1 /* Basic dependency engine for GNU Make.
2 Copyright (C) 1988,89,90,91,92,93,94,95,96,97,99 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
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 GNU Make is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNU Make; see the file COPYING. If not, write to
17 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
43 extern int try_implicit_rule
PARAMS ((struct file
*file
, unsigned int depth
));
46 /* The test for circular dependencies is based on the 'updating' bit in
47 `struct file'. However, double colon targets have seperate `struct
48 file's; make sure we always use the base of the double colon chain. */
50 #define start_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
52 #define finish_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
54 #define is_updating(_f) (((_f)->double_colon ? (_f)->double_colon : (_f))\
58 /* Incremented when a command is started (under -n, when one would be). */
59 unsigned int commands_started
= 0;
61 /* Current value for pruning the scan of the goal chain (toggle 0/1). */
62 static unsigned int considered
;
64 static int update_file
PARAMS ((struct file
*file
, unsigned int depth
));
65 static int update_file_1
PARAMS ((struct file
*file
, unsigned int depth
));
66 static int check_dep
PARAMS ((struct file
*file
, unsigned int depth
, FILE_TIMESTAMP this_mtime
, int *must_make_ptr
));
67 static int touch_file
PARAMS ((struct file
*file
));
68 static void remake_file
PARAMS ((struct file
*file
));
69 static FILE_TIMESTAMP name_mtime
PARAMS ((char *name
));
70 static int library_search
PARAMS ((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.
75 If MAKEFILES is nonzero, these goals are makefiles, so -t, -q, and -n should
76 be disabled for them unless they were also command-line targets, and we
77 should only make one goal at a time and return as soon as one goal whose
78 `changed' member is nonzero is successfully made. */
81 update_goal_chain (goals
, makefiles
)
82 register struct dep
*goals
;
85 int t
= touch_flag
, q
= question_flag
, n
= just_print_flag
;
86 unsigned int j
= job_slots
;
89 #define MTIME(file) (makefiles ? file_mtime_no_search (file) \
92 /* Duplicate the chain so we can remove things from it. */
94 goals
= copy_dep_chain (goals
);
97 /* Clear the `changed' flag of each goal in the chain.
98 We will use the flag below to notice when any commands
99 have actually been run for a target. When no commands
100 have been run, we give an "up to date" diagnostic. */
103 for (g
= goals
; g
!= 0; g
= g
->next
)
107 /* All files start with the considered bit 0, so the global value is 1. */
110 /* Update all the goals until they are all finished. */
114 register struct dep
*g
, *lastgoal
;
116 /* Start jobs that are waiting for the load to go down. */
118 start_waiting_jobs ();
120 /* Wait for a child to die. */
122 reap_children (1, 0);
128 /* Iterate over all double-colon entries for this file. */
130 int stop
= 0, any_not_updated
= 0;
132 for (file
= g
->file
->double_colon
? g
->file
->double_colon
: g
->file
;
136 unsigned int ocommands_started
;
138 check_renamed (file
);
141 if (file
->cmd_target
)
148 touch_flag
= question_flag
= just_print_flag
= 0;
151 /* Save the old value of `commands_started' so we can compare
152 later. It will be incremented when any commands are
154 ocommands_started
= commands_started
;
156 x
= update_file (file
, makefiles
? 1 : 0);
157 check_renamed (file
);
159 /* Set the goal's `changed' flag if any commands were started
160 by calling update_file above. We check this flag below to
161 decide when to give an "up to date" diagnostic. */
162 g
->changed
+= 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
= (!keep_going_flag
&& !question_flag
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. */
197 || (!just_print_flag
&& !question_flag
))
199 if (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. */
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
;
271 /* If FILE is not up to date, execute the commands for it.
272 Return 0 if successful, 1 if unsuccessful;
273 but with some flag settings, just call `exit' if unsuccessful.
275 DEPTH is the depth in recursions of this function.
276 We increment it during the consideration of our dependencies,
277 then decrement it again after finding out whether this file
280 If there are multiple double-colon entries for FILE,
281 each is considered in turn. */
284 update_file (file
, depth
)
288 register int status
= 0;
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 DBF (DB_VERBOSE
, _("Pruning file `%s'.\n"));
300 return f
->command_state
== cs_finished
? f
->update_status
: 0;
303 /* This loop runs until we start commands for a double colon rule, or until
304 the chain is exhausted. */
305 for (; f
!= 0; f
= f
->prev
)
307 f
->considered
= considered
;
309 status
|= update_file_1 (f
, depth
);
312 if (status
!= 0 && !keep_going_flag
)
315 if (f
->command_state
== cs_running
316 || f
->command_state
== cs_deps_running
)
318 /* Don't run the other :: rules for this
319 file until this rule is finished. */
325 /* Process the remaining rules in the double colon chain so they're marked
326 considered. Start their prerequisites, too. */
327 for (; f
!= 0 ; f
= f
->prev
)
331 f
->considered
= considered
;
333 for (d
= f
->deps
; d
!= 0; d
= d
->next
)
334 status
|= update_file (d
->file
, depth
+ 1);
340 /* Consider a single `struct file' and update it as appropriate. */
343 update_file_1 (file
, depth
)
347 register FILE_TIMESTAMP this_mtime
;
348 int noexist
, must_make
, deps_changed
;
350 register struct dep
*d
, *lastd
;
353 DBF (DB_VERBOSE
, _("Considering target file `%s'.\n"));
357 if (file
->update_status
> 0)
360 _("Recently tried and failed to update file `%s'.\n"));
361 return file
->update_status
;
364 DBF (DB_VERBOSE
, _("File `%s' was considered already.\n"));
368 switch (file
->command_state
)
371 case cs_deps_running
:
374 DBF (DB_VERBOSE
, _("Still updating file `%s'.\n"));
377 DBF (DB_VERBOSE
, _("Finished updating file `%s'.\n"));
378 return file
->update_status
;
385 /* Notice recursive update of the same file. */
386 start_updating (file
);
388 /* Looking at the file's modtime beforehand allows the possibility
389 that its name may be changed by a VPATH search, and thus it may
390 not need an implicit rule. If this were not done, the file
391 might get implicit commands that apply to its initial name, only
392 to have that name replaced with another found by VPATH search. */
394 this_mtime
= file_mtime (file
);
395 check_renamed (file
);
396 noexist
= this_mtime
== NONEXISTENT_MTIME
;
398 DBF (DB_BASIC
, _("File `%s' does not exist.\n"));
399 else if (ORDINARY_MTIME_MIN
<= this_mtime
&& this_mtime
<= ORDINARY_MTIME_MAX
400 && file
->low_resolution_time
)
402 /* Avoid spurious rebuilds due to low resolution time stamps. */
403 int ns
= FILE_TIMESTAMP_NS (this_mtime
);
405 error (NILF
, _("*** Warning: .LOW_RESOLUTION_TIME file `%s' has a high resolution time stamp"),
407 this_mtime
+= FILE_TIMESTAMPS_PER_S
- 1 - ns
;
412 /* If file was specified as a target with no commands,
413 come up with some default commands. */
415 if (!file
->phony
&& file
->cmds
== 0 && !file
->tried_implicit
)
417 if (try_implicit_rule (file
, depth
))
418 DBF (DB_IMPLICIT
, _("Found an implicit rule for `%s'.\n"));
420 DBF (DB_IMPLICIT
, _("No implicit rule found for `%s'.\n"));
421 file
->tried_implicit
= 1;
423 if (file
->cmds
== 0 && !file
->is_target
424 && default_file
!= 0 && default_file
->cmds
!= 0)
426 DBF (DB_IMPLICIT
, _("Using default commands for `%s'.\n"));
427 file
->cmds
= default_file
->cmds
;
430 /* Update all non-intermediate files we depend on, if necessary,
431 and see whether any of them is more recent than this file. */
437 FILE_TIMESTAMP mtime
;
439 check_renamed (d
->file
);
441 mtime
= file_mtime (d
->file
);
442 check_renamed (d
->file
);
444 if (is_updating (d
->file
))
446 error (NILF
, _("Circular %s <- %s dependency dropped."),
447 file
->name
, d
->file
->name
);
448 /* We cannot free D here because our the caller will still have
449 a reference to it when we were called recursively via
452 file
->deps
= d
->next
;
454 lastd
->next
= d
->next
;
459 d
->file
->parent
= file
;
460 dep_status
|= check_dep (d
->file
, depth
, this_mtime
, &must_make
);
461 check_renamed (d
->file
);
464 register struct file
*f
= d
->file
;
469 running
|= (f
->command_state
== cs_running
470 || f
->command_state
== cs_deps_running
);
476 if (dep_status
!= 0 && !keep_going_flag
)
480 d
->changed
= file_mtime (d
->file
) != mtime
;
486 /* Now we know whether this target needs updating.
487 If it does, update all the intermediate files we depend on. */
491 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
492 if (d
->file
->intermediate
)
494 FILE_TIMESTAMP mtime
= file_mtime (d
->file
);
495 check_renamed (d
->file
);
496 d
->file
->parent
= file
;
497 dep_status
|= update_file (d
->file
, depth
);
498 check_renamed (d
->file
);
501 register struct file
*f
= d
->file
;
506 running
|= (f
->command_state
== cs_running
507 || f
->command_state
== cs_deps_running
);
513 if (dep_status
!= 0 && !keep_going_flag
)
517 d
->changed
= ((file
->phony
&& file
->cmds
!= 0)
518 || file_mtime (d
->file
) != mtime
);
522 finish_updating (file
);
524 DBF (DB_VERBOSE
, _("Finished prerequisites of target file `%s'.\n"));
528 set_command_state (file
, cs_deps_running
);
530 DBF (DB_VERBOSE
, _("The prerequisites of `%s' are being made.\n"));
534 /* If any dependency failed, give up now. */
538 file
->update_status
= dep_status
;
539 notice_finished_file (file
);
543 DBF (DB_VERBOSE
, _("Giving up on target file `%s'.\n"));
545 if (depth
== 0 && keep_going_flag
546 && !just_print_flag
&& !question_flag
)
548 _("Target `%s' not remade because of errors."), file
->name
);
553 if (file
->command_state
== cs_deps_running
)
554 /* The commands for some deps were running on the last iteration, but
555 they have finished now. Reset the command_state to not_started to
556 simplify later bookkeeping. It is important that we do this only
557 when the prior state was cs_deps_running, because that prior state
558 was definitely propagated to FILE's also_make's by set_command_state
559 (called above), but in another state an also_make may have
560 independently changed to finished state, and we would confuse that
561 file's bookkeeping (updated, but not_started is bogus state). */
562 set_command_state (file
, cs_not_started
);
564 /* Now record which dependencies are more
565 recent than this file, so we can define $?. */
568 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
570 FILE_TIMESTAMP d_mtime
= file_mtime (d
->file
);
571 check_renamed (d
->file
);
573 #if 1 /* %%% In version 4, remove this code completely to
574 implement not remaking deps if their deps are newer
575 than their parents. */
576 if (d_mtime
== NONEXISTENT_MTIME
&& !d
->file
->intermediate
)
577 /* We must remake if this dep does not
578 exist and is not intermediate. */
582 /* Set DEPS_CHANGED if this dep actually changed. */
583 deps_changed
|= d
->changed
;
585 /* Set D->changed if either this dep actually changed,
586 or its dependent, FILE, is older or does not exist. */
587 d
->changed
|= noexist
|| d_mtime
> this_mtime
;
589 if (!noexist
&& ISDB (DB_BASIC
|DB_VERBOSE
))
593 if (d_mtime
== NONEXISTENT_MTIME
)
596 fmt
= _("Prerequisite `%s' of target `%s' does not exist.\n");
601 fmt
= _("Prerequisite `%s' is newer than target `%s'.\n");
603 else if (ISDB (DB_VERBOSE
))
604 fmt
= _("Prerequisite `%s' is older than target `%s'.\n");
608 print_spaces (depth
);
609 printf (fmt
, dep_name (d
), file
->name
);
615 /* Here depth returns to the value it had when we were called. */
618 if (file
->double_colon
&& file
->deps
== 0)
622 _("Target `%s' is double-colon and has no prerequisites.\n"));
624 else if (!noexist
&& file
->is_target
&& !deps_changed
&& file
->cmds
== 0)
628 _("No commands for `%s' and no prerequisites actually changed.\n"));
633 if (ISDB (DB_VERBOSE
))
635 print_spaces (depth
);
636 printf (_("No need to remake target `%s'"), file
->name
);
637 if (!streq (file
->name
, file
->hname
))
638 printf (_("; using VPATH name `%s'"), file
->hname
);
643 notice_finished_file (file
);
645 /* Since we don't need to remake the file, convert it to use the
646 VPATH filename if we found one. hfile will be either the
647 local name if no VPATH or the VPATH name if one was found. */
651 file
->name
= file
->hname
;
658 DBF (DB_BASIC
, _("Must remake target `%s'.\n"));
660 /* It needs to be remade. If it's VPATH and not reset via GPATH, toss the
662 if (!streq(file
->name
, file
->hname
))
664 DB (DB_BASIC
, (_(" Ignoring VPATH name `%s'.\n"), file
->hname
));
665 file
->ignore_vpath
= 1;
668 /* Now, take appropriate actions to remake the file. */
671 if (file
->command_state
!= cs_finished
)
673 DBF (DB_VERBOSE
, _("Commands of `%s' are being run.\n"));
677 switch (file
->update_status
)
680 DBF (DB_BASIC
, _("Failed to remake target file `%s'.\n"));
683 DBF (DB_BASIC
, _("Successfully remade target file `%s'.\n"));
686 DBF (DB_BASIC
, _("Target file `%s' needs remade under -q.\n"));
689 assert (file
->update_status
>= 0 && file
->update_status
<= 2);
694 return file
->update_status
;
697 /* Set FILE's `updated' flag and re-check its mtime and the mtime's of all
698 files listed in its `also_make' member. Under -t, this function also
701 On return, FILE->update_status will no longer be -1 if it was. */
704 notice_finished_file (file
)
705 register struct file
*file
;
708 int ran
= file
->command_state
== cs_running
;
710 file
->command_state
= cs_finished
;
714 /* The update status will be:
715 -1 if this target was not remade;
716 0 if 0 or more commands (+ or ${MAKE}) were run and won;
717 1 if some commands were run and lost.
718 We touch the target if it has commands which either were not run
719 or won when they ran (i.e. status is 0). */
720 && file
->update_status
== 0)
722 if (file
->cmds
!= 0 && file
->cmds
->any_recurse
)
724 /* If all the command lines were recursive,
725 we don't want to do the touching. */
727 for (i
= 0; i
< file
->cmds
->ncommand_lines
; ++i
)
728 if (!(file
->cmds
->lines_flags
[i
] & COMMANDS_RECURSE
))
729 goto have_nonrecursing
;
735 file
->update_status
= 0;
737 /* Should set file's modification date and do nothing else. */
738 file
->update_status
= touch_file (file
);
742 if (file
->mtime_before_update
== UNKNOWN_MTIME
)
743 file
->mtime_before_update
= file
->last_mtime
;
745 if (ran
&& !file
->phony
)
750 /* If -n or -q and all the commands are recursive, we ran them so
751 really check the target's mtime again. Otherwise, assume the target
752 would have been updated. */
754 if (question_flag
|| just_print_flag
)
756 for (i
= file
->cmds
->ncommand_lines
; i
> 0; --i
)
757 if (! (file
->cmds
->lines_flags
[i
-1] & COMMANDS_RECURSE
))
761 /* If there were no commands at all, it's always new. */
763 else if (file
->is_target
&& file
->cmds
== 0)
766 file
->last_mtime
= i
== 0 ? UNKNOWN_MTIME
: NEW_MTIME
;
768 /* Propagate the change of modification time to all the double-colon
769 entries for this file. */
770 for (f
= file
->double_colon
; f
!= 0; f
= f
->prev
)
771 f
->last_mtime
= file
->last_mtime
;
774 if (ran
&& file
->update_status
!= -1)
775 /* We actually tried to update FILE, which has
776 updated its also_make's as well (if it worked).
777 If it didn't work, it wouldn't work again for them.
778 So mark them as updated with the same status. */
779 for (d
= file
->also_make
; d
!= 0; d
= d
->next
)
781 d
->file
->command_state
= cs_finished
;
782 d
->file
->updated
= 1;
783 d
->file
->update_status
= file
->update_status
;
785 if (ran
&& !d
->file
->phony
)
786 /* Fetch the new modification time.
787 We do this instead of just invalidating the cached time
788 so that a vpath_search can happen. Otherwise, it would
789 never be done because the target is already updated. */
790 (void) f_mtime (d
->file
, 0);
792 else if (file
->update_status
== -1)
793 /* Nothing was done for FILE, but it needed nothing done.
794 So mark it now as "succeeded". */
795 file
->update_status
= 0;
798 /* Check whether another file (whose mtime is THIS_MTIME)
799 needs updating on account of a dependency which is file FILE.
800 If it does, store 1 in *MUST_MAKE_PTR.
801 In the process, update any non-intermediate files
802 that FILE depends on (including FILE itself).
803 Return nonzero if any updating failed. */
806 check_dep (file
, depth
, this_mtime
, must_make_ptr
)
809 FILE_TIMESTAMP this_mtime
;
812 register struct dep
*d
;
816 start_updating (file
);
818 if (!file
->intermediate
)
819 /* If this is a non-intermediate file, update it and record
820 whether it is newer than THIS_MTIME. */
822 FILE_TIMESTAMP mtime
;
823 dep_status
= update_file (file
, depth
);
824 check_renamed (file
);
825 mtime
= file_mtime (file
);
826 check_renamed (file
);
827 if (mtime
== NONEXISTENT_MTIME
|| mtime
> this_mtime
)
832 /* FILE is an intermediate file. */
833 FILE_TIMESTAMP mtime
;
835 if (!file
->phony
&& file
->cmds
== 0 && !file
->tried_implicit
)
837 if (try_implicit_rule (file
, depth
))
838 DBF (DB_IMPLICIT
, _("Found an implicit rule for `%s'.\n"));
840 DBF (DB_IMPLICIT
, _("No implicit rule found for `%s'.\n"));
841 file
->tried_implicit
= 1;
843 if (file
->cmds
== 0 && !file
->is_target
844 && default_file
!= 0 && default_file
->cmds
!= 0)
846 DBF (DB_IMPLICIT
, _("Using default commands for `%s'.\n"));
847 file
->cmds
= default_file
->cmds
;
850 /* If the intermediate file actually exists
851 and is newer, then we should remake from it. */
852 check_renamed (file
);
853 mtime
= file_mtime (file
);
854 check_renamed (file
);
855 if (mtime
!= NONEXISTENT_MTIME
&& mtime
> this_mtime
)
857 /* Otherwise, update all non-intermediate files we depend on,
858 if necessary, and see whether any of them is more
859 recent than the file on whose behalf we are checking. */
862 register struct dep
*lastd
;
868 if (is_updating (d
->file
))
870 error (NILF
, _("Circular %s <- %s dependency dropped."),
871 file
->name
, d
->file
->name
);
874 file
->deps
= d
->next
;
880 lastd
->next
= d
->next
;
887 d
->file
->parent
= file
;
888 dep_status
|= check_dep (d
->file
, depth
, this_mtime
,
890 check_renamed (d
->file
);
891 if (dep_status
!= 0 && !keep_going_flag
)
894 if (d
->file
->command_state
== cs_running
895 || d
->file
->command_state
== cs_deps_running
)
896 /* Record that some of FILE's deps are still being made.
897 This tells the upper levels to wait on processing it until
898 the commands are finished. */
899 set_command_state (file
, cs_deps_running
);
907 finish_updating (file
);
911 /* Touch FILE. Return zero if successful, one if not. */
913 #define TOUCH_ERROR(call) return (perror_with_name (call, file->name), 1)
917 register struct file
*file
;
920 message (0, "touch %s", file
->name
);
923 if (ar_name (file
->name
))
924 return ar_touch (file
->name
);
928 int fd
= open (file
->name
, O_RDWR
| O_CREAT
, 0666);
931 TOUCH_ERROR ("touch: open: ");
937 if (fstat (fd
, &statbuf
) < 0)
938 TOUCH_ERROR ("touch: fstat: ");
939 /* Rewrite character 0 same as it already is. */
940 if (read (fd
, &buf
, 1) < 0)
941 TOUCH_ERROR ("touch: read: ");
942 if (lseek (fd
, 0L, 0) < 0L)
943 TOUCH_ERROR ("touch: lseek: ");
944 if (write (fd
, &buf
, 1) < 0)
945 TOUCH_ERROR ("touch: write: ");
946 /* If file length was 0, we just
947 changed it, so change it back. */
948 if (statbuf
.st_size
== 0)
951 fd
= open (file
->name
, O_RDWR
| O_TRUNC
, 0666);
953 TOUCH_ERROR ("touch: open: ");
962 /* Having checked and updated the dependencies of FILE,
963 do whatever is appropriate to remake FILE itself.
964 Return the status from executing FILE's commands. */
973 /* Phony target. Pretend it succeeded. */
974 file
->update_status
= 0;
975 else if (file
->is_target
)
976 /* This is a nonexistent target file we cannot make.
977 Pretend it was successfully remade. */
978 file
->update_status
= 0;
981 const char *msg_noparent
982 = _("%sNo rule to make target `%s'%s");
983 const char *msg_parent
984 = _("%sNo rule to make target `%s', needed by `%s'%s");
986 /* This is a dependency file we cannot remake. Fail. */
987 if (!keep_going_flag
&& !file
->dontcare
)
989 if (file
->parent
== 0)
990 fatal (NILF
, msg_noparent
, "", file
->name
, "");
992 fatal (NILF
, msg_parent
, "", file
->name
, file
->parent
->name
, "");
997 if (file
->parent
== 0)
998 error (NILF
, msg_noparent
, "*** ", file
->name
, ".");
1000 error (NILF
, msg_parent
, "*** ",
1001 file
->name
, file
->parent
->name
, ".");
1003 file
->update_status
= 2;
1008 chop_commands (file
->cmds
);
1010 /* The normal case: start some commands. */
1011 if (!touch_flag
|| file
->cmds
->any_recurse
)
1013 execute_file_commands (file
);
1017 /* This tells notice_finished_file it is ok to touch the file. */
1018 file
->update_status
= 0;
1021 /* This does the touching under -t. */
1022 notice_finished_file (file
);
1025 /* Return the mtime of a file, given a `struct file'.
1026 Caches the time in the struct file to avoid excess stat calls.
1028 If the file is not found, and SEARCH is nonzero, VPATH searching and
1029 replacement is done. If that fails, a library (-lLIBNAME) is tried and
1030 the library's actual name (/lib/libLIBNAME.a, etc.) is substituted into
1034 f_mtime (file
, search
)
1035 register struct file
*file
;
1038 FILE_TIMESTAMP mtime
;
1040 /* File's mtime is not known; must get it from the system. */
1043 if (ar_name (file
->name
))
1045 /* This file is an archive-member reference. */
1047 char *arname
, *memname
;
1048 struct file
*arfile
;
1049 int arname_used
= 0;
1052 /* Find the archive's name. */
1053 ar_parse_name (file
->name
, &arname
, &memname
);
1055 /* Find the modification time of the archive itself.
1056 Also allow for its name to be changed via VPATH search. */
1057 arfile
= lookup_file (arname
);
1060 arfile
= enter_file (arname
);
1063 mtime
= f_mtime (arfile
, search
);
1064 check_renamed (arfile
);
1065 if (search
&& strcmp (arfile
->hname
, arname
))
1067 /* The archive's name has changed.
1068 Change the archive-member reference accordingly. */
1071 unsigned int arlen
, memlen
;
1079 arname
= arfile
->hname
;
1080 arlen
= strlen (arname
);
1081 memlen
= strlen (memname
);
1083 /* free (file->name); */
1085 name
= (char *) xmalloc (arlen
+ 1 + memlen
+ 2);
1086 bcopy (arname
, name
, arlen
);
1088 bcopy (memname
, name
+ arlen
+ 1, memlen
);
1089 name
[arlen
+ 1 + memlen
] = ')';
1090 name
[arlen
+ 1 + memlen
+ 1] = '\0';
1092 /* If the archive was found with GPATH, make the change permanent;
1093 otherwise defer it until later. */
1094 if (arfile
->name
== arfile
->hname
)
1095 rename_file (file
, name
);
1097 rehash_file (file
, name
);
1098 check_renamed (file
);
1105 file
->low_resolution_time
= 1;
1107 if (mtime
== NONEXISTENT_MTIME
)
1108 /* The archive doesn't exist, so its members don't exist either. */
1109 return NONEXISTENT_MTIME
;
1111 member_date
= ar_member_date (file
->hname
);
1112 mtime
= (member_date
== (time_t) -1
1114 : file_timestamp_cons (file
->hname
, member_date
, 0));
1119 mtime
= name_mtime (file
->name
);
1121 if (mtime
== NONEXISTENT_MTIME
&& search
&& !file
->ignore_vpath
)
1123 /* If name_mtime failed, search VPATH. */
1124 char *name
= file
->name
;
1125 if (vpath_search (&name
, &mtime
)
1126 /* Last resort, is it a library (-lxxx)? */
1127 || (name
[0] == '-' && name
[1] == 'l'
1128 && library_search (&name
, &mtime
)))
1130 if (mtime
!= UNKNOWN_MTIME
)
1131 /* vpath_search and library_search store UNKNOWN_MTIME
1132 if they didn't need to do a stat call for their work. */
1133 file
->last_mtime
= mtime
;
1135 /* If we found it in VPATH, see if it's in GPATH too; if so,
1136 change the name right now; if not, defer until after the
1137 dependencies are updated. */
1138 if (gpath_search (name
, strlen(name
) - strlen(file
->name
) - 1))
1140 rename_file (file
, name
);
1141 check_renamed (file
);
1142 return file_mtime (file
);
1145 rehash_file (file
, name
);
1146 check_renamed (file
);
1147 mtime
= name_mtime (name
);
1153 /* Files can have bogus timestamps that nothing newly made will be
1154 "newer" than. Updating their dependents could just result in loops.
1155 So notify the user of the anomaly with a warning.
1157 We only need to do this once, for now. */
1159 if (!clock_skew_detected
1160 && mtime
!= NONEXISTENT_MTIME
1163 static FILE_TIMESTAMP adjusted_now
;
1165 FILE_TIMESTAMP adjusted_mtime
= mtime
;
1167 #if defined(WINDOWS32) || defined(__MSDOS__)
1168 /* Experimentation has shown that FAT filesystems can set file times
1169 up to 3 seconds into the future! Play it safe. */
1171 #define FAT_ADJ_OFFSET (FILE_TIMESTAMP) 3
1173 FILE_TIMESTAMP adjustment
= FAT_ADJ_OFFSET
<< FILE_TIMESTAMP_LO_BITS
;
1174 if (ORDINARY_MTIME_MIN
+ adjustment
<= adjusted_mtime
)
1175 adjusted_mtime
-= adjustment
;
1178 /* If the file's time appears to be in the future, update our
1179 concept of the present and try once more. */
1180 if (adjusted_now
< adjusted_mtime
)
1183 FILE_TIMESTAMP now
= file_timestamp_now (&resolution
);
1184 adjusted_now
= now
+ (resolution
- 1);
1185 if (adjusted_now
< adjusted_mtime
)
1188 error (NILF
, _("Warning: File `%s' has modification time in the future"),
1192 (FILE_TIMESTAMP_S (mtime
) - FILE_TIMESTAMP_S (now
)
1193 + ((FILE_TIMESTAMP_NS (mtime
) - FILE_TIMESTAMP_NS (now
))
1195 error (NILF
, _("Warning: File `%s' has modification time %.2g s in the future"),
1196 file
->name
, from_now
);
1198 clock_skew_detected
= 1;
1204 /* Store the mtime into all the entries for this file. */
1205 if (file
->double_colon
)
1206 file
= file
->double_colon
;
1210 /* If this file is not implicit but it is intermediate then it was
1211 made so by the .INTERMEDIATE target. If this file has never
1212 been built by us but was found now, it existed before make
1213 started. So, turn off the intermediate bit so make doesn't
1214 delete it, since it didn't create it. */
1215 if (mtime
!= NONEXISTENT_MTIME
&& file
->command_state
== cs_not_started
1216 && file
->command_state
== cs_not_started
1217 && !file
->tried_implicit
&& file
->intermediate
)
1218 file
->intermediate
= 0;
1220 file
->last_mtime
= mtime
;
1229 /* Return the mtime of the file or archive-member reference NAME. */
1231 static FILE_TIMESTAMP
1233 register char *name
;
1237 if (stat (name
, &st
) != 0)
1239 if (errno
!= ENOENT
&& errno
!= ENOTDIR
)
1240 perror_with_name ("stat:", name
);
1241 return NONEXISTENT_MTIME
;
1244 return FILE_TIMESTAMP_STAT_MODTIME (name
, st
);
1248 /* Search for a library file specified as -lLIBNAME, searching for a
1249 suitable library file in the system library directories and the VPATH
1253 library_search (lib
, mtime_ptr
)
1255 FILE_TIMESTAMP
*mtime_ptr
;
1257 static char *dirs
[] =
1263 #if defined(WINDOWS32) && !defined(LIBDIR)
1265 * This is completely up to the user at product install time. Just define
1270 LIBDIR
, /* Defined by configuration. */
1274 static char *libpatterns
= NULL
;
1276 char *libname
= &(*lib
)[2]; /* Name without the `-l'. */
1277 FILE_TIMESTAMP mtime
;
1279 /* Loop variables for the libpatterns value. */
1285 /* If we don't have libpatterns, get it. */
1288 int save
= warn_undefined_variables_flag
;
1289 warn_undefined_variables_flag
= 0;
1291 libpatterns
= xstrdup (variable_expand ("$(strip $(.LIBPATTERNS))"));
1293 warn_undefined_variables_flag
= save
;
1296 /* Loop through all the patterns in .LIBPATTERNS, and search on each one. */
1298 while ((p
= find_next_token (&p2
, &len
)) != 0)
1300 static char *buf
= NULL
;
1301 static int buflen
= 0;
1302 static int libdir_maxlen
= -1;
1303 char *libbuf
= variable_expand ("");
1305 /* Expand the pattern using LIBNAME as a replacement. */
1311 p3
= find_percent (p
);
1314 /* Give a warning if there is no pattern, then remove the
1315 pattern so it's ignored next time. */
1316 error (NILF
, _(".LIBPATTERNS element `%s' is not a pattern"), p
);
1317 for (; len
; --len
, ++p
)
1322 p4
= variable_buffer_output (libbuf
, p
, p3
-p
);
1323 p4
= variable_buffer_output (p4
, libname
, strlen (libname
));
1324 p4
= variable_buffer_output (p4
, p3
+1, len
- (p3
-p
));
1328 /* Look first for `libNAME.a' in the current directory. */
1329 mtime
= name_mtime (libbuf
);
1330 if (mtime
!= NONEXISTENT_MTIME
)
1332 *lib
= xstrdup (libbuf
);
1338 /* Now try VPATH search on that. */
1341 if (vpath_search (&file
, mtime_ptr
))
1347 /* Now try the standard set of directories. */
1351 for (dp
= dirs
; *dp
!= 0; ++dp
)
1353 int l
= strlen (*dp
);
1354 if (l
> libdir_maxlen
)
1357 buflen
= strlen (libbuf
);
1358 buf
= xmalloc(libdir_maxlen
+ buflen
+ 2);
1360 else if (buflen
< strlen (libbuf
))
1362 buflen
= strlen (libbuf
);
1363 buf
= xrealloc (buf
, libdir_maxlen
+ buflen
+ 2);
1366 for (dp
= dirs
; *dp
!= 0; ++dp
)
1368 sprintf (buf
, "%s/%s", *dp
, libbuf
);
1369 mtime
= name_mtime (buf
);
1370 if (mtime
!= NONEXISTENT_MTIME
)
1372 *lib
= xstrdup (buf
);