1 /* Command processing for GNU Make.
2 Copyright (C) 1988, 89, 91, 92, 93, 94, 95, 96 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
26 extern int remote_kill
PARAMS ((int id
, int sig
));
32 /* Set FILE's automatic variables up. */
35 set_file_variables (file
)
36 register struct file
*file
;
39 char *at
, *percent
, *star
, *less
;
42 /* If the target is an archive member `lib(member)',
43 then $@ is `lib' and $% is `member'. */
45 if (ar_name (file
->name
))
48 p
= index (file
->name
, '(');
49 at
= (char *) alloca (p
- file
->name
+ 1);
50 bcopy (file
->name
, at
, p
- file
->name
);
51 at
[p
- file
->name
] = '\0';
53 percent
= (char *) alloca (len
);
54 bcopy (p
+ 1, percent
, len
- 1);
55 percent
[len
- 1] = '\0';
58 #endif /* NO_ARCHIVES. */
64 /* $* is the stem from an implicit or static pattern rule. */
67 /* In Unix make, $* is set to the target name with
68 any suffix in the .SUFFIXES list stripped off for
69 explicit rules. We store this in the `stem' member. */
70 register struct dep
*d
;
75 if (ar_name (file
->name
))
77 name
= index (file
->name
, '(') + 1;
78 len
= strlen (name
) - 1;
87 for (d
= enter_file (".SUFFIXES")->deps
; d
!= 0; d
= d
->next
)
89 unsigned int slen
= strlen (dep_name (d
));
90 if (len
> slen
&& !strncmp (dep_name (d
), name
+ (len
- slen
), slen
))
92 file
->stem
= savestring (name
, len
- slen
);
101 /* $< is the first dependency. */
102 less
= file
->deps
!= 0 ? dep_name (file
->deps
) : "";
104 if (file
->cmds
== default_file
->cmds
)
105 /* This file got its commands from .DEFAULT.
106 In this case $< is the same as $@. */
109 #define DEFINE_VARIABLE(name, len, value) \
110 (void) define_variable_for_file (name, len, value, o_automatic, 0, file)
112 /* Define the variables. */
114 DEFINE_VARIABLE ("<", 1, less
);
115 DEFINE_VARIABLE ("*", 1, star
);
116 DEFINE_VARIABLE ("@", 1, at
);
117 DEFINE_VARIABLE ("%", 1, percent
);
119 /* Compute the values for $^, $+, and $?. */
122 register unsigned int qmark_len
, plus_len
;
123 char *caret_value
, *plus_value
;
127 register struct dep
*d
;
130 /* Compute first the value for $+, which is supposed to contain
131 duplicate dependencies as they were listed in the makefile. */
134 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
135 plus_len
+= strlen (dep_name (d
)) + 1;
137 len
= plus_len
== 0 ? 1 : plus_len
;
138 cp
= plus_value
= (char *) alloca (len
);
140 qmark_len
= plus_len
; /* Will be this or less. */
141 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
143 char *c
= dep_name (d
);
148 c
= index (c
, '(') + 1;
149 len
= strlen (c
) - 1;
163 qmark_len
-= len
+ 1; /* Don't space in $? for this one. */
166 /* Kill the last space and define the variable. */
168 cp
[cp
> plus_value
? -1 : 0] = '\0';
169 DEFINE_VARIABLE ("+", 1, plus_value
);
171 /* Make sure that no dependencies are repeated. This does not
172 really matter for the purpose of updating targets, but it
173 might make some names be listed twice for $^ and $?. */
175 uniquize_deps (file
->deps
);
177 /* Compute the values for $^ and $?. */
179 cp
= caret_value
= plus_value
; /* Reuse the buffer; it's big enough. */
180 len
= qmark_len
== 0 ? 1 : qmark_len
;
181 qp
= qmark_value
= (char *) alloca (len
);
183 for (d
= file
->deps
; d
!= 0; d
= d
->next
)
185 char *c
= dep_name (d
);
190 c
= index (c
, '(') + 1;
191 len
= strlen (c
) - 1;
216 /* Kill the last spaces and define the variables. */
218 cp
[cp
> caret_value
? -1 : 0] = '\0';
219 DEFINE_VARIABLE ("^", 1, caret_value
);
221 qp
[qp
> qmark_value
? -1 : 0] = '\0';
222 DEFINE_VARIABLE ("?", 1, qmark_value
);
225 #undef DEFINE_VARIABLE
228 /* Chop CMDS up into individual command lines if necessary.
229 Also set the `lines_flag' and `any_recurse' members. */
233 register struct commands
*cmds
;
235 if (cmds
!= 0 && cmds
->command_lines
== 0)
237 /* Chop CMDS->commands up into lines in CMDS->command_lines.
238 Also set the corresponding CMDS->lines_flags elements,
239 and the CMDS->any_recurse flag. */
241 unsigned int nlines
, idx
;
245 lines
= (char **) xmalloc (5 * sizeof (char *));
252 end
= index (end
, '\n');
254 end
= p
+ strlen (p
);
255 else if (end
> p
&& end
[-1] == '\\')
259 for (b
= end
- 2; b
>= p
&& *b
== '\\'; --b
)
260 backslash
= !backslash
;
271 lines
= (char **) xrealloc ((char *) lines
,
272 nlines
* sizeof (char *));
274 lines
[idx
++] = savestring (p
, end
- p
);
283 lines
= (char **) xrealloc ((char *) lines
,
284 nlines
* sizeof (char *));
287 cmds
->ncommand_lines
= nlines
;
288 cmds
->command_lines
= lines
;
290 cmds
->any_recurse
= 0;
291 cmds
->lines_flags
= (char *) xmalloc (nlines
);
292 for (idx
= 0; idx
< nlines
; ++idx
)
297 isblank (*p
) || *p
== '-' || *p
== '@' || *p
== '+';
302 flags
|= COMMANDS_RECURSE
;
305 flags
|= COMMANDS_SILENT
;
308 flags
|= COMMANDS_NOERROR
;
311 if (!(flags
& COMMANDS_RECURSE
))
313 unsigned int len
= strlen (p
);
314 if (sindex (p
, len
, "$(MAKE)", 7) != 0
315 || sindex (p
, len
, "${MAKE}", 7) != 0)
316 flags
|= COMMANDS_RECURSE
;
319 cmds
->lines_flags
[idx
] = flags
;
320 cmds
->any_recurse
|= flags
& COMMANDS_RECURSE
;
325 /* Execute the commands to remake FILE. If they are currently executing,
326 return or have already finished executing, just return. Otherwise,
327 fork off a child process to run the first command line in the sequence. */
330 execute_file_commands (file
)
335 /* Don't go through all the preparations if
336 the commands are nothing but whitespace. */
338 for (p
= file
->cmds
->commands
; *p
!= '\0'; ++p
)
339 if (!isspace (*p
) && *p
!= '-' && *p
!= '@')
343 /* We are all out of commands.
344 If we have gotten this far, all the previous commands
345 have run successfully, so we have winning update status. */
346 file
->update_status
= 0;
347 notice_finished_file (file
);
351 /* First set the automatic variables according to this file. */
353 initialize_file_variables (file
);
355 set_file_variables (file
);
357 /* Start the commands running. */
361 /* This is set while we are inside fatal_error_signal,
362 so things can avoid nonreentrant operations. */
364 int handling_fatal_signal
= 0;
366 /* Handle fatal signals. */
369 fatal_error_signal (sig
)
372 #if defined(__MSDOS__) || defined(_AMIGA)
373 remove_intermediates (1);
376 fputs ("*** Break.\n", stderr
);
382 #else /* Not MSDOS. */
383 handling_fatal_signal
= 1;
385 /* Set the handling for this signal to the default.
386 It is blocked now while we run this handler. */
387 signal (sig
, SIG_DFL
);
389 /* A termination signal won't be sent to the entire
390 process group, but it means we want to kill the children. */
394 register struct child
*c
;
395 for (c
= children
; c
!= 0; c
= c
->next
)
397 (void) kill (c
->pid
, SIGTERM
);
400 /* If we got a signal that means the user
401 wanted to kill make, remove pending targets. */
403 if (sig
== SIGTERM
|| sig
== SIGINT
412 register struct child
*c
;
414 /* Remote children won't automatically get signals sent
415 to the process group, so we must send them. */
416 for (c
= children
; c
!= 0; c
= c
->next
)
418 (void) remote_kill (c
->pid
, sig
);
420 for (c
= children
; c
!= 0; c
= c
->next
)
421 delete_child_targets (c
);
423 /* Clean up the children. We don't just use the call below because
424 we don't want to print the "Waiting for children" message. */
425 while (job_slots_used
> 0)
426 reap_children (1, 0);
429 /* Wait for our children to die. */
430 while (job_slots_used
> 0)
431 reap_children (1, 1);
433 /* Delete any non-precious intermediate files that were made. */
435 remove_intermediates (1);
439 /* We don't want to send ourselves SIGQUIT, because it will
440 cause a core dump. Just exit instead. */
444 /* Signal the same code; this time it will really be fatal. The signal
445 will be unblocked when we return and arrive then to kill us. */
446 if (kill (getpid (), sig
) < 0)
447 pfatal_with_name ("kill");
451 /* Delete FILE unless it's precious or not actually a file (phony),
452 and it has changed on disk since we last stat'd it. */
455 delete_target (file
, on_behalf_of
)
461 if (file
->precious
|| file
->phony
)
465 if (ar_name (file
->name
))
467 if (ar_member_date (file
->name
) != file
->last_mtime
)
470 error ("*** [%s] Archive member `%s' may be bogus; not deleted",
471 on_behalf_of
, file
->name
);
473 error ("*** Archive member `%s' may be bogus; not deleted",
480 if (stat (file
->name
, &st
) == 0
481 && S_ISREG (st
.st_mode
)
482 && (time_t) st
.st_mtime
!= file
->last_mtime
)
485 error ("*** [%s] Deleting file `%s'", on_behalf_of
, file
->name
);
487 error ("*** Deleting file `%s'", file
->name
);
488 if (unlink (file
->name
) < 0
489 && errno
!= ENOENT
) /* It disappeared; so what. */
490 perror_with_name ("unlink: ", file
->name
);
495 /* Delete all non-precious targets of CHILD unless they were already deleted.
496 Set the flag in CHILD to say they've been deleted. */
499 delete_child_targets (child
)
507 /* Delete the target file if it changed. */
508 delete_target (child
->file
, (char *) 0);
510 /* Also remove any non-precious targets listed in the `also_make' member. */
511 for (d
= child
->file
->also_make
; d
!= 0; d
= d
->next
)
512 delete_target (d
->file
, child
->file
->name
);
517 /* Print out the commands in CMDS. */
520 print_commands (cmds
)
521 register struct commands
*cmds
;
525 fputs ("# commands to execute", stdout
);
527 if (cmds
->filename
== 0)
528 puts (" (built-in):");
530 printf (" (from `%s', line %u):\n", cmds
->filename
, cmds
->lineno
);
540 end
= index (s
, '\n');
542 end
= s
+ strlen (s
);
544 printf ("\t%.*s\n", (int) (end
- s
), s
);