Fixups for warnings on Windows (esp 64bit).
[make.git] / commands.c
blob6c941f26412696e35626c75a7df5c00f3e4fb28e
1 /* Command processing 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, 2008, 2009 Free
4 Software Foundation, Inc.
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
10 version.
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/>. */
19 #include "make.h"
20 #include "dep.h"
21 #include "filedef.h"
22 #include "variable.h"
23 #include "job.h"
24 #include "commands.h"
25 #ifdef WINDOWS32
26 #include <windows.h>
27 #include "w32err.h"
28 #endif
30 #if VMS
31 # define FILE_LIST_SEPARATOR ','
32 #else
33 # define FILE_LIST_SEPARATOR ' '
34 #endif
36 int remote_kill (int id, int sig);
38 #ifndef HAVE_UNISTD_H
39 int getpid ();
40 #endif
43 static unsigned long
44 dep_hash_1 (const void *key)
46 const struct dep *d = key;
47 return_STRING_HASH_1 (dep_name (d));
50 static unsigned long
51 dep_hash_2 (const void *key)
53 const struct dep *d = key;
54 return_STRING_HASH_2 (dep_name (d));
57 static int
58 dep_hash_cmp (const void *x, const void *y)
60 const struct dep *dx = x;
61 const struct dep *dy = y;
62 return strcmp (dep_name (dx), dep_name (dy));
65 /* Set FILE's automatic variables up. */
67 void
68 set_file_variables (struct file *file)
70 struct dep *d;
71 const char *at, *percent, *star, *less;
73 #ifndef NO_ARCHIVES
74 /* If the target is an archive member `lib(member)',
75 then $@ is `lib' and $% is `member'. */
77 if (ar_name (file->name))
79 unsigned int len;
80 const char *cp;
81 char *p;
83 cp = strchr (file->name, '(');
84 p = alloca (cp - file->name + 1);
85 memcpy (p, file->name, cp - file->name);
86 p[cp - file->name] = '\0';
87 at = p;
88 len = strlen (cp + 1);
89 p = alloca (len);
90 memcpy (p, cp + 1, len - 1);
91 p[len - 1] = '\0';
92 percent = p;
94 else
95 #endif /* NO_ARCHIVES. */
97 at = file->name;
98 percent = "";
101 /* $* is the stem from an implicit or static pattern rule. */
102 if (file->stem == 0)
104 /* In Unix make, $* is set to the target name with
105 any suffix in the .SUFFIXES list stripped off for
106 explicit rules. We store this in the `stem' member. */
107 const char *name;
108 unsigned int len;
110 #ifndef NO_ARCHIVES
111 if (ar_name (file->name))
113 name = strchr (file->name, '(') + 1;
114 len = strlen (name) - 1;
116 else
117 #endif
119 name = file->name;
120 len = strlen (name);
123 for (d = enter_file (strcache_add (".SUFFIXES"))->deps; d ; d = d->next)
125 unsigned int slen = strlen (dep_name (d));
126 if (len > slen && strneq (dep_name (d), name + (len - slen), slen))
128 file->stem = strcache_add_len (name, len - slen);
129 break;
132 if (d == 0)
133 file->stem = "";
135 star = file->stem;
137 /* $< is the first not order-only dependency. */
138 less = "";
139 for (d = file->deps; d != 0; d = d->next)
140 if (!d->ignore_mtime)
142 if (!d->need_2nd_expansion)
143 less = dep_name (d);
144 break;
147 if (file->cmds == default_file->cmds)
148 /* This file got its commands from .DEFAULT.
149 In this case $< is the same as $@. */
150 less = at;
152 #define DEFINE_VARIABLE(name, len, value) \
153 (void) define_variable_for_file (name,len,value,o_automatic,0,file)
155 /* Define the variables. */
157 DEFINE_VARIABLE ("<", 1, less);
158 DEFINE_VARIABLE ("*", 1, star);
159 DEFINE_VARIABLE ("@", 1, at);
160 DEFINE_VARIABLE ("%", 1, percent);
162 /* Compute the values for $^, $+, $?, and $|. */
165 static char *plus_value=0, *bar_value=0, *qmark_value=0;
166 static unsigned int plus_max=0, bar_max=0, qmark_max=0;
168 unsigned int qmark_len, plus_len, bar_len;
169 char *cp;
170 char *caret_value;
171 char *qp;
172 char *bp;
173 unsigned int len;
175 struct hash_table dep_hash;
176 void **slot;
178 /* Compute first the value for $+, which is supposed to contain
179 duplicate dependencies as they were listed in the makefile. */
181 plus_len = 0;
182 bar_len = 0;
183 for (d = file->deps; d != 0; d = d->next)
185 if (!d->need_2nd_expansion)
187 if (d->ignore_mtime)
188 bar_len += strlen (dep_name (d)) + 1;
189 else
190 plus_len += strlen (dep_name (d)) + 1;
194 if (bar_len == 0)
195 bar_len++;
197 if (plus_len == 0)
198 plus_len++;
200 if (plus_len > plus_max)
201 plus_value = xrealloc (plus_value, plus_max = plus_len);
203 cp = plus_value;
205 qmark_len = plus_len + 1; /* Will be this or less. */
206 for (d = file->deps; d != 0; d = d->next)
207 if (! d->ignore_mtime && ! d->need_2nd_expansion)
209 const char *c = dep_name (d);
211 #ifndef NO_ARCHIVES
212 if (ar_name (c))
214 c = strchr (c, '(') + 1;
215 len = strlen (c) - 1;
217 else
218 #endif
219 len = strlen (c);
221 memcpy (cp, c, len);
222 cp += len;
223 *cp++ = FILE_LIST_SEPARATOR;
224 if (! (d->changed || always_make_flag))
225 qmark_len -= len + 1; /* Don't space in $? for this one. */
228 /* Kill the last space and define the variable. */
230 cp[cp > plus_value ? -1 : 0] = '\0';
231 DEFINE_VARIABLE ("+", 1, plus_value);
233 /* Compute the values for $^, $?, and $|. */
235 cp = caret_value = plus_value; /* Reuse the buffer; it's big enough. */
237 if (qmark_len > qmark_max)
238 qmark_value = xrealloc (qmark_value, qmark_max = qmark_len);
239 qp = qmark_value;
241 if (bar_len > bar_max)
242 bar_value = xrealloc (bar_value, bar_max = bar_len);
243 bp = bar_value;
245 /* Make sure that no dependencies are repeated in $^, $?, and $|. It
246 would be natural to combine the next two loops but we can't do it
247 because of a situation where we have two dep entries, the first
248 is order-only and the second is normal (see below). */
250 hash_init (&dep_hash, 500, dep_hash_1, dep_hash_2, dep_hash_cmp);
252 for (d = file->deps; d != 0; d = d->next)
254 if (d->need_2nd_expansion)
255 continue;
257 slot = hash_find_slot (&dep_hash, d);
258 if (HASH_VACANT (*slot))
259 hash_insert_at (&dep_hash, d, slot);
260 else
262 /* Check if the two prerequisites have different ignore_mtime.
263 If so then we need to "upgrade" one that is order-only. */
265 struct dep* hd = (struct dep*) *slot;
267 if (d->ignore_mtime != hd->ignore_mtime)
268 d->ignore_mtime = hd->ignore_mtime = 0;
272 for (d = file->deps; d != 0; d = d->next)
274 const char *c;
276 if (d->need_2nd_expansion || hash_find_item (&dep_hash, d) != d)
277 continue;
279 c = dep_name (d);
280 #ifndef NO_ARCHIVES
281 if (ar_name (c))
283 c = strchr (c, '(') + 1;
284 len = strlen (c) - 1;
286 else
287 #endif
288 len = strlen (c);
290 if (d->ignore_mtime)
292 memcpy (bp, c, len);
293 bp += len;
294 *bp++ = FILE_LIST_SEPARATOR;
296 else
298 memcpy (cp, c, len);
299 cp += len;
300 *cp++ = FILE_LIST_SEPARATOR;
301 if (d->changed || always_make_flag)
303 memcpy (qp, c, len);
304 qp += len;
305 *qp++ = FILE_LIST_SEPARATOR;
310 hash_free (&dep_hash, 0);
312 /* Kill the last spaces and define the variables. */
314 cp[cp > caret_value ? -1 : 0] = '\0';
315 DEFINE_VARIABLE ("^", 1, caret_value);
317 qp[qp > qmark_value ? -1 : 0] = '\0';
318 DEFINE_VARIABLE ("?", 1, qmark_value);
320 bp[bp > bar_value ? -1 : 0] = '\0';
321 DEFINE_VARIABLE ("|", 1, bar_value);
324 #undef DEFINE_VARIABLE
327 /* Chop CMDS up into individual command lines if necessary.
328 Also set the `lines_flags' and `any_recurse' members. */
330 void
331 chop_commands (struct commands *cmds)
333 const char *p;
334 unsigned int nlines, idx;
335 char **lines;
337 /* If we don't have any commands,
338 or we already parsed them, never mind. */
340 if (!cmds || cmds->command_lines != 0)
341 return;
343 /* Chop CMDS->commands up into lines in CMDS->command_lines.
344 Also set the corresponding CMDS->lines_flags elements,
345 and the CMDS->any_recurse flag. */
347 nlines = 5;
348 lines = xmalloc (5 * sizeof (char *));
349 idx = 0;
350 p = cmds->commands;
351 while (*p != '\0')
353 const char *end = p;
354 find_end:;
355 end = strchr (end, '\n');
356 if (end == 0)
357 end = p + strlen (p);
358 else if (end > p && end[-1] == '\\')
360 int backslash = 1;
361 const char *b;
362 for (b = end - 2; b >= p && *b == '\\'; --b)
363 backslash = !backslash;
364 if (backslash)
366 ++end;
367 goto find_end;
371 if (idx == nlines)
373 nlines += 2;
374 lines = xrealloc (lines, nlines * sizeof (char *));
376 lines[idx++] = xstrndup (p, end - p);
377 p = end;
378 if (*p != '\0')
379 ++p;
382 if (idx != nlines)
384 nlines = idx;
385 lines = xrealloc (lines, nlines * sizeof (char *));
388 cmds->ncommand_lines = nlines;
389 cmds->command_lines = lines;
391 cmds->any_recurse = 0;
392 cmds->lines_flags = xmalloc (nlines);
393 for (idx = 0; idx < nlines; ++idx)
395 int flags = 0;
397 for (p = lines[idx];
398 isblank ((unsigned char)*p) || *p == '-' || *p == '@' || *p == '+';
399 ++p)
400 switch (*p)
402 case '+':
403 flags |= COMMANDS_RECURSE;
404 break;
405 case '@':
406 flags |= COMMANDS_SILENT;
407 break;
408 case '-':
409 flags |= COMMANDS_NOERROR;
410 break;
413 /* If no explicit '+' was given, look for MAKE variable references. */
414 if (!(flags & COMMANDS_RECURSE)
415 && (strstr (p, "$(MAKE)") != 0 || strstr (p, "${MAKE}") != 0))
416 flags |= COMMANDS_RECURSE;
418 cmds->lines_flags[idx] = flags;
419 cmds->any_recurse |= flags & COMMANDS_RECURSE;
423 /* Execute the commands to remake FILE. If they are currently executing,
424 return or have already finished executing, just return. Otherwise,
425 fork off a child process to run the first command line in the sequence. */
427 void
428 execute_file_commands (struct file *file)
430 const char *p;
432 /* Don't go through all the preparations if
433 the commands are nothing but whitespace. */
435 for (p = file->cmds->commands; *p != '\0'; ++p)
436 if (!isspace ((unsigned char)*p) && *p != '-' && *p != '@')
437 break;
438 if (*p == '\0')
440 /* If there are no commands, assume everything worked. */
441 set_command_state (file, cs_running);
442 file->update_status = 0;
443 notice_finished_file (file);
444 return;
447 /* First set the automatic variables according to this file. */
449 initialize_file_variables (file, 0);
451 set_file_variables (file);
453 /* Start the commands running. */
454 new_job (file);
457 /* This is set while we are inside fatal_error_signal,
458 so things can avoid nonreentrant operations. */
460 int handling_fatal_signal = 0;
462 /* Handle fatal signals. */
464 RETSIGTYPE
465 fatal_error_signal (int sig)
467 #ifdef __MSDOS__
468 extern int dos_status, dos_command_running;
470 if (dos_command_running)
472 /* That was the child who got the signal, not us. */
473 dos_status |= (sig << 8);
474 return;
476 remove_intermediates (1);
477 exit (EXIT_FAILURE);
478 #else /* not __MSDOS__ */
479 #ifdef _AMIGA
480 remove_intermediates (1);
481 if (sig == SIGINT)
482 fputs (_("*** Break.\n"), stderr);
484 exit (10);
485 #else /* not Amiga */
486 #ifdef WINDOWS32
487 extern HANDLE main_thread;
489 /* Windows creates a sperate thread for handling Ctrl+C, so we need
490 to suspend the main thread, or else we will have race conditions
491 when both threads call reap_children. */
492 if (main_thread)
494 DWORD susp_count = SuspendThread (main_thread);
496 if (susp_count != 0)
497 fprintf (stderr, "SuspendThread: suspend count = %ld\n", susp_count);
498 else if (susp_count == (DWORD)-1)
500 DWORD ierr = GetLastError ();
502 fprintf (stderr, "SuspendThread: error %ld: %s\n",
503 ierr, map_windows32_error_to_string (ierr));
506 #endif
507 handling_fatal_signal = 1;
509 /* Set the handling for this signal to the default.
510 It is blocked now while we run this handler. */
511 signal (sig, SIG_DFL);
513 /* A termination signal won't be sent to the entire
514 process group, but it means we want to kill the children. */
516 if (sig == SIGTERM)
518 struct child *c;
519 for (c = children; c != 0; c = c->next)
520 if (!c->remote)
521 (void) kill (c->pid, SIGTERM);
524 /* If we got a signal that means the user
525 wanted to kill make, remove pending targets. */
527 if (sig == SIGTERM || sig == SIGINT
528 #ifdef SIGHUP
529 || sig == SIGHUP
530 #endif
531 #ifdef SIGQUIT
532 || sig == SIGQUIT
533 #endif
536 struct child *c;
538 /* Remote children won't automatically get signals sent
539 to the process group, so we must send them. */
540 for (c = children; c != 0; c = c->next)
541 if (c->remote)
542 (void) remote_kill (c->pid, sig);
544 for (c = children; c != 0; c = c->next)
545 delete_child_targets (c);
547 /* Clean up the children. We don't just use the call below because
548 we don't want to print the "Waiting for children" message. */
549 while (job_slots_used > 0)
550 reap_children (1, 0);
552 else
553 /* Wait for our children to die. */
554 while (job_slots_used > 0)
555 reap_children (1, 1);
557 /* Delete any non-precious intermediate files that were made. */
559 remove_intermediates (1);
561 #ifdef SIGQUIT
562 if (sig == SIGQUIT)
563 /* We don't want to send ourselves SIGQUIT, because it will
564 cause a core dump. Just exit instead. */
565 exit (EXIT_FAILURE);
566 #endif
568 #ifdef WINDOWS32
569 if (main_thread)
570 CloseHandle (main_thread);
571 /* Cannot call W32_kill with a pid (it needs a handle). The exit
572 status of 130 emulates what happens in Bash. */
573 exit (130);
574 #else
575 /* Signal the same code; this time it will really be fatal. The signal
576 will be unblocked when we return and arrive then to kill us. */
577 if (kill (getpid (), sig) < 0)
578 pfatal_with_name ("kill");
579 #endif /* not WINDOWS32 */
580 #endif /* not Amiga */
581 #endif /* not __MSDOS__ */
584 /* Delete FILE unless it's precious or not actually a file (phony),
585 and it has changed on disk since we last stat'd it. */
587 static void
588 delete_target (struct file *file, const char *on_behalf_of)
590 struct stat st;
591 int e;
593 if (file->precious || file->phony)
594 return;
596 #ifndef NO_ARCHIVES
597 if (ar_name (file->name))
599 time_t file_date = (file->last_mtime == NONEXISTENT_MTIME
600 ? (time_t) -1
601 : (time_t) FILE_TIMESTAMP_S (file->last_mtime));
602 if (ar_member_date (file->name) != file_date)
604 if (on_behalf_of)
605 error (NILF, _("*** [%s] Archive member `%s' may be bogus; not deleted"),
606 on_behalf_of, file->name);
607 else
608 error (NILF, _("*** Archive member `%s' may be bogus; not deleted"),
609 file->name);
611 return;
613 #endif
615 EINTRLOOP (e, stat (file->name, &st));
616 if (e == 0
617 && S_ISREG (st.st_mode)
618 && FILE_TIMESTAMP_STAT_MODTIME (file->name, st) != file->last_mtime)
620 if (on_behalf_of)
621 error (NILF, _("*** [%s] Deleting file `%s'"), on_behalf_of, file->name);
622 else
623 error (NILF, _("*** Deleting file `%s'"), file->name);
624 if (unlink (file->name) < 0
625 && errno != ENOENT) /* It disappeared; so what. */
626 perror_with_name ("unlink: ", file->name);
631 /* Delete all non-precious targets of CHILD unless they were already deleted.
632 Set the flag in CHILD to say they've been deleted. */
634 void
635 delete_child_targets (struct child *child)
637 struct dep *d;
639 if (child->deleted)
640 return;
642 /* Delete the target file if it changed. */
643 delete_target (child->file, NULL);
645 /* Also remove any non-precious targets listed in the `also_make' member. */
646 for (d = child->file->also_make; d != 0; d = d->next)
647 delete_target (d->file, child->file->name);
649 child->deleted = 1;
652 /* Print out the commands in CMDS. */
654 void
655 print_commands (const struct commands *cmds)
657 const char *s;
659 fputs (_("# recipe to execute"), stdout);
661 if (cmds->fileinfo.filenm == 0)
662 puts (_(" (built-in):"));
663 else
664 printf (_(" (from `%s', line %lu):\n"),
665 cmds->fileinfo.filenm, cmds->fileinfo.lineno);
667 s = cmds->commands;
668 while (*s != '\0')
670 const char *end;
672 end = strchr (s, '\n');
673 if (end == 0)
674 end = s + strlen (s);
676 printf ("%c%.*s\n", cmd_prefix, (int) (end - s), s);
678 s = end + (end[0] == '\n');