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, DL_ICE, "cppchar_t must be an unsigned type");
 387
 388   if (CPP_OPTION (pfile, precision) > max_precision)
 389     cpp_error (pfile, 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, 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, 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, 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, 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, DL_ICE, "CPP half-integer narrower than CPP character");
 413
 414   if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
 415     cpp_error (pfile, DL_ICE,
 416                "CPP on this host cannot handle wide character constants over"
 417                " %lu bits, but the target requires %lu bits",
 418                (unsigned long) BITS_PER_CPPCHAR_T,
 419                (unsigned long) CPP_OPTION (pfile, wchar_precision));
 420 }
 421 #else
 422 # define sanity_checks(PFILE)
 423 #endif
 424
 425 /* Add a dependency target.  Can be called any number of times before
 426    cpp_read_main_file().  If no targets have been added before
 427    cpp_read_main_file(), then the default target is used.  */
 428 void
 429 cpp_add_dependency_target (cpp_reader *pfile, const char *target, int quote)
 430 {
 431   if (!pfile->deps)
 432     pfile->deps = deps_init ();
 433
 434   deps_add_target (pfile->deps, target, quote);
 435 }
 436
 437 /* This is called after options have been parsed, and partially
 438    processed. */
 439 void
 440 cpp_post_options (cpp_reader *pfile)
 441 {
 442   sanity_checks (pfile);
 443
 444   post_options (pfile);
 445
 446   /* Mark named operators before handling command line macros.  */
 447   if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
 448     mark_named_operators (pfile);
 449 }
 450
 451 /* Setup for processing input from the file named FNAME,
 452    or stdin if it is the empty string.  Return the original filename
 453    on success (e.g. foo.i->foo.c), or NULL on failure.  */
 454 const char *
 455 cpp_read_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   if (!_cpp_stack_file (pfile, fname))
 467     return NULL;
 468
 469   /* Set this here so the client can change the option if it wishes,
 470      and after stacking the main file so we don't trace the main
 471      file.  */
 472   pfile->line_maps.trace_includes = CPP_OPTION (pfile, print_include_names);
 473
 474   /* For foo.i, read the original filename foo.c now, for the benefit
 475      of the front ends.  */
 476   if (CPP_OPTION (pfile, preprocessed))
 477     read_original_filename (pfile);
 478
 479   if (CPP_OPTION (pfile, working_directory))
 480     {
 481       const char *name = pfile->map->to_file;
 482       const char *dir = getpwd ();
 483       char *dir_with_slashes = alloca (strlen (dir) + 3);
 484
 485       memcpy (dir_with_slashes, dir, strlen (dir));
 486       memcpy (dir_with_slashes + strlen (dir), "//", 3);
 487
 488       if (pfile->cb.dir_change)
 489         pfile->cb.dir_change (pfile, dir);
 490       /* Emit file renames that will be recognized by
 491          read_directory_filename, since dir_change doesn't output
 492          anything.  */
 493       _cpp_do_file_change (pfile, LC_RENAME, dir_with_slashes, 1, 0);
 494       _cpp_do_file_change (pfile, LC_RENAME, name, 1, 0);
 495     }
 496
 497   return pfile->map->to_file;
 498 }
 499
 500 /* For preprocessed files, if the first tokens are of the form # NUM.
 501    handle the directive so we know the original file name.  This will
 502    generate file_change callbacks, which the front ends must handle
 503    appropriately given their state of initialization.  */
 504 static void
 505 read_original_filename (cpp_reader *pfile)
 506 {
 507   const cpp_token *token, *token1;
 508
 509   /* Lex ahead; if the first tokens are of the form # NUM, then
 510      process the directive, otherwise back up.  */
 511   token = _cpp_lex_direct (pfile);
 512   if (token->type == CPP_HASH)
 513     {
 514       token1 = _cpp_lex_direct (pfile);
 515       _cpp_backup_tokens (pfile, 1);
 516
 517       /* If it's a #line directive, handle it.  */
 518       if (token1->type == CPP_NUMBER)
 519         {
 520           _cpp_handle_directive (pfile, token->flags & PREV_WHITE);
 521           read_original_directory (pfile);
 522           return;
 523         }
 524     }
 525
 526   /* Backup as if nothing happened.  */
 527   _cpp_backup_tokens (pfile, 1);
 528 }
 529
 530 /* For preprocessed files, if the tokens following the first filename
 531    line is of the form # <line> "/path/name//", handle the
 532    directive so we know the original current directory.  */
 533 static void
 534 read_original_directory (cpp_reader *pfile)
 535 {
 536   const cpp_token *hash, *token;
 537
 538   /* Lex ahead; if the first tokens are of the form # NUM, then
 539      process the directive, otherwise back up.  */
 540   hash = _cpp_lex_direct (pfile);
 541   if (hash->type != CPP_HASH)
 542     {
 543       _cpp_backup_tokens (pfile, 1);
 544       return;
 545     }
 546
 547   token = _cpp_lex_direct (pfile);
 548
 549   if (token->type != CPP_NUMBER)
 550     {
 551       _cpp_backup_tokens (pfile, 2);
 552       return;
 553     }
 554
 555   token = _cpp_lex_direct (pfile);
 556
 557   if (token->type != CPP_STRING
 558       || ! (token->val.str.len >= 5
 559             && token->val.str.text[token->val.str.len-2] == '/'
 560             && token->val.str.text[token->val.str.len-3] == '/'))
 561     {
 562       _cpp_backup_tokens (pfile, 3);
 563       return;
 564     }
 565
 566   if (pfile->cb.dir_change)
 567     {
 568       char *debugdir = alloca (token->val.str.len - 3);
 569
 570       memcpy (debugdir, (const char *) token->val.str.text + 1,
 571               token->val.str.len - 4);
 572       debugdir[token->val.str.len - 4] = '\0';
 573
 574       pfile->cb.dir_change (pfile, debugdir);
 575     }
 576
 577   /* We want to process the fake line changes as regular changes, to
 578      get them output.  */
 579   _cpp_backup_tokens (pfile, 3);
 580
 581   CPP_OPTION (pfile, working_directory) = false;
 582 }
 583
 584 /* This is called at the end of preprocessing.  It pops the last
 585    buffer and writes dependency output, and returns the number of
 586    errors.
 587
 588    Maybe it should also reset state, such that you could call
 589    cpp_start_read with a new filename to restart processing.  */
 590 int
 591 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
 592 {
 593   /* Warn about unused macros before popping the final buffer.  */
 594   if (CPP_OPTION (pfile, warn_unused_macros))
 595     cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
 596
 597   /* cpplex.c leaves the final buffer on the stack.  This it so that
 598      it returns an unending stream of CPP_EOFs to the client.  If we
 599      popped the buffer, we'd dereference a NULL buffer pointer and
 600      segfault.  It's nice to allow the client to do worry-free excess
 601      cpp_get_token calls.  */
 602   while (pfile->buffer)
 603     _cpp_pop_buffer (pfile);
 604
 605   /* Don't write the deps file if there are errors.  */
 606   if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
 607       && deps_stream && pfile->errors == 0)
 608     {
 609       deps_write (pfile->deps, deps_stream, 72);
 610
 611       if (CPP_OPTION (pfile, deps.phony_targets))
 612         deps_phony_targets (pfile->deps, deps_stream);
 613     }
 614
 615   /* Report on headers that could use multiple include guards.  */
 616   if (CPP_OPTION (pfile, print_include_names))
 617     _cpp_report_missing_guards (pfile);
 618
 619   return pfile->errors;
 620 }
 621
 622 static void
 623 post_options (cpp_reader *pfile)
 624 {
 625   /* -Wtraditional is not useful in C++ mode.  */
 626   if (CPP_OPTION (pfile, cplusplus))
 627     CPP_OPTION (pfile, warn_traditional) = 0;
 628
 629   /* Permanently disable macro expansion if we are rescanning
 630      preprocessed text.  Read preprocesed source in ISO mode.  */
 631   if (CPP_OPTION (pfile, preprocessed))
 632     {
 633       pfile->state.prevent_expansion = 1;
 634       CPP_OPTION (pfile, traditional) = 0;
 635     }
 636
 637   if (CPP_OPTION (pfile, warn_trigraphs) == 2)
 638     CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
 639
 640   if (CPP_OPTION (pfile, traditional))
 641     {
 642       /* Traditional CPP does not accurately track column information.  */
 643       CPP_OPTION (pfile, show_column) = 0;
 644       CPP_OPTION (pfile, trigraphs) = 0;
 645       CPP_OPTION (pfile, warn_trigraphs) = 0;
 646     }
 647 }