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 FILE_TIMESTAMP this_mtime
;
374 int noexist
, must_make
, deps_changed
;
380 DBF (DB_VERBOSE
, _("Considering target file `%s'.\n"));
384 if (file
->update_status
> 0)
387 _("Recently tried and failed to update file `%s'.\n"));
389 /* If the file we tried to make is marked dontcare then no message
390 was printed about it when it failed during the makefile rebuild.
391 If we're trying to build it again in the normal rebuild, print a
393 if (file
->dontcare
&& !rebuilding_makefiles
)
399 return file
->update_status
;
402 DBF (DB_VERBOSE
, _("File `%s' was considered already.\n"));
406 switch (file
->command_state
)
409 case cs_deps_running
:
412 DBF (DB_VERBOSE
, _("Still updating file `%s'.\n"));
415 DBF (DB_VERBOSE
, _("Finished updating file `%s'.\n"));
416 return file
->update_status
;
423 /* Notice recursive update of the same file. */
424 start_updating (file
);
426 /* Looking at the file's modtime beforehand allows the possibility
427 that its name may be changed by a VPATH search, and thus it may
428 not need an implicit rule. If this were not done, the file
429 might get implicit commands that apply to its initial name, only
430 to have that name replaced with another found by VPATH search. */
432 this_mtime
= file_mtime (file
);
433 check_renamed (file
);
434 noexist
= this_mtime
== NONEXISTENT_MTIME
;
436 DBF (DB_BASIC
, _("File `%s' does not exist.\n"));
437 else if (ORDINARY_MTIME_MIN
<= this_mtime
&& this_mtime
<= ORDINARY_MTIME_MAX
438 && file
->low_resolution_time
)
440 /* Avoid spurious rebuilds due to low resolution time stamps. */
441 int ns
= FILE_TIMESTAMP_NS (this_mtime
);
443 error (NILF
, _("*** Warning: .LOW_RESOLUTION_TIME file `%s' has a high resolution time stamp"),
445 this_mtime
+= FILE_TIMESTAMPS_PER_S
- 1 - ns
;
450 /* If file was specified as a target with no commands,
451 come up with some default commands. */
453 if (!file
->phony
&& file
->cmds
== 0 && !file
->tried_implicit
)
455 if (try_implicit_rule (file
, depth
))
456 DBF (DB_IMPLICIT
, _("Found an implicit rule for `%s'.\n"));
458 DBF (DB_IMPLICIT
, _("No implicit rule found for `%s'.\n"));
459 file
->tried_implicit
= 1;
461 if (file
->cmds
== 0 && !file
->is_target
462 && default_file
!= 0 && default_file
->cmds
!= 0)
464 DBF (DB_IMPLICIT
, _("Using default recipe for `%s'.\n"));
465 file
->cmds
= default_file
->cmds
;
468 /* Update all non-intermediate files we depend on, if necessary, and see
469 whether any of them is more recent than this file. We need to walk our
470 deps, AND the deps of any also_make targets to ensure everything happens
471 in the correct order. */
474 amake
.next
= file
->also_make
;
478 struct dep
*lastd
= 0;
480 /* Find the deps we're scanning */
486 FILE_TIMESTAMP mtime
;
490 check_renamed (d
->file
);
492 mtime
= file_mtime (d
->file
);
493 check_renamed (d
->file
);
495 if (is_updating (d
->file
))
497 error (NILF
, _("Circular %s <- %s dependency dropped."),
498 file
->name
, d
->file
->name
);
499 /* We cannot free D here because our the caller will still have
500 a reference to it when we were called recursively via
503 file
->deps
= d
->next
;
505 lastd
->next
= d
->next
;
510 d
->file
->parent
= file
;
511 maybe_make
= must_make
;
513 /* Inherit dontcare flag from our parent. */
514 if (rebuilding_makefiles
)
516 dontcare
= d
->file
->dontcare
;
517 d
->file
->dontcare
= file
->dontcare
;
520 dep_status
|= check_dep (d
->file
, depth
, this_mtime
, &maybe_make
);
522 /* Restore original dontcare flag. */
523 if (rebuilding_makefiles
)
524 d
->file
->dontcare
= dontcare
;
526 if (! d
->ignore_mtime
)
527 must_make
= maybe_make
;
529 check_renamed (d
->file
);
532 register struct file
*f
= d
->file
;
537 running
|= (f
->command_state
== cs_running
538 || f
->command_state
== cs_deps_running
);
544 if (dep_status
!= 0 && !keep_going_flag
)
548 /* The prereq is considered changed if the timestamp has changed while
549 it was built, OR it doesn't exist. */
550 d
->changed
= ((file_mtime (d
->file
) != mtime
)
551 || (mtime
== NONEXISTENT_MTIME
));
558 /* Now we know whether this target needs updating.
559 If it does, update all the intermediate files we depend on. */
561 if (must_make
|| always_make_flag
)
563 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
564 if (d
->file
->intermediate
)
568 FILE_TIMESTAMP mtime
= file_mtime (d
->file
);
569 check_renamed (d
->file
);
570 d
->file
->parent
= file
;
572 /* Inherit dontcare flag from our parent. */
573 if (rebuilding_makefiles
)
575 dontcare
= d
->file
->dontcare
;
576 d
->file
->dontcare
= file
->dontcare
;
580 dep_status
|= update_file (d
->file
, depth
);
582 /* Restore original dontcare flag. */
583 if (rebuilding_makefiles
)
584 d
->file
->dontcare
= dontcare
;
586 check_renamed (d
->file
);
589 register struct file
*f
= d
->file
;
594 running
|= (f
->command_state
== cs_running
595 || f
->command_state
== cs_deps_running
);
601 if (dep_status
!= 0 && !keep_going_flag
)
605 d
->changed
= ((file
->phony
&& file
->cmds
!= 0)
606 || file_mtime (d
->file
) != mtime
);
610 finish_updating (file
);
612 DBF (DB_VERBOSE
, _("Finished prerequisites of target file `%s'.\n"));
616 set_command_state (file
, cs_deps_running
);
618 DBF (DB_VERBOSE
, _("The prerequisites of `%s' are being made.\n"));
622 /* If any dependency failed, give up now. */
626 file
->update_status
= dep_status
;
627 notice_finished_file (file
);
631 DBF (DB_VERBOSE
, _("Giving up on target file `%s'.\n"));
633 if (depth
== 0 && keep_going_flag
634 && !just_print_flag
&& !question_flag
)
636 _("Target `%s' not remade because of errors."), file
->name
);
641 if (file
->command_state
== cs_deps_running
)
642 /* The commands for some deps were running on the last iteration, but
643 they have finished now. Reset the command_state to not_started to
644 simplify later bookkeeping. It is important that we do this only
645 when the prior state was cs_deps_running, because that prior state
646 was definitely propagated to FILE's also_make's by set_command_state
647 (called above), but in another state an also_make may have
648 independently changed to finished state, and we would confuse that
649 file's bookkeeping (updated, but not_started is bogus state). */
650 set_command_state (file
, cs_not_started
);
652 /* Now record which prerequisites are more
653 recent than this file, so we can define $?. */
656 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
658 FILE_TIMESTAMP d_mtime
= file_mtime (d
->file
);
659 check_renamed (d
->file
);
661 if (! d
->ignore_mtime
)
664 /* %%% In version 4, remove this code completely to
665 implement not remaking deps if their deps are newer
666 than their parents. */
667 if (d_mtime
== NONEXISTENT_MTIME
&& !d
->file
->intermediate
)
668 /* We must remake if this dep does not
669 exist and is not intermediate. */
673 /* Set DEPS_CHANGED if this dep actually changed. */
674 deps_changed
|= d
->changed
;
677 /* Set D->changed if either this dep actually changed,
678 or its dependent, FILE, is older or does not exist. */
679 d
->changed
|= noexist
|| d_mtime
> this_mtime
;
681 if (!noexist
&& ISDB (DB_BASIC
|DB_VERBOSE
))
687 if (ISDB (DB_VERBOSE
))
688 fmt
= _("Prerequisite `%s' is order-only for target `%s'.\n");
690 else if (d_mtime
== NONEXISTENT_MTIME
)
693 fmt
= _("Prerequisite `%s' of target `%s' does not exist.\n");
698 fmt
= _("Prerequisite `%s' is newer than target `%s'.\n");
700 else if (ISDB (DB_VERBOSE
))
701 fmt
= _("Prerequisite `%s' is older than target `%s'.\n");
705 print_spaces (depth
);
706 printf (fmt
, dep_name (d
), file
->name
);
712 /* Here depth returns to the value it had when we were called. */
715 if (file
->double_colon
&& file
->deps
== 0)
719 _("Target `%s' is double-colon and has no prerequisites.\n"));
721 else if (!noexist
&& file
->is_target
&& !deps_changed
&& file
->cmds
== 0
722 && !always_make_flag
)
726 _("No recipe for `%s' and no prerequisites actually changed.\n"));
728 else if (!must_make
&& file
->cmds
!= 0 && always_make_flag
)
731 DBF (DB_VERBOSE
, _("Making `%s' due to always-make flag.\n"));
736 if (ISDB (DB_VERBOSE
))
738 print_spaces (depth
);
739 printf (_("No need to remake target `%s'"), file
->name
);
740 if (!streq (file
->name
, file
->hname
))
741 printf (_("; using VPATH name `%s'"), file
->hname
);
746 notice_finished_file (file
);
748 /* Since we don't need to remake the file, convert it to use the
749 VPATH filename if we found one. hfile will be either the
750 local name if no VPATH or the VPATH name if one was found. */
754 file
->name
= file
->hname
;
761 DBF (DB_BASIC
, _("Must remake target `%s'.\n"));
763 /* It needs to be remade. If it's VPATH and not reset via GPATH, toss the
765 if (!streq(file
->name
, file
->hname
))
767 DB (DB_BASIC
, (_(" Ignoring VPATH name `%s'.\n"), file
->hname
));
768 file
->ignore_vpath
= 1;
771 /* Now, take appropriate actions to remake the file. */
774 if (file
->command_state
!= cs_finished
)
776 DBF (DB_VERBOSE
, _("Recipe of `%s' is being run.\n"));
780 switch (file
->update_status
)
783 DBF (DB_BASIC
, _("Failed to remake target file `%s'.\n"));
786 DBF (DB_BASIC
, _("Successfully remade target file `%s'.\n"));
789 DBF (DB_BASIC
, _("Target file `%s' needs remade under -q.\n"));
792 assert (file
->update_status
>= 0 && file
->update_status
<= 2);
797 return file
->update_status
;
800 /* Set FILE's `updated' flag and re-check its mtime and the mtime's of all
801 files listed in its `also_make' member. Under -t, this function also
804 On return, FILE->update_status will no longer be -1 if it was. */
807 notice_finished_file (struct file
*file
)
810 int ran
= file
->command_state
== cs_running
;
813 file
->command_state
= cs_finished
;
817 /* The update status will be:
818 -1 if this target was not remade;
819 0 if 0 or more commands (+ or ${MAKE}) were run and won;
820 1 if some commands were run and lost.
821 We touch the target if it has commands which either were not run
822 or won when they ran (i.e. status is 0). */
823 && file
->update_status
== 0)
825 if (file
->cmds
!= 0 && file
->cmds
->any_recurse
)
827 /* If all the command lines were recursive,
828 we don't want to do the touching. */
830 for (i
= 0; i
< file
->cmds
->ncommand_lines
; ++i
)
831 if (!(file
->cmds
->lines_flags
[i
] & COMMANDS_RECURSE
))
832 goto have_nonrecursing
;
838 file
->update_status
= 0;
839 /* According to POSIX, -t doesn't affect targets with no cmds. */
840 else if (file
->cmds
!= 0)
842 /* Should set file's modification date and do nothing else. */
843 file
->update_status
= touch_file (file
);
845 /* Pretend we ran a real touch command, to suppress the
846 "`foo' is up to date" message. */
849 /* Request for the timestamp to be updated (and distributed
850 to the double-colon entries). Simply setting ran=1 would
851 almost have done the trick, but messes up with the also_make
852 updating logic below. */
858 if (file
->mtime_before_update
== UNKNOWN_MTIME
)
859 file
->mtime_before_update
= file
->last_mtime
;
861 if ((ran
&& !file
->phony
) || touched
)
865 /* If -n, -t, or -q and all the commands are recursive, we ran them so
866 really check the target's mtime again. Otherwise, assume the target
867 would have been updated. */
869 if (question_flag
|| just_print_flag
|| touch_flag
)
871 for (i
= file
->cmds
->ncommand_lines
; i
> 0; --i
)
872 if (! (file
->cmds
->lines_flags
[i
-1] & COMMANDS_RECURSE
))
876 /* If there were no commands at all, it's always new. */
878 else if (file
->is_target
&& file
->cmds
== 0)
881 file
->last_mtime
= i
== 0 ? UNKNOWN_MTIME
: NEW_MTIME
;
884 if (file
->double_colon
)
886 /* If this is a double colon rule and it is the last one to be
887 updated, propagate the change of modification time to all the
888 double-colon entries for this file.
890 We do it on the last update because it is important to handle
891 individual entries as separate rules with separate timestamps
892 while they are treated as targets and then as one rule with the
893 unified timestamp when they are considered as a prerequisite
897 FILE_TIMESTAMP max_mtime
= file
->last_mtime
;
899 /* Check that all rules were updated and at the same time find
900 the max timestamp. We assume UNKNOWN_MTIME is newer then
902 for (f
= file
->double_colon
; f
!= 0 && f
->updated
; f
= f
->prev
)
903 if (max_mtime
!= UNKNOWN_MTIME
904 && (f
->last_mtime
== UNKNOWN_MTIME
|| f
->last_mtime
> max_mtime
))
905 max_mtime
= f
->last_mtime
;
908 for (f
= file
->double_colon
; f
!= 0; f
= f
->prev
)
909 f
->last_mtime
= max_mtime
;
912 if (ran
&& file
->update_status
!= -1)
913 /* We actually tried to update FILE, which has
914 updated its also_make's as well (if it worked).
915 If it didn't work, it wouldn't work again for them.
916 So mark them as updated with the same status. */
917 for (d
= file
->also_make
; d
!= 0; d
= d
->next
)
919 d
->file
->command_state
= cs_finished
;
920 d
->file
->updated
= 1;
921 d
->file
->update_status
= file
->update_status
;
923 if (ran
&& !d
->file
->phony
)
924 /* Fetch the new modification time.
925 We do this instead of just invalidating the cached time
926 so that a vpath_search can happen. Otherwise, it would
927 never be done because the target is already updated. */
928 f_mtime (d
->file
, 0);
930 else if (file
->update_status
== -1)
931 /* Nothing was done for FILE, but it needed nothing done.
932 So mark it now as "succeeded". */
933 file
->update_status
= 0;
936 /* Check whether another file (whose mtime is THIS_MTIME) needs updating on
937 account of a dependency which is file FILE. If it does, store 1 in
938 *MUST_MAKE_PTR. In the process, update any non-intermediate files that
939 FILE depends on (including FILE itself). Return nonzero if any updating
943 check_dep (struct file
*file
, unsigned int depth
,
944 FILE_TIMESTAMP this_mtime
, int *must_make_ptr
)
950 start_updating (file
);
952 if (file
->phony
|| !file
->intermediate
)
954 /* If this is a non-intermediate file, update it and record whether it
955 is newer than THIS_MTIME. */
956 FILE_TIMESTAMP mtime
;
957 dep_status
= update_file (file
, depth
);
958 check_renamed (file
);
959 mtime
= file_mtime (file
);
960 check_renamed (file
);
961 if (mtime
== NONEXISTENT_MTIME
|| mtime
> this_mtime
)
966 /* FILE is an intermediate file. */
967 FILE_TIMESTAMP mtime
;
969 if (!file
->phony
&& file
->cmds
== 0 && !file
->tried_implicit
)
971 if (try_implicit_rule (file
, depth
))
972 DBF (DB_IMPLICIT
, _("Found an implicit rule for `%s'.\n"));
974 DBF (DB_IMPLICIT
, _("No implicit rule found for `%s'.\n"));
975 file
->tried_implicit
= 1;
977 if (file
->cmds
== 0 && !file
->is_target
978 && default_file
!= 0 && default_file
->cmds
!= 0)
980 DBF (DB_IMPLICIT
, _("Using default commands for `%s'.\n"));
981 file
->cmds
= default_file
->cmds
;
984 check_renamed (file
);
985 mtime
= file_mtime (file
);
986 check_renamed (file
);
987 if (mtime
!= NONEXISTENT_MTIME
&& mtime
> this_mtime
)
988 /* If the intermediate file actually exists and is newer, then we
989 should remake from it. */
993 /* Otherwise, update all non-intermediate files we depend on, if
994 necessary, and see whether any of them is more recent than the
995 file on whose behalf we are checking. */
997 int deps_running
= 0;
999 /* If this target is not running, set it's state so that we check it
1000 fresh. It could be it was checked as part of an order-only
1001 prerequisite and so wasn't rebuilt then, but should be now. */
1002 if (file
->command_state
!= cs_running
)
1003 set_command_state (file
, cs_not_started
);
1011 if (is_updating (d
->file
))
1013 error (NILF
, _("Circular %s <- %s dependency dropped."),
1014 file
->name
, d
->file
->name
);
1017 file
->deps
= d
->next
;
1030 d
->file
->parent
= file
;
1031 maybe_make
= *must_make_ptr
;
1032 dep_status
|= check_dep (d
->file
, depth
, this_mtime
,
1034 if (! d
->ignore_mtime
)
1035 *must_make_ptr
= maybe_make
;
1036 check_renamed (d
->file
);
1037 if (dep_status
!= 0 && !keep_going_flag
)
1040 if (d
->file
->command_state
== cs_running
1041 || d
->file
->command_state
== cs_deps_running
)
1049 /* Record that some of FILE's deps are still being made.
1050 This tells the upper levels to wait on processing it until the
1051 commands are finished. */
1052 set_command_state (file
, cs_deps_running
);
1056 finish_updating (file
);
1060 /* Touch FILE. Return zero if successful, one if not. */
1062 #define TOUCH_ERROR(call) return (perror_with_name (call, file->name), 1)
1065 touch_file (struct file
*file
)
1068 message (0, "touch %s", file
->name
);
1071 if (ar_name (file
->name
))
1072 return ar_touch (file
->name
);
1076 int fd
= open (file
->name
, O_RDWR
| O_CREAT
, 0666);
1079 TOUCH_ERROR ("touch: open: ");
1082 struct stat statbuf
;
1086 EINTRLOOP (e
, fstat (fd
, &statbuf
));
1088 TOUCH_ERROR ("touch: fstat: ");
1089 /* Rewrite character 0 same as it already is. */
1090 if (read (fd
, &buf
, 1) < 0)
1091 TOUCH_ERROR ("touch: read: ");
1092 if (lseek (fd
, 0L, 0) < 0L)
1093 TOUCH_ERROR ("touch: lseek: ");
1094 if (write (fd
, &buf
, 1) < 0)
1095 TOUCH_ERROR ("touch: write: ");
1096 /* If file length was 0, we just
1097 changed it, so change it back. */
1098 if (statbuf
.st_size
== 0)
1101 fd
= open (file
->name
, O_RDWR
| O_TRUNC
, 0666);
1103 TOUCH_ERROR ("touch: open: ");
1112 /* Having checked and updated the dependencies of FILE,
1113 do whatever is appropriate to remake FILE itself.
1114 Return the status from executing FILE's commands. */
1117 remake_file (struct file
*file
)
1119 if (file
->cmds
== 0)
1122 /* Phony target. Pretend it succeeded. */
1123 file
->update_status
= 0;
1124 else if (file
->is_target
)
1125 /* This is a nonexistent target file we cannot make.
1126 Pretend it was successfully remade. */
1127 file
->update_status
= 0;
1130 /* This is a dependency file we cannot remake. Fail. */
1131 if (!rebuilding_makefiles
|| !file
->dontcare
)
1133 file
->update_status
= 2;
1138 chop_commands (file
->cmds
);
1140 /* The normal case: start some commands. */
1141 if (!touch_flag
|| file
->cmds
->any_recurse
)
1143 execute_file_commands (file
);
1147 /* This tells notice_finished_file it is ok to touch the file. */
1148 file
->update_status
= 0;
1151 /* This does the touching under -t. */
1152 notice_finished_file (file
);
1155 /* Return the mtime of a file, given a `struct file'.
1156 Caches the time in the struct file to avoid excess stat calls.
1158 If the file is not found, and SEARCH is nonzero, VPATH searching and
1159 replacement is done. If that fails, a library (-lLIBNAME) is tried and
1160 the library's actual name (/lib/libLIBNAME.a, etc.) is substituted into
1164 f_mtime (struct file
*file
, int search
)
1166 FILE_TIMESTAMP mtime
;
1168 /* File's mtime is not known; must get it from the system. */
1171 if (ar_name (file
->name
))
1173 /* This file is an archive-member reference. */
1175 char *arname
, *memname
;
1176 struct file
*arfile
;
1179 /* Find the archive's name. */
1180 ar_parse_name (file
->name
, &arname
, &memname
);
1182 /* Find the modification time of the archive itself.
1183 Also allow for its name to be changed via VPATH search. */
1184 arfile
= lookup_file (arname
);
1186 arfile
= enter_file (strcache_add (arname
));
1187 mtime
= f_mtime (arfile
, search
);
1188 check_renamed (arfile
);
1189 if (search
&& strcmp (arfile
->hname
, arname
))
1191 /* The archive's name has changed.
1192 Change the archive-member reference accordingly. */
1195 unsigned int arlen
, memlen
;
1197 arlen
= strlen (arfile
->hname
);
1198 memlen
= strlen (memname
);
1200 name
= xmalloc (arlen
+ 1 + memlen
+ 2);
1201 memcpy (name
, arfile
->hname
, arlen
);
1203 memcpy (name
+ arlen
+ 1, memname
, memlen
);
1204 name
[arlen
+ 1 + memlen
] = ')';
1205 name
[arlen
+ 1 + memlen
+ 1] = '\0';
1207 /* If the archive was found with GPATH, make the change permanent;
1208 otherwise defer it until later. */
1209 if (arfile
->name
== arfile
->hname
)
1210 rename_file (file
, name
);
1212 rehash_file (file
, name
);
1213 check_renamed (file
);
1218 file
->low_resolution_time
= 1;
1220 if (mtime
== NONEXISTENT_MTIME
)
1221 /* The archive doesn't exist, so its members don't exist either. */
1222 return NONEXISTENT_MTIME
;
1224 member_date
= ar_member_date (file
->hname
);
1225 mtime
= (member_date
== (time_t) -1
1227 : file_timestamp_cons (file
->hname
, member_date
, 0));
1232 mtime
= name_mtime (file
->name
);
1234 if (mtime
== NONEXISTENT_MTIME
&& search
&& !file
->ignore_vpath
)
1236 /* If name_mtime failed, search VPATH. */
1237 const char *name
= vpath_search (file
->name
, &mtime
);
1239 /* Last resort, is it a library (-lxxx)? */
1240 || (file
->name
[0] == '-' && file
->name
[1] == 'l'
1241 && (name
= library_search (file
->name
, &mtime
)) != 0))
1243 if (mtime
!= UNKNOWN_MTIME
)
1244 /* vpath_search and library_search store UNKNOWN_MTIME
1245 if they didn't need to do a stat call for their work. */
1246 file
->last_mtime
= mtime
;
1248 /* If we found it in VPATH, see if it's in GPATH too; if so,
1249 change the name right now; if not, defer until after the
1250 dependencies are updated. */
1251 if (gpath_search (name
, strlen(name
) - strlen(file
->name
) - 1))
1253 rename_file (file
, name
);
1254 check_renamed (file
);
1255 return file_mtime (file
);
1258 rehash_file (file
, name
);
1259 check_renamed (file
);
1260 /* If the result of a vpath search is -o or -W, preserve it.
1261 Otherwise, find the mtime of the resulting file. */
1262 if (mtime
!= OLD_MTIME
&& mtime
!= NEW_MTIME
)
1263 mtime
= name_mtime (name
);
1268 /* Files can have bogus timestamps that nothing newly made will be
1269 "newer" than. Updating their dependents could just result in loops.
1270 So notify the user of the anomaly with a warning.
1272 We only need to do this once, for now. */
1274 if (!clock_skew_detected
1275 && mtime
!= NONEXISTENT_MTIME
&& mtime
!= NEW_MTIME
1278 static FILE_TIMESTAMP adjusted_now
;
1280 FILE_TIMESTAMP adjusted_mtime
= mtime
;
1282 #if defined(WINDOWS32) || defined(__MSDOS__)
1283 /* Experimentation has shown that FAT filesystems can set file times
1284 up to 3 seconds into the future! Play it safe. */
1286 #define FAT_ADJ_OFFSET (FILE_TIMESTAMP) 3
1288 FILE_TIMESTAMP adjustment
= FAT_ADJ_OFFSET
<< FILE_TIMESTAMP_LO_BITS
;
1289 if (ORDINARY_MTIME_MIN
+ adjustment
<= adjusted_mtime
)
1290 adjusted_mtime
-= adjustment
;
1291 #elif defined(__EMX__)
1292 /* FAT filesystems round time to the nearest even second!
1293 Allow for any file (NTFS or FAT) to perhaps suffer from this
1295 FILE_TIMESTAMP adjustment
= (((FILE_TIMESTAMP_S (adjusted_mtime
) & 1) == 0
1296 && FILE_TIMESTAMP_NS (adjusted_mtime
) == 0)
1297 ? (FILE_TIMESTAMP
) 1 << FILE_TIMESTAMP_LO_BITS
1301 /* If the file's time appears to be in the future, update our
1302 concept of the present and try once more. */
1303 if (adjusted_now
< adjusted_mtime
)
1306 FILE_TIMESTAMP now
= file_timestamp_now (&resolution
);
1307 adjusted_now
= now
+ (resolution
- 1);
1308 if (adjusted_now
< adjusted_mtime
)
1311 error (NILF
, _("Warning: File `%s' has modification time in the future"),
1315 (FILE_TIMESTAMP_S (mtime
) - FILE_TIMESTAMP_S (now
)
1316 + ((FILE_TIMESTAMP_NS (mtime
) - FILE_TIMESTAMP_NS (now
))
1318 char from_now_string
[100];
1320 if (from_now
>= 99 && from_now
<= ULONG_MAX
)
1321 sprintf (from_now_string
, "%lu", (unsigned long) from_now
);
1323 sprintf (from_now_string
, "%.2g", from_now
);
1324 error (NILF
, _("Warning: File `%s' has modification time %s s in the future"),
1325 file
->name
, from_now_string
);
1327 clock_skew_detected
= 1;
1332 /* Store the mtime into all the entries for this file. */
1333 if (file
->double_colon
)
1334 file
= file
->double_colon
;
1338 /* If this file is not implicit but it is intermediate then it was
1339 made so by the .INTERMEDIATE target. If this file has never
1340 been built by us but was found now, it existed before make
1341 started. So, turn off the intermediate bit so make doesn't
1342 delete it, since it didn't create it. */
1343 if (mtime
!= NONEXISTENT_MTIME
&& file
->command_state
== cs_not_started
1344 && file
->command_state
== cs_not_started
1345 && !file
->tried_implicit
&& file
->intermediate
)
1346 file
->intermediate
= 0;
1348 file
->last_mtime
= mtime
;
1357 /* Return the mtime of the file or archive-member reference NAME. */
1359 /* First, we check with stat(). If the file does not exist, then we return
1360 NONEXISTENT_MTIME. If it does, and the symlink check flag is set, then
1361 examine each indirection of the symlink and find the newest mtime.
1362 This causes one duplicate stat() when -L is being used, but the code is
1365 static FILE_TIMESTAMP
1366 name_mtime (const char *name
)
1368 FILE_TIMESTAMP mtime
;
1372 EINTRLOOP (e
, stat (name
, &st
));
1374 mtime
= FILE_TIMESTAMP_STAT_MODTIME (name
, st
);
1375 else if (errno
== ENOENT
|| errno
== ENOTDIR
)
1376 mtime
= NONEXISTENT_MTIME
;
1379 perror_with_name ("stat: ", name
);
1380 return NONEXISTENT_MTIME
;
1383 /* If we get here we either found it, or it doesn't exist.
1384 If it doesn't exist see if we can use a symlink mtime instead. */
1386 #ifdef MAKE_SYMLINKS
1388 # define S_ISLNK(_m) (((_m)&S_IFMT)==S_IFLNK)
1390 if (check_symlink_flag
)
1394 /* Check each symbolic link segment (if any). Find the latest mtime
1395 amongst all of them (and the target file of course).
1396 Note that we have already successfully dereferenced all the links
1397 above. So, if we run into any error trying to lstat(), or
1398 readlink(), or whatever, something bizarre-o happened. Just give up
1399 and use whatever mtime we've already computed at that point. */
1400 strcpy (lpath
, name
);
1403 FILE_TIMESTAMP ltime
;
1408 EINTRLOOP (e
, lstat (lpath
, &st
));
1411 /* Just take what we have so far. */
1412 if (errno
!= ENOENT
&& errno
!= ENOTDIR
)
1413 perror_with_name ("lstat: ", lpath
);
1417 /* If this is not a symlink, we're done (we started with the real
1418 file's mtime so we don't need to test it again). */
1419 if (!S_ISLNK (st
.st_mode
))
1422 /* If this mtime is newer than what we had, keep the new one. */
1423 ltime
= FILE_TIMESTAMP_STAT_MODTIME (lpath
, st
);
1427 /* Set up to check the file pointed to by this link. */
1428 EINTRLOOP (llen
, readlink (lpath
, lbuf
, GET_PATH_MAX
));
1431 /* Eh? Just take what we have. */
1432 perror_with_name ("readlink: ", lpath
);
1437 /* If the target is fully-qualified or the source is just a
1438 filename, then the new path is the target. Otherwise it's the
1439 source directory plus the target. */
1440 if (lbuf
[0] == '/' || (p
= strrchr (lpath
, '/')) == NULL
)
1441 strcpy (lpath
, lbuf
);
1442 else if ((p
- lpath
) + llen
+ 2 > GET_PATH_MAX
)
1443 /* Eh? Path too long! Again, just go with what we have. */
1446 /* Create the next step in the symlink chain. */
1456 /* Search for a library file specified as -lLIBNAME, searching for a
1457 suitable library file in the system library directories and the VPATH
1461 library_search (const char *lib
, FILE_TIMESTAMP
*mtime_ptr
)
1463 static char *dirs
[] =
1469 #if defined(WINDOWS32) && !defined(LIBDIR)
1471 * This is completely up to the user at product install time. Just define
1476 LIBDIR
, /* Defined by configuration. */
1480 const char *file
= 0;
1482 FILE_TIMESTAMP mtime
;
1484 /* Loop variables for the libpatterns value. */
1488 unsigned int liblen
;
1492 libpatterns
= xstrdup (variable_expand ("$(.LIBPATTERNS)"));
1494 /* Skip the '-l'. */
1496 liblen
= strlen (lib
);
1498 /* Loop through all the patterns in .LIBPATTERNS, and search on each one. */
1500 while ((p
= find_next_token (&p2
, &len
)) != 0)
1502 static char *buf
= NULL
;
1503 static unsigned int buflen
= 0;
1504 static int libdir_maxlen
= -1;
1505 char *libbuf
= variable_expand ("");
1507 /* Expand the pattern using LIB as a replacement. */
1513 p3
= find_percent (p
);
1516 /* Give a warning if there is no pattern. */
1517 error (NILF
, _(".LIBPATTERNS element `%s' is not a pattern"), p
);
1521 p4
= variable_buffer_output (libbuf
, p
, p3
-p
);
1522 p4
= variable_buffer_output (p4
, lib
, liblen
);
1523 p4
= variable_buffer_output (p4
, p3
+1, len
- (p3
-p
));
1527 /* Look first for `libNAME.a' in the current directory. */
1528 mtime
= name_mtime (libbuf
);
1529 if (mtime
!= NONEXISTENT_MTIME
)
1533 file
= strcache_add (libbuf
);
1537 /* Now try VPATH search on that. */
1540 file
= vpath_search (libbuf
, mtime_ptr
);
1545 /* Now try the standard set of directories. */
1549 for (dp
= dirs
; *dp
!= 0; ++dp
)
1551 int l
= strlen (*dp
);
1552 if (l
> libdir_maxlen
)
1555 buflen
= strlen (libbuf
);
1556 buf
= xmalloc(libdir_maxlen
+ buflen
+ 2);
1558 else if (buflen
< strlen (libbuf
))
1560 buflen
= strlen (libbuf
);
1561 buf
= xrealloc (buf
, libdir_maxlen
+ buflen
+ 2);
1564 for (dp
= dirs
; *dp
!= 0; ++dp
)
1566 sprintf (buf
, "%s/%s", *dp
, libbuf
);
1567 mtime
= name_mtime (buf
);
1568 if (mtime
!= NONEXISTENT_MTIME
)
1572 file
= strcache_add (buf
);