1 /* Basic dependency engine for GNU Make.
2 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
5 This file is part of GNU Make.
7 GNU Make is free software; you can redistribute it and/or modify it under the
8 terms of the GNU General Public License as published by the Free Software
9 Foundation; either version 3 of the License, or (at your option) any later
12 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along with
17 this program. If not, see <http://www.gnu.org/licenses/>. */
42 extern int try_implicit_rule (struct file
*file
, unsigned int depth
);
45 /* The test for circular dependencies is based on the 'updating' bit in
46 `struct file'. However, double colon targets have seperate `struct
47 file's; make sure we always use the base of the double colon chain. */
49 #define start_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
51 #define finish_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
53 #define is_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
57 /* Incremented when a command is started (under -n, when one would be). */
58 unsigned int commands_started
= 0;
60 /* Current value for pruning the scan of the goal chain (toggle 0/1). */
61 static unsigned int considered
;
63 static int update_file (struct file
*file
, unsigned int depth
);
64 static int update_file_1 (struct file
*file
, unsigned int depth
);
65 static int check_dep (struct file
*file
, unsigned int depth
,
66 FILE_TIMESTAMP this_mtime
, int *must_make_ptr
);
67 static int touch_file (struct file
*file
);
68 static void remake_file (struct file
*file
);
69 static FILE_TIMESTAMP
name_mtime (const char *name
);
70 static const char *library_search (const char *lib
, FILE_TIMESTAMP
*mtime_ptr
);
73 /* Remake all the goals in the `struct dep' chain GOALS. Return -1 if nothing
74 was done, 0 if all goals were updated successfully, or 1 if a goal failed.
76 If rebuilding_makefiles is nonzero, these goals are makefiles, so -t, -q,
77 and -n should be disabled for them unless they were also command-line
78 targets, and we should only make one goal at a time and return as soon as
79 one goal whose `changed' member is nonzero is successfully made. */
82 update_goal_chain (struct dep
*goals
)
84 int t
= touch_flag
, q
= question_flag
, n
= just_print_flag
;
85 unsigned int j
= job_slots
;
88 #define MTIME(file) (rebuilding_makefiles ? file_mtime_no_search (file) \
91 /* Duplicate the chain so we can remove things from it. */
93 goals
= copy_dep_chain (goals
);
96 /* Clear the `changed' flag of each goal in the chain.
97 We will use the flag below to notice when any commands
98 have actually been run for a target. When no commands
99 have been run, we give an "up to date" diagnostic. */
102 for (g
= goals
; g
!= 0; g
= g
->next
)
106 /* All files start with the considered bit 0, so the global value is 1. */
109 /* Update all the goals until they are all finished. */
113 register struct dep
*g
, *lastgoal
;
115 /* Start jobs that are waiting for the load to go down. */
117 start_waiting_jobs ();
119 /* Wait for a child to die. */
121 reap_children (1, 0);
127 /* Iterate over all double-colon entries for this file. */
129 int stop
= 0, any_not_updated
= 0;
131 for (file
= g
->file
->double_colon
? g
->file
->double_colon
: g
->file
;
135 unsigned int ocommands_started
;
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 x
= 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 ((x
!= 0 || file
->updated
) && status
< 1)
171 if (file
->update_status
!= 0)
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
;
214 /* Reset FILE since it is null at the end of the loop. */
217 if (stop
|| !any_not_updated
)
219 /* If we have found nothing whatever to do for the goal,
220 print a message saying nothing needs doing. */
222 if (!rebuilding_makefiles
223 /* If the update_status is zero, we updated successfully
224 or not at all. G->changed will have been set above if
225 any commands were actually started for this goal. */
226 && file
->update_status
== 0 && !g
->changed
227 /* Never give a message under -s or -q. */
228 && !silent_flag
&& !question_flag
)
229 message (1, ((file
->phony
|| file
->cmds
== 0)
230 ? _("Nothing to be done for `%s'.")
231 : _("`%s' is up to date.")),
234 /* This goal is finished. Remove it from the chain. */
238 lastgoal
->next
= g
->next
;
240 /* Free the storage. */
243 g
= lastgoal
== 0 ? goals
: lastgoal
->next
;
255 /* If we reached the end of the dependency graph toggle the considered
256 flag for the next pass. */
258 considered
= !considered
;
261 if (rebuilding_makefiles
)
272 /* If FILE is not up to date, execute the commands for it.
273 Return 0 if successful, 1 if unsuccessful;
274 but with some flag settings, just call `exit' if unsuccessful.
276 DEPTH is the depth in recursions of this function.
277 We increment it during the consideration of our dependencies,
278 then decrement it again after finding out whether this file
281 If there are multiple double-colon entries for FILE,
282 each is considered in turn. */
285 update_file (struct file
*file
, unsigned int depth
)
287 register int status
= 0;
288 register struct file
*f
;
290 f
= file
->double_colon
? file
->double_colon
: file
;
292 /* Prune the dependency graph: if we've already been here on _this_
293 pass through the dependency graph, we don't have to go any further.
294 We won't reap_children until we start the next pass, so no state
295 change is possible below here until then. */
296 if (f
->considered
== considered
)
298 DBF (DB_VERBOSE
, _("Pruning file `%s'.\n"));
299 return f
->command_state
== cs_finished
? f
->update_status
: 0;
302 /* This loop runs until we start commands for a double colon rule, or until
303 the chain is exhausted. */
304 for (; f
!= 0; f
= f
->prev
)
306 f
->considered
= considered
;
308 status
|= update_file_1 (f
, depth
);
311 /* Clean up any alloca() used during the update. */
314 /* If we got an error, don't bother with double_colon etc. */
315 if (status
!= 0 && !keep_going_flag
)
318 if (f
->command_state
== cs_running
319 || f
->command_state
== cs_deps_running
)
321 /* Don't run the other :: rules for this
322 file until this rule is finished. */
328 /* Process the remaining rules in the double colon chain so they're marked
329 considered. Start their prerequisites, too. */
330 if (file
->double_colon
)
331 for (; f
!= 0 ; f
= f
->prev
)
335 f
->considered
= considered
;
337 for (d
= f
->deps
; d
!= 0; d
= d
->next
)
338 status
|= update_file (d
->file
, depth
+ 1);
344 /* Show a message stating the target failed to build. */
347 complain (const struct file
*file
)
349 const char *msg_noparent
350 = _("%sNo rule to make target `%s'%s");
351 const char *msg_parent
352 = _("%sNo rule to make target `%s', needed by `%s'%s");
354 if (!keep_going_flag
)
356 if (file
->parent
== 0)
357 fatal (NILF
, msg_noparent
, "", file
->name
, "");
359 fatal (NILF
, msg_parent
, "", file
->name
, file
->parent
->name
, "");
362 if (file
->parent
== 0)
363 error (NILF
, msg_noparent
, "*** ", file
->name
, ".");
365 error (NILF
, msg_parent
, "*** ", file
->name
, file
->parent
->name
, ".");
368 /* Consider a single `struct file' and update it as appropriate. */
371 update_file_1 (struct file
*file
, unsigned int depth
)
373 register FILE_TIMESTAMP this_mtime
;
374 int noexist
, must_make
, deps_changed
;
376 register struct dep
*d
, *lastd
;
379 DBF (DB_VERBOSE
, _("Considering target file `%s'.\n"));
383 if (file
->update_status
> 0)
386 _("Recently tried and failed to update file `%s'.\n"));
388 /* If the file we tried to make is marked dontcare then no message
389 was printed about it when it failed during the makefile rebuild.
390 If we're trying to build it again in the normal rebuild, print a
392 if (file
->dontcare
&& !rebuilding_makefiles
)
398 return file
->update_status
;
401 DBF (DB_VERBOSE
, _("File `%s' was considered already.\n"));
405 switch (file
->command_state
)
408 case cs_deps_running
:
411 DBF (DB_VERBOSE
, _("Still updating file `%s'.\n"));
414 DBF (DB_VERBOSE
, _("Finished updating file `%s'.\n"));
415 return file
->update_status
;
422 /* Notice recursive update of the same file. */
423 start_updating (file
);
425 /* Looking at the file's modtime beforehand allows the possibility
426 that its name may be changed by a VPATH search, and thus it may
427 not need an implicit rule. If this were not done, the file
428 might get implicit commands that apply to its initial name, only
429 to have that name replaced with another found by VPATH search. */
431 this_mtime
= file_mtime (file
);
432 check_renamed (file
);
433 noexist
= this_mtime
== NONEXISTENT_MTIME
;
435 DBF (DB_BASIC
, _("File `%s' does not exist.\n"));
436 else if (ORDINARY_MTIME_MIN
<= this_mtime
&& this_mtime
<= ORDINARY_MTIME_MAX
437 && file
->low_resolution_time
)
439 /* Avoid spurious rebuilds due to low resolution time stamps. */
440 int ns
= FILE_TIMESTAMP_NS (this_mtime
);
442 error (NILF
, _("*** Warning: .LOW_RESOLUTION_TIME file `%s' has a high resolution time stamp"),
444 this_mtime
+= FILE_TIMESTAMPS_PER_S
- 1 - ns
;
449 /* If file was specified as a target with no commands,
450 come up with some default commands. */
452 if (!file
->phony
&& file
->cmds
== 0 && !file
->tried_implicit
)
454 if (try_implicit_rule (file
, depth
))
455 DBF (DB_IMPLICIT
, _("Found an implicit rule for `%s'.\n"));
457 DBF (DB_IMPLICIT
, _("No implicit rule found for `%s'.\n"));
458 file
->tried_implicit
= 1;
460 if (file
->cmds
== 0 && !file
->is_target
461 && default_file
!= 0 && default_file
->cmds
!= 0)
463 DBF (DB_IMPLICIT
, _("Using default commands for `%s'.\n"));
464 file
->cmds
= default_file
->cmds
;
467 /* Update all non-intermediate files we depend on, if necessary,
468 and see whether any of them is more recent than this file. */
474 FILE_TIMESTAMP mtime
;
478 check_renamed (d
->file
);
480 mtime
= file_mtime (d
->file
);
481 check_renamed (d
->file
);
483 if (is_updating (d
->file
))
485 error (NILF
, _("Circular %s <- %s dependency dropped."),
486 file
->name
, d
->file
->name
);
487 /* We cannot free D here because our the caller will still have
488 a reference to it when we were called recursively via
491 file
->deps
= d
->next
;
493 lastd
->next
= d
->next
;
498 d
->file
->parent
= file
;
499 maybe_make
= must_make
;
501 /* Inherit dontcare flag from our parent. */
502 if (rebuilding_makefiles
)
504 dontcare
= d
->file
->dontcare
;
505 d
->file
->dontcare
= file
->dontcare
;
509 dep_status
|= check_dep (d
->file
, depth
, this_mtime
, &maybe_make
);
511 /* Restore original dontcare flag. */
512 if (rebuilding_makefiles
)
513 d
->file
->dontcare
= dontcare
;
515 if (! d
->ignore_mtime
)
516 must_make
= maybe_make
;
518 check_renamed (d
->file
);
521 register struct file
*f
= d
->file
;
526 running
|= (f
->command_state
== cs_running
527 || f
->command_state
== cs_deps_running
);
533 if (dep_status
!= 0 && !keep_going_flag
)
537 /* The prereq is considered changed if the timestamp has changed while
538 it was built, OR it doesn't exist. */
539 d
->changed
= ((file_mtime (d
->file
) != mtime
)
540 || (mtime
== NONEXISTENT_MTIME
));
546 /* Now we know whether this target needs updating.
547 If it does, update all the intermediate files we depend on. */
549 if (must_make
|| always_make_flag
)
551 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
552 if (d
->file
->intermediate
)
556 FILE_TIMESTAMP mtime
= file_mtime (d
->file
);
557 check_renamed (d
->file
);
558 d
->file
->parent
= file
;
560 /* Inherit dontcare flag from our parent. */
561 if (rebuilding_makefiles
)
563 dontcare
= d
->file
->dontcare
;
564 d
->file
->dontcare
= file
->dontcare
;
568 dep_status
|= update_file (d
->file
, depth
);
570 /* Restore original dontcare flag. */
571 if (rebuilding_makefiles
)
572 d
->file
->dontcare
= dontcare
;
574 check_renamed (d
->file
);
577 register struct file
*f
= d
->file
;
582 running
|= (f
->command_state
== cs_running
583 || f
->command_state
== cs_deps_running
);
589 if (dep_status
!= 0 && !keep_going_flag
)
593 d
->changed
= ((file
->phony
&& file
->cmds
!= 0)
594 || file_mtime (d
->file
) != mtime
);
598 finish_updating (file
);
600 DBF (DB_VERBOSE
, _("Finished prerequisites of target file `%s'.\n"));
604 set_command_state (file
, cs_deps_running
);
606 DBF (DB_VERBOSE
, _("The prerequisites of `%s' are being made.\n"));
610 /* If any dependency failed, give up now. */
614 file
->update_status
= dep_status
;
615 notice_finished_file (file
);
619 DBF (DB_VERBOSE
, _("Giving up on target file `%s'.\n"));
621 if (depth
== 0 && keep_going_flag
622 && !just_print_flag
&& !question_flag
)
624 _("Target `%s' not remade because of errors."), file
->name
);
629 if (file
->command_state
== cs_deps_running
)
630 /* The commands for some deps were running on the last iteration, but
631 they have finished now. Reset the command_state to not_started to
632 simplify later bookkeeping. It is important that we do this only
633 when the prior state was cs_deps_running, because that prior state
634 was definitely propagated to FILE's also_make's by set_command_state
635 (called above), but in another state an also_make may have
636 independently changed to finished state, and we would confuse that
637 file's bookkeeping (updated, but not_started is bogus state). */
638 set_command_state (file
, cs_not_started
);
640 /* Now record which prerequisites are more
641 recent than this file, so we can define $?. */
644 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
646 FILE_TIMESTAMP d_mtime
= file_mtime (d
->file
);
647 check_renamed (d
->file
);
649 if (! d
->ignore_mtime
)
652 /* %%% In version 4, remove this code completely to
653 implement not remaking deps if their deps are newer
654 than their parents. */
655 if (d_mtime
== NONEXISTENT_MTIME
&& !d
->file
->intermediate
)
656 /* We must remake if this dep does not
657 exist and is not intermediate. */
661 /* Set DEPS_CHANGED if this dep actually changed. */
662 deps_changed
|= d
->changed
;
665 /* Set D->changed if either this dep actually changed,
666 or its dependent, FILE, is older or does not exist. */
667 d
->changed
|= noexist
|| d_mtime
> this_mtime
;
669 if (!noexist
&& ISDB (DB_BASIC
|DB_VERBOSE
))
675 if (ISDB (DB_VERBOSE
))
676 fmt
= _("Prerequisite `%s' is order-only for target `%s'.\n");
678 else if (d_mtime
== NONEXISTENT_MTIME
)
681 fmt
= _("Prerequisite `%s' of target `%s' does not exist.\n");
686 fmt
= _("Prerequisite `%s' is newer than target `%s'.\n");
688 else if (ISDB (DB_VERBOSE
))
689 fmt
= _("Prerequisite `%s' is older than target `%s'.\n");
693 print_spaces (depth
);
694 printf (fmt
, dep_name (d
), file
->name
);
700 /* Here depth returns to the value it had when we were called. */
703 if (file
->double_colon
&& file
->deps
== 0)
707 _("Target `%s' is double-colon and has no prerequisites.\n"));
709 else if (!noexist
&& file
->is_target
&& !deps_changed
&& file
->cmds
== 0
710 && !always_make_flag
)
714 _("No commands for `%s' and no prerequisites actually changed.\n"));
716 else if (!must_make
&& file
->cmds
!= 0 && always_make_flag
)
719 DBF (DB_VERBOSE
, _("Making `%s' due to always-make flag.\n"));
724 if (ISDB (DB_VERBOSE
))
726 print_spaces (depth
);
727 printf (_("No need to remake target `%s'"), file
->name
);
728 if (!streq (file
->name
, file
->hname
))
729 printf (_("; using VPATH name `%s'"), file
->hname
);
734 notice_finished_file (file
);
736 /* Since we don't need to remake the file, convert it to use the
737 VPATH filename if we found one. hfile will be either the
738 local name if no VPATH or the VPATH name if one was found. */
742 file
->name
= file
->hname
;
749 DBF (DB_BASIC
, _("Must remake target `%s'.\n"));
751 /* It needs to be remade. If it's VPATH and not reset via GPATH, toss the
753 if (!streq(file
->name
, file
->hname
))
755 DB (DB_BASIC
, (_(" Ignoring VPATH name `%s'.\n"), file
->hname
));
756 file
->ignore_vpath
= 1;
759 /* Now, take appropriate actions to remake the file. */
762 if (file
->command_state
!= cs_finished
)
764 DBF (DB_VERBOSE
, _("Commands of `%s' are being run.\n"));
768 switch (file
->update_status
)
771 DBF (DB_BASIC
, _("Failed to remake target file `%s'.\n"));
774 DBF (DB_BASIC
, _("Successfully remade target file `%s'.\n"));
777 DBF (DB_BASIC
, _("Target file `%s' needs remade under -q.\n"));
780 assert (file
->update_status
>= 0 && file
->update_status
<= 2);
785 return file
->update_status
;
788 /* Set FILE's `updated' flag and re-check its mtime and the mtime's of all
789 files listed in its `also_make' member. Under -t, this function also
792 On return, FILE->update_status will no longer be -1 if it was. */
795 notice_finished_file (struct file
*file
)
798 int ran
= file
->command_state
== cs_running
;
801 file
->command_state
= cs_finished
;
805 /* The update status will be:
806 -1 if this target was not remade;
807 0 if 0 or more commands (+ or ${MAKE}) were run and won;
808 1 if some commands were run and lost.
809 We touch the target if it has commands which either were not run
810 or won when they ran (i.e. status is 0). */
811 && file
->update_status
== 0)
813 if (file
->cmds
!= 0 && file
->cmds
->any_recurse
)
815 /* If all the command lines were recursive,
816 we don't want to do the touching. */
818 for (i
= 0; i
< file
->cmds
->ncommand_lines
; ++i
)
819 if (!(file
->cmds
->lines_flags
[i
] & COMMANDS_RECURSE
))
820 goto have_nonrecursing
;
826 file
->update_status
= 0;
827 /* According to POSIX, -t doesn't affect targets with no cmds. */
828 else if (file
->cmds
!= 0)
830 /* Should set file's modification date and do nothing else. */
831 file
->update_status
= touch_file (file
);
833 /* Pretend we ran a real touch command, to suppress the
834 "`foo' is up to date" message. */
837 /* Request for the timestamp to be updated (and distributed
838 to the double-colon entries). Simply setting ran=1 would
839 almost have done the trick, but messes up with the also_make
840 updating logic below. */
846 if (file
->mtime_before_update
== UNKNOWN_MTIME
)
847 file
->mtime_before_update
= file
->last_mtime
;
849 if ((ran
&& !file
->phony
) || touched
)
853 /* If -n, -t, or -q and all the commands are recursive, we ran them so
854 really check the target's mtime again. Otherwise, assume the target
855 would have been updated. */
857 if (question_flag
|| just_print_flag
|| touch_flag
)
859 for (i
= file
->cmds
->ncommand_lines
; i
> 0; --i
)
860 if (! (file
->cmds
->lines_flags
[i
-1] & COMMANDS_RECURSE
))
864 /* If there were no commands at all, it's always new. */
866 else if (file
->is_target
&& file
->cmds
== 0)
869 file
->last_mtime
= i
== 0 ? UNKNOWN_MTIME
: NEW_MTIME
;
872 if (file
->double_colon
)
874 /* If this is a double colon rule and it is the last one to be
875 updated, propagate the change of modification time to all the
876 double-colon entries for this file.
878 We do it on the last update because it is important to handle
879 individual entries as separate rules with separate timestamps
880 while they are treated as targets and then as one rule with the
881 unified timestamp when they are considered as a prerequisite
885 FILE_TIMESTAMP max_mtime
= file
->last_mtime
;
887 /* Check that all rules were updated and at the same time find
888 the max timestamp. We assume UNKNOWN_MTIME is newer then
890 for (f
= file
->double_colon
; f
!= 0 && f
->updated
; f
= f
->prev
)
891 if (max_mtime
!= UNKNOWN_MTIME
892 && (f
->last_mtime
== UNKNOWN_MTIME
|| f
->last_mtime
> max_mtime
))
893 max_mtime
= f
->last_mtime
;
896 for (f
= file
->double_colon
; f
!= 0; f
= f
->prev
)
897 f
->last_mtime
= max_mtime
;
900 if (ran
&& file
->update_status
!= -1)
901 /* We actually tried to update FILE, which has
902 updated its also_make's as well (if it worked).
903 If it didn't work, it wouldn't work again for them.
904 So mark them as updated with the same status. */
905 for (d
= file
->also_make
; d
!= 0; d
= d
->next
)
907 d
->file
->command_state
= cs_finished
;
908 d
->file
->updated
= 1;
909 d
->file
->update_status
= file
->update_status
;
911 if (ran
&& !d
->file
->phony
)
912 /* Fetch the new modification time.
913 We do this instead of just invalidating the cached time
914 so that a vpath_search can happen. Otherwise, it would
915 never be done because the target is already updated. */
916 f_mtime (d
->file
, 0);
918 else if (file
->update_status
== -1)
919 /* Nothing was done for FILE, but it needed nothing done.
920 So mark it now as "succeeded". */
921 file
->update_status
= 0;
924 /* Check whether another file (whose mtime is THIS_MTIME) needs updating on
925 account of a dependency which is file FILE. If it does, store 1 in
926 *MUST_MAKE_PTR. In the process, update any non-intermediate files that
927 FILE depends on (including FILE itself). Return nonzero if any updating
931 check_dep (struct file
*file
, unsigned int depth
,
932 FILE_TIMESTAMP this_mtime
, int *must_make_ptr
)
938 start_updating (file
);
940 if (file
->phony
|| !file
->intermediate
)
942 /* If this is a non-intermediate file, update it and record whether it
943 is newer than THIS_MTIME. */
944 FILE_TIMESTAMP mtime
;
945 dep_status
= update_file (file
, depth
);
946 check_renamed (file
);
947 mtime
= file_mtime (file
);
948 check_renamed (file
);
949 if (mtime
== NONEXISTENT_MTIME
|| mtime
> this_mtime
)
954 /* FILE is an intermediate file. */
955 FILE_TIMESTAMP mtime
;
957 if (!file
->phony
&& file
->cmds
== 0 && !file
->tried_implicit
)
959 if (try_implicit_rule (file
, depth
))
960 DBF (DB_IMPLICIT
, _("Found an implicit rule for `%s'.\n"));
962 DBF (DB_IMPLICIT
, _("No implicit rule found for `%s'.\n"));
963 file
->tried_implicit
= 1;
965 if (file
->cmds
== 0 && !file
->is_target
966 && default_file
!= 0 && default_file
->cmds
!= 0)
968 DBF (DB_IMPLICIT
, _("Using default commands for `%s'.\n"));
969 file
->cmds
= default_file
->cmds
;
972 check_renamed (file
);
973 mtime
= file_mtime (file
);
974 check_renamed (file
);
975 if (mtime
!= NONEXISTENT_MTIME
&& mtime
> this_mtime
)
976 /* If the intermediate file actually exists and is newer, then we
977 should remake from it. */
981 /* Otherwise, update all non-intermediate files we depend on, if
982 necessary, and see whether any of them is more recent than the
983 file on whose behalf we are checking. */
985 int deps_running
= 0;
987 /* Reset this target's state so that we check it fresh. It could be
988 that it's already been checked as part of an order-only
989 prerequisite and so wasn't rebuilt then, but should be now. */
990 set_command_state (file
, cs_not_started
);
998 if (is_updating (d
->file
))
1000 error (NILF
, _("Circular %s <- %s dependency dropped."),
1001 file
->name
, d
->file
->name
);
1004 file
->deps
= d
->next
;
1010 lastd
->next
= d
->next
;
1017 d
->file
->parent
= file
;
1018 maybe_make
= *must_make_ptr
;
1019 dep_status
|= check_dep (d
->file
, depth
, this_mtime
,
1021 if (! d
->ignore_mtime
)
1022 *must_make_ptr
= maybe_make
;
1023 check_renamed (d
->file
);
1024 if (dep_status
!= 0 && !keep_going_flag
)
1027 if (d
->file
->command_state
== cs_running
1028 || d
->file
->command_state
== cs_deps_running
)
1036 /* Record that some of FILE's deps are still being made.
1037 This tells the upper levels to wait on processing it until the
1038 commands are finished. */
1039 set_command_state (file
, cs_deps_running
);
1043 finish_updating (file
);
1047 /* Touch FILE. Return zero if successful, one if not. */
1049 #define TOUCH_ERROR(call) return (perror_with_name (call, file->name), 1)
1052 touch_file (struct file
*file
)
1055 message (0, "touch %s", file
->name
);
1058 if (ar_name (file
->name
))
1059 return ar_touch (file
->name
);
1063 int fd
= open (file
->name
, O_RDWR
| O_CREAT
, 0666);
1066 TOUCH_ERROR ("touch: open: ");
1069 struct stat statbuf
;
1073 EINTRLOOP (e
, fstat (fd
, &statbuf
));
1075 TOUCH_ERROR ("touch: fstat: ");
1076 /* Rewrite character 0 same as it already is. */
1077 if (read (fd
, &buf
, 1) < 0)
1078 TOUCH_ERROR ("touch: read: ");
1079 if (lseek (fd
, 0L, 0) < 0L)
1080 TOUCH_ERROR ("touch: lseek: ");
1081 if (write (fd
, &buf
, 1) < 0)
1082 TOUCH_ERROR ("touch: write: ");
1083 /* If file length was 0, we just
1084 changed it, so change it back. */
1085 if (statbuf
.st_size
== 0)
1088 fd
= open (file
->name
, O_RDWR
| O_TRUNC
, 0666);
1090 TOUCH_ERROR ("touch: open: ");
1099 /* Having checked and updated the dependencies of FILE,
1100 do whatever is appropriate to remake FILE itself.
1101 Return the status from executing FILE's commands. */
1104 remake_file (struct file
*file
)
1106 if (file
->cmds
== 0)
1109 /* Phony target. Pretend it succeeded. */
1110 file
->update_status
= 0;
1111 else if (file
->is_target
)
1112 /* This is a nonexistent target file we cannot make.
1113 Pretend it was successfully remade. */
1114 file
->update_status
= 0;
1117 /* This is a dependency file we cannot remake. Fail. */
1118 if (!rebuilding_makefiles
|| !file
->dontcare
)
1120 file
->update_status
= 2;
1125 chop_commands (file
->cmds
);
1127 /* The normal case: start some commands. */
1128 if (!touch_flag
|| file
->cmds
->any_recurse
)
1130 execute_file_commands (file
);
1134 /* This tells notice_finished_file it is ok to touch the file. */
1135 file
->update_status
= 0;
1138 /* This does the touching under -t. */
1139 notice_finished_file (file
);
1142 /* Return the mtime of a file, given a `struct file'.
1143 Caches the time in the struct file to avoid excess stat calls.
1145 If the file is not found, and SEARCH is nonzero, VPATH searching and
1146 replacement is done. If that fails, a library (-lLIBNAME) is tried and
1147 the library's actual name (/lib/libLIBNAME.a, etc.) is substituted into
1151 f_mtime (struct file
*file
, int search
)
1153 FILE_TIMESTAMP mtime
;
1155 /* File's mtime is not known; must get it from the system. */
1158 if (ar_name (file
->name
))
1160 /* This file is an archive-member reference. */
1162 char *arname
, *memname
;
1163 struct file
*arfile
;
1166 /* Find the archive's name. */
1167 ar_parse_name (file
->name
, &arname
, &memname
);
1169 /* Find the modification time of the archive itself.
1170 Also allow for its name to be changed via VPATH search. */
1171 arfile
= lookup_file (arname
);
1173 arfile
= enter_file (strcache_add (arname
));
1174 mtime
= f_mtime (arfile
, search
);
1175 check_renamed (arfile
);
1176 if (search
&& strcmp (arfile
->hname
, arname
))
1178 /* The archive's name has changed.
1179 Change the archive-member reference accordingly. */
1182 unsigned int arlen
, memlen
;
1184 arlen
= strlen (arfile
->hname
);
1185 memlen
= strlen (memname
);
1187 name
= xmalloc (arlen
+ 1 + memlen
+ 2);
1188 memcpy (name
, arfile
->hname
, arlen
);
1190 memcpy (name
+ arlen
+ 1, memname
, memlen
);
1191 name
[arlen
+ 1 + memlen
] = ')';
1192 name
[arlen
+ 1 + memlen
+ 1] = '\0';
1194 /* If the archive was found with GPATH, make the change permanent;
1195 otherwise defer it until later. */
1196 if (arfile
->name
== arfile
->hname
)
1197 rename_file (file
, name
);
1199 rehash_file (file
, name
);
1200 check_renamed (file
);
1205 file
->low_resolution_time
= 1;
1207 if (mtime
== NONEXISTENT_MTIME
)
1208 /* The archive doesn't exist, so its members don't exist either. */
1209 return NONEXISTENT_MTIME
;
1211 member_date
= ar_member_date (file
->hname
);
1212 mtime
= (member_date
== (time_t) -1
1214 : file_timestamp_cons (file
->hname
, member_date
, 0));
1219 mtime
= name_mtime (file
->name
);
1221 if (mtime
== NONEXISTENT_MTIME
&& search
&& !file
->ignore_vpath
)
1223 /* If name_mtime failed, search VPATH. */
1224 const char *name
= vpath_search (file
->name
, &mtime
);
1226 /* Last resort, is it a library (-lxxx)? */
1227 || (file
->name
[0] == '-' && file
->name
[1] == 'l'
1228 && (name
= library_search (file
->name
, &mtime
)) != 0))
1230 if (mtime
!= UNKNOWN_MTIME
)
1231 /* vpath_search and library_search store UNKNOWN_MTIME
1232 if they didn't need to do a stat call for their work. */
1233 file
->last_mtime
= mtime
;
1235 /* If we found it in VPATH, see if it's in GPATH too; if so,
1236 change the name right now; if not, defer until after the
1237 dependencies are updated. */
1238 if (gpath_search (name
, strlen(name
) - strlen(file
->name
) - 1))
1240 rename_file (file
, name
);
1241 check_renamed (file
);
1242 return file_mtime (file
);
1245 rehash_file (file
, name
);
1246 check_renamed (file
);
1247 /* If the result of a vpath search is -o or -W, preserve it.
1248 Otherwise, find the mtime of the resulting file. */
1249 if (mtime
!= OLD_MTIME
&& mtime
!= NEW_MTIME
)
1250 mtime
= name_mtime (name
);
1255 /* Files can have bogus timestamps that nothing newly made will be
1256 "newer" than. Updating their dependents could just result in loops.
1257 So notify the user of the anomaly with a warning.
1259 We only need to do this once, for now. */
1261 if (!clock_skew_detected
1262 && mtime
!= NONEXISTENT_MTIME
&& mtime
!= NEW_MTIME
1265 static FILE_TIMESTAMP adjusted_now
;
1267 FILE_TIMESTAMP adjusted_mtime
= mtime
;
1269 #if defined(WINDOWS32) || defined(__MSDOS__)
1270 /* Experimentation has shown that FAT filesystems can set file times
1271 up to 3 seconds into the future! Play it safe. */
1273 #define FAT_ADJ_OFFSET (FILE_TIMESTAMP) 3
1275 FILE_TIMESTAMP adjustment
= FAT_ADJ_OFFSET
<< FILE_TIMESTAMP_LO_BITS
;
1276 if (ORDINARY_MTIME_MIN
+ adjustment
<= adjusted_mtime
)
1277 adjusted_mtime
-= adjustment
;
1278 #elif defined(__EMX__)
1279 /* FAT filesystems round time to the nearest even second!
1280 Allow for any file (NTFS or FAT) to perhaps suffer from this
1282 FILE_TIMESTAMP adjustment
= (((FILE_TIMESTAMP_S (adjusted_mtime
) & 1) == 0
1283 && FILE_TIMESTAMP_NS (adjusted_mtime
) == 0)
1284 ? (FILE_TIMESTAMP
) 1 << FILE_TIMESTAMP_LO_BITS
1288 /* If the file's time appears to be in the future, update our
1289 concept of the present and try once more. */
1290 if (adjusted_now
< adjusted_mtime
)
1293 FILE_TIMESTAMP now
= file_timestamp_now (&resolution
);
1294 adjusted_now
= now
+ (resolution
- 1);
1295 if (adjusted_now
< adjusted_mtime
)
1298 error (NILF
, _("Warning: File `%s' has modification time in the future"),
1302 (FILE_TIMESTAMP_S (mtime
) - FILE_TIMESTAMP_S (now
)
1303 + ((FILE_TIMESTAMP_NS (mtime
) - FILE_TIMESTAMP_NS (now
))
1305 error (NILF
, _("Warning: File `%s' has modification time %.2g s in the future"),
1306 file
->name
, from_now
);
1308 clock_skew_detected
= 1;
1313 /* Store the mtime into all the entries for this file. */
1314 if (file
->double_colon
)
1315 file
= file
->double_colon
;
1319 /* If this file is not implicit but it is intermediate then it was
1320 made so by the .INTERMEDIATE target. If this file has never
1321 been built by us but was found now, it existed before make
1322 started. So, turn off the intermediate bit so make doesn't
1323 delete it, since it didn't create it. */
1324 if (mtime
!= NONEXISTENT_MTIME
&& file
->command_state
== cs_not_started
1325 && file
->command_state
== cs_not_started
1326 && !file
->tried_implicit
&& file
->intermediate
)
1327 file
->intermediate
= 0;
1329 file
->last_mtime
= mtime
;
1338 /* Return the mtime of the file or archive-member reference NAME. */
1340 /* First, we check with stat(). If the file does not exist, then we return
1341 NONEXISTENT_MTIME. If it does, and the symlink check flag is set, then
1342 examine each indirection of the symlink and find the newest mtime.
1343 This causes one duplicate stat() when -L is being used, but the code is
1346 static FILE_TIMESTAMP
1347 name_mtime (const char *name
)
1349 FILE_TIMESTAMP mtime
;
1353 EINTRLOOP (e
, stat (name
, &st
));
1355 mtime
= FILE_TIMESTAMP_STAT_MODTIME (name
, st
);
1356 else if (errno
== ENOENT
|| errno
== ENOTDIR
)
1357 mtime
= NONEXISTENT_MTIME
;
1360 perror_with_name ("stat: ", name
);
1361 return NONEXISTENT_MTIME
;
1364 /* If we get here we either found it, or it doesn't exist.
1365 If it doesn't exist see if we can use a symlink mtime instead. */
1367 #ifdef MAKE_SYMLINKS
1369 # define S_ISLNK(_m) (((_m)&S_IFMT)==S_IFLNK)
1371 if (check_symlink_flag
)
1375 /* Check each symbolic link segment (if any). Find the latest mtime
1376 amongst all of them (and the target file of course).
1377 Note that we have already successfully dereferenced all the links
1378 above. So, if we run into any error trying to lstat(), or
1379 readlink(), or whatever, something bizarre-o happened. Just give up
1380 and use whatever mtime we've already computed at that point. */
1381 strcpy (lpath
, name
);
1384 FILE_TIMESTAMP ltime
;
1389 EINTRLOOP (e
, lstat (lpath
, &st
));
1392 /* Just take what we have so far. */
1393 if (errno
!= ENOENT
&& errno
!= ENOTDIR
)
1394 perror_with_name ("lstat: ", lpath
);
1398 /* If this is not a symlink, we're done (we started with the real
1399 file's mtime so we don't need to test it again). */
1400 if (!S_ISLNK (st
.st_mode
))
1403 /* If this mtime is newer than what we had, keep the new one. */
1404 ltime
= FILE_TIMESTAMP_STAT_MODTIME (lpath
, st
);
1408 /* Set up to check the file pointed to by this link. */
1409 EINTRLOOP (llen
, readlink (lpath
, lbuf
, GET_PATH_MAX
));
1412 /* Eh? Just take what we have. */
1413 perror_with_name ("readlink: ", lpath
);
1418 /* If the target is fully-qualified or the source is just a
1419 filename, then the new path is the target. Otherwise it's the
1420 source directory plus the target. */
1421 if (lbuf
[0] == '/' || (p
= strrchr (lpath
, '/')) == NULL
)
1422 strcpy (lpath
, lbuf
);
1423 else if ((p
- lpath
) + llen
+ 2 > GET_PATH_MAX
)
1424 /* Eh? Path too long! Again, just go with what we have. */
1427 /* Create the next step in the symlink chain. */
1437 /* Search for a library file specified as -lLIBNAME, searching for a
1438 suitable library file in the system library directories and the VPATH
1442 library_search (const char *lib
, FILE_TIMESTAMP
*mtime_ptr
)
1444 static char *dirs
[] =
1450 #if defined(WINDOWS32) && !defined(LIBDIR)
1452 * This is completely up to the user at product install time. Just define
1457 LIBDIR
, /* Defined by configuration. */
1461 static char *libpatterns
= NULL
;
1463 const char *libname
= lib
+2; /* Name without the '-l'. */
1464 FILE_TIMESTAMP mtime
;
1466 /* Loop variables for the libpatterns value. */
1473 /* If we don't have libpatterns, get it. */
1476 int save
= warn_undefined_variables_flag
;
1477 warn_undefined_variables_flag
= 0;
1479 libpatterns
= xstrdup (variable_expand ("$(strip $(.LIBPATTERNS))"));
1481 warn_undefined_variables_flag
= save
;
1484 /* Loop through all the patterns in .LIBPATTERNS, and search on each one. */
1486 while ((p
= find_next_token (&p2
, &len
)) != 0)
1488 static char *buf
= NULL
;
1489 static unsigned int buflen
= 0;
1490 static int libdir_maxlen
= -1;
1491 char *libbuf
= variable_expand ("");
1493 /* Expand the pattern using LIBNAME as a replacement. */
1499 p3
= find_percent (p
);
1502 /* Give a warning if there is no pattern, then remove the
1503 pattern so it's ignored next time. */
1504 error (NILF
, _(".LIBPATTERNS element `%s' is not a pattern"), p
);
1505 for (; len
; --len
, ++p
)
1510 p4
= variable_buffer_output (libbuf
, p
, p3
-p
);
1511 p4
= variable_buffer_output (p4
, libname
, strlen (libname
));
1512 p4
= variable_buffer_output (p4
, p3
+1, len
- (p3
-p
));
1516 /* Look first for `libNAME.a' in the current directory. */
1517 mtime
= name_mtime (libbuf
);
1518 if (mtime
!= NONEXISTENT_MTIME
)
1522 return strcache_add (libbuf
);
1525 /* Now try VPATH search on that. */
1528 const char *file
= vpath_search (libbuf
, mtime_ptr
);
1533 /* Now try the standard set of directories. */
1537 for (dp
= dirs
; *dp
!= 0; ++dp
)
1539 int l
= strlen (*dp
);
1540 if (l
> libdir_maxlen
)
1543 buflen
= strlen (libbuf
);
1544 buf
= xmalloc(libdir_maxlen
+ buflen
+ 2);
1546 else if (buflen
< strlen (libbuf
))
1548 buflen
= strlen (libbuf
);
1549 buf
= xrealloc (buf
, libdir_maxlen
+ buflen
+ 2);
1552 for (dp
= dirs
; *dp
!= 0; ++dp
)
1554 sprintf (buf
, "%s/%s", *dp
, libbuf
);
1555 mtime
= name_mtime (buf
);
1556 if (mtime
!= NONEXISTENT_MTIME
)
1560 return strcache_add (buf
);