long) = !CPP_OPTION (pfile, c99);
 148   CPP_OPTION (pfile, dollars_in_ident) = 1;
 149   CPP_OPTION (pfile, warn_dollars) = 1;
 150
 151   /* Default CPP arithmetic to something sensible for the host for the
 152      benefit of dumb users like fix-header.  */
 153   CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
 154   CPP_OPTION (pfile, char_precision) = CHAR_BIT;
 155   CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
 156   CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
 157   CPP_OPTION (pfile, unsigned_char) = 0;
 158   CPP_OPTION (pfile, unsigned_wchar) = 1;
 159   CPP_OPTION (pfile, bytes_big_endian) = 1;  /* does not matter */
 160
 161   /* Default to no charset conversion.  */
 162   CPP_OPTION (pfile, narrow_charset) = 0;
 163   CPP_OPTION (pfile, wide_charset) = 0;
 164
 165   /* Default the input character set to iso-8859-1 for now. */
 166   CPP_OPTION (pfile, input_charset) = "ISO-8859-1";
 167
 168   /* A fake empty "directory" used as the starting point for files
 169      looked up without a search path.  Name cannot be '/' because we
 170      don't want to prepend anything at all to filenames using it.  All
 171      other entries are correct zero-initialized.  */
 172   pfile->no_search_path.name = (char *) "";
 173
 174   /* Initialize the line map.  Start at logical line 1, so we can use
 175      a line number of zero for special states.  */
 176   pfile->line_table = line_table;
 177   pfile->line = 1;
 178
 179   /* Initialize lexer state.  */
 180   pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
 181
 182   /* Set up static tokens.  */
 183   pfile->avoid_paste.type = CPP_PADDING;
 184   pfile->avoid_paste.val.source = NULL;
 185   pfile->eof.type = CPP_EOF;
 186   pfile->eof.flags = 0;
 187
 188   /* Create a token buffer for the lexer.  */
 189   _cpp_init_tokenrun (&pfile->base_run, 250);
 190   pfile->cur_run = &pfile->base_run;
 191   pfile->cur_token = pfile->base_run.base;
 192
 193   /* Initialize the base context.  */
 194   pfile->context = &pfile->base_context;
 195   pfile->base_context.macro = 0;
 196   pfile->base_context.prev = pfile->base_context.next = 0;
 197
 198   /* Aligned and unaligned storage.  */
 199   pfile->a_buff = _cpp_get_buff (pfile, 0);
 200   pfile->u_buff = _cpp_get_buff (pfile, 0);
 201
 202   /* The expression parser stack.  */
 203   _cpp_expand_op_stack (pfile);
 204
 205   /* Initialize the buffer obstack.  */
 206   _obstack_begin (&pfile->buffer_ob, 0, 0,
 207                   (void *(*) (long)) xmalloc,
 208                   (void (*) (void *)) free);
 209
 210   _cpp_init_files (pfile);
 211
 212   _cpp_init_hashtable (pfile, table);
 213
 214   return pfile;
 215 }
 216
 217 /* Free resources used by PFILE.  Accessing PFILE after this function
 218    returns leads to undefined behavior.  Returns the error count.  */
 219 void
 220 cpp_destroy (cpp_reader *pfile)
 221 {
 222   cpp_context *context, *contextn;
 223   tokenrun *run, *runn;
 224
 225   free (pfile->op_stack);
 226
 227   while (CPP_BUFFER (pfile) != NULL)
 228     _cpp_pop_buffer (pfile);
 229
 230   if (pfile->out.base)
 231     free (pfile->out.base);
 232
 233   if (pfile->macro_buffer)
 234     {
 235       free (pfile->macro_buffer);
 236       pfile->macro_buffer = NULL;
 237       pfile->macro_buffer_len = 0;
 238     }
 239
 240   if (pfile->deps)
 241     deps_free (pfile->deps);
 242   obstack_free (&pfile->buffer_ob, 0);
 243
 244   _cpp_destroy_hashtable (pfile);
 245   _cpp_cleanup_files (pfile);
 246   _cpp_destroy_iconv (pfile);
 247
 248   _cpp_free_buff (pfile->a_buff);
 249   _cpp_free_buff (pfile->u_buff);
 250   _cpp_free_buff (pfile->free_buffs);
 251
 252   for (run = &pfile->base_run; run; run = runn)
 253     {
 254       runn = run->next;
 255       free (run->base);
 256       if (run != &pfile->base_run)
 257         free (run);
 258     }
 259
 260   for (context = pfile->base_context.next; context; context = contextn)
 261     {
 262       contextn = context->next;
 263       free (context);
 264     }
 265
 266   free (pfile);
 267 }
 268
 269 /* This structure defines one built-in identifier.  A node will be
 270    entered in the hash table under the name NAME, with value VALUE.
 271
 272    There are two tables of these.  builtin_array holds all the
 273    "builtin" macros: these are handled by builtin_macro() in
 274    cppmacro.c.  Builtin is somewhat of a misnomer -- the property of
 275    interest is that these macros require special code to compute their
 276    expansions.  The value is a "builtin_type" enumerator.
 277
 278    operator_array holds the C++ named operators.  These are keywords
 279    which act as aliases for punctuators.  In C++, they cannot be
 280    altered through #define, and #if recognizes them as operators.  In
 281    C, these are not entered into the hash table at all (but see
 282    <iso646.h>).  The value is a token-type enumerator.  */
 283 struct builtin
 284 {
 285   const uchar *name;
 286   unsigned short len;
 287   unsigned short value;
 288 };
 289
 290 #define B(n, t)    { DSC(n), t }
 291 static const struct builtin builtin_array[] =
 292 {
 293   B("__TIME__",          BT_TIME),
 294   B("__DATE__",          BT_DATE),
 295   B("__FILE__",          BT_FILE),
 296   B("__BASE_FILE__",     BT_BASE_FILE),
 297   B("__LINE__",          BT_SPECLINE),
 298   B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL),
 299   /* Keep builtins not used for -traditional-cpp at the end, and
 300      update init_builtins() if any more are added.  */
 301   B("_Pragma",           BT_PRAGMA),
 302   B("__STDC__",          BT_STDC),
 303 };
 304
 305 static const struct builtin operator_array[] =
 306 {
 307   B("and",      CPP_AND_AND),
 308   B("and_eq",   CPP_AND_EQ),
 309   B("bitand",   CPP_AND),
 310   B("bitor",    CPP_OR),
 311   B("compl",    CPP_COMPL),
 312   B("not",      CPP_NOT),
 313   B("not_eq",   CPP_NOT_EQ),
 314   B("or",       CPP_OR_OR),
 315   B("or_eq",    CPP_OR_EQ),
 316   B("xor",      CPP_XOR),
 317   B("xor_eq",   CPP_XOR_EQ)
 318 };
 319 #undef B
 320
 321 /* Mark the C++ named operators in the hash table.  */
 322 static void
 323 mark_named_operators (cpp_reader *pfile)
 324 {
 325   const struct builtin *b;
 326
 327   for (b = operator_array;
 328        b < (operator_array + ARRAY_SIZE (operator_array));
 329        b++)
 330     {
 331       cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
 332       hp->flags |= NODE_OPERATOR;
 333       hp->is_directive = 0;
 334       hp->directive_index = b->value;
 335     }
 336 }
 337
 338 /* Read the builtins table above and enter them, and language-specific
 339    macros, into the hash table.  HOSTED is true if this is a hosted
 340    environment.  */
 341 void
 342 cpp_init_builtins (cpp_reader *pfile, int hosted)
 343 {
 344   const struct builtin *b;
 345   size_t n = ARRAY_SIZE (builtin_array);
 346
 347   if (CPP_OPTION (pfile, traditional))
 348     n -= 2;
 349
 350   for(b = builtin_array; b < builtin_array + n; b++)
 351     {
 352       cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
 353       hp->type = NT_MACRO;
 354       hp->flags |= NODE_BUILTIN | NODE_WARN;
 355       hp->value.builtin = b->value;
 356     }
 357
 358   if (CPP_OPTION (pfile, cplusplus))
 359     _cpp_define_builtin (pfile, "__cplusplus 1");
 360   else if (CPP_OPTION (pfile, lang) == CLK_ASM)
 361     _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
 362   else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
 363     _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
 364   else if (CPP_OPTION (pfile, c99))
 365     _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
 366
 367   if (hosted)
 368     _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
 369   else
 370     _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
 371
 372   if (CPP_OPTION (pfile, objc))
 373     _cpp_define_builtin (pfile, "__OBJC__ 1");
 374 }
 375
 376 /* Sanity-checks are dependent on command-line options, so it is
 377    called as a subroutine of cpp_read_main_file ().  */
 378 #if ENABLE_CHECKING
 379 static void sanity_checks (cpp_reader *);
 380 static void sanity_checks (cpp_reader *pfile)
 381 {
 382   cppchar_t test = 0;
 383   size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
 384
 385   /* Sanity checks for assumptions about CPP arithmetic and target
 386      type precisions made by cpplib.  */
 387   test--;
 388   if (test < 1)
 389     cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
 390
 391   if (CPP_OPTION (pfile, precision) > max_precision)
 392     cpp_error (pfile, CPP_DL_ICE,
 393                "preprocessor arithmetic has maximum precision of %lu bits;"
 394                " target requires %lu bits",
 395                (unsigned long) max_precision,
 396                (unsigned long) CPP_OPTION (pfile, precision));
 397
 398   if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
 399     cpp_error (pfile, CPP_DL_ICE,
 400                "CPP arithmetic must be at least as precise as a target int");
 401
 402   if (CPP_OPTION (pfile, char_precision) < 8)
 403     cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
 404
 405   if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
 406     cpp_error (pfile, CPP_DL_ICE,
 407                "target wchar_t is narrower than target char");
 408
 409   if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
 410     cpp_error (pfile, CPP_DL_ICE,
 411                "target int is narrower than target char");
 412
 413   /* This is assumed in eval_token() and could be fixed if necessary.  */
 414   if (sizeof (cppchar_t) > sizeof (cpp_num_part))
 415     cpp_error (pfile, CPP_DL_ICE,
 416                "CPP half-integer narrower than CPP character");
 417
 418   if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
 419     cpp_error (pfile, CPP_DL_ICE,
 420                "CPP on this host cannot handle wide character constants over"
 421                " %lu bits, but the target requires %lu bits",
 422                (unsigned long) BITS_PER_CPPCHAR_T,
 423                (unsigned long) CPP_OPTION (pfile, wchar_precision));
 424 }
 425 #else
 426 # define sanity_checks(PFILE)
 427 #endif
 428
 429 /* Add a dependency target.  Can be called any number of times before
 430    cpp_read_main_file().  If no targets have been added before
 431    cpp_read_main_file(), then the default target is used.  */
 432 void
 433 cpp_add_dependency_target (cpp_reader *pfile, const char *target, int quote)
 434 {
 435   if (!pfile->deps)
 436     pfile->deps = deps_init ();
 437
 438   deps_add_target (pfile->deps, target, quote);
 439 }
 440
 441 /* This is called after options have been parsed, and partially
 442    processed.  */
 443 void
 444 cpp_post_options (cpp_reader *pfile)
 445 {
 446   sanity_checks (pfile);
 447
 448   post_options (pfile);
 449
 450   /* Mark named operators before handling command line macros.  */
 451   if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
 452     mark_named_operators (pfile);
 453 }
 454
 455 /* Setup for processing input from the file named FNAME, or stdin if
 456    it is the empty string.  Returns true if the file was found.  */
 457 bool
 458 cpp_find_main_file (cpp_reader *pfile, const char *fname)
 459 {
 460   if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
 461     {
 462       if (!pfile->deps)
 463         pfile->deps = deps_init ();
 464
 465       /* Set the default target (if there is none already).  */
 466       deps_add_default_target (pfile->deps, fname);
 467     }
 468
 469   pfile->main_file
 470     = _cpp_find_file (pfile, fname, &pfile->no_search_path, false);
 471   if (_cpp_find_failed (pfile->main_file))
 472     return false;
 473
 474   if (CPP_OPTION (pfile, working_directory))
 475     {
 476       const char *dir = getpwd ();
 477       char *dir_with_slashes = alloca (strlen (dir) + 3);
 478
 479       memcpy (dir_with_slashes, dir, strlen (dir));
 480       memcpy (dir_with_slashes + strlen (dir), "//", 3);
 481
 482       if (pfile->cb.dir_change)
 483         pfile->cb.dir_change (pfile, dir);
 484     }
 485   return true;
 486 }
 487
 488 /* This function reads the file, but does not start preprocessing.
 489    This will generate at least one file change callback, and possibly
 490    a line change callback.  */
 491 void
 492 cpp_push_main_file (cpp_reader *pfile)
 493 {
 494   _cpp_stack_file (pfile, pfile->main_file, false);
 495
 496   /* For foo.i, read the original filename foo.c now, for the benefit
 497      of the front ends.  */
 498   if (CPP_OPTION (pfile, preprocessed))
 499     read_original_filename (pfile);
 500
 501   /* Set this here so the client can change the option if it wishes,
 502      and after stacking the main file so we don't trace the main
 503      file.  */
 504   pfile->line_table->trace_includes = CPP_OPTION (pfile, print_include_names);
 505 }
 506
 507 /* For preprocessed files, if the first tokens are of the form # NUM.
 508    handle the directive so we know the original file name.  This will
 509    generate file_change callbacks, which the front ends must handle
 510    appropriately given their state of initialization.  */
 511 static void
 512 read_original_filename (cpp_reader *pfile)
 513 {
 514   const cpp_token *token, *token1;
 515
 516   /* Lex ahead; if the first tokens are of the form # NUM, then
 517      process the directive, otherwise back up.  */
 518   token = _cpp_lex_direct (pfile);
 519   if (token->type == CPP_HASH)
 520     {
 521       token1 = _cpp_lex_direct (pfile);
 522       _cpp_backup_tokens (pfile, 1);
 523
 524       /* If it's a #line directive, handle it.  */
 525       if (token1->type == CPP_NUMBER)
 526         {
 527           _cpp_handle_directive (pfile, token->flags & PREV_WHITE);
 528           read_original_directory (pfile);
 529           return;
 530         }
 531     }
 532
 533   /* Backup as if nothing happened.  */
 534   _cpp_backup_tokens (pfile, 1);
 535 }
 536
 537 /* For preprocessed files, if the tokens following the first filename
 538    line is of the form # <line> "/path/name//", handle the
 539    directive so we know the original current directory.  */
 540 static void
 541 read_original_directory (cpp_reader *pfile)
 542 {
 543   const cpp_token *hash, *token;
 544
 545   /* Lex ahead; if the first tokens are of the form # NUM, then
 546      process the directive, otherwise back up.  */
 547   hash = _cpp_lex_direct (pfile);
 548   if (hash->type != CPP_HASH)
 549     {
 550       _cpp_backup_tokens (pfile, 1);
 551       return;
 552     }
 553
 554   token = _cpp_lex_direct (pfile);
 555
 556   if (token->type != CPP_NUMBER)
 557     {
 558       _cpp_backup_tokens (pfile, 2);
 559       return;
 560     }
 561
 562   token = _cpp_lex_direct (pfile);
 563
 564   if (token->type != CPP_STRING
 565       || ! (token->val.str.len >= 5
 566             && token->val.str.text[token->val.str.len-2] == '/'
 567             && token->val.str.text[token->val.str.len-3] == '/'))
 568     {
 569       _cpp_backup_tokens (pfile, 3);
 570       return;
 571     }
 572
 573   if (pfile->cb.dir_change)
 574     {
 575       char *debugdir = alloca (token->val.str.len - 3);
 576
 577       memcpy (debugdir, (const char *) token->val.str.text + 1,
 578               token->val.str.len - 4);
 579       debugdir[token->val.str.len - 4] = '\0';
 580
 581       pfile->cb.dir_change (pfile, debugdir);
 582     }
 583
 584   /* We want to process the fake line changes as regular changes, to
 585      get them output.  */
 586   _cpp_backup_tokens (pfile, 3);
 587
 588   CPP_OPTION (pfile, working_directory) = false;
 589 }
 590
 591 /* This is called at the end of preprocessing.  It pops the last
 592    buffer and writes dependency output, and returns the number of
 593    errors.
 594
 595    Maybe it should also reset state, such that you could call
 596    cpp_start_read with a new filename to restart processing.  */
 597 int
 598 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
 599 {
 600   /* Warn about unused macros before popping the final buffer.  */
 601   if (CPP_OPTION (pfile, warn_unused_macros))
 602     cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
 603
 604   /* cpplex.c leaves the final buffer on the stack.  This it so that
 605      it returns an unending stream of CPP_EOFs to the client.  If we
 606      popped the buffer, we'd dereference a NULL buffer pointer and
 607      segfault.  It's nice to allow the client to do worry-free excess
 608      cpp_get_token calls.  */
 609   while (pfile->buffer)
 610     _cpp_pop_buffer (pfile);
 611
 612   /* Don't write the deps file if there are errors.  */
 613   if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
 614       && deps_stream && pfile->errors == 0)
 615     {
 616       deps_write (pfile->deps, deps_stream, 72);
 617
 618       if (CPP_OPTION (pfile, deps.phony_targets))
 619         deps_phony_targets (pfile->deps, deps_stream);
 620     }
 621
 622   /* Report on headers that could use multiple include guards.  */
 623   if (CPP_OPTION (pfile, print_include_names))
 624     _cpp_report_missing_guards (pfile);
 625
 626   return pfile->errors;
 627 }
 628
 629 static void
 630 post_options (cpp_reader *pfile)
 631 {
 632   /* -Wtraditional is not useful in C++ mode.  */
 633   if (CPP_OPTION (pfile, cplusplus))
 634     CPP_OPTION (pfile, warn_traditional) = 0;
 635
 636   /* Permanently disable macro expansion if we are rescanning
 637      preprocessed text.  Read preprocesed source in ISO mode.  */
 638   if (CPP_OPTION (pfile, preprocessed))
 639     {
 640       pfile->state.prevent_expansion = 1;
 641       CPP_OPTION (pfile, traditional) = 0;
 642     }
 643
 644   if (CPP_OPTION (pfile, warn_trigraphs) == 2)
 645     CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
 646
 647   if (CPP_OPTION (pfile, traditional))
 648     {
 649       /* Traditional CPP does not accurately track column information.  */
 650       CPP_OPTION (pfile, show_column) = 0;
 651       CPP_OPTION (pfile, trigraphs) = 0;
 652       CPP_OPTION (pfile, warn_trigraphs) = 0;
 653     }
 654 }