1 /* Basic dependency engine 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/>. */
40 extern int try_implicit_rule (struct file *file, unsigned int depth);
43 /* The test for circular dependencies is based on the 'updating' bit in
44 'struct file'. However, double colon targets have separate 'struct
45 file's; make sure we always use the base of the double colon chain. */
47 #define start_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
49 #define finish_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
51 #define is_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
55 /* Incremented when a command is started (under -n, when one would be). */
56 unsigned int commands_started = 0;
58 /* Current value for pruning the scan of the goal chain (toggle 0/1). */
59 static unsigned int considered;
61 static int update_file (struct file *file, unsigned int depth);
62 static int update_file_1 (struct file *file, unsigned int depth);
63 static int check_dep (struct file *file, unsigned int depth,
64 FILE_TIMESTAMP this_mtime, int *must_make_ptr);
65 static enum update_status touch_file (struct file *file);
66 static void remake_file (struct file *file);
67 static FILE_TIMESTAMP name_mtime (const char *name);
68 static const char *library_search (const char *lib, FILE_TIMESTAMP *mtime_ptr);
71 /* Remake all the goals in the 'struct dep' chain GOALS. Return -1 if nothing
72 was done, 0 if all goals were updated successfully, or 1 if a goal failed.
74 If rebuilding_makefiles is nonzero, these goals are makefiles, so -t, -q,
75 and -n should be disabled for them unless they were also command-line
76 targets, and we should only make one goal at a time and return as soon as
77 one goal whose 'changed' member is nonzero is successfully made. */
80 update_goal_chain (struct dep *goals)
82 int t = touch_flag, q = question_flag, n = just_print_flag;
83 enum update_status status = us_none;
85 #define MTIME(file) (rebuilding_makefiles ? file_mtime_no_search (file) \
88 /* Duplicate the chain so we can remove things from it. */
90 goals = copy_dep_chain (goals);
93 /* Clear the 'changed' flag of each goal in the chain.
94 We will use the flag below to notice when any commands
95 have actually been run for a target. When no commands
96 have been run, we give an "up to date" diagnostic. */
99 for (g = goals; g != 0; g = g->next)
103 /* All files start with the considered bit 0, so the global value is 1. */
106 /* Update all the goals until they are all finished. */
110 register struct dep *g, *lastgoal;
112 /* Start jobs that are waiting for the load to go down. */
114 start_waiting_jobs ();
116 /* Wait for a child to die. */
118 reap_children (1, 0);
124 /* Iterate over all double-colon entries for this file. */
126 int stop = 0, any_not_updated = 0;
128 for (file = g->file->double_colon ? g->file->double_colon : g->file;
132 unsigned int ocommands_started;
135 file->dontcare = g->dontcare;
137 check_renamed (file);
138 if (rebuilding_makefiles)
140 if (file->cmd_target)
147 touch_flag = question_flag = just_print_flag = 0;
150 /* Save the old value of 'commands_started' so we can compare
151 later. It will be incremented when any commands are
153 ocommands_started = commands_started;
155 fail = update_file (file, rebuilding_makefiles ? 1 : 0);
156 check_renamed (file);
158 /* Set the goal's 'changed' flag if any commands were started
159 by calling update_file above. We check this flag below to
160 decide when to give an "up to date" diagnostic. */
161 if (commands_started > ocommands_started)
164 /* If we updated a file and STATUS was not already 1, set it to
165 1 if updating failed, or to 0 if updating succeeded. Leave
166 STATUS as it is if no updating was done. */
169 if ((fail || file->updated) && status < us_question)
171 if (file->update_status != us_success)
173 /* Updating failed, or -q triggered. The STATUS value
174 tells our caller which. */
175 status = file->update_status;
176 /* If -q just triggered, stop immediately. It doesn't
177 matter how much more we run, since we already know
178 the answer to return. */
179 stop = (question_flag && !keep_going_flag
180 && !rebuilding_makefiles);
184 FILE_TIMESTAMP mtime = MTIME (file);
185 check_renamed (file);
187 if (file->updated && g->changed &&
188 mtime != file->mtime_before_update)
190 /* Updating was done. If this is a makefile and
191 just_print_flag or question_flag is set (meaning
192 -n or -q was given and this file was specified
193 as a command-line target), don't change STATUS.
194 If STATUS is changed, we will get re-exec'd, and
195 enter an infinite loop. */
196 if (!rebuilding_makefiles
197 || (!just_print_flag && !question_flag))
199 if (rebuilding_makefiles && file->dontcare)
200 /* This is a default makefile; stop remaking. */
206 /* Keep track if any double-colon entry is not finished.
207 When they are all finished, the goal is finished. */
208 any_not_updated |= !file->updated;
216 /* Reset FILE since it is null at the end of the loop. */
219 if (stop || !any_not_updated)
221 /* If we have found nothing whatever to do for the goal,
222 print a message saying nothing needs doing. */
224 if (!rebuilding_makefiles
225 /* If the update_status is success, we updated successfully
226 or not at all. G->changed will have been set above if
227 any commands were actually started for this goal. */
228 && file->update_status == us_success && !g->changed
229 /* Never give a message under -s or -q. */
230 && !silent_flag && !question_flag)
231 message (1, ((file->phony || file->cmds == 0)
232 ? _("Nothing to be done for '%s'.")
233 : _("'%s' is up to date.")),
236 /* This goal is finished. Remove it from the chain. */
240 lastgoal->next = g->next;
242 /* Free the storage. */
245 g = lastgoal == 0 ? goals : lastgoal->next;
257 /* If we reached the end of the dependency graph toggle the considered
258 flag for the next pass. */
260 considered = !considered;
263 if (rebuilding_makefiles)
273 /* If FILE is not up to date, execute the commands for it.
274 Return 0 if successful, non-0 if unsuccessful;
275 but with some flag settings, just call 'exit' if unsuccessful.
277 DEPTH is the depth in recursions of this function.
278 We increment it during the consideration of our dependencies,
279 then decrement it again after finding out whether this file
282 If there are multiple double-colon entries for FILE,
283 each is considered in turn. */
286 update_file (struct file *file, unsigned int depth)
289 register struct file *f;
291 f = file->double_colon ? file->double_colon : file;
293 /* Prune the dependency graph: if we've already been here on _this_
294 pass through the dependency graph, we don't have to go any further.
295 We won't reap_children until we start the next pass, so no state
296 change is possible below here until then. */
297 if (f->considered == considered)
299 /* Check for the case where a target has been tried and failed but
300 the diagnostics haven't been issued. If we need the diagnostics
301 then we will have to continue. */
302 if (!(f->updated && f->update_status > us_none
303 && !f->dontcare && f->no_diag))
305 DBF (DB_VERBOSE, _("Pruning file '%s'.\n"));
306 return f->command_state == cs_finished ? f->update_status : 0;
310 /* This loop runs until we start commands for a double colon rule, or until
311 the chain is exhausted. */
312 for (; f != 0; f = f->prev)
314 f->considered = considered;
316 status |= update_file_1 (f, depth);
319 /* Clean up any alloca() used during the update. */
322 /* If we got an error, don't bother with double_colon etc. */
323 if (status != 0 && !keep_going_flag)
326 if (f->command_state == cs_running
327 || f->command_state == cs_deps_running)
329 /* Don't run the other :: rules for this
330 file until this rule is finished. */
336 /* Process the remaining rules in the double colon chain so they're marked
337 considered. Start their prerequisites, too. */
338 if (file->double_colon)
339 for (; f != 0 ; f = f->prev)
343 f->considered = considered;
345 for (d = f->deps; d != 0; d = d->next)
346 status |= update_file (d->file, depth + 1);
352 /* Show a message stating the target failed to build. */
355 complain (struct file *file)
357 /* If this file has no_diag set then it means we tried to update it
358 before in the dontcare mode and failed. The target that actually
359 failed is not necessarily this file but could be one of its direct
360 or indirect dependencies. So traverse this file's dependencies and
361 find the one that actually caused the failure. */
365 for (d = file->deps; d != 0; d = d->next)
367 if (d->file->updated && d->file->update_status > us_none && file->no_diag)
376 const char *msg_noparent
377 = _("%sNo rule to make target '%s'%s");
378 const char *msg_parent
379 = _("%sNo rule to make target '%s', needed by '%s'%s");
381 /* Didn't find any dependencies to complain about. */
382 if (!keep_going_flag)
384 if (file->parent == 0)
385 fatal (NILF, msg_noparent, "", file->name, "");
387 fatal (NILF, msg_parent, "", file->name, file->parent->name, "");
390 if (file->parent == 0)
391 error (NILF, msg_noparent, "*** ", file->name, ".");
393 error (NILF, msg_parent, "*** ", file->name, file->parent->name, ".");
399 /* Consider a single 'struct file' and update it as appropriate.
400 Return 0 on success, or non-0 on failure. */
403 update_file_1 (struct file *file, unsigned int depth)
405 FILE_TIMESTAMP this_mtime;
406 int noexist, must_make, deps_changed;
413 DBF (DB_VERBOSE, _("Considering target file '%s'.\n"));
417 if (file->update_status > us_none)
420 _("Recently tried and failed to update file '%s'.\n"));
422 /* If the file we tried to make is marked no_diag then no message
423 was printed about it when it failed during the makefile rebuild.
424 If we're trying to build it again in the normal rebuild, print a
426 if (file->no_diag && !file->dontcare)
429 return file->update_status;
432 DBF (DB_VERBOSE, _("File '%s' was considered already.\n"));
436 switch (file->command_state)
439 case cs_deps_running:
442 DBF (DB_VERBOSE, _("Still updating file '%s'.\n"));
445 DBF (DB_VERBOSE, _("Finished updating file '%s'.\n"));
446 return file->update_status;
451 /* Determine whether the diagnostics will be issued should this update
453 file->no_diag = file->dontcare;
457 /* Notice recursive update of the same file. */
458 start_updating (file);
460 /* We might change file if we find a different one via vpath;
461 remember this one to turn off updating. */
464 /* Looking at the file's modtime beforehand allows the possibility
465 that its name may be changed by a VPATH search, and thus it may
466 not need an implicit rule. If this were not done, the file
467 might get implicit commands that apply to its initial name, only
468 to have that name replaced with another found by VPATH search. */
470 this_mtime = file_mtime (file);
471 check_renamed (file);
472 noexist = this_mtime == NONEXISTENT_MTIME;
474 DBF (DB_BASIC, _("File '%s' does not exist.\n"));
475 else if (ORDINARY_MTIME_MIN <= this_mtime && this_mtime <= ORDINARY_MTIME_MAX
476 && file->low_resolution_time)
478 /* Avoid spurious rebuilds due to low resolution time stamps. */
479 int ns = FILE_TIMESTAMP_NS (this_mtime);
481 error (NILF, _("*** Warning: .LOW_RESOLUTION_TIME file '%s' has a high resolution time stamp"),
483 this_mtime += FILE_TIMESTAMPS_PER_S - 1 - ns;
488 /* If file was specified as a target with no commands,
489 come up with some default commands. */
491 if (!file->phony && file->cmds == 0 && !file->tried_implicit)
493 if (try_implicit_rule (file, depth))
494 DBF (DB_IMPLICIT, _("Found an implicit rule for '%s'.\n"));
496 DBF (DB_IMPLICIT, _("No implicit rule found for '%s'.\n"));
497 file->tried_implicit = 1;
499 if (file->cmds == 0 && !file->is_target
500 && default_file != 0 && default_file->cmds != 0)
502 DBF (DB_IMPLICIT, _("Using default recipe for '%s'.\n"));
503 file->cmds = default_file->cmds;
506 /* Update all non-intermediate files we depend on, if necessary, and see
507 whether any of them is more recent than this file. We need to walk our
508 deps, AND the deps of any also_make targets to ensure everything happens
509 in the correct order. */
512 amake.next = file->also_make;
516 struct dep *lastd = 0;
518 /* Find the deps we're scanning */
524 FILE_TIMESTAMP mtime;
528 check_renamed (d->file);
530 mtime = file_mtime (d->file);
531 check_renamed (d->file);
533 if (is_updating (d->file))
535 error (NILF, _("Circular %s <- %s dependency dropped."),
536 file->name, d->file->name);
537 /* We cannot free D here because our the caller will still have
538 a reference to it when we were called recursively via
541 file->deps = d->next;
543 lastd->next = d->next;
548 d->file->parent = file;
549 maybe_make = must_make;
551 /* Inherit dontcare flag from our parent. */
552 if (rebuilding_makefiles)
554 dontcare = d->file->dontcare;
555 d->file->dontcare = file->dontcare;
558 dep_status |= check_dep (d->file, depth, this_mtime, &maybe_make);
560 /* Restore original dontcare flag. */
561 if (rebuilding_makefiles)
562 d->file->dontcare = dontcare;
564 if (! d->ignore_mtime)
565 must_make = maybe_make;
567 check_renamed (d->file);
570 register struct file *f = d->file;
575 running |= (f->command_state == cs_running
576 || f->command_state == cs_deps_running);
582 if (dep_status && !keep_going_flag)
586 /* The prereq is considered changed if the timestamp has changed while
587 it was built, OR it doesn't exist. */
588 d->changed = ((file_mtime (d->file) != mtime)
589 || (mtime == NONEXISTENT_MTIME));
596 /* Now we know whether this target needs updating.
597 If it does, update all the intermediate files we depend on. */
599 if (must_make || always_make_flag)
601 for (d = file->deps; d != 0; d = d->next)
602 if (d->file->intermediate)
606 FILE_TIMESTAMP mtime = file_mtime (d->file);
607 check_renamed (d->file);
608 d->file->parent = file;
610 /* Inherit dontcare flag from our parent. */
611 if (rebuilding_makefiles)
613 dontcare = d->file->dontcare;
614 d->file->dontcare = file->dontcare;
617 /* We may have already considered this file, when we didn't know
618 we'd need to update it. Force update_file() to consider it and
620 d->file->considered = !considered;
622 dep_status |= update_file (d->file, depth);
624 /* Restore original dontcare flag. */
625 if (rebuilding_makefiles)
626 d->file->dontcare = dontcare;
628 check_renamed (d->file);
631 register struct file *f = d->file;
636 running |= (f->command_state == cs_running
637 || f->command_state == cs_deps_running);
643 if (dep_status && !keep_going_flag)
647 d->changed = ((file->phony && file->cmds != 0)
648 || file_mtime (d->file) != mtime);
652 finish_updating (file);
653 finish_updating (ofile);
655 DBF (DB_VERBOSE, _("Finished prerequisites of target file '%s'.\n"));
659 set_command_state (file, cs_deps_running);
661 DBF (DB_VERBOSE, _("The prerequisites of '%s' are being made.\n"));
665 /* If any dependency failed, give up now. */
669 file->update_status = us_failed;
670 notice_finished_file (file);
674 DBF (DB_VERBOSE, _("Giving up on target file '%s'.\n"));
676 if (depth == 0 && keep_going_flag
677 && !just_print_flag && !question_flag)
679 _("Target '%s' not remade because of errors."), file->name);
684 if (file->command_state == cs_deps_running)
685 /* The commands for some deps were running on the last iteration, but
686 they have finished now. Reset the command_state to not_started to
687 simplify later bookkeeping. It is important that we do this only
688 when the prior state was cs_deps_running, because that prior state
689 was definitely propagated to FILE's also_make's by set_command_state
690 (called above), but in another state an also_make may have
691 independently changed to finished state, and we would confuse that
692 file's bookkeeping (updated, but not_started is bogus state). */
693 set_command_state (file, cs_not_started);
695 /* Now record which prerequisites are more
696 recent than this file, so we can define $?. */
699 for (d = file->deps; d != 0; d = d->next)
701 FILE_TIMESTAMP d_mtime = file_mtime (d->file);
702 check_renamed (d->file);
704 if (! d->ignore_mtime)
707 /* %%% In version 4, remove this code completely to
708 implement not remaking deps if their deps are newer
709 than their parents. */
710 if (d_mtime == NONEXISTENT_MTIME && !d->file->intermediate)
711 /* We must remake if this dep does not
712 exist and is not intermediate. */
716 /* Set DEPS_CHANGED if this dep actually changed. */
717 deps_changed |= d->changed;
720 /* Set D->changed if either this dep actually changed,
721 or its dependent, FILE, is older or does not exist. */
722 d->changed |= noexist || d_mtime > this_mtime;
724 if (!noexist && ISDB (DB_BASIC|DB_VERBOSE))
730 if (ISDB (DB_VERBOSE))
731 fmt = _("Prerequisite '%s' is order-only for target '%s'.\n");
733 else if (d_mtime == NONEXISTENT_MTIME)
736 fmt = _("Prerequisite '%s' of target '%s' does not exist.\n");
741 fmt = _("Prerequisite '%s' is newer than target '%s'.\n");
743 else if (ISDB (DB_VERBOSE))
744 fmt = _("Prerequisite '%s' is older than target '%s'.\n");
748 print_spaces (depth);
749 printf (fmt, dep_name (d), file->name);
755 /* Here depth returns to the value it had when we were called. */
758 if (file->double_colon && file->deps == 0)
762 _("Target '%s' is double-colon and has no prerequisites.\n"));
764 else if (!noexist && file->is_target && !deps_changed && file->cmds == 0
765 && !always_make_flag)
769 _("No recipe for '%s' and no prerequisites actually changed.\n"));
771 else if (!must_make && file->cmds != 0 && always_make_flag)
774 DBF (DB_VERBOSE, _("Making '%s' due to always-make flag.\n"));
779 if (ISDB (DB_VERBOSE))
781 print_spaces (depth);
782 printf (_("No need to remake target '%s'"), file->name);
783 if (!streq (file->name, file->hname))
784 printf (_("; using VPATH name '%s'"), file->hname);
789 notice_finished_file (file);
791 /* Since we don't need to remake the file, convert it to use the
792 VPATH filename if we found one. hfile will be either the
793 local name if no VPATH or the VPATH name if one was found. */
797 file->name = file->hname;
804 DBF (DB_BASIC, _("Must remake target '%s'.\n"));
806 /* It needs to be remade. If it's VPATH and not reset via GPATH, toss the
808 if (!streq (file->name, file->hname))
810 DB (DB_BASIC, (_(" Ignoring VPATH name '%s'.\n"), file->hname));
811 file->ignore_vpath = 1;
814 /* Now, take appropriate actions to remake the file. */
817 if (file->command_state != cs_finished)
819 DBF (DB_VERBOSE, _("Recipe of '%s' is being run.\n"));
823 switch (file->update_status)
826 DBF (DB_BASIC, _("Failed to remake target file '%s'.\n"));
829 DBF (DB_BASIC, _("Successfully remade target file '%s'.\n"));
832 DBF (DB_BASIC, _("Target file '%s' needs to be remade under -q.\n"));
839 return file->update_status;
842 /* Set FILE's 'updated' flag and re-check its mtime and the mtime's of all
843 files listed in its 'also_make' member. Under -t, this function also
846 On return, FILE->update_status will no longer be us_none if it was. */
849 notice_finished_file (struct file *file)
852 int ran = file->command_state == cs_running;
855 file->command_state = cs_finished;
859 /* The update status will be:
860 us_success if 0 or more commands (+ or ${MAKE}) were run and won;
861 us_none if this target was not remade;
862 >us_none if some commands were run and lost.
863 We touch the target if it has commands which either were not run
864 or won when they ran (i.e. status is 0). */
865 && file->update_status == us_success)
867 if (file->cmds != 0 && file->cmds->any_recurse)
869 /* If all the command lines were recursive,
870 we don't want to do the touching. */
872 for (i = 0; i < file->cmds->ncommand_lines; ++i)
873 if (!(file->cmds->lines_flags[i] & COMMANDS_RECURSE))
874 goto have_nonrecursing;
880 file->update_status = us_success;
881 /* According to POSIX, -t doesn't affect targets with no cmds. */
882 else if (file->cmds != 0)
884 /* Should set file's modification date and do nothing else. */
885 file->update_status = touch_file (file);
887 /* Pretend we ran a real touch command, to suppress the
888 "'foo' is up to date" message. */
891 /* Request for the timestamp to be updated (and distributed
892 to the double-colon entries). Simply setting ran=1 would
893 almost have done the trick, but messes up with the also_make
894 updating logic below. */
900 if (file->mtime_before_update == UNKNOWN_MTIME)
901 file->mtime_before_update = file->last_mtime;
903 if ((ran && !file->phony) || touched)
907 /* If -n, -t, or -q and all the commands are recursive, we ran them so
908 really check the target's mtime again. Otherwise, assume the target
909 would have been updated. */
911 if ((question_flag || just_print_flag || touch_flag) && file->cmds)
913 for (i = file->cmds->ncommand_lines; i > 0; --i)
914 if (! (file->cmds->lines_flags[i-1] & COMMANDS_RECURSE))
918 /* If there were no commands at all, it's always new. */
920 else if (file->is_target && file->cmds == 0)
923 file->last_mtime = i == 0 ? UNKNOWN_MTIME : NEW_MTIME;
926 if (file->double_colon)
928 /* If this is a double colon rule and it is the last one to be
929 updated, propagate the change of modification time to all the
930 double-colon entries for this file.
932 We do it on the last update because it is important to handle
933 individual entries as separate rules with separate timestamps
934 while they are treated as targets and then as one rule with the
935 unified timestamp when they are considered as a prerequisite
939 FILE_TIMESTAMP max_mtime = file->last_mtime;
941 /* Check that all rules were updated and at the same time find
942 the max timestamp. We assume UNKNOWN_MTIME is newer then
944 for (f = file->double_colon; f != 0 && f->updated; f = f->prev)
945 if (max_mtime != UNKNOWN_MTIME
946 && (f->last_mtime == UNKNOWN_MTIME || f->last_mtime > max_mtime))
947 max_mtime = f->last_mtime;
950 for (f = file->double_colon; f != 0; f = f->prev)
951 f->last_mtime = max_mtime;
954 if (ran && file->update_status != us_none)
955 /* We actually tried to update FILE, which has
956 updated its also_make's as well (if it worked).
957 If it didn't work, it wouldn't work again for them.
958 So mark them as updated with the same status. */
959 for (d = file->also_make; d != 0; d = d->next)
961 d->file->command_state = cs_finished;
962 d->file->updated = 1;
963 d->file->update_status = file->update_status;
965 if (ran && !d->file->phony)
966 /* Fetch the new modification time.
967 We do this instead of just invalidating the cached time
968 so that a vpath_search can happen. Otherwise, it would
969 never be done because the target is already updated. */
970 f_mtime (d->file, 0);
972 else if (file->update_status == us_none)
973 /* Nothing was done for FILE, but it needed nothing done.
974 So mark it now as "succeeded". */
975 file->update_status = us_success;
978 /* Check whether another file (whose mtime is THIS_MTIME) needs updating on
979 account of a dependency which is file FILE. If it does, store 1 in
980 *MUST_MAKE_PTR. In the process, update any non-intermediate files that
981 FILE depends on (including FILE itself). Return nonzero if any updating
985 check_dep (struct file *file, unsigned int depth,
986 FILE_TIMESTAMP this_mtime, int *must_make_ptr)
993 start_updating (file);
995 /* We might change file if we find a different one via vpath;
996 remember this one to turn off updating. */
999 if (file->phony || !file->intermediate)
1001 /* If this is a non-intermediate file, update it and record whether it
1002 is newer than THIS_MTIME. */
1003 FILE_TIMESTAMP mtime;
1004 dep_status = update_file (file, depth);
1005 check_renamed (file);
1006 mtime = file_mtime (file);
1007 check_renamed (file);
1008 if (mtime == NONEXISTENT_MTIME || mtime > this_mtime)
1013 /* FILE is an intermediate file. */
1014 FILE_TIMESTAMP mtime;
1016 if (!file->phony && file->cmds == 0 && !file->tried_implicit)
1018 if (try_implicit_rule (file, depth))
1019 DBF (DB_IMPLICIT, _("Found an implicit rule for '%s'.\n"));
1021 DBF (DB_IMPLICIT, _("No implicit rule found for '%s'.\n"));
1022 file->tried_implicit = 1;
1024 if (file->cmds == 0 && !file->is_target
1025 && default_file != 0 && default_file->cmds != 0)
1027 DBF (DB_IMPLICIT, _("Using default commands for '%s'.\n"));
1028 file->cmds = default_file->cmds;
1031 check_renamed (file);
1032 mtime = file_mtime (file);
1033 check_renamed (file);
1034 if (mtime != NONEXISTENT_MTIME && mtime > this_mtime)
1035 /* If the intermediate file actually exists and is newer, then we
1036 should remake from it. */
1040 /* Otherwise, update all non-intermediate files we depend on, if
1041 necessary, and see whether any of them is more recent than the
1042 file on whose behalf we are checking. */
1044 int deps_running = 0;
1046 /* If this target is not running, set it's state so that we check it
1047 fresh. It could be it was checked as part of an order-only
1048 prerequisite and so wasn't rebuilt then, but should be now. */
1049 if (file->command_state != cs_running)
1051 /* If the target was waiting for a dependency it has to be
1052 reconsidered, as that dependency might have finished. */
1053 if (file->command_state == cs_deps_running)
1054 file->considered = !considered;
1056 set_command_state (file, cs_not_started);
1065 if (is_updating (d->file))
1067 error (NILF, _("Circular %s <- %s dependency dropped."),
1068 file->name, d->file->name);
1071 file->deps = d->next;
1084 d->file->parent = file;
1085 maybe_make = *must_make_ptr;
1086 dep_status |= check_dep (d->file, depth, this_mtime,
1088 if (! d->ignore_mtime)
1089 *must_make_ptr = maybe_make;
1090 check_renamed (d->file);
1091 if (dep_status != 0 && !keep_going_flag)
1094 if (d->file->command_state == cs_running
1095 || d->file->command_state == cs_deps_running)
1103 /* Record that some of FILE's deps are still being made.
1104 This tells the upper levels to wait on processing it until the
1105 commands are finished. */
1106 set_command_state (file, cs_deps_running);
1110 finish_updating (file);
1111 finish_updating (ofile);
1116 /* Touch FILE. Return us_success if successful, us_failed if not. */
1118 #define TOUCH_ERROR(call) do{ perror_with_name ((call), file->name); \
1119 return us_failed; }while(0)
1121 static enum update_status
1122 touch_file (struct file *file)
1125 message (0, "touch %s", file->name);
1127 /* Print-only (-n) takes precedence over touch (-t). */
1128 if (just_print_flag)
1132 if (ar_name (file->name))
1133 return ar_touch (file->name) ? us_failed : us_success;
1137 int fd = open (file->name, O_RDWR | O_CREAT, 0666);
1140 TOUCH_ERROR ("touch: open: ");
1143 struct stat statbuf;
1147 EINTRLOOP (e, fstat (fd, &statbuf));
1149 TOUCH_ERROR ("touch: fstat: ");
1150 /* Rewrite character 0 same as it already is. */
1151 if (read (fd, &buf, 1) < 0)
1152 TOUCH_ERROR ("touch: read: ");
1153 if (lseek (fd, 0L, 0) < 0L)
1154 TOUCH_ERROR ("touch: lseek: ");
1155 if (write (fd, &buf, 1) < 0)
1156 TOUCH_ERROR ("touch: write: ");
1157 /* If file length was 0, we just
1158 changed it, so change it back. */
1159 if (statbuf.st_size == 0)
1162 fd = open (file->name, O_RDWR | O_TRUNC, 0666);
1164 TOUCH_ERROR ("touch: open: ");
1173 /* Having checked and updated the dependencies of FILE,
1174 do whatever is appropriate to remake FILE itself.
1175 Return the status from executing FILE's commands. */
1178 remake_file (struct file *file)
1180 if (file->cmds == 0)
1183 /* Phony target. Pretend it succeeded. */
1184 file->update_status = us_success;
1185 else if (file->is_target)
1186 /* This is a nonexistent target file we cannot make.
1187 Pretend it was successfully remade. */
1188 file->update_status = us_success;
1191 /* This is a dependency file we cannot remake. Fail. */
1192 if (!rebuilding_makefiles || !file->dontcare)
1194 file->update_status = us_failed;
1199 chop_commands (file->cmds);
1201 /* The normal case: start some commands. */
1202 if (!touch_flag || file->cmds->any_recurse)
1204 execute_file_commands (file);
1208 /* This tells notice_finished_file it is ok to touch the file. */
1209 file->update_status = us_success;
1212 /* This does the touching under -t. */
1213 notice_finished_file (file);
1216 /* Return the mtime of a file, given a 'struct file'.
1217 Caches the time in the struct file to avoid excess stat calls.
1219 If the file is not found, and SEARCH is nonzero, VPATH searching and
1220 replacement is done. If that fails, a library (-lLIBNAME) is tried and
1221 the library's actual name (/lib/libLIBNAME.a, etc.) is substituted into
1225 f_mtime (struct file *file, int search)
1227 FILE_TIMESTAMP mtime;
1229 /* File's mtime is not known; must get it from the system. */
1232 if (ar_name (file->name))
1234 /* This file is an archive-member reference. */
1236 char *arname, *memname;
1237 struct file *arfile;
1240 /* Find the archive's name. */
1241 ar_parse_name (file->name, &arname, &memname);
1243 /* Find the modification time of the archive itself.
1244 Also allow for its name to be changed via VPATH search. */
1245 arfile = lookup_file (arname);
1247 arfile = enter_file (strcache_add (arname));
1248 mtime = f_mtime (arfile, search);
1249 check_renamed (arfile);
1250 if (search && strcmp (arfile->hname, arname))
1252 /* The archive's name has changed.
1253 Change the archive-member reference accordingly. */
1256 unsigned int arlen, memlen;
1258 arlen = strlen (arfile->hname);
1259 memlen = strlen (memname);
1261 name = alloca (arlen + 1 + memlen + 2);
1262 memcpy (name, arfile->hname, arlen);
1264 memcpy (name + arlen + 1, memname, memlen);
1265 name[arlen + 1 + memlen] = ')';
1266 name[arlen + 1 + memlen + 1] = '\0';
1268 /* If the archive was found with GPATH, make the change permanent;
1269 otherwise defer it until later. */
1270 if (arfile->name == arfile->hname)
1271 rename_file (file, strcache_add (name));
1273 rehash_file (file, strcache_add (name));
1274 check_renamed (file);
1279 file->low_resolution_time = 1;
1281 if (mtime == NONEXISTENT_MTIME)
1282 /* The archive doesn't exist, so its members don't exist either. */
1283 return NONEXISTENT_MTIME;
1285 member_date = ar_member_date (file->hname);
1286 mtime = (member_date == (time_t) -1
1288 : file_timestamp_cons (file->hname, member_date, 0));
1293 mtime = name_mtime (file->name);
1295 if (mtime == NONEXISTENT_MTIME && search && !file->ignore_vpath)
1297 /* If name_mtime failed, search VPATH. */
1298 const char *name = vpath_search (file->name, &mtime, NULL, NULL);
1300 /* Last resort, is it a library (-lxxx)? */
1301 || (file->name[0] == '-' && file->name[1] == 'l'
1302 && (name = library_search (file->name, &mtime)) != 0))
1304 if (mtime != UNKNOWN_MTIME)
1305 /* vpath_search and library_search store UNKNOWN_MTIME
1306 if they didn't need to do a stat call for their work. */
1307 file->last_mtime = mtime;
1309 /* If we found it in VPATH, see if it's in GPATH too; if so,
1310 change the name right now; if not, defer until after the
1311 dependencies are updated. */
1312 if (gpath_search (name, strlen (name) - strlen (file->name) - 1))
1314 rename_file (file, name);
1315 check_renamed (file);
1316 return file_mtime (file);
1319 rehash_file (file, name);
1320 check_renamed (file);
1321 /* If the result of a vpath search is -o or -W, preserve it.
1322 Otherwise, find the mtime of the resulting file. */
1323 if (mtime != OLD_MTIME && mtime != NEW_MTIME)
1324 mtime = name_mtime (name);
1329 /* Files can have bogus timestamps that nothing newly made will be
1330 "newer" than. Updating their dependents could just result in loops.
1331 So notify the user of the anomaly with a warning.
1333 We only need to do this once, for now. */
1335 if (!clock_skew_detected
1336 && mtime != NONEXISTENT_MTIME && mtime != NEW_MTIME
1339 static FILE_TIMESTAMP adjusted_now;
1341 FILE_TIMESTAMP adjusted_mtime = mtime;
1343 #if defined(WINDOWS32) || defined(__MSDOS__)
1344 /* Experimentation has shown that FAT filesystems can set file times
1345 up to 3 seconds into the future! Play it safe. */
1347 #define FAT_ADJ_OFFSET (FILE_TIMESTAMP) 3
1349 FILE_TIMESTAMP adjustment = FAT_ADJ_OFFSET << FILE_TIMESTAMP_LO_BITS;
1350 if (ORDINARY_MTIME_MIN + adjustment <= adjusted_mtime)
1351 adjusted_mtime -= adjustment;
1352 #elif defined(__EMX__)
1353 /* FAT filesystems round time to the nearest even second!
1354 Allow for any file (NTFS or FAT) to perhaps suffer from this
1356 FILE_TIMESTAMP adjustment = (((FILE_TIMESTAMP_S (adjusted_mtime) & 1) == 0
1357 && FILE_TIMESTAMP_NS (adjusted_mtime) == 0)
1358 ? (FILE_TIMESTAMP) 1 << FILE_TIMESTAMP_LO_BITS
1362 /* If the file's time appears to be in the future, update our
1363 concept of the present and try once more. */
1364 if (adjusted_now < adjusted_mtime)
1367 FILE_TIMESTAMP now = file_timestamp_now (&resolution);
1368 adjusted_now = now + (resolution - 1);
1369 if (adjusted_now < adjusted_mtime)
1372 error (NILF, _("Warning: File '%s' has modification time in the future"),
1376 (FILE_TIMESTAMP_S (mtime) - FILE_TIMESTAMP_S (now)
1377 + ((FILE_TIMESTAMP_NS (mtime) - FILE_TIMESTAMP_NS (now))
1379 char from_now_string[100];
1381 if (from_now >= 99 && from_now <= ULONG_MAX)
1382 sprintf (from_now_string, "%lu", (unsigned long) from_now);
1384 sprintf (from_now_string, "%.2g", from_now);
1385 error (NILF, _("Warning: File '%s' has modification time %s s in the future"),
1386 file->name, from_now_string);
1388 clock_skew_detected = 1;
1393 /* Store the mtime into all the entries for this file. */
1394 if (file->double_colon)
1395 file = file->double_colon;
1399 /* If this file is not implicit but it is intermediate then it was
1400 made so by the .INTERMEDIATE target. If this file has never
1401 been built by us but was found now, it existed before make
1402 started. So, turn off the intermediate bit so make doesn't
1403 delete it, since it didn't create it. */
1404 if (mtime != NONEXISTENT_MTIME && file->command_state == cs_not_started
1405 && !file->tried_implicit && file->intermediate)
1406 file->intermediate = 0;
1408 file->last_mtime = mtime;
1417 /* Return the mtime of the file or archive-member reference NAME. */
1419 /* First, we check with stat(). If the file does not exist, then we return
1420 NONEXISTENT_MTIME. If it does, and the symlink check flag is set, then
1421 examine each indirection of the symlink and find the newest mtime.
1422 This causes one duplicate stat() when -L is being used, but the code is
1425 static FILE_TIMESTAMP
1426 name_mtime (const char *name)
1428 FILE_TIMESTAMP mtime;
1432 EINTRLOOP (e, stat (name, &st));
1434 mtime = FILE_TIMESTAMP_STAT_MODTIME (name, st);
1435 else if (errno == ENOENT || errno == ENOTDIR)
1436 mtime = NONEXISTENT_MTIME;
1439 perror_with_name ("stat: ", name);
1440 return NONEXISTENT_MTIME;
1443 /* If we get here we either found it, or it doesn't exist.
1444 If it doesn't exist see if we can use a symlink mtime instead. */
1446 #ifdef MAKE_SYMLINKS
1448 # define S_ISLNK(_m) (((_m)&S_IFMT)==S_IFLNK)
1450 if (check_symlink_flag)
1454 /* Check each symbolic link segment (if any). Find the latest mtime
1455 amongst all of them (and the target file of course).
1456 Note that we have already successfully dereferenced all the links
1457 above. So, if we run into any error trying to lstat(), or
1458 readlink(), or whatever, something bizarre-o happened. Just give up
1459 and use whatever mtime we've already computed at that point. */
1460 strcpy (lpath, name);
1463 FILE_TIMESTAMP ltime;
1468 EINTRLOOP (e, lstat (lpath, &st));
1471 /* Just take what we have so far. */
1472 if (errno != ENOENT && errno != ENOTDIR)
1473 perror_with_name ("lstat: ", lpath);
1477 /* If this is not a symlink, we're done (we started with the real
1478 file's mtime so we don't need to test it again). */
1479 if (!S_ISLNK (st.st_mode))
1482 /* If this mtime is newer than what we had, keep the new one. */
1483 ltime = FILE_TIMESTAMP_STAT_MODTIME (lpath, st);
1487 /* Set up to check the file pointed to by this link. */
1488 EINTRLOOP (llen, readlink (lpath, lbuf, GET_PATH_MAX));
1491 /* Eh? Just take what we have. */
1492 perror_with_name ("readlink: ", lpath);
1497 /* If the target is fully-qualified or the source is just a
1498 filename, then the new path is the target. Otherwise it's the
1499 source directory plus the target. */
1500 if (lbuf[0] == '/' || (p = strrchr (lpath, '/')) == NULL)
1501 strcpy (lpath, lbuf);
1502 else if ((p - lpath) + llen + 2 > GET_PATH_MAX)
1503 /* Eh? Path too long! Again, just go with what we have. */
1506 /* Create the next step in the symlink chain. */
1516 /* Search for a library file specified as -lLIBNAME, searching for a
1517 suitable library file in the system library directories and the VPATH
1521 library_search (const char *lib, FILE_TIMESTAMP *mtime_ptr)
1523 static char *dirs[] =
1529 #if defined(WINDOWS32) && !defined(LIBDIR)
1531 * This is completely up to the user at product install time. Just define
1536 LIBDIR, /* Defined by configuration. */
1540 const char *file = 0;
1542 FILE_TIMESTAMP mtime;
1544 /* Loop variables for the libpatterns value. */
1548 unsigned int liblen;
1550 /* Information about the earliest (in the vpath sequence) match. */
1551 unsigned int best_vpath = 0, best_path = 0;
1555 libpatterns = xstrdup (variable_expand ("$(.LIBPATTERNS)"));
1557 /* Skip the '-l'. */
1559 liblen = strlen (lib);
1561 /* Loop through all the patterns in .LIBPATTERNS, and search on each one.
1562 To implement the linker-compatible behavior we have to search through
1563 all entries in .LIBPATTERNS and choose the "earliest" one. */
1565 while ((p = find_next_token (&p2, &len)) != 0)
1567 static char *buf = NULL;
1568 static unsigned int buflen = 0;
1569 static int libdir_maxlen = -1;
1570 static unsigned int std_dirs = 0;
1571 char *libbuf = variable_expand ("");
1573 /* Expand the pattern using LIB as a replacement. */
1579 p3 = find_percent (p);
1582 /* Give a warning if there is no pattern. */
1583 error (NILF, _(".LIBPATTERNS element '%s' is not a pattern"), p);
1587 p4 = variable_buffer_output (libbuf, p, p3-p);
1588 p4 = variable_buffer_output (p4, lib, liblen);
1589 p4 = variable_buffer_output (p4, p3+1, len - (p3-p));
1593 /* Look first for 'libNAME.a' in the current directory. */
1594 mtime = name_mtime (libbuf);
1595 if (mtime != NONEXISTENT_MTIME)
1599 file = strcache_add (libbuf);
1600 /* This by definition will have the best index, so stop now. */
1604 /* Now try VPATH search on that. */
1607 unsigned int vpath_index, path_index;
1608 const char* f = vpath_search (libbuf, mtime_ptr ? &mtime : NULL,
1609 &vpath_index, &path_index);
1612 /* If we have a better match, record it. */
1614 vpath_index < best_vpath ||
1615 (vpath_index == best_vpath && path_index < best_path))
1618 best_vpath = vpath_index;
1619 best_path = path_index;
1627 /* Now try the standard set of directories. */
1631 for (dp = dirs; *dp != 0; ++dp)
1633 int l = strlen (*dp);
1634 if (l > libdir_maxlen)
1638 buflen = strlen (libbuf);
1639 buf = xmalloc (libdir_maxlen + buflen + 2);
1641 else if (buflen < strlen (libbuf))
1643 buflen = strlen (libbuf);
1644 buf = xrealloc (buf, libdir_maxlen + buflen + 2);
1648 /* Use the last std_dirs index for standard directories. This
1649 was it will always be greater than the VPATH index. */
1650 unsigned int vpath_index = ~((unsigned int)0) - std_dirs;
1652 for (dp = dirs; *dp != 0; ++dp)
1654 sprintf (buf, "%s/%s", *dp, libbuf);
1655 mtime = name_mtime (buf);
1656 if (mtime != NONEXISTENT_MTIME)
1658 if (file == 0 || vpath_index < best_vpath)
1660 file = strcache_add (buf);
1661 best_vpath = vpath_index;