commands.c

   1 /* Command processing for GNU Make.
   2 Copyright (C) 1988,89,91,92,93,94,95,96,97 Free Software Foundation, Inc.
   3 This file is part of GNU Make.
   4
   5 GNU Make is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU Make 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 GNU Make; see the file COPYING.  If not, write to
  17 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #include "make.h"
  21 #include "dep.h"
  22 #include "filedef.h"
  23 #include "variable.h"
  24 #include "job.h"
  25 #include "commands.h"
  26
  27 #if VMS
  28 # define FILE_LIST_SEPARATOR ','
  29 #else
  30 # define FILE_LIST_SEPARATOR ' '
  31 #endif
  32
  33 extern int remote_kill PARAMS ((int id, int sig));
  34
  35 #ifndef HAVE_UNISTD_H
  36 extern int getpid ();
  37 #endif
  38 \f
  39 /* Set FILE's automatic variables up.  */
  40
  41 static void
  42 set_file_variables (file)
  43      register struct file *file;
  44 {
  45   char *at, *percent, *star, *less;
  46
  47 #ifndef NO_ARCHIVES
  48   /* If the target is an archive member `lib(member)',
  49      then $@ is `lib' and $% is `member'.  */
  50
  51   if (ar_name (file->name))
  52     {
  53       unsigned int len;
  54       char *p;
  55
  56       p = strchr (file->name, '(');
  57       at = (char *) alloca (p - file->name + 1);
  58       bcopy (file->name, at, p - file->name);
  59       at[p - file->name] = '\0';
  60       len = strlen (p + 1);
  61       percent = (char *) alloca (len);
  62       bcopy (p + 1, percent, len - 1);
  63       percent[len - 1] = '\0';
  64     }
  65   else
  66 #endif  /* NO_ARCHIVES.  */
  67     {
  68       at = file->name;
  69       percent = "";
  70     }
  71
  72   /* $* is the stem from an implicit or static pattern rule.  */
  73   if (file->stem == 0)
  74     {
  75       /* In Unix make, $* is set to the target name with
  76          any suffix in the .SUFFIXES list stripped off for
  77          explicit rules.  We store this in the `stem' member.  */
  78       register struct dep *d;
  79       char *name;
  80       unsigned int len;
  81
  82 #ifndef NO_ARCHIVES
  83       if (ar_name (file->name))
  84         {
  85           name = strchr (file->name, '(') + 1;
  86           len = strlen (name) - 1;
  87         }
  88       else
  89 #endif
  90         {
  91           name = file->name;
  92           len = strlen (name);
  93         }
  94
  95       for (d = enter_file (".SUFFIXES")->deps; d != 0; d = d->next)
  96         {
  97           unsigned int slen = strlen (dep_name (d));
  98           if (len > slen && strneq (dep_name (d), name + (len - slen), slen))
  99             {
 100               file->stem = savestring (name, len - slen);
 101               break;
 102             }
 103         }
 104       if (d == 0)
 105         file->stem = "";
 106     }
 107   star = file->stem;
 108
 109   /* $< is the first dependency.  */
 110   less = file->deps != 0 ? dep_name (file->deps) : "";
 111
 112   if (file->cmds == default_file->cmds)
 113     /* This file got its commands from .DEFAULT.
 114        In this case $< is the same as $@.  */
 115     less = at;
 116
 117 #define DEFINE_VARIABLE(name, len, value) \
 118   (void) define_variable_for_file (name,len,value,o_automatic,0,file)
 119
 120   /* Define the variables.  */
 121
 122   DEFINE_VARIABLE ("<", 1, less);
 123   DEFINE_VARIABLE ("*", 1, star);
 124   DEFINE_VARIABLE ("@", 1, at);
 125   DEFINE_VARIABLE ("%", 1, percent);
 126
 127   /* Compute the values for $^, $+, $?, and $|.  */
 128
 129   {
 130     unsigned int qmark_len, plus_len, bar_len;
 131     char *caret_value, *plus_value;
 132     char *cp;
 133     char *qmark_value;
 134     char *bar_value;
 135     char *qp;
 136     char *bp;
 137     struct dep *d;
 138     unsigned int len;
 139
 140     /* Compute first the value for $+, which is supposed to contain
 141        duplicate dependencies as they were listed in the makefile.  */
 142
 143     plus_len = 0;
 144     for (d = file->deps; d != 0; d = d->next)
 145       if (! d->ignore_mtime)
 146         plus_len += strlen (dep_name (d)) + 1;
 147     if (plus_len == 0)
 148       plus_len++;
 149
 150     cp = plus_value = (char *) alloca (plus_len);
 151
 152     qmark_len = plus_len + 1;   /* Will be this or less.  */
 153     for (d = file->deps; d != 0; d = d->next)
 154       if (! d->ignore_mtime)
 155         {
 156           char *c = dep_name (d);
 157
 158 #ifndef NO_ARCHIVES
 159           if (ar_name (c))
 160             {
 161               c = strchr (c, '(') + 1;
 162               len = strlen (c) - 1;
 163             }
 164           else
 165 #endif
 166             len = strlen (c);
 167
 168           bcopy (c, cp, len);
 169           cp += len;
 170           *cp++ = FILE_LIST_SEPARATOR;
 171           if (! d->changed)
 172             qmark_len -= len + 1;       /* Don't space in $? for this one.  */
 173         }
 174
 175     /* Kill the last space and define the variable.  */
 176
 177     cp[cp > plus_value ? -1 : 0] = '\0';
 178     DEFINE_VARIABLE ("+", 1, plus_value);
 179
 180     /* Make sure that no dependencies are repeated.  This does not
 181        really matter for the purpose of updating targets, but it
 182        might make some names be listed twice for $^ and $?.  */
 183
 184     uniquize_deps (file->deps);
 185
 186     bar_len = 0;
 187     for (d = file->deps; d != 0; d = d->next)
 188       if (d->ignore_mtime)
 189         bar_len += strlen (dep_name (d)) + 1;
 190     if (bar_len == 0)
 191       bar_len++;
 192
 193     /* Compute the values for $^, $?, and $|.  */
 194
 195     cp = caret_value = plus_value; /* Reuse the buffer; it's big enough.  */
 196     qp = qmark_value = (char *) alloca (qmark_len);
 197     bp = bar_value = (char *) alloca (bar_len);
 198
 199     for (d = file->deps; d != 0; d = d->next)
 200       {
 201         char *c = dep_name (d);
 202
 203 #ifndef NO_ARCHIVES
 204         if (ar_name (c))
 205           {
 206             c = strchr (c, '(') + 1;
 207             len = strlen (c) - 1;
 208           }
 209         else
 210 #endif
 211           len = strlen (c);
 212
 213         if (d->ignore_mtime)
 214           {
 215             bcopy (c, bp, len);
 216             bp += len;
 217             *bp++ = FILE_LIST_SEPARATOR;
 218           }
 219         else
 220           {
 221             bcopy (c, cp, len);
 222             cp += len;
 223             *cp++ = FILE_LIST_SEPARATOR;
 224             if (d->changed)
 225               {
 226                 bcopy (c, qp, len);
 227                 qp += len;
 228                 *qp++ = FILE_LIST_SEPARATOR;
 229               }
 230           }
 231       }
 232
 233     /* Kill the last spaces and define the variables.  */
 234
 235     cp[cp > caret_value ? -1 : 0] = '\0';
 236     DEFINE_VARIABLE ("^", 1, caret_value);
 237
 238     qp[qp > qmark_value ? -1 : 0] = '\0';
 239     DEFINE_VARIABLE ("?", 1, qmark_value);
 240
 241     bp[bp > bar_value ? -1 : 0] = '\0';
 242     DEFINE_VARIABLE ("|", 1, bar_value);
 243   }
 244
 245 #undef  DEFINE_VARIABLE
 246 }
 247 \f
 248 /* Chop CMDS up into individual command lines if necessary.
 249    Also set the `lines_flags' and `any_recurse' members.  */
 250
 251 void
 252 chop_commands (cmds)
 253      register struct commands *cmds;
 254 {
 255   register char *p;
 256   unsigned int nlines, idx;
 257   char **lines;
 258
 259   /* If we don't have any commands,
 260      or we already parsed them, never mind.  */
 261
 262   if (!cmds || cmds->command_lines != 0)
 263     return;
 264
 265   /* Chop CMDS->commands up into lines in CMDS->command_lines.
 266          Also set the corresponding CMDS->lines_flags elements,
 267          and the CMDS->any_recurse flag.  */
 268
 269   nlines = 5;
 270   lines = (char **) xmalloc (5 * sizeof (char *));
 271   idx = 0;
 272   p = cmds->commands;
 273   while (*p != '\0')
 274     {
 275       char *end = p;
 276     find_end:;
 277       end = strchr (end, '\n');
 278       if (end == 0)
 279         end = p + strlen (p);
 280       else if (end > p && end[-1] == '\\')
 281         {
 282           int backslash = 1;
 283           register char *b;
 284           for (b = end - 2; b >= p && *b == '\\'; --b)
 285             backslash = !backslash;
 286           if (backslash)
 287             {
 288               ++end;
 289               goto find_end;
 290             }
 291         }
 292
 293       if (idx == nlines)
 294         {
 295           nlines += 2;
 296           lines = (char **) xrealloc ((char *) lines,
 297                                       nlines * sizeof (char *));
 298         }
 299       lines[idx++] = savestring (p, end - p);
 300       p = end;
 301       if (*p != '\0')
 302         ++p;
 303     }
 304
 305   if (idx != nlines)
 306     {
 307       nlines = idx;
 308       lines = (char **) xrealloc ((char *) lines,
 309                                   nlines * sizeof (char *));
 310     }
 311
 312   cmds->ncommand_lines = nlines;
 313   cmds->command_lines = lines;
 314
 315   cmds->any_recurse = 0;
 316   cmds->lines_flags = (char *) xmalloc (nlines);
 317   for (idx = 0; idx < nlines; ++idx)
 318     {
 319       int flags = 0;
 320
 321       for (p = lines[idx];
 322            isblank ((unsigned char)*p) || *p == '-' || *p == '@' || *p == '+';
 323            ++p)
 324         switch (*p)
 325           {
 326           case '+':
 327             flags |= COMMANDS_RECURSE;
 328             break;
 329           case '@':
 330             flags |= COMMANDS_SILENT;
 331             break;
 332           case '-':
 333             flags |= COMMANDS_NOERROR;
 334             break;
 335           }
 336       if (!(flags & COMMANDS_RECURSE))
 337         {
 338           unsigned int len = strlen (p);
 339           if (sindex (p, len, "$(MAKE)", 7) != 0
 340               || sindex (p, len, "${MAKE}", 7) != 0)
 341             flags |= COMMANDS_RECURSE;
 342         }
 343
 344       cmds->lines_flags[idx] = flags;
 345       cmds->any_recurse |= flags & COMMANDS_RECURSE;
 346     }
 347 }
 348 \f
 349 /* Execute the commands to remake FILE.  If they are currently executing,
 350    return or have already finished executing, just return.  Otherwise,
 351    fork off a child process to run the first command line in the sequence.  */
 352
 353 void
 354 execute_file_commands (file)
 355      struct file *file;
 356 {
 357   register char *p;
 358
 359   /* Don't go through all the preparations if
 360      the commands are nothing but whitespace.  */
 361
 362   for (p = file->cmds->commands; *p != '\0'; ++p)
 363     if (!isspace ((unsigned char)*p) && *p != '-' && *p != '@')
 364       break;
 365   if (*p == '\0')
 366     {
 367       /* If there are no commands, assume everything worked.  */
 368       set_command_state (file, cs_running);
 369       file->update_status = 0;
 370       notice_finished_file (file);
 371       return;
 372     }
 373
 374   /* First set the automatic variables according to this file.  */
 375
 376   initialize_file_variables (file, 0);
 377
 378   set_file_variables (file);
 379
 380   /* Start the commands running.  */
 381   new_job (file);
 382 }
 383 \f
 384 /* This is set while we are inside fatal_error_signal,
 385    so things can avoid nonreentrant operations.  */
 386
 387 int handling_fatal_signal = 0;
 388
 389 /* Handle fatal signals.  */
 390
 391 RETSIGTYPE
 392 fatal_error_signal (sig)
 393      int sig;
 394 {
 395 #ifdef __MSDOS__
 396   extern int dos_status, dos_command_running;
 397
 398   if (dos_command_running)
 399     {
 400       /* That was the child who got the signal, not us.  */
 401       dos_status |= (sig << 8);
 402       return;
 403     }
 404   remove_intermediates (1);
 405   exit (EXIT_FAILURE);
 406 #else /* not __MSDOS__ */
 407 #ifdef _AMIGA
 408   remove_intermediates (1);
 409   if (sig == SIGINT)
 410      fputs (_("*** Break.\n"), stderr);
 411
 412   exit (10);
 413 #else /* not Amiga */
 414   handling_fatal_signal = 1;
 415
 416   /* Set the handling for this signal to the default.
 417      It is blocked now while we run this handler.  */
 418   signal (sig, SIG_DFL);
 419
 420   /* A termination signal won't be sent to the entire
 421      process group, but it means we want to kill the children.  */
 422
 423   if (sig == SIGTERM)
 424     {
 425       register struct child *c;
 426       for (c = children; c != 0; c = c->next)
 427         if (!c->remote)
 428           (void) kill (c->pid, SIGTERM);
 429     }
 430
 431   /* If we got a signal that means the user
 432      wanted to kill make, remove pending targets.  */
 433
 434   if (sig == SIGTERM || sig == SIGINT
 435 #ifdef SIGHUP
 436     || sig == SIGHUP
 437 #endif
 438 #ifdef SIGQUIT
 439     || sig == SIGQUIT
 440 #endif
 441     )
 442     {
 443       register struct child *c;
 444
 445       /* Remote children won't automatically get signals sent
 446          to the process group, so we must send them.  */
 447       for (c = children; c != 0; c = c->next)
 448         if (c->remote)
 449           (void) remote_kill (c->pid, sig);
 450
 451       for (c = children; c != 0; c = c->next)
 452         delete_child_targets (c);
 453
 454       /* Clean up the children.  We don't just use the call below because
 455          we don't want to print the "Waiting for children" message.  */
 456       while (job_slots_used > 0)
 457         reap_children (1, 0);
 458     }
 459   else
 460     /* Wait for our children to die.  */
 461     while (job_slots_used > 0)
 462       reap_children (1, 1);
 463
 464   /* Delete any non-precious intermediate files that were made.  */
 465
 466   remove_intermediates (1);
 467
 468 #ifdef SIGQUIT
 469   if (sig == SIGQUIT)
 470     /* We don't want to send ourselves SIGQUIT, because it will
 471        cause a core dump.  Just exit instead.  */
 472     exit (EXIT_FAILURE);
 473 #endif
 474
 475   /* Signal the same code; this time it will really be fatal.  The signal
 476      will be unblocked when we return and arrive then to kill us.  */
 477   if (kill (getpid (), sig) < 0)
 478     pfatal_with_name ("kill");
 479 #endif /* not Amiga */
 480 #endif /* not __MSDOS__  */
 481 }
 482 \f
 483 /* Delete FILE unless it's precious or not actually a file (phony),
 484    and it has changed on disk since we last stat'd it.  */
 485
 486 static void
 487 delete_target (file, on_behalf_of)
 488      struct file *file;
 489      char *on_behalf_of;
 490 {
 491   struct stat st;
 492
 493   if (file->precious || file->phony)
 494     return;
 495
 496 #ifndef NO_ARCHIVES
 497   if (ar_name (file->name))
 498     {
 499       time_t file_date = (file->last_mtime == NONEXISTENT_MTIME
 500                           ? (time_t) -1
 501                           : (time_t) FILE_TIMESTAMP_S (file->last_mtime));
 502       if (ar_member_date (file->name) != file_date)
 503         {
 504           if (on_behalf_of)
 505             error (NILF, _("*** [%s] Archive member `%s' may be bogus; not deleted"),
 506                    on_behalf_of, file->name);
 507           else
 508             error (NILF, _("*** Archive member `%s' may be bogus; not deleted"),
 509                    file->name);
 510         }
 511       return;
 512     }
 513 #endif
 514
 515   if (stat (file->name, &st) == 0
 516       && S_ISREG (st.st_mode)
 517       && FILE_TIMESTAMP_STAT_MODTIME (file->name, st) != file->last_mtime)
 518     {
 519       if (on_behalf_of)
 520         error (NILF, _("*** [%s] Deleting file `%s'"), on_behalf_of, file->name);
 521       else
 522         error (NILF, _("*** Deleting file `%s'"), file->name);
 523       if (unlink (file->name) < 0
 524           && errno != ENOENT)   /* It disappeared; so what.  */
 525         perror_with_name ("unlink: ", file->name);
 526     }
 527 }
 528
 529
 530 /* Delete all non-precious targets of CHILD unless they were already deleted.
 531    Set the flag in CHILD to say they've been deleted.  */
 532
 533 void
 534 delete_child_targets (child)
 535      struct child *child;
 536 {
 537   struct dep *d;
 538
 539   if (child->deleted)
 540     return;
 541
 542   /* Delete the target file if it changed.  */
 543   delete_target (child->file, (char *) 0);
 544
 545   /* Also remove any non-precious targets listed in the `also_make' member.  */
 546   for (d = child->file->also_make; d != 0; d = d->next)
 547     delete_target (d->file, child->file->name);
 548
 549   child->deleted = 1;
 550 }
 551 \f
 552 /* Print out the commands in CMDS.  */
 553
 554 void
 555 print_commands (cmds)
 556      register struct commands *cmds;
 557 {
 558   register char *s;
 559
 560   fputs (_("#  commands to execute"), stdout);
 561
 562   if (cmds->fileinfo.filenm == 0)
 563     puts (_(" (built-in):"));
 564   else
 565     printf (_(" (from `%s', line %lu):\n"),
 566             cmds->fileinfo.filenm, cmds->fileinfo.lineno);
 567
 568   s = cmds->commands;
 569   while (*s != '\0')
 570     {
 571       char *end;
 572
 573       while (isspace ((unsigned char)*s))
 574         ++s;
 575
 576       end = strchr (s, '\n');
 577       if (end == 0)
 578         end = s + strlen (s);
 579
 580       printf ("\t%.*s\n", (int) (end - s), s);
 581
 582       s = end;
 583     }
 584 }