gcc/c-family/c-ppoutput.c

   1 /* Preprocess only, using cpplib.
   2    Copyright (C) 1995-2018 Free Software Foundation, Inc.
   3    Written by Per Bothner, 1994-95.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 3, or (at your option) any
   8    later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; see the file COPYING3.  If not see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include "config.h"
  20 #include "system.h"
  21 #include "coretypes.h"
  22 #include "c-common.h"           /* For flags.  */
  23 #include "../libcpp/internal.h"
  24 #include "c-pragma.h"           /* For parse_in.  */
  25 #include "file-prefix-map.h"    /* remap_macro_filename()  */
  26
  27 /* Encapsulates state used to convert a stream of tokens into a text
  28    file.  */
  29 static struct
  30 {
  31   FILE *outf;                   /* Stream to write to.  */
  32   const cpp_token *prev;        /* Previous token.  */
  33   const cpp_token *source;      /* Source token for spacing.  */
  34   int src_line;                 /* Line number currently being written.  */
  35   bool printed;                 /* True if something output at line.  */
  36   bool first_time;              /* pp_file_change hasn't been called yet.  */
  37   bool prev_was_system_token;   /* True if the previous token was a
  38                                    system token.*/
  39   const char *src_file;         /* Current source file.  */
  40 } print;
  41
  42 /* Defined and undefined macros being queued for output with -dU at
  43    the next newline.  */
  44 struct macro_queue
  45 {
  46   struct macro_queue *next;     /* Next macro in the list.  */
  47   char *macro;                  /* The name of the macro if not
  48                                    defined, the full definition if
  49                                    defined.  */
  50 };
  51 static macro_queue *define_queue, *undef_queue;
  52
  53 /* General output routines.  */
  54 static void scan_translation_unit (cpp_reader *);
  55 static void print_lines_directives_only (int, const void *, size_t);
  56 static void scan_translation_unit_directives_only (cpp_reader *);
  57 static void scan_translation_unit_trad (cpp_reader *);
  58 static void account_for_newlines (const unsigned char *, size_t);
  59 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
  60 static void dump_queued_macros (cpp_reader *);
  61
  62 static bool print_line_1 (location_t, const char*, FILE *);
  63 static bool print_line (location_t, const char *);
  64 static bool maybe_print_line_1 (location_t, FILE *);
  65 static bool maybe_print_line (location_t);
  66 static bool do_line_change (cpp_reader *, const cpp_token *,
  67                             location_t, int);
  68
  69 /* Callback routines for the parser.   Most of these are active only
  70    in specific modes.  */
  71 static void cb_line_change (cpp_reader *, const cpp_token *, int);
  72 static void cb_define (cpp_reader *, location_t, cpp_hashnode *);
  73 static void cb_undef (cpp_reader *, location_t, cpp_hashnode *);
  74 static void cb_used_define (cpp_reader *, location_t, cpp_hashnode *);
  75 static void cb_used_undef (cpp_reader *, location_t, cpp_hashnode *);
  76 static void cb_include (cpp_reader *, location_t, const unsigned char *,
  77                         const char *, int, const cpp_token **);
  78 static void cb_ident (cpp_reader *, location_t, const cpp_string *);
  79 static void cb_def_pragma (cpp_reader *, location_t);
  80 static void cb_read_pch (cpp_reader *pfile, const char *name,
  81                          int fd, const char *orig_name);
  82
  83 /* Preprocess and output.  */
  84 void
  85 preprocess_file (cpp_reader *pfile)
  86 {
  87   /* A successful cpp_read_main_file guarantees that we can call
  88      cpp_scan_nooutput or cpp_get_token next.  */
  89   if (flag_no_output && pfile->buffer)
  90     {
  91       /* Scan -included buffers, then the main file.  */
  92       while (pfile->buffer->prev)
  93         cpp_scan_nooutput (pfile);
  94       cpp_scan_nooutput (pfile);
  95     }
  96   else if (cpp_get_options (pfile)->traditional)
  97     scan_translation_unit_trad (pfile);
  98   else if (cpp_get_options (pfile)->directives_only
  99            && !cpp_get_options (pfile)->preprocessed)
 100     scan_translation_unit_directives_only (pfile);
 101   else
 102     scan_translation_unit (pfile);
 103
 104   /* -dM command line option.  Should this be elsewhere?  */
 105   if (flag_dump_macros == 'M')
 106     cpp_forall_identifiers (pfile, dump_macro, NULL);
 107
 108   /* Flush any pending output.  */
 109   if (print.printed)
 110     putc ('\n', print.outf);
 111 }
 112
 113 /* Set up the callbacks as appropriate.  */
 114 void
 115 init_pp_output (FILE *out_stream)
 116 {
 117   cpp_callbacks *cb = cpp_get_callbacks (parse_in);
 118
 119   if (!flag_no_output)
 120     {
 121       cb->line_change = cb_line_change;
 122       /* Don't emit #pragma or #ident directives if we are processing
 123          assembly language; the assembler may choke on them.  */
 124       if (cpp_get_options (parse_in)->lang != CLK_ASM)
 125         {
 126           cb->ident      = cb_ident;
 127           cb->def_pragma = cb_def_pragma;
 128         }
 129     }
 130
 131   if (flag_dump_includes)
 132     cb->include  = cb_include;
 133
 134   if (flag_pch_preprocess)
 135     {
 136       cb->valid_pch = c_common_valid_pch;
 137       cb->read_pch = cb_read_pch;
 138     }
 139
 140   if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
 141     {
 142       cb->define = cb_define;
 143       cb->undef  = cb_undef;
 144     }
 145
 146   if (flag_dump_macros == 'U')
 147     {
 148       cb->before_define = dump_queued_macros;
 149       cb->used_define = cb_used_define;
 150       cb->used_undef = cb_used_undef;
 151     }
 152
 153   cb->has_attribute = c_common_has_attribute;
 154   cb->get_source_date_epoch = cb_get_source_date_epoch;
 155   cb->remap_filename = remap_macro_filename;
 156
 157   /* Initialize the print structure.  */
 158   print.src_line = 1;
 159   print.printed = false;
 160   print.prev = 0;
 161   print.outf = out_stream;
 162   print.first_time = 1;
 163   print.src_file = "";
 164   print.prev_was_system_token = false;
 165 }
 166
 167 /* Writes out the preprocessed file, handling spacing and paste
 168    avoidance issues.  */
 169 static void
 170 scan_translation_unit (cpp_reader *pfile)
 171 {
 172   bool avoid_paste = false;
 173   bool do_line_adjustments
 174     = cpp_get_options (parse_in)->lang != CLK_ASM
 175       && !flag_no_line_commands;
 176   bool in_pragma = false;
 177   bool line_marker_emitted = false;
 178
 179   print.source = NULL;
 180   for (;;)
 181     {
 182       location_t loc;
 183       const cpp_token *token = cpp_get_token_with_location (pfile, &loc);
 184
 185       if (token->type == CPP_PADDING)
 186         {
 187           avoid_paste = true;
 188           if (print.source == NULL
 189               || (!(print.source->flags & PREV_WHITE)
 190                   && token->val.source == NULL))
 191             print.source = token->val.source;
 192           continue;
 193         }
 194
 195       if (token->type == CPP_EOF)
 196         break;
 197
 198       /* Subtle logic to output a space if and only if necessary.  */
 199       if (avoid_paste)
 200         {
 201           int src_line = LOCATION_LINE (loc);
 202
 203           if (print.source == NULL)
 204             print.source = token;
 205
 206           if (src_line != print.src_line
 207               && do_line_adjustments
 208               && !in_pragma)
 209             {
 210               line_marker_emitted = do_line_change (pfile, token, loc, false);
 211               putc (' ', print.outf);
 212               print.printed = true;
 213             }
 214           else if (print.source->flags & PREV_WHITE
 215                    || (print.prev
 216                        && cpp_avoid_paste (pfile, print.prev, token))
 217                    || (print.prev == NULL && token->type == CPP_HASH))
 218             {
 219               putc (' ', print.outf);
 220               print.printed = true;
 221             }
 222         }
 223       else if (token->flags & PREV_WHITE)
 224         {
 225           int src_line = LOCATION_LINE (loc);
 226
 227           if (src_line != print.src_line
 228               && do_line_adjustments
 229               && !in_pragma)
 230             line_marker_emitted = do_line_change (pfile, token, loc, false);
 231           putc (' ', print.outf);
 232           print.printed = true;
 233         }
 234
 235       avoid_paste = false;
 236       print.source = NULL;
 237       print.prev = token;
 238       if (token->type == CPP_PRAGMA)
 239         {
 240           const char *space;
 241           const char *name;
 242
 243           line_marker_emitted = maybe_print_line (token->src_loc);
 244           fputs ("#pragma ", print.outf);
 245           c_pp_lookup_pragma (token->val.pragma, &space, &name);
 246           if (space)
 247             fprintf (print.outf, "%s %s", space, name);
 248           else
 249             fprintf (print.outf, "%s", name);
 250           print.printed = true;
 251           in_pragma = true;
 252         }
 253       else if (token->type == CPP_PRAGMA_EOL)
 254         {
 255           maybe_print_line (token->src_loc);
 256           in_pragma = false;
 257         }
 258       else
 259         {
 260           if (cpp_get_options (parse_in)->debug)
 261             linemap_dump_location (line_table, token->src_loc, print.outf);
 262
 263           if (do_line_adjustments
 264               && !in_pragma
 265               && !line_marker_emitted
 266               && print.prev_was_system_token != !!in_system_header_at (loc)
 267               && !is_location_from_builtin_token (loc))
 268             /* The system-ness of this token is different from the one
 269                of the previous token.  Let's emit a line change to
 270                mark the new system-ness before we emit the token.  */
 271             {
 272               do_line_change (pfile, token, loc, false);
 273               print.prev_was_system_token = !!in_system_header_at (loc);
 274             }
 275           cpp_output_token (token, print.outf);
 276           line_marker_emitted = false;
 277           print.printed = true;
 278         }
 279
 280       /* CPP_COMMENT tokens and raw-string literal tokens can
 281          have embedded new-line characters.  Rather than enumerating
 282          all the possible token types just check if token uses
 283          val.str union member.  */
 284       if (cpp_token_val_index (token) == CPP_TOKEN_FLD_STR)
 285         account_for_newlines (token->val.str.text, token->val.str.len);
 286     }
 287 }
 288
 289 static void
 290 print_lines_directives_only (int lines, const void *buf, size_t size)
 291 {
 292   print.src_line += lines;
 293   fwrite (buf, 1, size, print.outf);
 294 }
 295
 296 /* Writes out the preprocessed file, handling spacing and paste
 297    avoidance issues.  */
 298 static void
 299 scan_translation_unit_directives_only (cpp_reader *pfile)
 300 {
 301   struct _cpp_dir_only_callbacks cb;
 302
 303   cb.print_lines = print_lines_directives_only;
 304   cb.maybe_print_line = maybe_print_line;
 305
 306   _cpp_preprocess_dir_only (pfile, &cb);
 307 }
 308
 309 /* Adjust print.src_line for newlines embedded in output.  */
 310 static void
 311 account_for_newlines (const unsigned char *str, size_t len)
 312 {
 313   while (len--)
 314     if (*str++ == '\n')
 315       print.src_line++;
 316 }
 317
 318 /* Writes out a traditionally preprocessed file.  */
 319 static void
 320 scan_translation_unit_trad (cpp_reader *pfile)
 321 {
 322   while (_cpp_read_logical_line_trad (pfile))
 323     {
 324       size_t len = pfile->out.cur - pfile->out.base;
 325       maybe_print_line (pfile->out.first_line);
 326       fwrite (pfile->out.base, 1, len, print.outf);
 327       print.printed = true;
 328       if (!CPP_OPTION (pfile, discard_comments))
 329         account_for_newlines (pfile->out.base, len);
 330     }
 331 }
 332
 333 /* If the token read on logical line LINE needs to be output on a
 334    different line to the current one, output the required newlines or
 335    a line marker.  If a line marker was emitted, return TRUE otherwise
 336    return FALSE.  */
 337
 338 static bool
 339 maybe_print_line_1 (location_t src_loc, FILE *stream)
 340 {
 341   bool emitted_line_marker = false;
 342   int src_line = LOCATION_LINE (src_loc);
 343   const char *src_file = LOCATION_FILE (src_loc);
 344
 345   /* End the previous line of text.  */
 346   if (print.printed)
 347     {
 348       putc ('\n', stream);
 349       print.src_line++;
 350       print.printed = false;
 351     }
 352
 353   if (!flag_no_line_commands
 354       && src_line >= print.src_line
 355       && src_line < print.src_line + 8
 356       && strcmp (src_file, print.src_file) == 0)
 357     {
 358       while (src_line > print.src_line)
 359         {
 360           putc ('\n', stream);
 361           print.src_line++;
 362         }
 363     }
 364   else
 365     emitted_line_marker = print_line_1 (src_loc, "", stream);
 366
 367   return emitted_line_marker;
 368 }
 369
 370 /* If the token read on logical line LINE needs to be output on a
 371    different line to the current one, output the required newlines or
 372    a line marker.  If a line marker was emitted, return TRUE otherwise
 373    return FALSE.  */
 374
 375 static bool
 376 maybe_print_line (location_t src_loc)
 377 {
 378   if (cpp_get_options (parse_in)->debug)
 379     linemap_dump_location (line_table, src_loc,
 380                            print.outf);
 381   return maybe_print_line_1 (src_loc, print.outf);
 382 }
 383
 384 /* Output a line marker for logical line LINE.  Special flags are "1"
 385    or "2" indicating entering or leaving a file.  If the line marker
 386    was effectively emitted, return TRUE otherwise return FALSE.  */
 387
 388 static bool
 389 print_line_1 (location_t src_loc, const char *special_flags, FILE *stream)
 390 {
 391   bool emitted_line_marker = false;
 392
 393   /* End any previous line of text.  */
 394   if (print.printed)
 395     putc ('\n', stream);
 396   print.printed = false;
 397
 398   if (!flag_no_line_commands)
 399     {
 400       const char *file_path = LOCATION_FILE (src_loc);
 401       int sysp;
 402       size_t to_file_len = strlen (file_path);
 403       unsigned char *to_file_quoted =
 404          (unsigned char *) alloca (to_file_len * 4 + 1);
 405       unsigned char *p;
 406
 407       print.src_line = LOCATION_LINE (src_loc);
 408       print.src_file = file_path;
 409
 410       /* cpp_quote_string does not nul-terminate, so we have to do it
 411          ourselves.  */
 412       p = cpp_quote_string (to_file_quoted,
 413                             (const unsigned char *) file_path,
 414                             to_file_len);
 415       *p = '\0';
 416       fprintf (stream, "# %u \"%s\"%s",
 417                print.src_line == 0 ? 1 : print.src_line,
 418                to_file_quoted, special_flags);
 419
 420       sysp = in_system_header_at (src_loc);
 421       if (sysp == 2)
 422         fputs (" 3 4", stream);
 423       else if (sysp == 1)
 424         fputs (" 3", stream);
 425
 426       putc ('\n', stream);
 427       emitted_line_marker = true;
 428     }
 429
 430   return emitted_line_marker;
 431 }
 432
 433 /* Output a line marker for logical line LINE.  Special flags are "1"
 434    or "2" indicating entering or leaving a file.  Return TRUE if a
 435    line marker was effectively emitted, FALSE otherwise.  */
 436
 437 static bool
 438 print_line (location_t src_loc, const char *special_flags)
 439 {
 440     if (cpp_get_options (parse_in)->debug)
 441       linemap_dump_location (line_table, src_loc,
 442                              print.outf);
 443     return print_line_1 (src_loc, special_flags, print.outf);
 444 }
 445
 446 /* Helper function for cb_line_change and scan_translation_unit.
 447    Return TRUE if a line marker is emitted, FALSE otherwise.  */
 448 static bool
 449 do_line_change (cpp_reader *pfile, const cpp_token *token,
 450                 location_t src_loc, int parsing_args)
 451 {
 452   bool emitted_line_marker = false;
 453   if (define_queue || undef_queue)
 454     dump_queued_macros (pfile);
 455
 456   if (token->type == CPP_EOF || parsing_args)
 457     return false;
 458
 459   emitted_line_marker = maybe_print_line (src_loc);
 460   print.prev = 0;
 461   print.source = 0;
 462
 463   /* Supply enough spaces to put this token in its original column,
 464      one space per column greater than 2, since scan_translation_unit
 465      will provide a space if PREV_WHITE.  Don't bother trying to
 466      reconstruct tabs; we can't get it right in general, and nothing
 467      ought to care.  Some things do care; the fault lies with them.  */
 468   if (!CPP_OPTION (pfile, traditional))
 469     {
 470       int spaces = LOCATION_COLUMN (src_loc) - 2;
 471       print.printed = true;
 472
 473       while (-- spaces >= 0)
 474         putc (' ', print.outf);
 475     }
 476
 477   return emitted_line_marker;
 478 }
 479
 480 /* Called when a line of output is started.  TOKEN is the first token
 481    of the line, and at end of file will be CPP_EOF.  */
 482 static void
 483 cb_line_change (cpp_reader *pfile, const cpp_token *token,
 484                 int parsing_args)
 485 {
 486   do_line_change (pfile, token, token->src_loc, parsing_args);
 487 }
 488
 489 static void
 490 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, location_t line,
 491           const cpp_string *str)
 492 {
 493   maybe_print_line (line);
 494   fprintf (print.outf, "#ident %s\n", str->text);
 495   print.src_line++;
 496 }
 497
 498 static void
 499 cb_define (cpp_reader *pfile, location_t line, cpp_hashnode *node)
 500 {
 501   const line_map_ordinary *map;
 502
 503   maybe_print_line (line);
 504   fputs ("#define ", print.outf);
 505
 506   /* 'D' is whole definition; 'N' is name only.  */
 507   if (flag_dump_macros == 'D')
 508     fputs ((const char *) cpp_macro_definition (pfile, node),
 509            print.outf);
 510   else
 511     fputs ((const char *) NODE_NAME (node), print.outf);
 512
 513   putc ('\n', print.outf);
 514   print.printed = false;
 515   linemap_resolve_location (line_table, line,
 516                             LRK_MACRO_DEFINITION_LOCATION,
 517                             &map);
 518   if (LINEMAP_LINE (map) != 0)
 519     print.src_line++;
 520 }
 521
 522 static void
 523 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, location_t line,
 524           cpp_hashnode *node)
 525 {
 526   maybe_print_line (line);
 527   fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
 528   print.src_line++;
 529 }
 530
 531 static void
 532 cb_used_define (cpp_reader *pfile, location_t line ATTRIBUTE_UNUSED,
 533                 cpp_hashnode *node)
 534 {
 535   if (cpp_user_macro_p (node))
 536     {
 537       macro_queue *q;
 538       q = XNEW (macro_queue);
 539       q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
 540       q->next = define_queue;
 541       define_queue = q;
 542     }
 543 }
 544
 545 static void
 546 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
 547                location_t line ATTRIBUTE_UNUSED,
 548                cpp_hashnode *node)
 549 {
 550   macro_queue *q;
 551   q = XNEW (macro_queue);
 552   q->macro = xstrdup ((const char *) NODE_NAME (node));
 553   q->next = undef_queue;
 554   undef_queue = q;
 555 }
 556
 557 static void
 558 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
 559 {
 560   macro_queue *q;
 561
 562   /* End the previous line of text.  */
 563   if (print.printed)
 564     {
 565       putc ('\n', print.outf);
 566       print.src_line++;
 567       print.printed = false;
 568     }
 569
 570   for (q = define_queue; q;)
 571     {
 572       macro_queue *oq;
 573       fputs ("#define ", print.outf);
 574       fputs (q->macro, print.outf);
 575       putc ('\n', print.outf);
 576       print.printed = false;
 577       print.src_line++;
 578       oq = q;
 579       q = q->next;
 580       free (oq->macro);
 581       free (oq);
 582     }
 583   define_queue = NULL;
 584   for (q = undef_queue; q;)
 585     {
 586       macro_queue *oq;
 587       fprintf (print.outf, "#undef %s\n", q->macro);
 588       print.src_line++;
 589       oq = q;
 590       q = q->next;
 591       free (oq->macro);
 592       free (oq);
 593     }
 594   undef_queue = NULL;
 595 }
 596
 597 static void
 598 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, location_t line,
 599             const unsigned char *dir, const char *header, int angle_brackets,
 600             const cpp_token **comments)
 601 {
 602   maybe_print_line (line);
 603   if (angle_brackets)
 604     fprintf (print.outf, "#%s <%s>", dir, header);
 605   else
 606     fprintf (print.outf, "#%s \"%s\"", dir, header);
 607
 608   if (comments != NULL)
 609     {
 610       while (*comments != NULL)
 611         {
 612           if ((*comments)->flags & PREV_WHITE)
 613             putc (' ', print.outf);
 614           cpp_output_token (*comments, print.outf);
 615           ++comments;
 616         }
 617     }
 618
 619   putc ('\n', print.outf);
 620   print.printed = false;
 621   print.src_line++;
 622 }
 623
 624 /* Callback called when -fworking-director and -E to emit working
 625    directory in cpp output file.  */
 626
 627 void
 628 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
 629 {
 630   size_t to_file_len = strlen (dir);
 631   unsigned char *to_file_quoted =
 632      (unsigned char *) alloca (to_file_len * 4 + 1);
 633   unsigned char *p;
 634
 635   /* cpp_quote_string does not nul-terminate, so we have to do it ourselves.  */
 636   p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
 637   *p = '\0';
 638   fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
 639 }
 640
 641 /* The file name, line number or system header flags have changed, as
 642    described in MAP.  */
 643
 644 void
 645 pp_file_change (const line_map_ordinary *map)
 646 {
 647   const char *flags = "";
 648
 649   if (flag_no_line_commands)
 650     return;
 651
 652   if (map != NULL)
 653     {
 654       input_location = map->start_location;
 655       if (print.first_time)
 656         {
 657           /* Avoid printing foo.i when the main file is foo.c.  */
 658           if (!cpp_get_options (parse_in)->preprocessed)
 659             print_line (map->start_location, flags);
 660           print.first_time = 0;
 661         }
 662       else
 663         {
 664           /* Bring current file to correct line when entering a new file.  */
 665           if (map->reason == LC_ENTER)
 666             {
 667               maybe_print_line (linemap_included_from (map));
 668               flags = " 1";
 669             }
 670           else if (map->reason == LC_LEAVE)
 671             flags = " 2";
 672           print_line (map->start_location, flags);
 673         }
 674     }
 675 }
 676
 677 /* Copy a #pragma directive to the preprocessed output.  */
 678 static void
 679 cb_def_pragma (cpp_reader *pfile, location_t line)
 680 {
 681   maybe_print_line (line);
 682   fputs ("#pragma ", print.outf);
 683   cpp_output_line (pfile, print.outf);
 684   print.printed = false;
 685   print.src_line++;
 686 }
 687
 688 /* Dump out the hash table.  */
 689 static int
 690 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
 691 {
 692   if (cpp_user_macro_p (node))
 693     {
 694       fputs ("#define ", print.outf);
 695       fputs ((const char *) cpp_macro_definition (pfile, node),
 696              print.outf);
 697       putc ('\n', print.outf);
 698       print.printed = false;
 699       print.src_line++;
 700     }
 701
 702   return 1;
 703 }
 704
 705 /* Load in the PCH file NAME, open on FD.  It was originally searched for
 706    by ORIG_NAME.  Also, print out a #include command so that the PCH
 707    file can be loaded when the preprocessed output is compiled.  */
 708
 709 static void
 710 cb_read_pch (cpp_reader *pfile, const char *name,
 711              int fd, const char *orig_name ATTRIBUTE_UNUSED)
 712 {
 713   c_common_read_pch (pfile, name, fd, orig_name);
 714
 715   fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
 716   print.src_line++;
 717 }