main.c revision 213494
1/*-
2 * Copyright (c) 1988, 1989, 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1989 by Berkeley Softworks
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Adam de Boor.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)main.c      8.3 (Berkeley) 3/19/94
39 */
40
41#ifndef lint
42#if 0
43static char copyright[] =
44"@(#) Copyright (c) 1988, 1989, 1990, 1993\n\
45	The Regents of the University of California.  All rights reserved.\n";
46#endif
47#endif /* not lint */
48#include <sys/cdefs.h>
49__FBSDID("$FreeBSD: head/usr.bin/make/main.c 213494 2010-10-06 20:54:17Z imp $");
50
51/*
52 * main.c
53 *	The main file for this entire program. Exit routines etc
54 *	reside here.
55 *
56 * Utility functions defined in this file:
57 *	Main_ParseArgLine
58 *			Takes a line of arguments, breaks them and
59 *			treats them as if they were given when first
60 *			invoked. Used by the parse module to implement
61 *			the .MFLAGS target.
62 */
63
64#include <sys/param.h>
65#include <sys/stat.h>
66#include <sys/time.h>
67#include <sys/queue.h>
68#include <sys/resource.h>
69#include <sys/utsname.h>
70#include <sys/wait.h>
71#include <err.h>
72#include <errno.h>
73#include <stdlib.h>
74#include <string.h>
75#include <unistd.h>
76
77#include "arch.h"
78#include "buf.h"
79#include "config.h"
80#include "dir.h"
81#include "globals.h"
82#include "GNode.h"
83#include "job.h"
84#include "make.h"
85#include "parse.h"
86#include "pathnames.h"
87#include "shell.h"
88#include "str.h"
89#include "suff.h"
90#include "targ.h"
91#include "util.h"
92#include "var.h"
93
94extern char **environ;	/* XXX what header declares this variable? */
95
96#define	WANT_ENV_MKLVL	1
97#define	MKLVL_MAXVAL	500
98#define	MKLVL_ENVVAR	"__MKLVL__"
99
100/* ordered list of makefiles to read */
101static Lst makefiles = Lst_Initializer(makefiles);
102
103/* ordered list of source makefiles */
104static Lst source_makefiles = Lst_Initializer(source_makefiles);
105
106/* list of variables to print */
107static Lst variables = Lst_Initializer(variables);
108
109static Boolean	expandVars;	/* fully expand printed variables */
110static Boolean	noBuiltins;	/* -r flag */
111static Boolean	forceJobs;	/* -j argument given */
112static char	*curdir;	/* startup directory */
113static char	*objdir;	/* where we chdir'ed to */
114static char	**save_argv;	/* saved argv */
115static char	*save_makeflags;/* saved MAKEFLAGS */
116
117/* (-E) vars to override from env */
118Lst envFirstVars = Lst_Initializer(envFirstVars);
119
120/* Targets to be made */
121Lst create = Lst_Initializer(create);
122
123Boolean		allPrecious;	/* .PRECIOUS given on line by itself */
124Boolean		is_posix;	/* .POSIX target seen */
125Boolean		mfAutoDeps;	/* .MAKEFILEDEPS target seen */
126Boolean		remakingMakefiles; /* True if remaking makefiles is in progress */
127Boolean		beSilent;	/* -s flag */
128Boolean		beVerbose;	/* -v flag */
129Boolean		beQuiet;	/* -Q flag */
130Boolean		compatMake;	/* -B argument */
131int		debug;		/* -d flag */
132Boolean		ignoreErrors;	/* -i flag */
133int		jobLimit;	/* -j argument */
134int		makeErrors;	/* Number of targets not remade due to errors */
135Boolean		jobsRunning;	/* TRUE if the jobs might be running */
136Boolean		keepgoing;	/* -k flag */
137Boolean		noExecute;	/* -n flag */
138Boolean		printGraphOnly;	/* -p flag */
139Boolean		queryFlag;	/* -q flag */
140Boolean		touchFlag;	/* -t flag */
141Boolean		usePipes;	/* !-P flag */
142uint32_t	warn_cmd;	/* command line warning flags */
143uint32_t	warn_flags;	/* actual warning flags */
144uint32_t	warn_nocmd;	/* command line no-warning flags */
145
146time_t		now;		/* Time at start of make */
147struct GNode	*DEFAULT;	/* .DEFAULT node */
148
149/**
150 * Exit with usage message.
151 */
152static void
153usage(void)
154{
155	fprintf(stderr,
156	    "usage: make [-BPSXeiknpqrstv] [-C directory] [-D variable]\n"
157	    "\t[-d flags] [-E variable] [-f makefile] [-I directory]\n"
158	    "\t[-j max_jobs] [-m directory] [-V variable]\n"
159	    "\t[variable=value] [target ...]\n");
160	exit(2);
161}
162
163/**
164 * MFLAGS_append
165 *	Append a flag with an optional argument to MAKEFLAGS and MFLAGS
166 */
167static void
168MFLAGS_append(const char *flag, char *arg)
169{
170	char *str;
171
172	Var_Append(".MAKEFLAGS", flag, VAR_GLOBAL);
173	if (arg != NULL) {
174		str = MAKEFLAGS_quote(arg);
175		Var_Append(".MAKEFLAGS", str, VAR_GLOBAL);
176		free(str);
177	}
178
179	Var_Append("MFLAGS", flag, VAR_GLOBAL);
180	if (arg != NULL) {
181		str = MAKEFLAGS_quote(arg);
182		Var_Append("MFLAGS", str, VAR_GLOBAL);
183		free(str);
184	}
185}
186
187/**
188 * Main_ParseWarn
189 *
190 *	Handle argument to warning option.
191 */
192int
193Main_ParseWarn(const char *arg, int iscmd)
194{
195	int i, neg;
196
197	static const struct {
198		const char	*option;
199		uint32_t	flag;
200	} options[] = {
201		{ "dirsyntax",	WARN_DIRSYNTAX },
202		{ NULL,		0 }
203	};
204
205	neg = 0;
206	if (arg[0] == 'n' && arg[1] == 'o') {
207		neg = 1;
208		arg += 2;
209	}
210
211	for (i = 0; options[i].option != NULL; i++)
212		if (strcmp(arg, options[i].option) == 0)
213			break;
214
215	if (options[i].option == NULL)
216		/* unknown option */
217		return (-1);
218
219	if (iscmd) {
220		if (!neg) {
221			warn_cmd |= options[i].flag;
222			warn_nocmd &= ~options[i].flag;
223			warn_flags |= options[i].flag;
224		} else {
225			warn_nocmd |= options[i].flag;
226			warn_cmd &= ~options[i].flag;
227			warn_flags &= ~options[i].flag;
228		}
229	} else {
230		if (!neg) {
231			warn_flags |= (options[i].flag & ~warn_nocmd);
232		} else {
233			warn_flags &= ~(options[i].flag | warn_cmd);
234		}
235	}
236	return (0);
237}
238
239/**
240 * Open and parse the given makefile.
241 *
242 * Results:
243 *	TRUE if ok. FALSE if couldn't open file.
244 */
245static Boolean
246ReadMakefile(const char p[])
247{
248	char *fname, *fnamesave;	/* makefile to read */
249	FILE *stream;
250	char *name, path[MAXPATHLEN];
251	char *MAKEFILE;
252	int setMAKEFILE;
253
254	/* XXX - remove this once constification is done */
255	fnamesave = fname = estrdup(p);
256
257	if (!strcmp(fname, "-")) {
258		Parse_File("(stdin)", stdin);
259		Var_SetGlobal("MAKEFILE", "");
260	} else {
261		setMAKEFILE = strcmp(fname, ".depend");
262
263		/* if we've chdir'd, rebuild the path name */
264		if (curdir != objdir && *fname != '/') {
265			snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
266			/*
267			 * XXX The realpath stuff breaks relative includes
268			 * XXX in some cases.   The problem likely is in
269			 * XXX parse.c where it does special things in
270			 * XXX ParseDoInclude if the file is relateive
271			 * XXX or absolute and not a system file.  There
272			 * XXX it assumes that if the current file that's
273			 * XXX being included is absolute, that any files
274			 * XXX that it includes shouldn't do the -I path
275			 * XXX stuff, which is inconsistant with historical
276			 * XXX behavior.  However, I can't pentrate the mists
277			 * XXX further, so I'm putting this workaround in
278			 * XXX here until such time as the underlying bug
279			 * XXX can be fixed.
280			 */
281#if THIS_BREAKS_THINGS
282			if (realpath(path, path) != NULL &&
283			    (stream = fopen(path, "r")) != NULL) {
284				MAKEFILE = fname;
285				fname = path;
286				goto found;
287			}
288		} else if (realpath(fname, path) != NULL) {
289			MAKEFILE = fname;
290			fname = path;
291			if ((stream = fopen(fname, "r")) != NULL)
292				goto found;
293		}
294#else
295			if ((stream = fopen(path, "r")) != NULL) {
296				MAKEFILE = fname;
297				fname = path;
298				goto found;
299			}
300		} else {
301			MAKEFILE = fname;
302			if ((stream = fopen(fname, "r")) != NULL)
303				goto found;
304		}
305#endif
306		/* look in -I and system include directories. */
307		name = Path_FindFile(fname, &parseIncPath);
308		if (!name)
309			name = Path_FindFile(fname, &sysIncPath);
310		if (!name || !(stream = fopen(name, "r"))) {
311			free(fnamesave);
312			return (FALSE);
313		}
314		MAKEFILE = fname = name;
315		/*
316		 * set the MAKEFILE variable desired by System V fans -- the
317		 * placement of the setting here means it gets set to the last
318		 * makefile specified, as it is set by SysV make.
319		 */
320found:
321		if (setMAKEFILE)
322			Var_SetGlobal("MAKEFILE", MAKEFILE);
323		Parse_File(fname, stream);
324	}
325	free(fnamesave);
326	return (TRUE);
327}
328
329/**
330 * Open and parse the given makefile.
331 * If open is successful add it to the list of makefiles.
332 *
333 * Results:
334 *	TRUE if ok. FALSE if couldn't open file.
335 */
336static Boolean
337TryReadMakefile(const char p[])
338{
339	char *data;
340	LstNode *last = Lst_Last(&source_makefiles);
341
342	if (!ReadMakefile(p))
343		return (FALSE);
344
345	data = estrdup(p);
346	if (last == NULL) {
347		LstNode *first = Lst_First(&source_makefiles);
348		Lst_Insert(&source_makefiles, first, data);
349	} else
350		Lst_Append(&source_makefiles, last, estrdup(p));
351	return (TRUE);
352}
353
354/**
355 * MainParseArgs
356 *	Parse a given argument vector. Called from main() and from
357 *	Main_ParseArgLine() when the .MAKEFLAGS target is used.
358 *
359 *	XXX: Deal with command line overriding .MAKEFLAGS in makefile
360 *
361 * Side Effects:
362 *	Various global and local flags will be set depending on the flags
363 *	given
364 */
365static void
366MainParseArgs(int argc, char **argv)
367{
368	int c;
369	Boolean	found_dd = FALSE;
370	char found_dir[MAXPATHLEN + 1];	/* for searching for sys.mk */
371
372rearg:
373	optind = 1;	/* since we're called more than once */
374	optreset = 1;
375#define OPTFLAGS "ABC:D:d:E:ef:I:ij:km:nPpQqrSstV:vXx:"
376	for (;;) {
377		if ((optind < argc) && strcmp(argv[optind], "--") == 0) {
378			found_dd = TRUE;
379		}
380		if ((c = getopt(argc, argv, OPTFLAGS)) == -1) {
381			break;
382		}
383		switch(c) {
384
385		case 'A':
386			arch_fatal = FALSE;
387			MFLAGS_append("-A", NULL);
388			break;
389		case 'B':
390			compatMake = TRUE;
391			MFLAGS_append("-B", NULL);
392			unsetenv("MAKE_JOBS_FIFO");
393			break;
394		case 'C':
395			if (chdir(optarg) == -1)
396				err(1, "chdir %s", optarg);
397			if (getcwd(curdir, MAXPATHLEN) == NULL)
398				err(2, NULL);
399			break;
400		case 'D':
401			Var_SetGlobal(optarg, "1");
402			MFLAGS_append("-D", optarg);
403			break;
404		case 'd': {
405			char *modules = optarg;
406
407			for (; *modules; ++modules)
408				switch (*modules) {
409				case 'A':
410					debug = ~0;
411					break;
412				case 'a':
413					debug |= DEBUG_ARCH;
414					break;
415				case 'c':
416					debug |= DEBUG_COND;
417					break;
418				case 'd':
419					debug |= DEBUG_DIR;
420					break;
421				case 'f':
422					debug |= DEBUG_FOR;
423					break;
424				case 'g':
425					if (modules[1] == '1') {
426						debug |= DEBUG_GRAPH1;
427						++modules;
428					}
429					else if (modules[1] == '2') {
430						debug |= DEBUG_GRAPH2;
431						++modules;
432					}
433					break;
434				case 'j':
435					debug |= DEBUG_JOB;
436					break;
437				case 'l':
438					debug |= DEBUG_LOUD;
439					break;
440				case 'm':
441					debug |= DEBUG_MAKE;
442					break;
443				case 's':
444					debug |= DEBUG_SUFF;
445					break;
446				case 't':
447					debug |= DEBUG_TARG;
448					break;
449				case 'v':
450					debug |= DEBUG_VAR;
451					break;
452				default:
453					warnx("illegal argument to d option "
454					    "-- %c", *modules);
455					usage();
456				}
457			MFLAGS_append("-d", optarg);
458			break;
459		}
460		case 'E':
461			Lst_AtEnd(&envFirstVars, estrdup(optarg));
462			MFLAGS_append("-E", optarg);
463			break;
464		case 'e':
465			checkEnvFirst = TRUE;
466			MFLAGS_append("-e", NULL);
467			break;
468		case 'f':
469			Lst_AtEnd(&makefiles, estrdup(optarg));
470			break;
471		case 'I':
472			Parse_AddIncludeDir(optarg);
473			MFLAGS_append("-I", optarg);
474			break;
475		case 'i':
476			ignoreErrors = TRUE;
477			MFLAGS_append("-i", NULL);
478			break;
479		case 'j': {
480			char *endptr;
481
482			forceJobs = TRUE;
483			jobLimit = strtol(optarg, &endptr, 10);
484			if (jobLimit <= 0 || *endptr != '\0') {
485				warnx("illegal number, -j argument -- %s",
486				    optarg);
487				usage();
488			}
489			MFLAGS_append("-j", optarg);
490			break;
491		}
492		case 'k':
493			keepgoing = TRUE;
494			MFLAGS_append("-k", NULL);
495			break;
496		case 'm':
497			/* look for magic parent directory search string */
498			if (strncmp(".../", optarg, 4) == 0) {
499				if (!Dir_FindHereOrAbove(curdir, optarg + 4,
500				    found_dir, sizeof(found_dir)))
501					break;		/* nothing doing */
502				Path_AddDir(&sysIncPath, found_dir);
503			} else {
504				Path_AddDir(&sysIncPath, optarg);
505			}
506			MFLAGS_append("-m", optarg);
507			break;
508		case 'n':
509			noExecute = TRUE;
510			MFLAGS_append("-n", NULL);
511			break;
512		case 'P':
513			usePipes = FALSE;
514			MFLAGS_append("-P", NULL);
515			break;
516		case 'p':
517			printGraphOnly = TRUE;
518			debug |= DEBUG_GRAPH1;
519			break;
520		case 'Q':
521			beQuiet = TRUE;
522			beVerbose = FALSE;
523			MFLAGS_append("-Q", NULL);
524			break;
525		case 'q':
526			queryFlag = TRUE;
527			/* Kind of nonsensical, wot? */
528			MFLAGS_append("-q", NULL);
529			break;
530		case 'r':
531			noBuiltins = TRUE;
532			MFLAGS_append("-r", NULL);
533			break;
534		case 'S':
535			keepgoing = FALSE;
536			MFLAGS_append("-S", NULL);
537			break;
538		case 's':
539			beSilent = TRUE;
540			MFLAGS_append("-s", NULL);
541			break;
542		case 't':
543			touchFlag = TRUE;
544			MFLAGS_append("-t", NULL);
545			break;
546		case 'V':
547			Lst_AtEnd(&variables, estrdup(optarg));
548			MFLAGS_append("-V", optarg);
549			break;
550		case 'v':
551			beVerbose = TRUE;
552			beQuiet = FALSE;
553			MFLAGS_append("-v", NULL);
554			break;
555		case 'X':
556			expandVars = FALSE;
557			break;
558		case 'x':
559			if (Main_ParseWarn(optarg, 1) != -1)
560				MFLAGS_append("-x", optarg);
561			break;
562
563		default:
564		case '?':
565			usage();
566		}
567	}
568	argv += optind;
569	argc -= optind;
570
571	oldVars = TRUE;
572
573	/*
574	 * Parse the rest of the arguments.
575	 *	o Check for variable assignments and perform them if so.
576	 *	o Check for more flags and restart getopt if so.
577	 *	o Anything else is taken to be a target and added
578	 *	  to the end of the "create" list.
579	 */
580	for (; *argv != NULL; ++argv, --argc) {
581		if (Parse_IsVar(*argv)) {
582			char *ptr = MAKEFLAGS_quote(*argv);
583			char *v = estrdup(*argv);
584
585			Var_Append(".MAKEFLAGS", ptr, VAR_GLOBAL);
586			Parse_DoVar(v, VAR_CMD);
587			free(ptr);
588			free(v);
589
590		} else if ((*argv)[0] == '-') {
591			if ((*argv)[1] == '\0') {
592				/*
593				 * (*argv) is a single dash, so we
594				 * just ignore it.
595				 */
596			} else if (found_dd) {
597				/*
598				 * Double dash has been found, ignore
599				 * any more options.  But what do we do
600				 * with it?  For now treat it like a target.
601				 */
602				Lst_AtEnd(&create, estrdup(*argv));
603			} else {
604				/*
605				 * (*argv) is a -flag, so backup argv and
606				 * argc.  getopt() expects options to start
607				 * in the 2nd position.
608				 */
609				argc++;
610				argv--;
611				goto rearg;
612			}
613
614		} else if ((*argv)[0] == '\0') {
615			Punt("illegal (null) argument.");
616
617		} else {
618			Lst_AtEnd(&create, estrdup(*argv));
619		}
620	}
621}
622
623/**
624 * Main_ParseArgLine
625 *	Used by the parse module when a .MFLAGS or .MAKEFLAGS target
626 *	is encountered and by main() when reading the .MAKEFLAGS envariable.
627 *	Takes a line of arguments and breaks it into its
628 *	component words and passes those words and the number of them to the
629 *	MainParseArgs function.
630 *	The line should have all its leading whitespace removed.
631 *
632 * Side Effects:
633 *	Only those that come from the various arguments.
634 */
635void
636Main_ParseArgLine(char *line, int mflags)
637{
638	ArgArray	aa;
639
640	if (line == NULL)
641		return;
642	for (; *line == ' '; ++line)
643		continue;
644	if (!*line)
645		return;
646
647	if (mflags)
648		MAKEFLAGS_break(&aa, line);
649	else
650		brk_string(&aa, line, TRUE);
651
652	MainParseArgs(aa.argc, aa.argv);
653	ArgArray_Done(&aa);
654}
655
656static char *
657chdir_verify_path(const char *path, char *obpath)
658{
659	struct stat sb;
660
661	if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
662		if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
663			warn("warning: %s", path);
664			return (NULL);
665		}
666		return (obpath);
667	}
668
669	return (NULL);
670}
671
672/**
673 * In lieu of a good way to prevent every possible looping in make(1), stop
674 * there from being more than MKLVL_MAXVAL processes forked by make(1), to
675 * prevent a forkbomb from happening, in a dumb and mechanical way.
676 *
677 * Side Effects:
678 *	Creates or modifies enviornment variable MKLVL_ENVVAR via setenv().
679 */
680static void
681check_make_level(void)
682{
683#ifdef WANT_ENV_MKLVL
684	char	*value = getenv(MKLVL_ENVVAR);
685	int	level = (value == NULL) ? 0 : atoi(value);
686
687	if (level < 0) {
688		errx(2, "Invalid value for recursion level (%d).", level);
689	} else if (level > MKLVL_MAXVAL) {
690		errx(2, "Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
691	} else {
692		char new_value[32];
693		sprintf(new_value, "%d", level + 1);
694		setenv(MKLVL_ENVVAR, new_value, 1);
695	}
696#endif /* WANT_ENV_MKLVL */
697}
698
699/**
700 * Main_AddSourceMakefile
701 *	Add a file to the list of source makefiles
702 */
703void
704Main_AddSourceMakefile(const char *name)
705{
706
707	Lst_AtEnd(&source_makefiles, estrdup(name));
708}
709
710/**
711 * Remake_Makefiles
712 *	Remake all the makefiles
713 */
714static void
715Remake_Makefiles(void)
716{
717	Lst cleanup;
718	LstNode *ln;
719	int error_cnt = 0;
720	int remade_cnt = 0;
721
722	Compat_InstallSignalHandlers();
723	if (curdir != objdir) {
724		if (chdir(curdir) < 0)
725			Fatal("Failed to change directory to %s.", curdir);
726	}
727
728	Lst_Init(&cleanup);
729	LST_FOREACH(ln, &source_makefiles) {
730		LstNode *ln2;
731		struct GNode *gn;
732		const char *name = Lst_Datum(ln);
733		Boolean saveTouchFlag = touchFlag;
734		Boolean saveQueryFlag = queryFlag;
735		Boolean saveNoExecute = noExecute;
736		int mtime;
737
738		/*
739		 * Create node
740		 */
741		gn = Targ_FindNode(name, TARG_CREATE);
742		DEBUGF(MAKE, ("Checking %s...", gn->name));
743		Suff_FindDeps(gn);
744
745		/*
746		 * -t, -q and -n has no effect unless the makefile is
747		 * specified as one of the targets explicitly in the
748		 * command line
749		 */
750		LST_FOREACH(ln2, &create) {
751			if (!strcmp(gn->name, Lst_Datum(ln2))) {
752				/* found as a target */
753				break;
754			}
755		}
756		if (ln2 == NULL) {
757			touchFlag = FALSE;
758			queryFlag = FALSE;
759			noExecute = FALSE;
760		}
761
762		/*
763		 * Check and remake the makefile
764		 */
765		mtime = Dir_MTime(gn);
766		remakingMakefiles = TRUE;
767		Compat_Make(gn, gn);
768		remakingMakefiles = FALSE;
769
770		/*
771		 * Restore -t, -q and -n behaviour
772		 */
773		touchFlag = saveTouchFlag;
774		queryFlag = saveQueryFlag;
775		noExecute = saveNoExecute;
776
777		/*
778		 * Compat_Make will leave the 'made' field of gn
779		 * in one of the following states:
780		 *	UPTODATE  gn was already up-to-date
781		 *	MADE	  gn was recreated successfully
782		 *	ERROR	  An error occurred while gn was being created
783		 *	ABORTED	  gn was not remade because one of its inferiors
784		 *		  could not be made due to errors.
785		 */
786		if (gn->made == MADE) {
787			if (mtime != Dir_MTime(gn)) {
788				DEBUGF(MAKE,
789				    ("%s updated (%d -> %d).\n",
790				     gn->name, mtime, gn->mtime));
791				remade_cnt++;
792			} else {
793				DEBUGF(MAKE,
794				    ("%s not updated: skipping restart.\n",
795				     gn->name));
796			}
797		} else if (gn->made == ERROR)
798			error_cnt++;
799		else if (gn->made == ABORTED) {
800			printf("`%s' not remade because of errors.\n",
801			    gn->name);
802			error_cnt++;
803		} else if (gn->made == UPTODATE) {
804			Lst_EnQueue(&cleanup, gn);
805		}
806	}
807
808	if (error_cnt > 0)
809		Fatal("Failed to remake Makefiles.");
810	if (remade_cnt > 0) {
811		DEBUGF(MAKE, ("Restarting `%s'.\n", save_argv[0]));
812
813		/*
814		 * Some of makefiles were remade -- restart from clean state
815		 */
816		if (save_makeflags != NULL)
817			setenv("MAKEFLAGS", save_makeflags, 1);
818		else
819			unsetenv("MAKEFLAGS");
820		if (execvp(save_argv[0], save_argv) < 0) {
821			Fatal("Can't restart `%s': %s.",
822			    save_argv[0], strerror(errno));
823		}
824	}
825
826	while (!Lst_IsEmpty(&cleanup)) {
827		GNode *gn = Lst_DeQueue(&cleanup);
828
829		gn->unmade = 0;
830		gn->make = FALSE;
831		gn->made = UNMADE;
832		gn->childMade = FALSE;
833		gn->mtime = gn->cmtime = 0;
834		gn->cmtime_gn = NULL;
835
836		LST_FOREACH(ln, &gn->children) {
837			GNode *cgn = Lst_Datum(ln);
838
839			gn->unmade++;
840			Lst_EnQueue(&cleanup, cgn);
841		}
842	}
843
844	if (curdir != objdir) {
845		if (chdir(objdir) < 0)
846			Fatal("Failed to change directory to %s.", objdir);
847	}
848}
849
850/**
851 * main
852 *	The main function, for obvious reasons. Initializes variables
853 *	and a few modules, then parses the arguments give it in the
854 *	environment and on the command line. Reads the system makefile
855 *	followed by either Makefile, makefile or the file given by the
856 *	-f argument. Sets the .MAKEFLAGS PMake variable based on all the
857 *	flags it has received by then uses either the Make or the Compat
858 *	module to create the initial list of targets.
859 *
860 * Results:
861 *	If -q was given, exits -1 if anything was out-of-date. Else it exits
862 *	0.
863 *
864 * Side Effects:
865 *	The program exits when done. Targets are created. etc. etc. etc.
866 */
867int
868main(int argc, char **argv)
869{
870	const char *machine;
871	const char *machine_arch;
872	const char *machine_cpu;
873	Boolean outOfDate = TRUE;	/* FALSE if all targets up to date */
874	const char *p;
875	const char *pathp;
876	const char *path;
877	char mdpath[MAXPATHLEN];
878	char obpath[MAXPATHLEN];
879	char cdpath[MAXPATHLEN];
880	char found_dir[MAXPATHLEN + 1];	/* for searching for sys.mk */
881	char *cp = NULL, *start;
882
883	save_argv = argv;
884	save_makeflags = getenv("MAKEFLAGS");
885	if (save_makeflags != NULL)
886		save_makeflags = estrdup(save_makeflags);
887
888	/*
889	 * Initialize file global variables.
890	 */
891	expandVars = TRUE;
892	noBuiltins = FALSE;		/* Read the built-in rules */
893	forceJobs = FALSE;		/* No -j flag */
894	curdir = cdpath;
895
896	/*
897	 * Initialize program global variables.
898	 */
899	beSilent = FALSE;		/* Print commands as executed */
900	ignoreErrors = FALSE;		/* Pay attention to non-zero returns */
901	noExecute = FALSE;		/* Execute all commands */
902	printGraphOnly = FALSE;		/* Don't stop after printing graph */
903	keepgoing = FALSE;		/* Stop on error */
904	allPrecious = FALSE;		/* Remove targets when interrupted */
905	queryFlag = FALSE;		/* This is not just a check-run */
906	touchFlag = FALSE;		/* Actually update targets */
907	usePipes = TRUE;		/* Catch child output in pipes */
908	debug = 0;			/* No debug verbosity, please. */
909	jobsRunning = FALSE;
910
911	jobLimit = DEFMAXJOBS;
912	compatMake = FALSE;		/* No compat mode */
913
914	check_make_level();
915
916#ifdef RLIMIT_NOFILE
917	/*
918	 * get rid of resource limit on file descriptors
919	 */
920	{
921		struct rlimit rl;
922		if (getrlimit(RLIMIT_NOFILE, &rl) == -1) {
923			err(2, "getrlimit");
924		}
925		rl.rlim_cur = rl.rlim_max;
926		if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
927			err(2, "setrlimit");
928		}
929	}
930#endif
931
932	/*
933	 * Get the name of this type of MACHINE from utsname
934	 * so we can share an executable for similar machines.
935	 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
936	 *
937	 * Note that both MACHINE and MACHINE_ARCH are decided at
938	 * run-time.
939	 */
940	if ((machine = getenv("MACHINE")) == NULL) {
941		static struct utsname utsname;
942
943		if (uname(&utsname) == -1)
944			err(2, "uname");
945		machine = utsname.machine;
946	}
947
948	if ((machine_arch = getenv("MACHINE_ARCH")) == NULL) {
949#ifdef MACHINE_ARCH
950		machine_arch = MACHINE_ARCH;
951#else
952		machine_arch = "unknown";
953#endif
954	}
955
956	/*
957	 * Set machine_cpu to the minumum supported CPU revision based
958	 * on the target architecture, if not already set.
959	 */
960	if ((machine_cpu = getenv("MACHINE_CPU")) == NULL) {
961		if (!strcmp(machine_arch, "i386"))
962			machine_cpu = "i386";
963		else
964			machine_cpu = "unknown";
965	}
966
967	/*
968	 * Initialize the parsing, directory and variable modules to prepare
969	 * for the reading of inclusion paths and variable settings on the
970	 * command line
971	 */
972	Proc_Init();
973
974	Dir_Init();		/* Initialize directory structures so -I flags
975				 * can be processed correctly */
976	Var_Init(environ);	/* As well as the lists of variables for
977				 * parsing arguments */
978
979	/*
980	 * Initialize the Shell so that we have a shell for != assignments
981	 * on the command line.
982	 */
983	Shell_Init();
984
985	/*
986	 * Initialize various variables.
987	 *	MAKE also gets this name, for compatibility
988	 *	.MAKEFLAGS gets set to the empty string just in case.
989	 *	MFLAGS also gets initialized empty, for compatibility.
990	 */
991	Var_SetGlobal("MAKE", argv[0]);
992	Var_SetGlobal(".MAKEFLAGS", "");
993	Var_SetGlobal("MFLAGS", "");
994	Var_SetGlobal("MACHINE", machine);
995	Var_SetGlobal("MACHINE_ARCH", machine_arch);
996	Var_SetGlobal("MACHINE_CPU", machine_cpu);
997#ifdef MAKE_VERSION
998	Var_SetGlobal("MAKE_VERSION", MAKE_VERSION);
999#endif
1000	Var_SetGlobal(".newline", "\n");	/* handy for :@ loops */
1001	{
1002		char tmp[64];
1003
1004		snprintf(tmp, sizeof(tmp), "%u", getpid());
1005		Var_SetGlobal(".MAKE.PID", tmp);
1006		snprintf(tmp, sizeof(tmp), "%u", getppid());
1007		Var_SetGlobal(".MAKE.PPID", tmp);
1008	}
1009	Job_SetPrefix();
1010
1011	/*
1012	 * Find where we are...
1013	 */
1014	if (getcwd(curdir, MAXPATHLEN) == NULL)
1015		err(2, NULL);
1016
1017	/*
1018	 * First snag things out of the MAKEFLAGS environment
1019	 * variable.  Then parse the command line arguments.
1020	 */
1021	Main_ParseArgLine(getenv("MAKEFLAGS"), 1);
1022
1023	MainParseArgs(argc, argv);
1024
1025	/*
1026	 * Verify that cwd is sane (after -C may have changed it).
1027	 */
1028	{
1029	struct stat sa;
1030
1031	if (stat(curdir, &sa) == -1)
1032	    err(2, "%s", curdir);
1033	}
1034
1035	/*
1036	 * The object directory location is determined using the
1037	 * following order of preference:
1038	 *
1039	 *	1. MAKEOBJDIRPREFIX`cwd`
1040	 *	2. MAKEOBJDIR
1041	 *	3. PATH_OBJDIR.${MACHINE}
1042	 *	4. PATH_OBJDIR
1043	 *	5. PATH_OBJDIRPREFIX`cwd`
1044	 *
1045	 * If one of the first two fails, use the current directory.
1046	 * If the remaining three all fail, use the current directory.
1047	 *
1048	 * Once things are initted,
1049	 * have to add the original directory to the search path,
1050	 * and modify the paths for the Makefiles apropriately.  The
1051	 * current directory is also placed as a variable for make scripts.
1052	 */
1053	if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
1054		if (!(path = getenv("MAKEOBJDIR"))) {
1055			path = PATH_OBJDIR;
1056			pathp = PATH_OBJDIRPREFIX;
1057			snprintf(mdpath, MAXPATHLEN, "%s.%s", path, machine);
1058			if (!(objdir = chdir_verify_path(mdpath, obpath)))
1059				if (!(objdir=chdir_verify_path(path, obpath))) {
1060					snprintf(mdpath, MAXPATHLEN,
1061							"%s%s", pathp, curdir);
1062					if (!(objdir=chdir_verify_path(mdpath,
1063								       obpath)))
1064						objdir = curdir;
1065				}
1066		}
1067		else if (!(objdir = chdir_verify_path(path, obpath)))
1068			objdir = curdir;
1069	}
1070	else {
1071		snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
1072		if (!(objdir = chdir_verify_path(mdpath, obpath)))
1073			objdir = curdir;
1074	}
1075	Dir_InitDot();		/* Initialize the "." directory */
1076	if (objdir != curdir)
1077		Path_AddDir(&dirSearchPath, curdir);
1078	Var_SetGlobal(".ST_EXPORTVAR", "YES");
1079	Var_SetGlobal(".CURDIR", curdir);
1080	Var_SetGlobal(".OBJDIR", objdir);
1081
1082	if (getenv("MAKE_JOBS_FIFO") != NULL)
1083		forceJobs = TRUE;
1084	/*
1085	 * Be compatible if user did not specify -j and did not explicitly
1086	 * turned compatibility on
1087	 */
1088	if (!compatMake && !forceJobs)
1089		compatMake = TRUE;
1090
1091	/*
1092	 * Initialize target and suffix modules in preparation for
1093	 * parsing the makefile(s)
1094	 */
1095	Targ_Init();
1096	Suff_Init();
1097
1098	DEFAULT = NULL;
1099	time(&now);
1100
1101	/*
1102	 * Set up the .TARGETS variable to contain the list of targets to be
1103	 * created. If none specified, make the variable empty -- the parser
1104	 * will fill the thing in with the default or .MAIN target.
1105	 */
1106	if (Lst_IsEmpty(&create)) {
1107		Var_SetGlobal(".TARGETS", "");
1108	} else {
1109		LstNode *ln;
1110
1111		for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) {
1112			char *name = Lst_Datum(ln);
1113
1114			Var_Append(".TARGETS", name, VAR_GLOBAL);
1115		}
1116	}
1117
1118
1119	/*
1120	 * If no user-supplied system path was given (through the -m option)
1121	 * add the directories from the DEFSYSPATH (more than one may be given
1122	 * as dir1:...:dirn) to the system include path.
1123	 */
1124	if (TAILQ_EMPTY(&sysIncPath)) {
1125		char defsyspath[] = PATH_DEFSYSPATH;
1126		char *syspath = getenv("MAKESYSPATH");
1127
1128		/*
1129		 * If no user-supplied system path was given (thru -m option)
1130		 * add the directories from the DEFSYSPATH (more than one may
1131		 * be given as dir1:...:dirn) to the system include path.
1132		 */
1133		if (syspath == NULL || *syspath == '\0')
1134			syspath = defsyspath;
1135		else
1136			syspath = estrdup(syspath);
1137
1138		for (start = syspath; *start != '\0'; start = cp) {
1139			for (cp = start; *cp != '\0' && *cp != ':'; cp++)
1140				continue;
1141			if (*cp == ':') {
1142				*cp++ = '\0';
1143			}
1144			/* look for magic parent directory search string */
1145			if (strncmp(".../", start, 4) == 0) {
1146				if (Dir_FindHereOrAbove(curdir, start + 4,
1147				    found_dir, sizeof(found_dir))) {
1148					Path_AddDir(&sysIncPath, found_dir);
1149				}
1150			} else {
1151				Path_AddDir(&sysIncPath, start);
1152			}
1153		}
1154		if (syspath != defsyspath)
1155			free(syspath);
1156	}
1157
1158	/*
1159	 * Read in the built-in rules first, followed by the specified
1160	 * makefile, if it was (makefile != (char *) NULL), or the default
1161	 * Makefile and makefile, in that order, if it wasn't.
1162	 */
1163	if (!noBuiltins) {
1164		/* Path of sys.mk */
1165		Lst sysMkPath = Lst_Initializer(sysMkPath);
1166		LstNode *ln;
1167		char	defsysmk[] = PATH_DEFSYSMK;
1168
1169		Path_Expand(defsysmk, &sysIncPath, &sysMkPath);
1170		if (Lst_IsEmpty(&sysMkPath))
1171			Fatal("make: no system rules (%s).", PATH_DEFSYSMK);
1172		LST_FOREACH(ln, &sysMkPath) {
1173			if (!ReadMakefile(Lst_Datum(ln)))
1174				break;
1175		}
1176		if (ln != NULL)
1177			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
1178		Lst_Destroy(&sysMkPath, free);
1179	}
1180
1181	if (!Lst_IsEmpty(&makefiles)) {
1182		LstNode *ln;
1183
1184		LST_FOREACH(ln, &makefiles) {
1185			if (!TryReadMakefile(Lst_Datum(ln)))
1186				break;
1187		}
1188		if (ln != NULL)
1189			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
1190	} else if (!TryReadMakefile("BSDmakefile"))
1191	    if (!TryReadMakefile("makefile"))
1192		TryReadMakefile("Makefile");
1193
1194	ReadMakefile(".depend");
1195
1196	/* Install all the flags into the MAKEFLAGS envariable. */
1197	if (((p = Var_Value(".MAKEFLAGS", VAR_GLOBAL)) != NULL) && *p)
1198		setenv("MAKEFLAGS", p, 1);
1199	else
1200		setenv("MAKEFLAGS", "", 1);
1201
1202	/*
1203	 * For compatibility, look at the directories in the VPATH variable
1204	 * and add them to the search path, if the variable is defined. The
1205	 * variable's value is in the same format as the PATH envariable, i.e.
1206	 * <directory>:<directory>:<directory>...
1207	 */
1208	if (Var_Exists("VPATH", VAR_CMD)) {
1209		/*
1210		 * GCC stores string constants in read-only memory, but
1211		 * Var_Subst will want to write this thing, so store it
1212		 * in an array
1213		 */
1214		static char VPATH[] = "${VPATH}";
1215		Buffer	*buf;
1216		char	*vpath;
1217		char	*ptr;
1218		char	savec;
1219
1220		buf = Var_Subst(VPATH, VAR_CMD, FALSE);
1221
1222		vpath = Buf_Data(buf);
1223		do {
1224			/* skip to end of directory */
1225			for (ptr = vpath; *ptr != ':' && *ptr != '\0'; ptr++)
1226				;
1227
1228			/* Save terminator character so know when to stop */
1229			savec = *ptr;
1230			*ptr = '\0';
1231
1232			/* Add directory to search path */
1233			Path_AddDir(&dirSearchPath, vpath);
1234
1235			vpath = ptr + 1;
1236		} while (savec != '\0');
1237
1238		Buf_Destroy(buf, TRUE);
1239	}
1240
1241	/*
1242	 * Now that all search paths have been read for suffixes et al, it's
1243	 * time to add the default search path to their lists...
1244	 */
1245	Suff_DoPaths();
1246
1247	/* print the initial graph, if the user requested it */
1248	if (DEBUG(GRAPH1))
1249		Targ_PrintGraph(1);
1250
1251	/* print the values of any variables requested by the user */
1252	if (Lst_IsEmpty(&variables) && !printGraphOnly) {
1253		/*
1254		 * Since the user has not requested that any variables
1255		 * be printed, we can build targets.
1256		 *
1257		 * Have read the entire graph and need to make a list of targets
1258		 * to create. If none was given on the command line, we consult
1259		 * the parsing module to find the main target(s) to create.
1260		 */
1261		Lst targs = Lst_Initializer(targs);
1262
1263		if (!is_posix && mfAutoDeps) {
1264			/*
1265			 * Check if any of the makefiles are out-of-date.
1266			 */
1267			Remake_Makefiles();
1268		}
1269
1270		if (Lst_IsEmpty(&create))
1271			Parse_MainName(&targs);
1272		else
1273			Targ_FindList(&targs, &create, TARG_CREATE);
1274
1275		if (compatMake) {
1276			/*
1277			 * Compat_Init will take care of creating
1278			 * all the targets as well as initializing
1279			 * the module.
1280			 */
1281			Compat_Run(&targs);
1282			outOfDate = 0;
1283		} else {
1284			/*
1285			 * Initialize job module before traversing
1286			 * the graph, now that any .BEGIN and .END
1287			 * targets have been read.  This is done
1288			 * only if the -q flag wasn't given (to
1289			 * prevent the .BEGIN from being executed
1290			 * should it exist).
1291			 */
1292			if (!queryFlag) {
1293				Job_Init(jobLimit);
1294				jobsRunning = TRUE;
1295			}
1296
1297			/* Traverse the graph, checking on all the targets */
1298			outOfDate = Make_Run(&targs);
1299		}
1300		Lst_Destroy(&targs, NOFREE);
1301
1302	} else {
1303		Var_Print(&variables, expandVars);
1304	}
1305
1306	Lst_Destroy(&variables, free);
1307	Lst_Destroy(&makefiles, free);
1308	Lst_Destroy(&source_makefiles, free);
1309	Lst_Destroy(&create, free);
1310
1311	/* print the graph now it's been processed if the user requested it */
1312	if (DEBUG(GRAPH2))
1313		Targ_PrintGraph(2);
1314
1315	if (queryFlag)
1316		return (outOfDate);
1317
1318	if (makeErrors != 0)
1319		Finish(makeErrors);
1320
1321	return (0);
1322}
1323