1 /* Command processing for GNU Make.
2 Copyright (C) 1988-2013 Free Software Foundation, Inc.
3 This file is part of GNU Make.
5 GNU Make is free software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the Free Software
7 Foundation; either version 3 of the License, or (at your option) any later
10 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License along with
15 this program. If not, see <http://www.gnu.org/licenses/>. */
31 # define FILE_LIST_SEPARATOR ','
33 # define FILE_LIST_SEPARATOR ' '
36 int remote_kill (int id, int sig);
44 dep_hash_1 (const void *key)
46 const struct dep *d = key;
47 return_STRING_HASH_1 (dep_name (d));
51 dep_hash_2 (const void *key)
53 const struct dep *d = key;
54 return_STRING_HASH_2 (dep_name (d));
58 dep_hash_cmp (const void *x, const void *y)
60 const struct dep *dx = x;
61 const struct dep *dy = y;
62 return strcmp (dep_name (dx), dep_name (dy));
65 /* Set FILE's automatic variables up. */
68 set_file_variables (struct file *file)
71 const char *at, *percent, *star, *less;
74 /* If the target is an archive member 'lib(member)',
75 then $@ is 'lib' and $% is 'member'. */
77 if (ar_name (file->name))
83 cp = strchr (file->name, '(');
84 p = alloca (cp - file->name + 1);
85 memcpy (p, file->name, cp - file->name);
86 p[cp - file->name] = '\0';
88 len = strlen (cp + 1);
90 memcpy (p, cp + 1, len - 1);
95 #endif /* NO_ARCHIVES. */
101 /* $* is the stem from an implicit or static pattern rule. */
104 /* In Unix make, $* is set to the target name with
105 any suffix in the .SUFFIXES list stripped off for
106 explicit rules. We store this in the 'stem' member. */
111 if (ar_name (file->name))
113 name = strchr (file->name, '(') + 1;
114 len = strlen (name) - 1;
123 for (d = enter_file (strcache_add (".SUFFIXES"))->deps; d ; d = d->next)
125 unsigned int slen = strlen (dep_name (d));
126 if (len > slen && strneq (dep_name (d), name + (len - slen), slen))
128 file->stem = strcache_add_len (name, len - slen);
137 /* $< is the first not order-only dependency. */
139 for (d = file->deps; d != 0; d = d->next)
140 if (!d->ignore_mtime)
142 if (!d->need_2nd_expansion)
147 if (file->cmds == default_file->cmds)
148 /* This file got its commands from .DEFAULT.
149 In this case $< is the same as $@. */
152 #define DEFINE_VARIABLE(name, len, value) \
153 (void) define_variable_for_file (name,len,value,o_automatic,0,file)
155 /* Define the variables. */
157 DEFINE_VARIABLE ("<", 1, less);
158 DEFINE_VARIABLE ("*", 1, star);
159 DEFINE_VARIABLE ("@", 1, at);
160 DEFINE_VARIABLE ("%", 1, percent);
162 /* Compute the values for $^, $+, $?, and $|. */
165 static char *plus_value=0, *bar_value=0, *qmark_value=0;
166 static unsigned int plus_max=0, bar_max=0, qmark_max=0;
168 unsigned int qmark_len, plus_len, bar_len;
175 struct hash_table dep_hash;
178 /* Compute first the value for $+, which is supposed to contain
179 duplicate dependencies as they were listed in the makefile. */
183 for (d = file->deps; d != 0; d = d->next)
185 if (!d->need_2nd_expansion)
188 bar_len += strlen (dep_name (d)) + 1;
190 plus_len += strlen (dep_name (d)) + 1;
200 if (plus_len > plus_max)
201 plus_value = xrealloc (plus_value, plus_max = plus_len);
205 qmark_len = plus_len + 1; /* Will be this or less. */
206 for (d = file->deps; d != 0; d = d->next)
207 if (! d->ignore_mtime && ! d->need_2nd_expansion)
209 const char *c = dep_name (d);
214 c = strchr (c, '(') + 1;
215 len = strlen (c) - 1;
223 *cp++ = FILE_LIST_SEPARATOR;
224 if (! (d->changed || always_make_flag))
225 qmark_len -= len + 1; /* Don't space in $? for this one. */
228 /* Kill the last space and define the variable. */
230 cp[cp > plus_value ? -1 : 0] = '\0';
231 DEFINE_VARIABLE ("+", 1, plus_value);
233 /* Compute the values for $^, $?, and $|. */
235 cp = caret_value = plus_value; /* Reuse the buffer; it's big enough. */
237 if (qmark_len > qmark_max)
238 qmark_value = xrealloc (qmark_value, qmark_max = qmark_len);
241 if (bar_len > bar_max)
242 bar_value = xrealloc (bar_value, bar_max = bar_len);
245 /* Make sure that no dependencies are repeated in $^, $?, and $|. It
246 would be natural to combine the next two loops but we can't do it
247 because of a situation where we have two dep entries, the first
248 is order-only and the second is normal (see below). */
250 hash_init (&dep_hash, 500, dep_hash_1, dep_hash_2, dep_hash_cmp);
252 for (d = file->deps; d != 0; d = d->next)
254 if (d->need_2nd_expansion)
257 slot = hash_find_slot (&dep_hash, d);
258 if (HASH_VACANT (*slot))
259 hash_insert_at (&dep_hash, d, slot);
262 /* Check if the two prerequisites have different ignore_mtime.
263 If so then we need to "upgrade" one that is order-only. */
265 struct dep* hd = (struct dep*) *slot;
267 if (d->ignore_mtime != hd->ignore_mtime)
268 d->ignore_mtime = hd->ignore_mtime = 0;
272 for (d = file->deps; d != 0; d = d->next)
276 if (d->need_2nd_expansion || hash_find_item (&dep_hash, d) != d)
283 c = strchr (c, '(') + 1;
284 len = strlen (c) - 1;
294 *bp++ = FILE_LIST_SEPARATOR;
300 *cp++ = FILE_LIST_SEPARATOR;
301 if (d->changed || always_make_flag)
305 *qp++ = FILE_LIST_SEPARATOR;
310 hash_free (&dep_hash, 0);
312 /* Kill the last spaces and define the variables. */
314 cp[cp > caret_value ? -1 : 0] = '\0';
315 DEFINE_VARIABLE ("^", 1, caret_value);
317 qp[qp > qmark_value ? -1 : 0] = '\0';
318 DEFINE_VARIABLE ("?", 1, qmark_value);
320 bp[bp > bar_value ? -1 : 0] = '\0';
321 DEFINE_VARIABLE ("|", 1, bar_value);
324 #undef DEFINE_VARIABLE
327 /* Chop CMDS up into individual command lines if necessary.
328 Also set the 'lines_flags' and 'any_recurse' members. */
331 chop_commands (struct commands *cmds)
333 unsigned int nlines, idx;
336 /* If we don't have any commands,
337 or we already parsed them, never mind. */
339 if (!cmds || cmds->command_lines != 0)
342 /* Chop CMDS->commands up into lines in CMDS->command_lines. */
346 int l = strlen (cmds->commands);
349 lines = xmalloc (nlines * sizeof (char *));
350 lines[0] = xstrdup (cmds->commands);
352 /* Strip the trailing newline. */
353 if (l > 0 && lines[0][l-1] == '\n')
354 lines[0][l-1] = '\0';
361 lines = xmalloc (nlines * sizeof (char *));
368 end = strchr (end, '\n');
370 end = p + strlen (p);
371 else if (end > p && end[-1] == '\\')
375 for (b = end - 2; b >= p && *b == '\\'; --b)
376 backslash = !backslash;
387 lines = xrealloc (lines, nlines * sizeof (char *));
389 lines[idx++] = xstrndup (p, end - p);
398 lines = xrealloc (lines, nlines * sizeof (char *));
402 /* Finally, set the corresponding CMDS->lines_flags elements and the
403 CMDS->any_recurse flag. */
405 if (nlines > USHRT_MAX)
406 fatal (&cmds->fileinfo, _("Recipe has too many lines (%ud)"), nlines);
408 cmds->ncommand_lines = nlines;
409 cmds->command_lines = lines;
411 cmds->any_recurse = 0;
412 cmds->lines_flags = xmalloc (nlines);
414 for (idx = 0; idx < nlines; ++idx)
417 const char *p = lines[idx];
419 while (isblank (*p) || *p == '-' || *p == '@' || *p == '+')
423 flags |= COMMANDS_RECURSE;
426 flags |= COMMANDS_SILENT;
429 flags |= COMMANDS_NOERROR;
433 /* If no explicit '+' was given, look for MAKE variable references. */
434 if (!(flags & COMMANDS_RECURSE)
435 && (strstr (p, "$(MAKE)") != 0 || strstr (p, "${MAKE}") != 0))
436 flags |= COMMANDS_RECURSE;
438 cmds->lines_flags[idx] = flags;
439 cmds->any_recurse |= flags & COMMANDS_RECURSE ? 1 : 0;
443 /* Execute the commands to remake FILE. If they are currently executing,
444 return or have already finished executing, just return. Otherwise,
445 fork off a child process to run the first command line in the sequence. */
448 execute_file_commands (struct file *file)
452 /* Don't go through all the preparations if
453 the commands are nothing but whitespace. */
455 for (p = file->cmds->commands; *p != '\0'; ++p)
456 if (!isspace ((unsigned char)*p) && *p != '-' && *p != '@')
460 /* If there are no commands, assume everything worked. */
461 set_command_state (file, cs_running);
462 file->update_status = us_success;
463 notice_finished_file (file);
467 /* First set the automatic variables according to this file. */
469 initialize_file_variables (file, 0);
471 set_file_variables (file);
473 /* If this is a loaded dynamic object, unload it before remaking.
474 Some systems don't support overwriting a loaded object. */
476 unload_file (file->name);
478 /* Start the commands running. */
482 /* This is set while we are inside fatal_error_signal,
483 so things can avoid nonreentrant operations. */
485 int handling_fatal_signal = 0;
487 /* Handle fatal signals. */
490 fatal_error_signal (int sig)
493 extern int dos_status, dos_command_running;
495 if (dos_command_running)
497 /* That was the child who got the signal, not us. */
498 dos_status |= (sig << 8);
501 remove_intermediates (1);
503 #else /* not __MSDOS__ */
505 remove_intermediates (1);
507 fputs (_("*** Break.\n"), stderr);
510 #else /* not Amiga */
512 extern HANDLE main_thread;
514 /* Windows creates a sperate thread for handling Ctrl+C, so we need
515 to suspend the main thread, or else we will have race conditions
516 when both threads call reap_children. */
519 DWORD susp_count = SuspendThread (main_thread);
522 fprintf (stderr, "SuspendThread: suspend count = %ld\n", susp_count);
523 else if (susp_count == (DWORD)-1)
525 DWORD ierr = GetLastError ();
527 fprintf (stderr, "SuspendThread: error %ld: %s\n",
528 ierr, map_windows32_error_to_string (ierr));
532 handling_fatal_signal = 1;
534 /* Set the handling for this signal to the default.
535 It is blocked now while we run this handler. */
536 signal (sig, SIG_DFL);
538 /* A termination signal won't be sent to the entire
539 process group, but it means we want to kill the children. */
544 for (c = children; c != 0; c = c->next)
546 (void) kill (c->pid, SIGTERM);
549 /* If we got a signal that means the user
550 wanted to kill make, remove pending targets. */
552 if (sig == SIGTERM || sig == SIGINT
563 /* Remote children won't automatically get signals sent
564 to the process group, so we must send them. */
565 for (c = children; c != 0; c = c->next)
567 (void) remote_kill (c->pid, sig);
569 for (c = children; c != 0; c = c->next)
570 delete_child_targets (c);
572 /* Clean up the children. We don't just use the call below because
573 we don't want to print the "Waiting for children" message. */
574 while (job_slots_used > 0)
575 reap_children (1, 0);
578 /* Wait for our children to die. */
579 while (job_slots_used > 0)
580 reap_children (1, 1);
582 /* Delete any non-precious intermediate files that were made. */
584 remove_intermediates (1);
588 /* We don't want to send ourselves SIGQUIT, because it will
589 cause a core dump. Just exit instead. */
595 CloseHandle (main_thread);
596 /* Cannot call W32_kill with a pid (it needs a handle). The exit
597 status of 130 emulates what happens in Bash. */
600 /* Signal the same code; this time it will really be fatal. The signal
601 will be unblocked when we return and arrive then to kill us. */
602 if (kill (getpid (), sig) < 0)
603 pfatal_with_name ("kill");
604 #endif /* not WINDOWS32 */
605 #endif /* not Amiga */
606 #endif /* not __MSDOS__ */
609 /* Delete FILE unless it's precious or not actually a file (phony),
610 and it has changed on disk since we last stat'd it. */
613 delete_target (struct file *file, const char *on_behalf_of)
618 if (file->precious || file->phony)
622 if (ar_name (file->name))
624 time_t file_date = (file->last_mtime == NONEXISTENT_MTIME
626 : (time_t) FILE_TIMESTAMP_S (file->last_mtime));
627 if (ar_member_date (file->name) != file_date)
630 error (NILF, _("*** [%s] Archive member '%s' may be bogus; not deleted"),
631 on_behalf_of, file->name);
633 error (NILF, _("*** Archive member '%s' may be bogus; not deleted"),
640 EINTRLOOP (e, stat (file->name, &st));
642 && S_ISREG (st.st_mode)
643 && FILE_TIMESTAMP_STAT_MODTIME (file->name, st) != file->last_mtime)
646 error (NILF, _("*** [%s] Deleting file '%s'"), on_behalf_of, file->name);
648 error (NILF, _("*** Deleting file '%s'"), file->name);
649 if (unlink (file->name) < 0
650 && errno != ENOENT) /* It disappeared; so what. */
651 perror_with_name ("unlink: ", file->name);
656 /* Delete all non-precious targets of CHILD unless they were already deleted.
657 Set the flag in CHILD to say they've been deleted. */
660 delete_child_targets (struct child *child)
667 /* Delete the target file if it changed. */
668 delete_target (child->file, NULL);
670 /* Also remove any non-precious targets listed in the 'also_make' member. */
671 for (d = child->file->also_make; d != 0; d = d->next)
672 delete_target (d->file, child->file->name);
677 /* Print out the commands in CMDS. */
680 print_commands (const struct commands *cmds)
684 fputs (_("# recipe to execute"), stdout);
686 if (cmds->fileinfo.filenm == 0)
687 puts (_(" (built-in):"));
689 printf (_(" (from '%s', line %lu):\n"),
690 cmds->fileinfo.filenm, cmds->fileinfo.lineno);
698 /* Print one full logical recipe line: find a non-escaped newline. */
699 for (end = s, bs = 0; *end != '\0'; ++end)
701 if (*end == '\n' && !bs)
704 bs = *end == '\\' ? !bs : 0;
707 printf ("%c%.*s\n", cmd_prefix, (int) (end - s), s);
709 s = end + (end[0] == '\n');