gcc/tlink.c

   1 /* Scan linker error messages for missing template instantiations and provide
   2    them.
   3
   4    Copyright (C) 1995, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007, 2008
   5    Free Software Foundation, Inc.
   6    Contributed by Jason Merrill (jason@cygnus.com).
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify it under
  11 the terms of the GNU General Public License as published by the Free
  12 Software Foundation; either version 3, or (at your option) any later
  13 version.
  14
  15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18 for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "tm.h"
  28 #include "intl.h"
  29 #include "obstack.h"
  30 #include "hashtab.h"
  31 #include "demangle.h"
  32 #include "collect2.h"
  33 #include "libiberty.h"
  34
  35 #define MAX_ITERATIONS 17
  36
  37 /* Defined in the automatically-generated underscore.c.  */
  38 extern int prepends_underscore;
  39
  40 static int tlink_verbose;
  41
  42 static char *initial_cwd;
  43 \f
  44 /* Hash table boilerplate for working with htab_t.  We have hash tables
  45    for symbol names, file names, and demangled symbols.  */
  46
  47 typedef struct symbol_hash_entry
  48 {
  49   const char *key;
  50   struct file_hash_entry *file;
  51   int chosen;
  52   int tweaking;
  53   int tweaked;
  54 } symbol;
  55
  56 typedef struct file_hash_entry
  57 {
  58   const char *key;
  59   const char *args;
  60   const char *dir;
  61   const char *main;
  62   int tweaking;
  63 } file;
  64
  65 typedef struct demangled_hash_entry
  66 {
  67   const char *key;
  68   const char *mangled;
  69 } demangled;
  70
  71 /* Hash and comparison functions for these hash tables.  */
  72
  73 static int hash_string_eq (const void *, const void *);
  74 static hashval_t hash_string_hash (const void *);
  75
  76 static int
  77 hash_string_eq (const void *s1_p, const void *s2_p)
  78 {
  79   const char *const *s1 = (const char *const *) s1_p;
  80   const char *s2 = (const char *) s2_p;
  81   return strcmp (*s1, s2) == 0;
  82 }
  83
  84 static hashval_t
  85 hash_string_hash (const void *s_p)
  86 {
  87   const char *const *s = (const char *const *) s_p;
  88   return (*htab_hash_string) (*s);
  89 }
  90
  91 static htab_t symbol_table;
  92
  93 static struct symbol_hash_entry * symbol_hash_lookup (const char *, int);
  94 static struct file_hash_entry * file_hash_lookup (const char *);
  95 static struct demangled_hash_entry *demangled_hash_lookup (const char *, int);
  96 static void symbol_push (symbol *);
  97 static symbol * symbol_pop (void);
  98 static void file_push (file *);
  99 static file * file_pop (void);
 100 static void tlink_init (void);
 101 static int tlink_execute (const char *, char **, const char *, const char *);
 102 static char * frob_extension (const char *, const char *);
 103 static char * obstack_fgets (FILE *, struct obstack *);
 104 static char * tfgets (FILE *);
 105 static char * pfgets (FILE *);
 106 static void freadsym (FILE *, file *, int);
 107 static void read_repo_file (file *);
 108 static void maybe_tweak (char *, file *);
 109 static int recompile_files (void);
 110 static int read_repo_files (char **);
 111 static void demangle_new_symbols (void);
 112 static int scan_linker_output (const char *);
 113
 114 /* Look up an entry in the symbol hash table.  */
 115
 116 static struct symbol_hash_entry *
 117 symbol_hash_lookup (const char *string, int create)
 118 {
 119   void **e;
 120   e = htab_find_slot_with_hash (symbol_table, string,
 121                                 (*htab_hash_string) (string),
 122                                 create ? INSERT : NO_INSERT);
 123   if (e == NULL)
 124     return NULL;
 125   if (*e == NULL)
 126     {
 127       struct symbol_hash_entry *v;
 128       *e = v = XCNEW (struct symbol_hash_entry);
 129       v->key = xstrdup (string);
 130     }
 131   return (struct symbol_hash_entry *) *e;
 132 }
 133
 134 static htab_t file_table;
 135
 136 /* Look up an entry in the file hash table.  */
 137
 138 static struct file_hash_entry *
 139 file_hash_lookup (const char *string)
 140 {
 141   void **e;
 142   e = htab_find_slot_with_hash (file_table, string,
 143                                 (*htab_hash_string) (string),
 144                                 INSERT);
 145   if (*e == NULL)
 146     {
 147       struct file_hash_entry *v;
 148       *e = v = XCNEW (struct file_hash_entry);
 149       v->key = xstrdup (string);
 150     }
 151   return (struct file_hash_entry *) *e;
 152 }
 153
 154 static htab_t demangled_table;
 155
 156 /* Look up an entry in the demangled name hash table.  */
 157
 158 static struct demangled_hash_entry *
 159 demangled_hash_lookup (const char *string, int create)
 160 {
 161   void **e;
 162   e = htab_find_slot_with_hash (demangled_table, string,
 163                                 (*htab_hash_string) (string),
 164                                 create ? INSERT : NO_INSERT);
 165   if (e == NULL)
 166     return NULL;
 167   if (*e == NULL)
 168     {
 169       struct demangled_hash_entry *v;
 170       *e = v = XCNEW (struct demangled_hash_entry);
 171       v->key = xstrdup (string);
 172     }
 173   return (struct demangled_hash_entry *) *e;
 174 }
 175 \f
 176 /* Stack code.  */
 177
 178 struct symbol_stack_entry
 179 {
 180   symbol *value;
 181   struct symbol_stack_entry *next;
 182 };
 183 struct obstack symbol_stack_obstack;
 184 struct symbol_stack_entry *symbol_stack;
 185
 186 struct file_stack_entry
 187 {
 188   file *value;
 189   struct file_stack_entry *next;
 190 };
 191 struct obstack file_stack_obstack;
 192 struct file_stack_entry *file_stack;
 193
 194 static void
 195 symbol_push (symbol *p)
 196 {
 197   struct symbol_stack_entry *ep
 198     = XOBNEW (&symbol_stack_obstack, struct symbol_stack_entry);
 199   ep->value = p;
 200   ep->next = symbol_stack;
 201   symbol_stack = ep;
 202 }
 203
 204 static symbol *
 205 symbol_pop (void)
 206 {
 207   struct symbol_stack_entry *ep = symbol_stack;
 208   symbol *p;
 209   if (ep == NULL)
 210     return NULL;
 211   p = ep->value;
 212   symbol_stack = ep->next;
 213   obstack_free (&symbol_stack_obstack, ep);
 214   return p;
 215 }
 216
 217 static void
 218 file_push (file *p)
 219 {
 220   struct file_stack_entry *ep;
 221
 222   if (p->tweaking)
 223     return;
 224
 225   ep = XOBNEW (&file_stack_obstack, struct file_stack_entry);
 226   ep->value = p;
 227   ep->next = file_stack;
 228   file_stack = ep;
 229   p->tweaking = 1;
 230 }
 231
 232 static file *
 233 file_pop (void)
 234 {
 235   struct file_stack_entry *ep = file_stack;
 236   file *p;
 237   if (ep == NULL)
 238     return NULL;
 239   p = ep->value;
 240   file_stack = ep->next;
 241   obstack_free (&file_stack_obstack, ep);
 242   p->tweaking = 0;
 243   return p;
 244 }
 245 \f
 246 /* Other machinery.  */
 247
 248 /* Initialize the tlink machinery.  Called from do_tlink.  */
 249
 250 static void
 251 tlink_init (void)
 252 {
 253   const char *p;
 254
 255   symbol_table = htab_create (500, hash_string_hash, hash_string_eq,
 256                               NULL);
 257   file_table = htab_create (500, hash_string_hash, hash_string_eq,
 258                             NULL);
 259   demangled_table = htab_create (500, hash_string_hash, hash_string_eq,
 260                                  NULL);
 261
 262   obstack_begin (&symbol_stack_obstack, 0);
 263   obstack_begin (&file_stack_obstack, 0);
 264
 265   p = getenv ("TLINK_VERBOSE");
 266   if (p)
 267     tlink_verbose = atoi (p);
 268   else
 269     {
 270       tlink_verbose = 1;
 271       if (vflag)
 272         tlink_verbose = 2;
 273       if (debug)
 274         tlink_verbose = 3;
 275     }
 276
 277   initial_cwd = getpwd ();
 278 }
 279
 280 static int
 281 tlink_execute (const char *prog, char **argv, const char *outname,
 282                const char *errname)
 283 {
 284   struct pex_obj *pex;
 285
 286   pex = collect_execute (prog, argv, outname, errname, PEX_LAST | PEX_SEARCH);
 287   return collect_wait (prog, pex);
 288 }
 289
 290 static char *
 291 frob_extension (const char *s, const char *ext)
 292 {
 293   const char *p = strrchr (s, '/');
 294   if (! p)
 295     p = s;
 296   p = strrchr (p, '.');
 297   if (! p)
 298     p = s + strlen (s);
 299
 300   obstack_grow (&temporary_obstack, s, p - s);
 301   return (char *) obstack_copy0 (&temporary_obstack, ext, strlen (ext));
 302 }
 303
 304 static char *
 305 obstack_fgets (FILE *stream, struct obstack *ob)
 306 {
 307   int c;
 308   while ((c = getc (stream)) != EOF && c != '\n')
 309     obstack_1grow (ob, c);
 310   if (obstack_object_size (ob) == 0)
 311     return NULL;
 312   obstack_1grow (ob, '\0');
 313   return XOBFINISH (ob, char *);
 314 }
 315
 316 static char *
 317 tfgets (FILE *stream)
 318 {
 319   return obstack_fgets (stream, &temporary_obstack);
 320 }
 321
 322 static char *
 323 pfgets (FILE *stream)
 324 {
 325   return xstrdup (tfgets (stream));
 326 }
 327 \f
 328 /* Real tlink code.  */
 329
 330 /* Subroutine of read_repo_file.  We are reading the repo file for file F,
 331    which is coming in on STREAM, and the symbol that comes next in STREAM
 332    is offered, chosen or provided if CHOSEN is 0, 1 or 2, respectively.
 333
 334    XXX "provided" is unimplemented, both here and in the compiler.  */
 335
 336 static void
 337 freadsym (FILE *stream, file *f, int chosen)
 338 {
 339   symbol *sym;
 340
 341   {
 342     const char *name = tfgets (stream);
 343     sym = symbol_hash_lookup (name, true);
 344   }
 345
 346   if (sym->file == NULL)
 347     {
 348       /* We didn't have this symbol already, so we choose this file.  */
 349
 350       symbol_push (sym);
 351       sym->file = f;
 352       sym->chosen = chosen;
 353     }
 354   else if (chosen)
 355     {
 356       /* We want this file; cast aside any pretender.  */
 357
 358       if (sym->chosen && sym->file != f)
 359         {
 360           if (sym->chosen == 1)
 361             file_push (sym->file);
 362           else
 363             {
 364               file_push (f);
 365               f = sym->file;
 366               chosen = sym->chosen;
 367             }
 368         }
 369       sym->file = f;
 370       sym->chosen = chosen;
 371     }
 372 }
 373
 374 /* Read in the repo file denoted by F, and record all its information.  */
 375
 376 static void
 377 read_repo_file (file *f)
 378 {
 379   char c;
 380   FILE *stream = fopen (f->key, "r");
 381
 382   if (tlink_verbose >= 2)
 383     fprintf (stderr, _("collect: reading %s\n"), f->key);
 384
 385   while (fscanf (stream, "%c ", &c) == 1)
 386     {
 387       switch (c)
 388         {
 389         case 'A':
 390           f->args = pfgets (stream);
 391           break;
 392         case 'D':
 393           f->dir = pfgets (stream);
 394           break;
 395         case 'M':
 396           f->main = pfgets (stream);
 397           break;
 398         case 'P':
 399           freadsym (stream, f, 2);
 400           break;
 401         case 'C':
 402           freadsym (stream, f, 1);
 403           break;
 404         case 'O':
 405           freadsym (stream, f, 0);
 406           break;
 407         }
 408       obstack_free (&temporary_obstack, temporary_firstobj);
 409     }
 410   fclose (stream);
 411   if (f->args == NULL)
 412     f->args = getenv ("COLLECT_GCC_OPTIONS");
 413   if (f->dir == NULL)
 414     f->dir = ".";
 415 }
 416
 417 /* We might want to modify LINE, which is a symbol line from file F.  We do
 418    this if either we saw an error message referring to the symbol in
 419    question, or we have already allocated the symbol to another file and
 420    this one wants to emit it as well.  */
 421
 422 static void
 423 maybe_tweak (char *line, file *f)
 424 {
 425   symbol *sym = symbol_hash_lookup (line + 2, false);
 426
 427   if ((sym->file == f && sym->tweaking)
 428       || (sym->file != f && line[0] == 'C'))
 429     {
 430       sym->tweaking = 0;
 431       sym->tweaked = 1;
 432
 433       if (line[0] == 'O')
 434         line[0] = 'C';
 435       else
 436         line[0] = 'O';
 437     }
 438 }
 439
 440 /* Update the repo files for each of the object files we have adjusted and
 441    recompile.  */
 442
 443 static int
 444 recompile_files (void)
 445 {
 446   file *f;
 447
 448   putenv (xstrdup ("COMPILER_PATH="));
 449   putenv (xstrdup ("LIBRARY_PATH="));
 450
 451   while ((f = file_pop ()) != NULL)
 452     {
 453       char *line;
 454       const char *p, *q;
 455       char **argv;
 456       struct obstack arg_stack;
 457       FILE *stream = fopen (f->key, "r");
 458       const char *const outname = frob_extension (f->key, ".rnw");
 459       FILE *output = fopen (outname, "w");
 460
 461       while ((line = tfgets (stream)) != NULL)
 462         {
 463           switch (line[0])
 464             {
 465             case 'C':
 466             case 'O':
 467               maybe_tweak (line, f);
 468             }
 469           fprintf (output, "%s\n", line);
 470         }
 471       fclose (stream);
 472       fclose (output);
 473       /* On Windows "rename" returns -1 and sets ERRNO to EACCESS if
 474          the new file name already exists.  Therefore, we explicitly
 475          remove the old file first.  */
 476       if (remove (f->key) == -1)
 477         fatal_perror ("removing .rpo file");
 478       if (rename (outname, f->key) == -1)
 479         fatal_perror ("renaming .rpo file");
 480
 481       if (!f->args)
 482         {
 483           error ("repository file '%s' does not contain command-line "
 484                  "arguments", f->key);
 485           return 0;
 486         }
 487
 488       /* Build a null-terminated argv array suitable for
 489          tlink_execute().  Manipulate arguments on the arg_stack while
 490          building argv on the temporary_obstack.  */
 491
 492       obstack_init (&arg_stack);
 493       obstack_ptr_grow (&temporary_obstack, c_file_name);
 494
 495       for (p = f->args; *p != '\0'; p = q + 1)
 496         {
 497           /* Arguments are delimited by single-quotes.  Find the
 498              opening quote.  */
 499           p = strchr (p, '\'');
 500           if (!p)
 501             goto done;
 502
 503           /* Find the closing quote.  */
 504           q = strchr (p + 1, '\'');
 505           if (!q)
 506             goto done;
 507
 508           obstack_grow (&arg_stack, p + 1, q - (p + 1));
 509
 510           /* Replace '\'' with '.  This is how set_collect_gcc_options
 511              encodes a single-quote.  */
 512           while (q[1] == '\\' && q[2] == '\'' && q[3] == '\'')
 513             {
 514               const char *r;
 515
 516               r = strchr (q + 4, '\'');
 517               if (!r)
 518                 goto done;
 519
 520               obstack_grow (&arg_stack, q + 3, r - (q + 3));
 521               q = r;
 522             }
 523
 524           obstack_1grow (&arg_stack, '\0');
 525           obstack_ptr_grow (&temporary_obstack, obstack_finish (&arg_stack));
 526         }
 527     done:
 528       obstack_ptr_grow (&temporary_obstack, f->main);
 529       obstack_ptr_grow (&temporary_obstack, NULL);
 530       argv = XOBFINISH (&temporary_obstack, char **);
 531
 532       if (tlink_verbose)
 533         fprintf (stderr, _("collect: recompiling %s\n"), f->main);
 534
 535       if (chdir (f->dir) != 0
 536           || tlink_execute (c_file_name, argv, NULL, NULL) != 0
 537           || chdir (initial_cwd) != 0)
 538         return 0;
 539
 540       read_repo_file (f);
 541
 542       obstack_free (&arg_stack, NULL);
 543       obstack_free (&temporary_obstack, temporary_firstobj);
 544     }
 545   return 1;
 546 }
 547
 548 /* The first phase of processing: determine which object files have
 549    .rpo files associated with them, and read in the information.  */
 550
 551 static int
 552 read_repo_files (char **object_lst)
 553 {
 554   char **object = object_lst;
 555
 556   for (; *object; object++)
 557     {
 558       const char *p;
 559       file *f;
 560
 561       /* Don't bother trying for ld flags.  */
 562       if (*object[0] == '-')
 563         continue;
 564
 565       p = frob_extension (*object, ".rpo");
 566
 567       if (! file_exists (p))
 568         continue;
 569
 570       f = file_hash_lookup (p);
 571
 572       read_repo_file (f);
 573     }
 574
 575   if (file_stack != NULL && ! recompile_files ())
 576     return 0;
 577
 578   return (symbol_stack != NULL);
 579 }
 580
 581 /* Add the demangled forms of any new symbols to the hash table.  */
 582
 583 static void
 584 demangle_new_symbols (void)
 585 {
 586   symbol *sym;
 587
 588   while ((sym = symbol_pop ()) != NULL)
 589     {
 590       demangled *dem;
 591       const char *p = cplus_demangle (sym->key, DMGL_PARAMS | DMGL_ANSI);
 592
 593       if (! p)
 594         continue;
 595
 596       dem = demangled_hash_lookup (p, true);
 597       dem->mangled = sym->key;
 598     }
 599 }
 600
 601 /* Step through the output of the linker, in the file named FNAME, and
 602    adjust the settings for each symbol encountered.  */
 603
 604 static int
 605 scan_linker_output (const char *fname)
 606 {
 607   FILE *stream = fopen (fname, "r");
 608   char *line;
 609   int skip_next_in_line = 0;
 610
 611   while ((line = tfgets (stream)) != NULL)
 612     {
 613       char *p = line, *q;
 614       symbol *sym;
 615       int end;
 616       int ok = 0;
 617
 618       /* On darwin9, we might have to skip " in " lines as well.  */
 619       if (skip_next_in_line
 620           && strstr (p, " in "))
 621           continue;
 622       skip_next_in_line = 0;
 623
 624       while (*p && ISSPACE ((unsigned char) *p))
 625         ++p;
 626
 627       if (! *p)
 628         continue;
 629
 630       for (q = p; *q && ! ISSPACE ((unsigned char) *q); ++q)
 631         ;
 632
 633       /* Try the first word on the line.  */
 634       if (*p == '.')
 635         ++p;
 636       if (!strncmp (p, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)))
 637         p += strlen (USER_LABEL_PREFIX);
 638
 639       end = ! *q;
 640       *q = 0;
 641       sym = symbol_hash_lookup (p, false);
 642
 643       /* Some SVR4 linkers produce messages like
 644          ld: 0711-317 ERROR: Undefined symbol: .g__t3foo1Zi
 645          */
 646       if (! sym && ! end && strstr (q + 1, "Undefined symbol: "))
 647         {
 648           char *p = strrchr (q + 1, ' ');
 649           p++;
 650           if (*p == '.')
 651             p++;
 652           if (!strncmp (p, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)))
 653             p += strlen (USER_LABEL_PREFIX);
 654           sym = symbol_hash_lookup (p, false);
 655         }
 656
 657       if (! sym && ! end)
 658         /* Try a mangled name in quotes.  */
 659         {
 660           char *oldq = q + 1;
 661           demangled *dem = 0;
 662           q = 0;
 663
 664           /* On darwin9, we look for "foo" referenced from:\n\(.* in .*\n\)*  */
 665           if (strcmp (oldq, "referenced from:") == 0)
 666             {
 667               /* We have to remember that we found a symbol to tweak.  */
 668               ok = 1;
 669
 670               /* We actually want to start from the first word on the
 671                  line.  */
 672               oldq = p;
 673
 674               /* Since the format is multiline, we have to skip
 675                  following lines with " in ".  */
 676               skip_next_in_line = 1;
 677             }
 678
 679           /* First try `GNU style'.  */
 680           p = strchr (oldq, '`');
 681           if (p)
 682             p++, q = strchr (p, '\'');
 683           /* Then try "double quotes".  */
 684           else if (p = strchr (oldq, '"'), p)
 685             p++, q = strchr (p, '"');
 686           /* Then try 'single quotes'.  */
 687           else if (p = strchr (oldq, '\''), p)
 688             p++, q = strchr (p, '\'');
 689           else {
 690             /* Then try entire line.  */
 691             q = strchr (oldq, 0);
 692             if (q != oldq)
 693               p = (char *)oldq;
 694           }
 695
 696           if (p)
 697             {
 698               /* Don't let the strstr's below see the demangled name; we
 699                  might get spurious matches.  */
 700               p[-1] = '\0';
 701
 702               /* powerpc64-linux references .foo when calling function foo.  */
 703               if (*p == '.')
 704                 p++;
 705             }
 706
 707           /* We need to check for certain error keywords here, or we would
 708              mistakenly use GNU ld's "In function `foo':" message.  */
 709           if (q && (ok
 710                     || strstr (oldq, "ndefined")
 711                     || strstr (oldq, "nresolved")
 712                     || strstr (oldq, "nsatisfied")
 713                     || strstr (oldq, "ultiple")))
 714             {
 715               *q = 0;
 716               dem = demangled_hash_lookup (p, false);
 717               if (dem)
 718                 sym = symbol_hash_lookup (dem->mangled, false);
 719               else
 720                 {
 721                   if (!strncmp (p, USER_LABEL_PREFIX,
 722                                 strlen (USER_LABEL_PREFIX)))
 723                     p += strlen (USER_LABEL_PREFIX);
 724                   sym = symbol_hash_lookup (p, false);
 725                 }
 726             }
 727         }
 728
 729       if (sym && sym->tweaked)
 730         {
 731           error ("'%s' was assigned to '%s', but was not defined "
 732                  "during recompilation, or vice versa",
 733                  sym->key, sym->file->key);
 734           fclose (stream);
 735           return 0;
 736         }
 737       if (sym && !sym->tweaking)
 738         {
 739           if (tlink_verbose >= 2)
 740             fprintf (stderr, _("collect: tweaking %s in %s\n"),
 741                      sym->key, sym->file->key);
 742           sym->tweaking = 1;
 743           file_push (sym->file);
 744         }
 745
 746       obstack_free (&temporary_obstack, temporary_firstobj);
 747     }
 748
 749   fclose (stream);
 750   return (file_stack != NULL);
 751 }
 752
 753 /* Entry point for tlink.  Called from main in collect2.c.
 754
 755    Iteratively try to provide definitions for all the unresolved symbols
 756    mentioned in the linker error messages.
 757
 758    LD_ARGV is an array of arguments for the linker.
 759    OBJECT_LST is an array of object files that we may be able to recompile
 760      to provide missing definitions.  Currently ignored.  */
 761
 762 void
 763 do_tlink (char **ld_argv, char **object_lst ATTRIBUTE_UNUSED)
 764 {
 765   int exit = tlink_execute ("ld", ld_argv, ldout, lderrout);
 766
 767   tlink_init ();
 768
 769   if (exit)
 770     {
 771       int i = 0;
 772
 773       /* Until collect does a better job of figuring out which are object
 774          files, assume that everything on the command line could be.  */
 775       if (read_repo_files (ld_argv))
 776         while (exit && i++ < MAX_ITERATIONS)
 777           {
 778             if (tlink_verbose >= 3)
 779               {
 780                 dump_file (ldout, stdout);
 781                 dump_file (lderrout, stderr);
 782               }
 783             demangle_new_symbols ();
 784             if (! scan_linker_output (ldout)
 785                 && ! scan_linker_output (lderrout))
 786               break;
 787             if (! recompile_files ())
 788               break;
 789             if (tlink_verbose)
 790               fprintf (stderr, _("collect: relinking\n"));
 791             exit = tlink_execute ("ld", ld_argv, ldout, lderrout);
 792           }
 793     }
 794
 795   dump_file (ldout, stdout);
 796   unlink (ldout);
 797   dump_file (lderrout, stderr);
 798   unlink (lderrout);
 799   if (exit)
 800     {
 801       error ("ld returned %d exit status", exit);
 802       collect_exit (exit);
 803     }
 804 }