main.c revision 176842 
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 176842 2008-03-05 20:24:38Z yar $");
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/sysctl.h>
67#include <sys/time.h>
68#include <sys/queue.h>
69#include <sys/resource.h>
70#include <sys/utsname.h>
71#include <sys/wait.h>
72#include <err.h>
73#include <errno.h>
74#include <stdlib.h>
75#include <string.h>
76#include <unistd.h>
77
78#include "arch.h"
79#include "buf.h"
80#include "config.h"
81#include "dir.h"
82#include "globals.h"
83#include "GNode.h"
84#include "job.h"
85#include "make.h"
86#include "parse.h"
87#include "pathnames.h"
88#include "shell.h"
89#include "str.h"
90#include "suff.h"
91#include "targ.h"
92#include "util.h"
93#include "var.h"
94
95extern char **environ;	/* XXX what header declares this variable? */
96
97#define	WANT_ENV_MKLVL	1
98#define	MKLVL_MAXVAL	500
99#define	MKLVL_ENVVAR	"__MKLVL__"
100
101/* ordered list of makefiles to read */
102static Lst makefiles = Lst_Initializer(makefiles);
103
104/* ordered list of source makefiles */
105static Lst source_makefiles = Lst_Initializer(source_makefiles);
106
107/* list of variables to print */
108static Lst variables = Lst_Initializer(variables);
109
110static Boolean	expandVars;	/* fully expand printed variables */
111static Boolean	noBuiltins;	/* -r flag */
112static Boolean	forceJobs;	/* -j argument given */
113static char	*curdir;	/* startup directory */
114static char	*objdir;	/* where we chdir'ed to */
115static char	**save_argv;	/* saved argv */
116static char	*save_makeflags;/* saved MAKEFLAGS */
117
118/* (-E) vars to override from env */
119Lst envFirstVars = Lst_Initializer(envFirstVars);
120
121/* Targets to be made */
122Lst create = Lst_Initializer(create);
123
124Boolean		allPrecious;	/* .PRECIOUS given on line by itself */
125Boolean		is_posix;	/* .POSIX target seen */
126Boolean		beSilent;	/* -s flag */
127Boolean		beVerbose;	/* -v flag */
128Boolean		compatMake;	/* -B argument */
129int		debug;		/* -d flag */
130Boolean		ignoreErrors;	/* -i flag */
131int		jobLimit;	/* -j argument */
132Boolean		jobsRunning;	/* TRUE if the jobs might be running */
133Boolean		keepgoing;	/* -k flag */
134Boolean		noExecute;	/* -n flag */
135Boolean		queryFlag;	/* -q flag */
136Boolean		touchFlag;	/* -t flag */
137Boolean		usePipes;	/* !-P flag */
138uint32_t	warn_cmd;	/* command line warning flags */
139uint32_t	warn_flags;	/* actual warning flags */
140uint32_t	warn_nocmd;	/* command line no-warning flags */
141
142time_t		now;		/* Time at start of make */
143struct GNode	*DEFAULT;	/* .DEFAULT node */
144
145/**
146 * Exit with usage message.
147 */
148static void
149usage(void)
150{
151	fprintf(stderr,
152	    "usage: make [-BPSXeiknqrstv] [-C directory] [-D variable]\n"
153	    "\t[-d flags] [-E variable] [-f makefile] [-I directory]\n"
154	    "\t[-j max_jobs] [-m directory] [-V variable]\n"
155	    "\t[variable=value] [target ...]\n");
156	exit(2);
157}
158
159/**
160 * MFLAGS_append
161 *	Append a flag with an optional argument to MAKEFLAGS and MFLAGS
162 */
163static void
164MFLAGS_append(const char *flag, char *arg)
165{
166	char *str;
167
168	Var_Append(".MAKEFLAGS", flag, VAR_GLOBAL);
169	if (arg != NULL) {
170		str = MAKEFLAGS_quote(arg);
171		Var_Append(".MAKEFLAGS", str, VAR_GLOBAL);
172		free(str);
173	}
174
175	Var_Append("MFLAGS", flag, VAR_GLOBAL);
176	if (arg != NULL) {
177		str = MAKEFLAGS_quote(arg);
178		Var_Append("MFLAGS", str, VAR_GLOBAL);
179		free(str);
180	}
181}
182
183/**
184 * Main_ParseWarn
185 *
186 *	Handle argument to warning option.
187 */
188int
189Main_ParseWarn(const char *arg, int iscmd)
190{
191	int i, neg;
192
193	static const struct {
194		const char	*option;
195		uint32_t	flag;
196	} options[] = {
197		{ "dirsyntax",	WARN_DIRSYNTAX },
198		{ NULL,		0 }
199	};
200
201	neg = 0;
202	if (arg[0] == 'n' && arg[1] == 'o') {
203		neg = 1;
204		arg += 2;
205	}
206
207	for (i = 0; options[i].option != NULL; i++)
208		if (strcmp(arg, options[i].option) == 0)
209			break;
210
211	if (options[i].option == NULL)
212		/* unknown option */
213		return (-1);
214
215	if (iscmd) {
216		if (!neg) {
217			warn_cmd |= options[i].flag;
218			warn_nocmd &= ~options[i].flag;
219			warn_flags |= options[i].flag;
220		} else {
221			warn_nocmd |= options[i].flag;
222			warn_cmd &= ~options[i].flag;
223			warn_flags &= ~options[i].flag;
224		}
225	} else {
226		if (!neg) {
227			warn_flags |= (options[i].flag & ~warn_nocmd);
228		} else {
229			warn_flags &= ~(options[i].flag | warn_cmd);
230		}
231	}
232	return (0);
233}
234
235/**
236 * Open and parse the given makefile.
237 *
238 * Results:
239 *	TRUE if ok. FALSE if couldn't open file.
240 */
241static Boolean
242ReadMakefile(const char p[])
243{
244	char *fname, *fnamesave;	/* makefile to read */
245	FILE *stream;
246	char *name, path[MAXPATHLEN];
247	char *MAKEFILE;
248	int setMAKEFILE;
249
250	/* XXX - remove this once constification is done */
251	fnamesave = fname = estrdup(p);
252
253	if (!strcmp(fname, "-")) {
254		Parse_File("(stdin)", stdin);
255		Var_SetGlobal("MAKEFILE", "");
256	} else {
257		setMAKEFILE = strcmp(fname, ".depend");
258
259		/* if we've chdir'd, rebuild the path name */
260		if (curdir != objdir && *fname != '/') {
261			snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
262			/*
263			 * XXX The realpath stuff breaks relative includes
264			 * XXX in some cases.   The problem likely is in
265			 * XXX parse.c where it does special things in
266			 * XXX ParseDoInclude if the file is relateive
267			 * XXX or absolute and not a system file.  There
268			 * XXX it assumes that if the current file that's
269			 * XXX being included is absolute, that any files
270			 * XXX that it includes shouldn't do the -I path
271			 * XXX stuff, which is inconsistant with historical
272			 * XXX behavior.  However, I can't pentrate the mists
273			 * XXX further, so I'm putting this workaround in
274			 * XXX here until such time as the underlying bug
275			 * XXX can be fixed.
276			 */
277#if THIS_BREAKS_THINGS
278			if (realpath(path, path) != NULL &&
279			    (stream = fopen(path, "r")) != NULL) {
280				MAKEFILE = fname;
281				fname = path;
282				goto found;
283			}
284		} else if (realpath(fname, path) != NULL) {
285			MAKEFILE = fname;
286			fname = path;
287			if ((stream = fopen(fname, "r")) != NULL)
288				goto found;
289		}
290#else
291			if ((stream = fopen(path, "r")) != NULL) {
292				MAKEFILE = fname;
293				fname = path;
294				goto found;
295			}
296		} else {
297			MAKEFILE = fname;
298			if ((stream = fopen(fname, "r")) != NULL)
299				goto found;
300		}
301#endif
302		/* look in -I and system include directories. */
303		name = Path_FindFile(fname, &parseIncPath);
304		if (!name)
305			name = Path_FindFile(fname, &sysIncPath);
306		if (!name || !(stream = fopen(name, "r"))) {
307			free(fnamesave);
308			return (FALSE);
309		}
310		MAKEFILE = fname = name;
311		/*
312		 * set the MAKEFILE variable desired by System V fans -- the
313		 * placement of the setting here means it gets set to the last
314		 * makefile specified, as it is set by SysV make.
315		 */
316found:
317		if (setMAKEFILE)
318			Var_SetGlobal("MAKEFILE", MAKEFILE);
319		Parse_File(fname, stream);
320	}
321	free(fnamesave);
322	return (TRUE);
323}
324
325/**
326 * Open and parse the given makefile.
327 * If open is successful add it to the list of makefiles.
328 *
329 * Results:
330 *	TRUE if ok. FALSE if couldn't open file.
331 */
332static Boolean
333TryReadMakefile(const char p[])
334{
335	char *data;
336	LstNode *last = Lst_Last(&source_makefiles);
337
338	if (!ReadMakefile(p))
339		return (FALSE);
340
341	data = estrdup(p);
342	if (last == NULL) {
343		LstNode *first = Lst_First(&source_makefiles);
344		Lst_Insert(&source_makefiles, first, data);
345	} else
346		Lst_Append(&source_makefiles, last, estrdup(p));
347	return (TRUE);
348}
349
350/**
351 * MainParseArgs
352 *	Parse a given argument vector. Called from main() and from
353 *	Main_ParseArgLine() when the .MAKEFLAGS target is used.
354 *
355 *	XXX: Deal with command line overriding .MAKEFLAGS in makefile
356 *
357 * Side Effects:
358 *	Various global and local flags will be set depending on the flags
359 *	given
360 */
361static void
362MainParseArgs(int argc, char **argv)
363{
364	int c;
365	Boolean	found_dd = FALSE;
366
367rearg:
368	optind = 1;	/* since we're called more than once */
369	optreset = 1;
370#define OPTFLAGS "ABC:D:E:I:PSV:Xd:ef:ij:km:nqrstvx:"
371	for (;;) {
372		if ((optind < argc) && strcmp(argv[optind], "--") == 0) {
373			found_dd = TRUE;
374		}
375		if ((c = getopt(argc, argv, OPTFLAGS)) == -1) {
376			break;
377		}
378		switch(c) {
379
380		case 'A':
381			arch_fatal = FALSE;
382			MFLAGS_append("-A", NULL);
383			break;
384		case 'C':
385			if (chdir(optarg) == -1)
386				err(1, "chdir %s", optarg);
387			break;
388		case 'D':
389			Var_SetGlobal(optarg, "1");
390			MFLAGS_append("-D", optarg);
391			break;
392		case 'I':
393			Parse_AddIncludeDir(optarg);
394			MFLAGS_append("-I", optarg);
395			break;
396		case 'V':
397			Lst_AtEnd(&variables, estrdup(optarg));
398			MFLAGS_append("-V", optarg);
399			break;
400		case 'X':
401			expandVars = FALSE;
402			break;
403		case 'B':
404			compatMake = TRUE;
405			MFLAGS_append("-B", NULL);
406			unsetenv("MAKE_JOBS_FIFO");
407			break;
408		case 'P':
409			usePipes = FALSE;
410			MFLAGS_append("-P", NULL);
411			break;
412		case 'S':
413			keepgoing = FALSE;
414			MFLAGS_append("-S", NULL);
415			break;
416		case 'd': {
417			char *modules = optarg;
418
419			for (; *modules; ++modules)
420				switch (*modules) {
421				case 'A':
422					debug = ~0;
423					break;
424				case 'a':
425					debug |= DEBUG_ARCH;
426					break;
427				case 'c':
428					debug |= DEBUG_COND;
429					break;
430				case 'd':
431					debug |= DEBUG_DIR;
432					break;
433				case 'f':
434					debug |= DEBUG_FOR;
435					break;
436				case 'g':
437					if (modules[1] == '1') {
438						debug |= DEBUG_GRAPH1;
439						++modules;
440					}
441					else if (modules[1] == '2') {
442						debug |= DEBUG_GRAPH2;
443						++modules;
444					}
445					break;
446				case 'j':
447					debug |= DEBUG_JOB;
448					break;
449				case 'l':
450					debug |= DEBUG_LOUD;
451					break;
452				case 'm':
453					debug |= DEBUG_MAKE;
454					break;
455				case 's':
456					debug |= DEBUG_SUFF;
457					break;
458				case 't':
459					debug |= DEBUG_TARG;
460					break;
461				case 'v':
462					debug |= DEBUG_VAR;
463					break;
464				default:
465					warnx("illegal argument to d option "
466					    "-- %c", *modules);
467					usage();
468				}
469			MFLAGS_append("-d", optarg);
470			break;
471		}
472		case 'E':
473			Lst_AtEnd(&envFirstVars, estrdup(optarg));
474			MFLAGS_append("-E", optarg);
475			break;
476		case 'e':
477			checkEnvFirst = TRUE;
478			MFLAGS_append("-e", NULL);
479			break;
480		case 'f':
481			Lst_AtEnd(&makefiles, estrdup(optarg));
482			break;
483		case 'i':
484			ignoreErrors = TRUE;
485			MFLAGS_append("-i", NULL);
486			break;
487		case 'j': {
488			char *endptr;
489
490			forceJobs = TRUE;
491			jobLimit = strtol(optarg, &endptr, 10);
492			if (jobLimit <= 0 || *endptr != '\0') {
493				warnx("illegal number, -j argument -- %s",
494				    optarg);
495				usage();
496			}
497			MFLAGS_append("-j", optarg);
498			break;
499		}
500		case 'k':
501			keepgoing = TRUE;
502			MFLAGS_append("-k", NULL);
503			break;
504		case 'm':
505			Path_AddDir(&sysIncPath, optarg);
506			MFLAGS_append("-m", optarg);
507			break;
508		case 'n':
509			noExecute = TRUE;
510			MFLAGS_append("-n", NULL);
511			break;
512		case 'q':
513			queryFlag = TRUE;
514			/* Kind of nonsensical, wot? */
515			MFLAGS_append("-q", NULL);
516			break;
517		case 'r':
518			noBuiltins = TRUE;
519			MFLAGS_append("-r", NULL);
520			break;
521		case 's':
522			beSilent = TRUE;
523			MFLAGS_append("-s", NULL);
524			break;
525		case 't':
526			touchFlag = TRUE;
527			MFLAGS_append("-t", NULL);
528			break;
529		case 'v':
530			beVerbose = TRUE;
531			MFLAGS_append("-v", NULL);
532			break;
533		case 'x':
534			if (Main_ParseWarn(optarg, 1) != -1)
535				MFLAGS_append("-x", optarg);
536			break;
537
538		default:
539		case '?':
540			usage();
541		}
542	}
543	argv += optind;
544	argc -= optind;
545
546	oldVars = TRUE;
547
548	/*
549	 * Parse the rest of the arguments.
550	 *	o Check for variable assignments and perform them if so.
551	 *	o Check for more flags and restart getopt if so.
552	 *	o Anything else is taken to be a target and added
553	 *	  to the end of the "create" list.
554	 */
555	for (; *argv != NULL; ++argv, --argc) {
556		if (Parse_IsVar(*argv)) {
557			char *ptr = MAKEFLAGS_quote(*argv);
558			char *v = estrdup(*argv);
559
560			Var_Append(".MAKEFLAGS", ptr, VAR_GLOBAL);
561			Parse_DoVar(v, VAR_CMD);
562			free(ptr);
563			free(v);
564
565		} else if ((*argv)[0] == '-') {
566			if ((*argv)[1] == '\0') {
567				/*
568				 * (*argv) is a single dash, so we
569				 * just ignore it.
570				 */
571			} else if (found_dd) {
572				/*
573				 * Double dash has been found, ignore
574				 * any more options.  But what do we do
575				 * with it?  For now treat it like a target.
576				 */
577				Lst_AtEnd(&create, estrdup(*argv));
578			} else {
579				/*
580				 * (*argv) is a -flag, so backup argv and
581				 * argc.  getopt() expects options to start
582				 * in the 2nd position.
583				 */
584				argc++;
585				argv--;
586				goto rearg;
587			}
588
589		} else if ((*argv)[0] == '\0') {
590			Punt("illegal (null) argument.");
591
592		} else {
593			Lst_AtEnd(&create, estrdup(*argv));
594		}
595	}
596}
597
598/**
599 * Main_ParseArgLine
600 *	Used by the parse module when a .MFLAGS or .MAKEFLAGS target
601 *	is encountered and by main() when reading the .MAKEFLAGS envariable.
602 *	Takes a line of arguments and breaks it into its
603 *	component words and passes those words and the number of them to the
604 *	MainParseArgs function.
605 *	The line should have all its leading whitespace removed.
606 *
607 * Side Effects:
608 *	Only those that come from the various arguments.
609 */
610void
611Main_ParseArgLine(char *line, int mflags)
612{
613	ArgArray	aa;
614
615	if (line == NULL)
616		return;
617	for (; *line == ' '; ++line)
618		continue;
619	if (!*line)
620		return;
621
622	if (mflags)
623		MAKEFLAGS_break(&aa, line);
624	else
625		brk_string(&aa, line, TRUE);
626
627	MainParseArgs(aa.argc, aa.argv);
628	ArgArray_Done(&aa);
629}
630
631static char *
632chdir_verify_path(const char *path, char *obpath)
633{
634	struct stat sb;
635
636	if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
637		if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
638			warn("warning: %s", path);
639			return (NULL);
640		}
641		return (obpath);
642	}
643
644	return (NULL);
645}
646
647/**
648 * In lieu of a good way to prevent every possible looping in make(1), stop
649 * there from being more than MKLVL_MAXVAL processes forked by make(1), to
650 * prevent a forkbomb from happening, in a dumb and mechanical way.
651 *
652 * Side Effects:
653 *	Creates or modifies enviornment variable MKLVL_ENVVAR via setenv().
654 */
655static void
656check_make_level(void)
657{
658#ifdef WANT_ENV_MKLVL
659	char	*value = getenv(MKLVL_ENVVAR);
660	int	level = (value == NULL) ? 0 : atoi(value);
661
662	if (level < 0) {
663		errc(2, EAGAIN, "Invalid value for recursion level (%d).",
664		    level);
665	} else if (level > MKLVL_MAXVAL) {
666		errc(2, EAGAIN, "Max recursion level (%d) exceeded.",
667		    MKLVL_MAXVAL);
668	} else {
669		char new_value[32];
670		sprintf(new_value, "%d", level + 1);
671		setenv(MKLVL_ENVVAR, new_value, 1);
672	}
673#endif /* WANT_ENV_MKLVL */
674}
675
676/**
677 * Main_AddSourceMakefile
678 *	Add a file to the list of source makefiles
679 */
680void
681Main_AddSourceMakefile(const char *name)
682{
683
684	Lst_AtEnd(&source_makefiles, estrdup(name));
685}
686
687/**
688 * Remake_Makefiles
689 *	Remake all the makefiles
690 */
691static void
692Remake_Makefiles(void)
693{
694	LstNode *ln;
695	int error_cnt = 0;
696	int remade_cnt = 0;
697
698	Compat_InstallSignalHandlers();
699	if (curdir != objdir) {
700		if (chdir(curdir) < 0)
701			Fatal("Failed to change directory to %s.", curdir);
702	}
703
704	LST_FOREACH(ln, &source_makefiles) {
705		LstNode *ln2;
706		struct GNode *gn;
707		const char *name = Lst_Datum(ln);
708		Boolean saveTouchFlag = touchFlag;
709		Boolean saveQueryFlag = queryFlag;
710		Boolean saveNoExecute = noExecute;
711		int mtime;
712
713		/*
714		 * Create node
715		 */
716		gn = Targ_FindNode(name, TARG_CREATE);
717		DEBUGF(MAKE, ("Checking %s...", gn->name));
718		Suff_FindDeps(gn);
719
720		/*
721		 * ! dependencies as well as
722		 * dependencies with .FORCE, .EXEC and .PHONY attributes
723		 * are skipped to prevent infinite loops
724		 */
725		if (gn->type & (OP_FORCE | OP_EXEC | OP_PHONY)) {
726			DEBUGF(MAKE, ("skipping (force, exec or phony).\n",
727			    gn->name));
728			continue;
729		}
730
731		/*
732		 * Skip :: targets that have commands and no children
733		 * because such targets are always out-of-date
734		 */
735		if ((gn->type & OP_DOUBLEDEP) &&
736		    !Lst_IsEmpty(&gn->commands) &&
737		    Lst_IsEmpty(&gn->children)) {
738			DEBUGF(MAKE, ("skipping (doubledep, no sources "
739			    "and has commands).\n"));
740			continue;
741		}
742
743		/*
744		 * Skip targets without sources and without commands
745		 */
746		if (Lst_IsEmpty(&gn->commands) &&
747		    Lst_IsEmpty(&gn->children)) {
748			DEBUGF(MAKE,
749			    ("skipping (no sources and no commands).\n"));
750			continue;
751		}
752
753		DEBUGF(MAKE, ("\n"));
754
755		/*
756		 * -t, -q and -n has no effect unless the makefile is
757		 * specified as one of the targets explicitly in the
758		 * command line
759		 */
760		LST_FOREACH(ln2, &create) {
761			if (!strcmp(gn->name, Lst_Datum(ln2))) {
762				/* found as a target */
763				break;
764			}
765		}
766		if (ln2 == NULL) {
767			touchFlag = FALSE;
768			queryFlag = FALSE;
769			noExecute = FALSE;
770		}
771
772		/*
773		 * Check and remake the makefile
774		 */
775		mtime = Dir_MTime(gn);
776		Compat_Make(gn, gn);
777
778		/*
779		 * Restore -t, -q and -n behaviour
780		 */
781		touchFlag = saveTouchFlag;
782		queryFlag = saveQueryFlag;
783		noExecute = saveNoExecute;
784
785		/*
786		 * Compat_Make will leave the 'made' field of gn
787		 * in one of the following states:
788		 *	UPTODATE  gn was already up-to-date
789		 *	MADE	  gn was recreated successfully
790		 *	ERROR	  An error occurred while gn was being created
791		 *	ABORTED	  gn was not remade because one of its inferiors
792		 *		  could not be made due to errors.
793		 */
794		if (gn->made == MADE) {
795			if (mtime != Dir_MTime(gn)) {
796				DEBUGF(MAKE,
797				    ("%s updated (%d -> %d).\n",
798				     gn->name, mtime, gn->mtime));
799				remade_cnt++;
800			} else {
801				DEBUGF(MAKE,
802				    ("%s not updated: skipping restart.\n",
803				     gn->name));
804			}
805		} else if (gn->made == ERROR)
806			error_cnt++;
807		else if (gn->made == ABORTED) {
808			printf("`%s' not remade because of errors.\n",
809			    gn->name);
810			error_cnt++;
811		} else if (gn->made == UPTODATE) {
812			Lst examine;
813
814			Lst_Init(&examine);
815			Lst_EnQueue(&examine, gn);
816			while (!Lst_IsEmpty(&examine)) {
817				LstNode	*eln;
818				GNode *egn = Lst_DeQueue(&examine);
819
820				egn->make = FALSE;
821				LST_FOREACH(eln, &egn->children) {
822					GNode *cgn = Lst_Datum(eln);
823
824					Lst_EnQueue(&examine, cgn);
825				}
826			}
827		}
828	}
829
830	if (error_cnt > 0)
831		Fatal("Failed to remake Makefiles.");
832	if (remade_cnt > 0) {
833		DEBUGF(MAKE, ("Restarting `%s'.\n", save_argv[0]));
834
835		/*
836		 * Some of makefiles were remade -- restart from clean state
837		 */
838		if (save_makeflags != NULL)
839			setenv("MAKEFLAGS", save_makeflags, 1);
840		else
841			unsetenv("MAKEFLAGS");
842		if (execvp(save_argv[0], save_argv) < 0) {
843			Fatal("Can't restart `%s': %s.",
844			    save_argv[0], strerror(errno));
845		}
846	}
847
848	if (curdir != objdir) {
849		if (chdir(objdir) < 0)
850			Fatal("Failed to change directory to %s.", objdir);
851	}
852}
853
854/**
855 * main
856 *	The main function, for obvious reasons. Initializes variables
857 *	and a few modules, then parses the arguments give it in the
858 *	environment and on the command line. Reads the system makefile
859 *	followed by either Makefile, makefile or the file given by the
860 *	-f argument. Sets the .MAKEFLAGS PMake variable based on all the
861 *	flags it has received by then uses either the Make or the Compat
862 *	module to create the initial list of targets.
863 *
864 * Results:
865 *	If -q was given, exits -1 if anything was out-of-date. Else it exits
866 *	0.
867 *
868 * Side Effects:
869 *	The program exits when done. Targets are created. etc. etc. etc.
870 */
871int
872main(int argc, char **argv)
873{
874	const char *machine;
875	const char *machine_arch;
876	const char *machine_cpu;
877	Boolean outOfDate = TRUE;	/* FALSE if all targets up to date */
878	const char *p;
879	const char *pathp;
880	const char *path;
881	char mdpath[MAXPATHLEN];
882	char obpath[MAXPATHLEN];
883	char cdpath[MAXPATHLEN];
884	char *cp = NULL, *start;
885
886	save_argv = argv;
887	save_makeflags = getenv("MAKEFLAGS");
888	if (save_makeflags != NULL)
889		save_makeflags = estrdup(save_makeflags);
890
891	/*
892	 * Initialize file global variables.
893	 */
894	expandVars = TRUE;
895	noBuiltins = FALSE;		/* Read the built-in rules */
896	forceJobs = FALSE;		/* No -j flag */
897	curdir = cdpath;
898
899	/*
900	 * Initialize program global variables.
901	 */
902	beSilent = FALSE;		/* Print commands as executed */
903	ignoreErrors = FALSE;		/* Pay attention to non-zero returns */
904	noExecute = FALSE;		/* Execute all commands */
905	keepgoing = FALSE;		/* Stop on error */
906	allPrecious = FALSE;		/* Remove targets when interrupted */
907	queryFlag = FALSE;		/* This is not just a check-run */
908	touchFlag = FALSE;		/* Actually update targets */
909	usePipes = TRUE;		/* Catch child output in pipes */
910	debug = 0;			/* No debug verbosity, please. */
911	jobsRunning = FALSE;
912
913	jobLimit = DEFMAXJOBS;
914	compatMake = FALSE;		/* No compat mode */
915
916	check_make_level();
917
918#ifdef RLIMIT_NOFILE
919	/*
920	 * get rid of resource limit on file descriptors
921	 */
922	{
923		struct rlimit rl;
924		if (getrlimit(RLIMIT_NOFILE, &rl) == -1) {
925			err(2, "getrlimit");
926		}
927		rl.rlim_cur = rl.rlim_max;
928		if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
929			err(2, "setrlimit");
930		}
931	}
932#endif
933
934	/*
935	 * Prior to 7.0, FreeBSD/pc98 kernel used to set the
936	 * utsname.machine to "i386", and MACHINE was defined as
937	 * "i386", so it could not be distinguished from FreeBSD/i386.
938	 * Therefore, we had to check machine.ispc98 and adjust the
939	 * MACHINE variable.  NOTE: The code is still here to be able
940	 * to compile new make binary on old FreeBSD/pc98 systems, and
941	 * have the MACHINE variable set properly.
942	 */
943	if ((machine = getenv("MACHINE")) == NULL) {
944		int	ispc98;
945		size_t	len;
946
947		len = sizeof(ispc98);
948		if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
949			if (ispc98)
950				machine = "pc98";
951		}
952	}
953
954	/*
955	 * Get the name of this type of MACHINE from utsname
956	 * so we can share an executable for similar machines.
957	 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
958	 *
959	 * Note that both MACHINE and MACHINE_ARCH are decided at
960	 * run-time.
961	 */
962	if (machine == NULL) {
963		static struct utsname utsname;
964
965		if (uname(&utsname) == -1)
966			err(2, "uname");
967		machine = utsname.machine;
968	}
969
970	if ((machine_arch = getenv("MACHINE_ARCH")) == NULL) {
971#ifdef MACHINE_ARCH
972		machine_arch = MACHINE_ARCH;
973#else
974		machine_arch = "unknown";
975#endif
976	}
977
978	/*
979	 * Set machine_cpu to the minumum supported CPU revision based
980	 * on the target architecture, if not already set.
981	 */
982	if ((machine_cpu = getenv("MACHINE_CPU")) == NULL) {
983		if (!strcmp(machine_arch, "i386"))
984			machine_cpu = "i386";
985		else if (!strcmp(machine_arch, "alpha"))
986			machine_cpu = "ev4";
987		else
988			machine_cpu = "unknown";
989	}
990
991	/*
992	 * Initialize the parsing, directory and variable modules to prepare
993	 * for the reading of inclusion paths and variable settings on the
994	 * command line
995	 */
996	Proc_Init();
997
998	Dir_Init();		/* Initialize directory structures so -I flags
999				 * can be processed correctly */
1000	Var_Init(environ);	/* As well as the lists of variables for
1001				 * parsing arguments */
1002
1003	/*
1004	 * Initialize the Shell so that we have a shell for != assignments
1005	 * on the command line.
1006	 */
1007	Shell_Init();
1008
1009	/*
1010	 * Initialize various variables.
1011	 *	MAKE also gets this name, for compatibility
1012	 *	.MAKEFLAGS gets set to the empty string just in case.
1013	 *	MFLAGS also gets initialized empty, for compatibility.
1014	 */
1015	Var_SetGlobal("MAKE", argv[0]);
1016	Var_SetGlobal(".MAKEFLAGS", "");
1017	Var_SetGlobal("MFLAGS", "");
1018	Var_SetGlobal("MACHINE", machine);
1019	Var_SetGlobal("MACHINE_ARCH", machine_arch);
1020	Var_SetGlobal("MACHINE_CPU", machine_cpu);
1021#ifdef MAKE_VERSION
1022	Var_SetGlobal("MAKE_VERSION", MAKE_VERSION);
1023#endif
1024
1025	/*
1026	 * First snag things out of the MAKEFLAGS environment
1027	 * variable.  Then parse the command line arguments.
1028	 */
1029	Main_ParseArgLine(getenv("MAKEFLAGS"), 1);
1030
1031	MainParseArgs(argc, argv);
1032
1033	/*
1034	 * Find where we are...
1035	 */
1036	if (getcwd(curdir, MAXPATHLEN) == NULL)
1037		err(2, NULL);
1038
1039	{
1040	struct stat sa;
1041
1042	if (stat(curdir, &sa) == -1)
1043	    err(2, "%s", curdir);
1044	}
1045
1046	/*
1047	 * The object directory location is determined using the
1048	 * following order of preference:
1049	 *
1050	 *	1. MAKEOBJDIRPREFIX`cwd`
1051	 *	2. MAKEOBJDIR
1052	 *	3. PATH_OBJDIR.${MACHINE}
1053	 *	4. PATH_OBJDIR
1054	 *	5. PATH_OBJDIRPREFIX`cwd`
1055	 *
1056	 * If one of the first two fails, use the current directory.
1057	 * If the remaining three all fail, use the current directory.
1058	 *
1059	 * Once things are initted,
1060	 * have to add the original directory to the search path,
1061	 * and modify the paths for the Makefiles apropriately.  The
1062	 * current directory is also placed as a variable for make scripts.
1063	 */
1064	if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
1065		if (!(path = getenv("MAKEOBJDIR"))) {
1066			path = PATH_OBJDIR;
1067			pathp = PATH_OBJDIRPREFIX;
1068			snprintf(mdpath, MAXPATHLEN, "%s.%s", path, machine);
1069			if (!(objdir = chdir_verify_path(mdpath, obpath)))
1070				if (!(objdir=chdir_verify_path(path, obpath))) {
1071					snprintf(mdpath, MAXPATHLEN,
1072							"%s%s", pathp, curdir);
1073					if (!(objdir=chdir_verify_path(mdpath,
1074								       obpath)))
1075						objdir = curdir;
1076				}
1077		}
1078		else if (!(objdir = chdir_verify_path(path, obpath)))
1079			objdir = curdir;
1080	}
1081	else {
1082		snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
1083		if (!(objdir = chdir_verify_path(mdpath, obpath)))
1084			objdir = curdir;
1085	}
1086	Dir_InitDot();		/* Initialize the "." directory */
1087	if (objdir != curdir)
1088		Path_AddDir(&dirSearchPath, curdir);
1089	Var_SetGlobal(".ST_EXPORTVAR", "YES");
1090	Var_SetGlobal(".CURDIR", curdir);
1091	Var_SetGlobal(".OBJDIR", objdir);
1092
1093	if (getenv("MAKE_JOBS_FIFO") != NULL)
1094		forceJobs = TRUE;
1095	/*
1096	 * Be compatible if user did not specify -j and did not explicitly
1097	 * turned compatibility on
1098	 */
1099	if (!compatMake && !forceJobs)
1100		compatMake = TRUE;
1101
1102	/*
1103	 * Initialize target and suffix modules in preparation for
1104	 * parsing the makefile(s)
1105	 */
1106	Targ_Init();
1107	Suff_Init();
1108
1109	DEFAULT = NULL;
1110	time(&now);
1111
1112	/*
1113	 * Set up the .TARGETS variable to contain the list of targets to be
1114	 * created. If none specified, make the variable empty -- the parser
1115	 * will fill the thing in with the default or .MAIN target.
1116	 */
1117	if (Lst_IsEmpty(&create)) {
1118		Var_SetGlobal(".TARGETS", "");
1119	} else {
1120		LstNode *ln;
1121
1122		for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) {
1123			char *name = Lst_Datum(ln);
1124
1125			Var_Append(".TARGETS", name, VAR_GLOBAL);
1126		}
1127	}
1128
1129
1130	/*
1131	 * If no user-supplied system path was given (through the -m option)
1132	 * add the directories from the DEFSYSPATH (more than one may be given
1133	 * as dir1:...:dirn) to the system include path.
1134	 */
1135	if (TAILQ_EMPTY(&sysIncPath)) {
1136		char syspath[] = PATH_DEFSYSPATH;
1137
1138		for (start = syspath; *start != '\0'; start = cp) {
1139			for (cp = start; *cp != '\0' && *cp != ':'; cp++)
1140				continue;
1141			if (*cp == '\0') {
1142				Path_AddDir(&sysIncPath, start);
1143			} else {
1144				*cp++ = '\0';
1145				Path_AddDir(&sysIncPath, start);
1146			}
1147		}
1148	}
1149
1150	/*
1151	 * Read in the built-in rules first, followed by the specified
1152	 * makefile, if it was (makefile != (char *) NULL), or the default
1153	 * Makefile and makefile, in that order, if it wasn't.
1154	 */
1155	if (!noBuiltins) {
1156		/* Path of sys.mk */
1157		Lst sysMkPath = Lst_Initializer(sysMkPath);
1158		LstNode *ln;
1159		char	defsysmk[] = PATH_DEFSYSMK;
1160
1161		Path_Expand(defsysmk, &sysIncPath, &sysMkPath);
1162		if (Lst_IsEmpty(&sysMkPath))
1163			Fatal("make: no system rules (%s).", PATH_DEFSYSMK);
1164		LST_FOREACH(ln, &sysMkPath) {
1165			if (!ReadMakefile(Lst_Datum(ln)))
1166				break;
1167		}
1168		if (ln != NULL)
1169			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
1170		Lst_Destroy(&sysMkPath, free);
1171	}
1172
1173	if (!Lst_IsEmpty(&makefiles)) {
1174		LstNode *ln;
1175
1176		LST_FOREACH(ln, &makefiles) {
1177			if (!TryReadMakefile(Lst_Datum(ln)))
1178				break;
1179		}
1180		if (ln != NULL)
1181			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
1182	} else if (!TryReadMakefile("BSDmakefile"))
1183	    if (!TryReadMakefile("makefile"))
1184		TryReadMakefile("Makefile");
1185
1186	ReadMakefile(".depend");
1187
1188	/* Install all the flags into the MAKEFLAGS envariable. */
1189	if (((p = Var_Value(".MAKEFLAGS", VAR_GLOBAL)) != NULL) && *p)
1190		setenv("MAKEFLAGS", p, 1);
1191	else
1192		setenv("MAKEFLAGS", "", 1);
1193
1194	/*
1195	 * For compatibility, look at the directories in the VPATH variable
1196	 * and add them to the search path, if the variable is defined. The
1197	 * variable's value is in the same format as the PATH envariable, i.e.
1198	 * <directory>:<directory>:<directory>...
1199	 */
1200	if (Var_Exists("VPATH", VAR_CMD)) {
1201		/*
1202		 * GCC stores string constants in read-only memory, but
1203		 * Var_Subst will want to write this thing, so store it
1204		 * in an array
1205		 */
1206		static char VPATH[] = "${VPATH}";
1207		Buffer	*buf;
1208		char	*vpath;
1209		char	*ptr;
1210		char	savec;
1211
1212		buf = Var_Subst(VPATH, VAR_CMD, FALSE);
1213
1214		vpath = Buf_Data(buf);
1215		do {
1216			/* skip to end of directory */
1217			for (ptr = vpath; *ptr != ':' && *ptr != '\0'; ptr++)
1218				;
1219
1220			/* Save terminator character so know when to stop */
1221			savec = *ptr;
1222			*ptr = '\0';
1223
1224			/* Add directory to search path */
1225			Path_AddDir(&dirSearchPath, vpath);
1226
1227			vpath = ptr + 1;
1228		} while (savec != '\0');
1229
1230		Buf_Destroy(buf, TRUE);
1231	}
1232
1233	/*
1234	 * Now that all search paths have been read for suffixes et al, it's
1235	 * time to add the default search path to their lists...
1236	 */
1237	Suff_DoPaths();
1238
1239	/* print the initial graph, if the user requested it */
1240	if (DEBUG(GRAPH1))
1241		Targ_PrintGraph(1);
1242
1243	/* print the values of any variables requested by the user */
1244	if (Lst_IsEmpty(&variables)) {
1245		/*
1246		 * Since the user has not requested that any variables
1247		 * be printed, we can build targets.
1248		 *
1249		 * Have read the entire graph and need to make a list of targets
1250		 * to create. If none was given on the command line, we consult
1251		 * the parsing module to find the main target(s) to create.
1252		 */
1253		Lst targs = Lst_Initializer(targs);
1254
1255		if (!is_posix) {
1256			/*
1257			 * Check if any of the makefiles are out-of-date.
1258			 */
1259			Remake_Makefiles();
1260		}
1261
1262		if (Lst_IsEmpty(&create))
1263			Parse_MainName(&targs);
1264		else
1265			Targ_FindList(&targs, &create, TARG_CREATE);
1266
1267		if (compatMake) {
1268			/*
1269			 * Compat_Init will take care of creating
1270			 * all the targets as well as initializing
1271			 * the module.
1272			 */
1273			Compat_Run(&targs);
1274			outOfDate = 0;
1275		} else {
1276			/*
1277			 * Initialize job module before traversing
1278			 * the graph, now that any .BEGIN and .END
1279			 * targets have been read.  This is done
1280			 * only if the -q flag wasn't given (to
1281			 * prevent the .BEGIN from being executed
1282			 * should it exist).
1283			 */
1284			if (!queryFlag) {
1285				Job_Init(jobLimit);
1286				jobsRunning = TRUE;
1287			}
1288
1289			/* Traverse the graph, checking on all the targets */
1290			outOfDate = Make_Run(&targs);
1291		}
1292		Lst_Destroy(&targs, NOFREE);
1293
1294	} else {
1295		Var_Print(&variables, expandVars);
1296	}
1297
1298	Lst_Destroy(&variables, free);
1299	Lst_Destroy(&makefiles, free);
1300	Lst_Destroy(&source_makefiles, free);
1301	Lst_Destroy(&create, free);
1302
1303	/* print the graph now it's been processed if the user requested it */
1304	if (DEBUG(GRAPH2))
1305		Targ_PrintGraph(2);
1306
1307	if (queryFlag && outOfDate)
1308		return (1);
1309	else
1310		return (0);
1311}
1312
1313