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