libcpp/init.c

   1 /* CPP Library.
   2    Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "cpplib.h"
  25 #include "internal.h"
  26 #include "mkdeps.h"
  27 #include "localedir.h"
  28
  29 static void init_library (void);
  30 static void mark_named_operators (cpp_reader *);
  31 static void read_original_filename (cpp_reader *);
  32 static void read_original_directory (cpp_reader *);
  33 static void post_options (cpp_reader *);
  34
  35 /* If we have designated initializers (GCC >2.7) these tables can be
  36    initialized, constant data.  Otherwise, they have to be filled in at
  37    runtime.  */
  38 #if HAVE_DESIGNATED_INITIALIZERS
  39
  40 #define init_trigraph_map()  /* Nothing.  */
  41 #define TRIGRAPH_MAP \
  42 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
  43
  44 #define END };
  45 #define s(p, v) [p] = v,
  46
  47 #else
  48
  49 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
  50  static void init_trigraph_map (void) { \
  51  unsigned char *x = _cpp_trigraph_map;
  52
  53 #define END }
  54 #define s(p, v) x[p] = v;
  55
  56 #endif
  57
  58 TRIGRAPH_MAP
  59   s('=', '#')   s(')', ']')     s('!', '|')
  60   s('(', '[')   s('\'', '^')    s('>', '}')
  61   s('/', '\\')  s('<', '{')     s('-', '~')
  62 END
  63
  64 #undef s
  65 #undef END
  66 #undef TRIGRAPH_MAP
  67
  68 /* A set of booleans indicating what CPP features each source language
  69    requires.  */
  70 struct lang_flags
  71 {
  72   char c99;
  73   char cplusplus;
  74   char extended_numbers;
  75   char extended_identifiers;
  76   char std;
  77   char cplusplus_comments;
  78   char digraphs;
  79 };
  80
  81 static const struct lang_flags lang_defaults[] =
  82 { /*              c99 c++ xnum xid std  //   digr  */
  83   /* GNUC89 */  { 0,  0,  1,   0,  0,   1,   1     },
  84   /* GNUC99 */  { 1,  0,  1,   0,  0,   1,   1     },
  85   /* STDC89 */  { 0,  0,  0,   0,  1,   0,   0     },
  86   /* STDC94 */  { 0,  0,  0,   0,  1,   0,   1     },
  87   /* STDC99 */  { 1,  0,  1,   0,  1,   1,   1     },
  88   /* GNUCXX */  { 0,  1,  1,   0,  0,   1,   1     },
  89   /* CXX98  */  { 0,  1,  1,   0,  1,   1,   1     },
  90   /* ASM    */  { 0,  0,  1,   0,  0,   1,   0     }
  91   /* xid should be 1 for GNUC99, STDC99, GNUCXX and CXX98 when no
  92      longer experimental (when all uses of identifiers in the compiler
  93      have been audited for correct handling of extended
  94      identifiers).  */
  95 };
  96
  97 /* Sets internal flags correctly for a given language.  */
  98 void
  99 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
 100 {
 101   const struct lang_flags *l = &lang_defaults[(int) lang];
 102
 103   CPP_OPTION (pfile, lang) = lang;
 104
 105   CPP_OPTION (pfile, c99)                        = l->c99;
 106   CPP_OPTION (pfile, cplusplus)                  = l->cplusplus;
 107   CPP_OPTION (pfile, extended_numbers)           = l->extended_numbers;
 108   CPP_OPTION (pfile, extended_identifiers)       = l->extended_identifiers;
 109   CPP_OPTION (pfile, std)                        = l->std;
 110   CPP_OPTION (pfile, trigraphs)                  = l->std;
 111   CPP_OPTION (pfile, cplusplus_comments)         = l->cplusplus_comments;
 112   CPP_OPTION (pfile, digraphs)                   = l->digraphs;
 113 }
 114
 115 /* Initialize library global state.  */
 116 static void
 117 init_library (void)
 118 {
 119   static int initialized = 0;
 120
 121   if (! initialized)
 122     {
 123       initialized = 1;
 124
 125       /* Set up the trigraph map.  This doesn't need to do anything if
 126          we were compiled with a compiler that supports C99 designated
 127          initializers.  */
 128       init_trigraph_map ();
 129
 130 #ifdef ENABLE_NLS
 131        (void) bindtextdomain (PACKAGE, LOCALEDIR);
 132 #endif
 133     }
 134 }
 135
 136 /* Initialize a cpp_reader structure.  */
 137 cpp_reader *
 138 cpp_create_reader (enum c_lang lang, hash_table *table,
 139                    struct line_maps *line_table)
 140 {
 141   cpp_reader *pfile;
 142
 143   /* Initialize this instance of the library if it hasn't been already.  */
 144   init_library ();
 145
 146   pfile = XCNEW (cpp_reader);
 147
 148   cpp_set_lang (pfile, lang);
 149   CPP_OPTION (pfile, warn_multichar) = 1;
 150   CPP_OPTION (pfile, discard_comments) = 1;
 151   CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
 152   CPP_OPTION (pfile, show_column) = 1;
 153   CPP_OPTION (pfile, tabstop) = 8;
 154   CPP_OPTION (pfile, operator_names) = 1;
 155   CPP_OPTION (pfile, warn_trigraphs) = 2;
 156   CPP_OPTION (pfile, warn_endif_labels) = 1;
 157   CPP_OPTION (pfile, warn_deprecated) = 1;
 158   CPP_OPTION (pfile, warn_long_long) = !CPP_OPTION (pfile, c99);
 159   CPP_OPTION (pfile, dollars_in_ident) = 1;
 160   CPP_OPTION (pfile, warn_dollars) = 1;
 161   CPP_OPTION (pfile, warn_variadic_macros) = 1;
 162   CPP_OPTION (pfile, warn_normalize) = normalized_C;
 163
 164   /* Default CPP arithmetic to something sensible for the host for the
 165      benefit of dumb users like fix-header.  */
 166   CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
 167   CPP_OPTION (pfile, char_precision) = CHAR_BIT;
 168   CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
 169   CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
 170   CPP_OPTION (pfile, unsigned_char) = 0;
 171   CPP_OPTION (pfile, unsigned_wchar) = 1;
 172   CPP_OPTION (pfile, bytes_big_endian) = 1;  /* does not matter */
 173
 174   /* Default to no charset conversion.  */
 175   CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
 176   CPP_OPTION (pfile, wide_charset) = 0;
 177
 178   /* Default the input character set to UTF-8.  */
 179   CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
 180
 181   /* A fake empty "directory" used as the starting point for files
 182      looked up without a search path.  Name cannot be '/' because we
 183      don't want to prepend anything at all to filenames using it.  All
 184      other entries are correct zero-initialized.  */
 185   pfile->no_search_path.name = (char *) "";
 186
 187   /* Initialize the line map.  */
 188   pfile->line_table = line_table;
 189
 190   /* Initialize lexer state.  */
 191   pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
 192
 193   /* Set up static tokens.  */
 194   pfile->avoid_paste.type = CPP_PADDING;
 195   pfile->avoid_paste.val.source = NULL;
 196   pfile->eof.type = CPP_EOF;
 197   pfile->eof.flags = 0;
 198
 199   /* Create a token buffer for the lexer.  */
 200   _cpp_init_tokenrun (&pfile->base_run, 250);
 201   pfile->cur_run = &pfile->base_run;
 202   pfile->cur_token = pfile->base_run.base;
 203
 204   /* Initialize the base context.  */
 205   pfile->context = &pfile->base_context;
 206   pfile->base_context.macro = 0;
 207   pfile->base_context.prev = pfile->base_context.next = 0;
 208
 209   /* Aligned and unaligned storage.  */
 210   pfile->a_buff = _cpp_get_buff (pfile, 0);
 211   pfile->u_buff = _cpp_get_buff (pfile, 0);
 212
 213   /* The expression parser stack.  */
 214   _cpp_expand_op_stack (pfile);
 215
 216   /* Initialize the buffer obstack.  */
 217   _obstack_begin (&pfile->buffer_ob, 0, 0,
 218                   (void *(*) (long)) xmalloc,
 219                   (void (*) (void *)) free);
 220
 221   _cpp_init_files (pfile);
 222
 223   _cpp_init_hashtable (pfile, table);
 224
 225   return pfile;
 226 }
 227
 228 /* Free resources used by PFILE.  Accessing PFILE after this function
 229    returns leads to undefined behavior.  Returns the error count.  */
 230 void
 231 cpp_destroy (cpp_reader *pfile)
 232 {
 233   cpp_context *context, *contextn;
 234   tokenrun *run, *runn;
 235
 236   free (pfile->op_stack);
 237
 238   while (CPP_BUFFER (pfile) != NULL)
 239     _cpp_pop_buffer (pfile);
 240
 241   if (pfile->out.base)
 242     free (pfile->out.base);
 243
 244   if (pfile->macro_buffer)
 245     {
 246       free (pfile->macro_buffer);
 247       pfile->macro_buffer = NULL;
 248       pfile->macro_buffer_len = 0;
 249     }
 250
 251   if (pfile->deps)
 252     deps_free (pfile->deps);
 253   obstack_free (&pfile->buffer_ob, 0);
 254
 255   _cpp_destroy_hashtable (pfile);
 256   _cpp_cleanup_files (pfile);
 257   _cpp_destroy_iconv (pfile);
 258
 259   _cpp_free_buff (pfile->a_buff);
 260   _cpp_free_buff (pfile->u_buff);
 261   _cpp_free_buff (pfile->free_buffs);
 262
 263   for (run = &pfile->base_run; run; run = runn)
 264     {
 265       runn = run->next;
 266       free (run->base);
 267       if (run != &pfile->base_run)
 268         free (run);
 269     }
 270
 271   for (context = pfile->base_context.next; context; context = contextn)
 272     {
 273       contextn = context->next;
 274       free (context);
 275     }
 276
 277   free (pfile);
 278 }
 279
 280 /* This structure defines one built-in identifier.  A node will be
 281    entered in the hash table under the name NAME, with value VALUE.
 282
 283    There are two tables of these.  builtin_array holds all the
 284    "builtin" macros: these are handled by builtin_macro() in
 285    macro.c.  Builtin is somewhat of a misnomer -- the property of
 286    interest is that these macros require special code to compute their
 287    expansions.  The value is a "builtin_type" enumerator.
 288
 289    operator_array holds the C++ named operators.  These are keywords
 290    which act as aliases for punctuators.  In C++, they cannot be
 291    altered through #define, and #if recognizes them as operators.  In
 292    C, these are not entered into the hash table at all (but see
 293    <iso646.h>).  The value is a token-type enumerator.  */
 294 struct builtin
 295 {
 296   const uchar *name;
 297   unsigned short len;
 298   unsigned short value;
 299 };
 300
 301 #define B(n, t)    { DSC(n), t }
 302 static const struct builtin builtin_array[] =
 303 {
 304   B("__TIME__",          BT_TIME),
 305   B("__DATE__",          BT_DATE),
 306   B("__FILE__",          BT_FILE),
 307   B("__BASE_FILE__",     BT_BASE_FILE),
 308   B("__LINE__",          BT_SPECLINE),
 309   B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL),
 310   /* Keep builtins not used for -traditional-cpp at the end, and
 311      update init_builtins() if any more are added.  */
 312   B("_Pragma",           BT_PRAGMA),
 313   B("__STDC__",          BT_STDC),
 314 };
 315
 316 static const struct builtin operator_array[] =
 317 {
 318   B("and",      CPP_AND_AND),
 319   B("and_eq",   CPP_AND_EQ),
 320   B("bitand",   CPP_AND),
 321   B("bitor",    CPP_OR),
 322   B("compl",    CPP_COMPL),
 323   B("not",      CPP_NOT),
 324   B("not_eq",   CPP_NOT_EQ),
 325   B("or",       CPP_OR_OR),
 326   B("or_eq",    CPP_OR_EQ),
 327   B("xor",      CPP_XOR),
 328   B("xor_eq",   CPP_XOR_EQ)
 329 };
 330 #undef B
 331
 332 /* Mark the C++ named operators in the hash table.  */
 333 static void
 334 mark_named_operators (cpp_reader *pfile)
 335 {
 336   const struct builtin *b;
 337
 338   for (b = operator_array;
 339        b < (operator_array + ARRAY_SIZE (operator_array));
 340        b++)
 341     {
 342       cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
 343       hp->flags |= NODE_OPERATOR;
 344       hp->is_directive = 0;
 345       hp->directive_index = b->value;
 346     }
 347 }
 348
 349 /* Read the builtins table above and enter them, and language-specific
 350    macros, into the hash table.  HOSTED is true if this is a hosted
 351    environment.  */
 352 void
 353 cpp_init_builtins (cpp_reader *pfile, int hosted)
 354 {
 355   const struct builtin *b;
 356   size_t n = ARRAY_SIZE (builtin_array);
 357
 358   if (CPP_OPTION (pfile, traditional))
 359     n -= 2;
 360   else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
 361            || CPP_OPTION (pfile, std))
 362     {
 363       n--;
 364       _cpp_define_builtin (pfile, "__STDC__ 1");
 365     }
 366
 367   for (b = builtin_array; b < builtin_array + n; b++)
 368     {
 369       cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
 370       hp->type = NT_MACRO;
 371       hp->flags |= NODE_BUILTIN | NODE_WARN;
 372       hp->value.builtin = (enum builtin_type) b->value;
 373     }
 374
 375   if (CPP_OPTION (pfile, cplusplus))
 376     _cpp_define_builtin (pfile, "__cplusplus 1");
 377   else if (CPP_OPTION (pfile, lang) == CLK_ASM)
 378     _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
 379   else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
 380     _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
 381   else if (CPP_OPTION (pfile, c99))
 382     _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
 383
 384   if (hosted)
 385     _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
 386   else
 387     _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
 388
 389   if (CPP_OPTION (pfile, objc))
 390     _cpp_define_builtin (pfile, "__OBJC__ 1");
 391 }
 392
 393 /* Sanity-checks are dependent on command-line options, so it is
 394    called as a subroutine of cpp_read_main_file ().  */
 395 #if ENABLE_CHECKING
 396 static void sanity_checks (cpp_reader *);
 397 static void sanity_checks (cpp_reader *pfile)
 398 {
 399   cppchar_t test = 0;
 400   size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
 401
 402   /* Sanity checks for assumptions about CPP arithmetic and target
 403      type precisions made by cpplib.  */
 404   test--;
 405   if (test < 1)
 406     cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
 407
 408   if (CPP_OPTION (pfile, precision) > max_precision)
 409     cpp_error (pfile, CPP_DL_ICE,
 410                "preprocessor arithmetic has maximum precision of %lu bits;"
 411                " target requires %lu bits",
 412                (unsigned long) max_precision,
 413                (unsigned long) CPP_OPTION (pfile, precision));
 414
 415   if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
 416     cpp_error (pfile, CPP_DL_ICE,
 417                "CPP arithmetic must be at least as precise as a target int");
 418
 419   if (CPP_OPTION (pfile, char_precision) < 8)
 420     cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
 421
 422   if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
 423     cpp_error (pfile, CPP_DL_ICE,
 424                "target wchar_t is narrower than target char");
 425
 426   if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
 427     cpp_error (pfile, CPP_DL_ICE,
 428                "target int is narrower than target char");
 429
 430   /* This is assumed in eval_token() and could be fixed if necessary.  */
 431   if (sizeof (cppchar_t) > sizeof (cpp_num_part))
 432     cpp_error (pfile, CPP_DL_ICE,
 433                "CPP half-integer narrower than CPP character");
 434
 435   if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
 436     cpp_error (pfile, CPP_DL_ICE,
 437                "CPP on this host cannot handle wide character constants over"
 438                " %lu bits, but the target requires %lu bits",
 439                (unsigned long) BITS_PER_CPPCHAR_T,
 440                (unsigned long) CPP_OPTION (pfile, wchar_precision));
 441 }
 442 #else
 443 # define sanity_checks(PFILE)
 444 #endif
 445
 446 /* This is called after options have been parsed, and partially
 447    processed.  */
 448 void
 449 cpp_post_options (cpp_reader *pfile)
 450 {
 451   sanity_checks (pfile);
 452
 453   post_options (pfile);
 454
 455   /* Mark named operators before handling command line macros.  */
 456   if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
 457     mark_named_operators (pfile);
 458 }
 459
 460 /* Setup for processing input from the file named FNAME, or stdin if
 461    it is the empty string.  Return the original filename
 462    on success (e.g. foo.i->foo.c), or NULL on failure.  */
 463 const char *
 464 cpp_read_main_file (cpp_reader *pfile, const char *fname)
 465 {
 466   if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
 467     {
 468       if (!pfile->deps)
 469         pfile->deps = deps_init ();
 470
 471       /* Set the default target (if there is none already).  */
 472       deps_add_default_target (pfile->deps, fname);
 473     }
 474
 475   pfile->main_file
 476     = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0);
 477   if (_cpp_find_failed (pfile->main_file))
 478     return NULL;
 479
 480   _cpp_stack_file (pfile, pfile->main_file, false);
 481
 482   /* For foo.i, read the original filename foo.c now, for the benefit
 483      of the front ends.  */
 484   if (CPP_OPTION (pfile, preprocessed))
 485     {
 486       read_original_filename (pfile);
 487       fname = pfile->line_table->maps[pfile->line_table->used-1].to_file;
 488     }
 489   return fname;
 490 }
 491
 492 /* For preprocessed files, if the first tokens are of the form # NUM.
 493    handle the directive so we know the original file name.  This will
 494    generate file_change callbacks, which the front ends must handle
 495    appropriately given their state of initialization.  */
 496 static void
 497 read_original_filename (cpp_reader *pfile)
 498 {
 499   const cpp_token *token, *token1;
 500
 501   /* Lex ahead; if the first tokens are of the form # NUM, then
 502      process the directive, otherwise back up.  */
 503   token = _cpp_lex_direct (pfile);
 504   if (token->type == CPP_HASH)
 505     {
 506       pfile->state.in_directive = 1;
 507       token1 = _cpp_lex_direct (pfile);
 508       _cpp_backup_tokens (pfile, 1);
 509       pfile->state.in_directive = 0;
 510
 511       /* If it's a #line directive, handle it.  */
 512       if (token1->type == CPP_NUMBER)
 513         {
 514           _cpp_handle_directive (pfile, token->flags & PREV_WHITE);
 515           read_original_directory (pfile);
 516           return;
 517         }
 518     }
 519
 520   /* Backup as if nothing happened.  */
 521   _cpp_backup_tokens (pfile, 1);
 522 }
 523
 524 /* For preprocessed files, if the tokens following the first filename
 525    line is of the form # <line> "/path/name//", handle the
 526    directive so we know the original current directory.  */
 527 static void
 528 read_original_directory (cpp_reader *pfile)
 529 {
 530   const cpp_token *hash, *token;
 531
 532   /* Lex ahead; if the first tokens are of the form # NUM, then
 533      process the directive, otherwise back up.  */
 534   hash = _cpp_lex_direct (pfile);
 535   if (hash->type != CPP_HASH)
 536     {
 537       _cpp_backup_tokens (pfile, 1);
 538       return;
 539     }
 540
 541   token = _cpp_lex_direct (pfile);
 542
 543   if (token->type != CPP_NUMBER)
 544     {
 545       _cpp_backup_tokens (pfile, 2);
 546       return;
 547     }
 548
 549   token = _cpp_lex_direct (pfile);
 550
 551   if (token->type != CPP_STRING
 552       || ! (token->val.str.len >= 5
 553             && token->val.str.text[token->val.str.len-2] == '/'
 554             && token->val.str.text[token->val.str.len-3] == '/'))
 555     {
 556       _cpp_backup_tokens (pfile, 3);
 557       return;
 558     }
 559
 560   if (pfile->cb.dir_change)
 561     {
 562       char *debugdir = (char *) alloca (token->val.str.len - 3);
 563
 564       memcpy (debugdir, (const char *) token->val.str.text + 1,
 565               token->val.str.len - 4);
 566       debugdir[token->val.str.len - 4] = '\0';
 567
 568       pfile->cb.dir_change (pfile, debugdir);
 569     }
 570 }
 571
 572 /* This is called at the end of preprocessing.  It pops the last
 573    buffer and writes dependency output, and returns the number of
 574    errors.
 575
 576    Maybe it should also reset state, such that you could call
 577    cpp_start_read with a new filename to restart processing.  */
 578 int
 579 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
 580 {
 581   /* Warn about unused macros before popping the final buffer.  */
 582   if (CPP_OPTION (pfile, warn_unused_macros))
 583     cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
 584
 585   /* lex.c leaves the final buffer on the stack.  This it so that
 586      it returns an unending stream of CPP_EOFs to the client.  If we
 587      popped the buffer, we'd dereference a NULL buffer pointer and
 588      segfault.  It's nice to allow the client to do worry-free excess
 589      cpp_get_token calls.  */
 590   while (pfile->buffer)
 591     _cpp_pop_buffer (pfile);
 592
 593   /* Don't write the deps file if there are errors.  */
 594   if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
 595       && deps_stream && pfile->errors == 0)
 596     {
 597       deps_write (pfile->deps, deps_stream, 72);
 598
 599       if (CPP_OPTION (pfile, deps.phony_targets))
 600         deps_phony_targets (pfile->deps, deps_stream);
 601     }
 602
 603   /* Report on headers that could use multiple include guards.  */
 604   if (CPP_OPTION (pfile, print_include_names))
 605     _cpp_report_missing_guards (pfile);
 606
 607   return pfile->errors;
 608 }
 609
 610 static void
 611 post_options (cpp_reader *pfile)
 612 {
 613   /* -Wtraditional is not useful in C++ mode.  */
 614   if (CPP_OPTION (pfile, cplusplus))
 615     CPP_OPTION (pfile, warn_traditional) = 0;
 616
 617   /* Permanently disable macro expansion if we are rescanning
 618      preprocessed text.  Read preprocesed source in ISO mode.  */
 619   if (CPP_OPTION (pfile, preprocessed))
 620     {
 621       pfile->state.prevent_expansion = 1;
 622       CPP_OPTION (pfile, traditional) = 0;
 623     }
 624
 625   if (CPP_OPTION (pfile, warn_trigraphs) == 2)
 626     CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
 627
 628   if (CPP_OPTION (pfile, traditional))
 629     {
 630       CPP_OPTION (pfile, cplusplus_comments) = 0;
 631
 632       /* Traditional CPP does not accurately track column information.  */
 633       CPP_OPTION (pfile, show_column) = 0;
 634       CPP_OPTION (pfile, trigraphs) = 0;
 635       CPP_OPTION (pfile, warn_trigraphs) = 0;
 636     }
 637 }