main.c revision 146056 
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 146056 2005-05-10 13:45:29Z harti $");
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#ifndef MACHINE
65#include <sys/utsname.h>
66#endif
67#include <sys/param.h>
68#include <sys/stat.h>
69#include <sys/sysctl.h>
70#include <sys/time.h>
71#include <sys/queue.h>
72#include <sys/resource.h>
73#include <sys/wait.h>
74#include <err.h>
75#include <errno.h>
76#include <signal.h>
77#include <stdlib.h>
78#include <string.h>
79#include <unistd.h>
80
81#include "arch.h"
82#include "buf.h"
83#include "config.h"
84#include "dir.h"
85#include "globals.h"
86#include "job.h"
87#include "make.h"
88#include "nonints.h"
89#include "parse.h"
90#include "pathnames.h"
91#include "str.h"
92#include "suff.h"
93#include "targ.h"
94#include "util.h"
95#include "var.h"
96
97#define WANT_ENV_MKLVL	1
98#define	MKLVL_MAXVAL	500
99#define	MKLVL_ENVVAR	"__MKLVL__"
100
101#define	MAKEFLAGS	".MAKEFLAGS"
102
103extern char **environ;	/* XXX what header declares this variable? */
104
105/* Targets to be made */
106Lst create = Lst_Initializer(create);
107
108time_t		now;		/* Time at start of make */
109struct GNode	*DEFAULT;	/* .DEFAULT node */
110Boolean		allPrecious;	/* .PRECIOUS given on line by itself */
111uint32_t	warn_flags;	/* actual warning flags */
112uint32_t	warn_cmd;	/* command line warning flags */
113uint32_t	warn_nocmd;	/* command line no-warning flags */
114
115static Boolean	noBuiltins;	/* -r flag */
116
117/* ordered list of makefiles to read */
118static Lst makefiles = Lst_Initializer(makefiles);
119
120static Boolean	expandVars;	/* fully expand printed variables */
121
122/* list of variables to print */
123static Lst variables = Lst_Initializer(variables);
124
125int		maxJobs;	/* -j argument */
126static Boolean	forceJobs;      /* -j argument given */
127Boolean		compatMake;	/* -B argument */
128Boolean		debug;		/* -d flag */
129Boolean		noExecute;	/* -n flag */
130Boolean		keepgoing;	/* -k flag */
131Boolean		queryFlag;	/* -q flag */
132Boolean		touchFlag;	/* -t flag */
133Boolean		usePipes;	/* !-P flag */
134Boolean		ignoreErrors;	/* -i flag */
135Boolean		beSilent;	/* -s flag */
136Boolean		beVerbose;	/* -v flag */
137Boolean		oldVars;	/* variable substitution style */
138Boolean		checkEnvFirst;	/* -e flag */
139
140/* (-E) vars to override from env */
141Lst envFirstVars = Lst_Initializer(envFirstVars);
142
143Boolean		jobsRunning;	/* TRUE if the jobs might be running */
144
145char		*chdir_verify_path(const char *, char *);
146static int	ReadMakefile(const char *);
147static void	usage(void);
148
149static char	*curdir;	/* startup directory */
150static char	*objdir;	/* where we chdir'ed to */
151
152/**
153 * MFLAGS_append
154 *	Append a flag with an optional argument to MAKEFLAGS and MFLAGS
155 */
156static void
157MFLAGS_append(const char *flag, char *arg)
158{
159	char *str;
160
161	Var_Append(MAKEFLAGS, flag, VAR_GLOBAL);
162	if (arg != NULL) {
163		str = MAKEFLAGS_quote(arg);
164		Var_Append(MAKEFLAGS, str, VAR_GLOBAL);
165		free(str);
166	}
167
168	Var_Append("MFLAGS", flag, VAR_GLOBAL);
169	if (arg != NULL) {
170		str = MAKEFLAGS_quote(arg);
171		Var_Append("MFLAGS", str, VAR_GLOBAL);
172		free(str);
173	}
174}
175
176/**
177 * Main_ParseWarn
178 *
179 *	Handle argument to warning option.
180 */
181int
182Main_ParseWarn(const char *arg, int iscmd)
183{
184	int i, neg;
185
186	static const struct {
187		const char	*option;
188		uint32_t	flag;
189	} options[] = {
190		{ "dirsyntax",	WARN_DIRSYNTAX },
191		{ NULL,		0 }
192	};
193
194	neg = 0;
195	if (arg[0] == 'n' && arg[1] == 'o') {
196		neg = 1;
197		arg += 2;
198	}
199
200	for (i = 0; options[i].option != NULL; i++)
201		if (strcmp(arg, options[i].option) == 0)
202			break;
203
204	if (options[i].option == NULL)
205		/* unknown option */
206		return (-1);
207
208	if (iscmd) {
209		if (!neg) {
210			warn_cmd |= options[i].flag;
211			warn_nocmd &= ~options[i].flag;
212			warn_flags |= options[i].flag;
213		} else {
214			warn_nocmd |= options[i].flag;
215			warn_cmd &= ~options[i].flag;
216			warn_flags &= ~options[i].flag;
217		}
218	} else {
219		if (!neg) {
220			warn_flags |= (options[i].flag & ~warn_nocmd);
221		} else {
222			warn_flags &= ~(options[i].flag | warn_cmd);
223		}
224	}
225	return (0);
226}
227
228/**
229 * MainParseArgs
230 *	Parse a given argument vector. Called from main() and from
231 *	Main_ParseArgLine() when the .MAKEFLAGS target is used.
232 *
233 *	XXX: Deal with command line overriding .MAKEFLAGS in makefile
234 *
235 * Side Effects:
236 *	Various global and local flags will be set depending on the flags
237 *	given
238 */
239static void
240MainParseArgs(int argc, char **argv)
241{
242	int c;
243	Boolean	found_dd = FALSE;
244
245rearg:
246	optind = 1;	/* since we're called more than once */
247	optreset = 1;
248#define OPTFLAGS "ABC:D:E:I:PSV:Xd:ef:ij:km:nqrstvx:"
249	for (;;) {
250		if ((optind < argc) && strcmp(argv[optind], "--") == 0) {
251			found_dd = TRUE;
252		}
253		if ((c = getopt(argc, argv, OPTFLAGS)) == -1) {
254			break;
255		}
256		switch(c) {
257
258		case 'A':
259			arch_fatal = FALSE;
260			MFLAGS_append("-A", NULL);
261			break;
262		case 'C':
263			if (chdir(optarg) == -1)
264				err(1, "chdir %s", optarg);
265			break;
266		case 'D':
267			Var_Set(optarg, "1", VAR_GLOBAL);
268			MFLAGS_append("-D", optarg);
269			break;
270		case 'I':
271			Parse_AddIncludeDir(optarg);
272			MFLAGS_append("-I", optarg);
273			break;
274		case 'V':
275			Lst_AtEnd(&variables, estrdup(optarg));
276			MFLAGS_append("-V", optarg);
277			break;
278		case 'X':
279			expandVars = FALSE;
280			break;
281		case 'B':
282			compatMake = TRUE;
283			MFLAGS_append("-B", NULL);
284			unsetenv("MAKE_JOBS_FIFO");
285			break;
286		case 'P':
287			usePipes = FALSE;
288			MFLAGS_append("-P", NULL);
289			break;
290		case 'S':
291			keepgoing = FALSE;
292			MFLAGS_append("-S", NULL);
293			break;
294		case 'd': {
295			char *modules = optarg;
296
297			for (; *modules; ++modules)
298				switch (*modules) {
299				case 'A':
300					debug = ~0;
301					break;
302				case 'a':
303					debug |= DEBUG_ARCH;
304					break;
305				case 'c':
306					debug |= DEBUG_COND;
307					break;
308				case 'd':
309					debug |= DEBUG_DIR;
310					break;
311				case 'f':
312					debug |= DEBUG_FOR;
313					break;
314				case 'g':
315					if (modules[1] == '1') {
316						debug |= DEBUG_GRAPH1;
317						++modules;
318					}
319					else if (modules[1] == '2') {
320						debug |= DEBUG_GRAPH2;
321						++modules;
322					}
323					break;
324				case 'j':
325					debug |= DEBUG_JOB;
326					break;
327				case 'l':
328					debug |= DEBUG_LOUD;
329					break;
330				case 'm':
331					debug |= DEBUG_MAKE;
332					break;
333				case 's':
334					debug |= DEBUG_SUFF;
335					break;
336				case 't':
337					debug |= DEBUG_TARG;
338					break;
339				case 'v':
340					debug |= DEBUG_VAR;
341					break;
342				default:
343					warnx("illegal argument to d option "
344					    "-- %c", *modules);
345					usage();
346				}
347			MFLAGS_append("-d", optarg);
348			break;
349		}
350		case 'E':
351			Lst_AtEnd(&envFirstVars, estrdup(optarg));
352			MFLAGS_append("-E", optarg);
353			break;
354		case 'e':
355			checkEnvFirst = TRUE;
356			MFLAGS_append("-e", NULL);
357			break;
358		case 'f':
359			Lst_AtEnd(&makefiles, estrdup(optarg));
360			break;
361		case 'i':
362			ignoreErrors = TRUE;
363			MFLAGS_append("-i", NULL);
364			break;
365		case 'j': {
366			char *endptr;
367
368			forceJobs = TRUE;
369			maxJobs = strtol(optarg, &endptr, 10);
370			if (maxJobs <= 0 || *endptr != '\0') {
371				warnx("illegal number, -j argument -- %s",
372				    optarg);
373				usage();
374			}
375			MFLAGS_append("-j", optarg);
376			break;
377		}
378		case 'k':
379			keepgoing = TRUE;
380			MFLAGS_append("-k", NULL);
381			break;
382		case 'm':
383			Path_AddDir(&sysIncPath, optarg);
384			MFLAGS_append("-m", optarg);
385			break;
386		case 'n':
387			noExecute = TRUE;
388			MFLAGS_append("-n", NULL);
389			break;
390		case 'q':
391			queryFlag = TRUE;
392			/* Kind of nonsensical, wot? */
393			MFLAGS_append("-q", NULL);
394			break;
395		case 'r':
396			noBuiltins = TRUE;
397			MFLAGS_append("-r", NULL);
398			break;
399		case 's':
400			beSilent = TRUE;
401			MFLAGS_append("-s", NULL);
402			break;
403		case 't':
404			touchFlag = TRUE;
405			MFLAGS_append("-t", NULL);
406			break;
407		case 'v':
408			beVerbose = TRUE;
409			MFLAGS_append("-v", NULL);
410			break;
411		case 'x':
412			if (Main_ParseWarn(optarg, 1) != -1)
413				MFLAGS_append("-x", optarg);
414			break;
415
416		default:
417		case '?':
418			usage();
419		}
420	}
421	argv += optind;
422	argc -= optind;
423
424	oldVars = TRUE;
425
426	/*
427	 * Parse the rest of the arguments.
428	 *	o Check for variable assignments and perform them if so.
429	 *	o Check for more flags and restart getopt if so.
430	 *      o Anything else is taken to be a target and added
431	 *	  to the end of the "create" list.
432	 */
433	for (; *argv != NULL; ++argv, --argc) {
434		if (Parse_IsVar(*argv)) {
435			char *ptr = MAKEFLAGS_quote(*argv);
436
437			Var_Append(MAKEFLAGS, ptr, VAR_GLOBAL);
438			Parse_DoVar(*argv, VAR_CMD);
439			free(ptr);
440
441		} else if ((*argv)[0] == '-') {
442			if ((*argv)[1] == '\0') {
443				/*
444				 * (*argv) is a single dash, so we
445				 * just ignore it.
446				 */
447			} else if (found_dd) {
448				/*
449				 * Double dash has been found, ignore
450				 * any more options.  But what do we do
451				 * with it?  For now treat it like a target.
452				 */
453				Lst_AtEnd(&create, estrdup(*argv));
454			} else {
455				/*
456				 * (*argv) is a -flag, so backup argv and
457				 * argc.  getopt() expects options to start
458				 * in the 2nd position.
459				 */
460				argc++;
461				argv--;
462				goto rearg;
463			}
464
465		} else if ((*argv)[0] == '\0') {
466			Punt("illegal (null) argument.");
467
468		} else {
469			Lst_AtEnd(&create, estrdup(*argv));
470		}
471	}
472}
473
474/**
475 * Main_ParseArgLine
476 *  	Used by the parse module when a .MFLAGS or .MAKEFLAGS target
477 *	is encountered and by main() when reading the .MAKEFLAGS envariable.
478 *	Takes a line of arguments and breaks it into its
479 * 	component words and passes those words and the number of them to the
480 *	MainParseArgs function.
481 *	The line should have all its leading whitespace removed.
482 *
483 * Side Effects:
484 *	Only those that come from the various arguments.
485 */
486void
487Main_ParseArgLine(char *line, int mflags)
488{
489	char **argv;			/* Manufactured argument vector */
490	int argc;			/* Number of arguments in argv */
491
492	if (line == NULL)
493		return;
494	for (; *line == ' '; ++line)
495		continue;
496	if (!*line)
497		return;
498
499	if (mflags)
500		argv = MAKEFLAGS_break(line, &argc);
501	else
502		argv = brk_string(line, &argc, TRUE);
503
504	MainParseArgs(argc, argv);
505}
506
507char *
508chdir_verify_path(const char *path, char *obpath)
509{
510	struct stat sb;
511
512	if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
513		if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
514			warn("warning: %s", path);
515			return (NULL);
516		}
517		return (obpath);
518	}
519
520	return (NULL);
521}
522
523static void
524catch_child(int sig __unused)
525{
526}
527
528/*
529 * In lieu of a good way to prevent every possible looping in
530 * make(1), stop there from being more than MKLVL_MAXVAL processes forked
531 * by make(1), to prevent a forkbomb from happening, in a dumb and
532 * mechanical way.
533 */
534static void
535check_make_level(void)
536{
537#ifdef WANT_ENV_MKLVL
538	char	*value = getenv(MKLVL_ENVVAR);
539	int	level = (value == NULL) ? 0 : atoi(value);
540
541	if (level < 0) {
542		errc(2, EAGAIN, "Invalid value for recursion level (%d).",
543		    level);
544	} else if (level > MKLVL_MAXVAL) {
545		errc(2, EAGAIN, "Max recursion level (%d) exceeded.",
546		    MKLVL_MAXVAL);
547	} else {
548		char new_value[32];
549		sprintf(new_value, "%d", level + 1);
550		setenv(MKLVL_ENVVAR, new_value, 1);
551	}
552#endif /* WANT_ENV_MKLVL */
553}
554
555/**
556 * main
557 *	The main function, for obvious reasons. Initializes variables
558 *	and a few modules, then parses the arguments give it in the
559 *	environment and on the command line. Reads the system makefile
560 *	followed by either Makefile, makefile or the file given by the
561 *	-f argument. Sets the .MAKEFLAGS PMake variable based on all the
562 *	flags it has received by then uses either the Make or the Compat
563 *	module to create the initial list of targets.
564 *
565 * Results:
566 *	If -q was given, exits -1 if anything was out-of-date. Else it exits
567 *	0.
568 *
569 * Side Effects:
570 *	The program exits when done. Targets are created. etc. etc. etc.
571 */
572int
573main(int argc, char **argv)
574{
575	Boolean outOfDate = TRUE; 	/* FALSE if all targets up to date */
576	char *p, *p1, *pathp;
577	char *path;
578	char mdpath[MAXPATHLEN];
579	char obpath[MAXPATHLEN];
580	char cdpath[MAXPATHLEN];
581    	const char *machine = getenv("MACHINE");
582	const char *machine_arch = getenv("MACHINE_ARCH");
583	const char *machine_cpu = getenv("MACHINE_CPU");
584	char *cp = NULL, *start;
585
586	/* avoid faults on read-only strings */
587	static char syspath[] = PATH_DEFSYSPATH;
588
589	{
590	/*
591	 * Catch SIGCHLD so that we get kicked out of select() when we
592	 * need to look at a child.  This is only known to matter for the
593	 * -j case (perhaps without -P).
594	 *
595	 * XXX this is intentionally misplaced.
596	 */
597	struct sigaction sa;
598
599	sigemptyset(&sa.sa_mask);
600	sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
601	sa.sa_handler = catch_child;
602	sigaction(SIGCHLD, &sa, NULL);
603	}
604
605	check_make_level();
606
607#if DEFSHELL == 2
608	/*
609	 * Turn off ENV to make ksh happier.
610	 */
611	unsetenv("ENV");
612#endif
613
614#ifdef RLIMIT_NOFILE
615	/*
616	 * get rid of resource limit on file descriptors
617	 */
618	{
619		struct rlimit rl;
620		if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
621		    rl.rlim_cur != rl.rlim_max) {
622			rl.rlim_cur = rl.rlim_max;
623			setrlimit(RLIMIT_NOFILE, &rl);
624		}
625	}
626#endif
627
628	/*
629	 * PC-98 kernel sets the `i386' string to the utsname.machine and
630	 * it cannot be distinguished from IBM-PC by uname(3).  Therefore,
631	 * we check machine.ispc98 and adjust the machine variable before
632	 * using usname(3) below.
633	 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
634	 * __FreeBSD_version was defined as 300003. So, this check can
635	 * safely be done with any kernel with version > 300003.
636	 */
637	if (!machine) {
638		int	ispc98;
639		size_t	len;
640
641		len = sizeof(ispc98);
642		if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
643			if (ispc98)
644				machine = "pc98";
645		}
646	}
647
648	/*
649	 * Get the name of this type of MACHINE from utsname
650	 * so we can share an executable for similar machines.
651	 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
652	 *
653	 * Note that while MACHINE is decided at run-time,
654	 * MACHINE_ARCH is always known at compile time.
655	 */
656	if (!machine) {
657#ifndef MACHINE
658		static struct utsname utsname;
659
660		if (uname(&utsname) == -1)
661			err(2, "uname");
662		machine = utsname.machine;
663#else
664		machine = MACHINE;
665#endif
666	}
667
668	if (!machine_arch) {
669#ifndef MACHINE_ARCH
670		machine_arch = "unknown";
671#else
672		machine_arch = MACHINE_ARCH;
673#endif
674	}
675
676	/*
677	 * Set machine_cpu to the minumum supported CPU revision based
678	 * on the target architecture, if not already set.
679	 */
680	if (!machine_cpu) {
681		if (!strcmp(machine_arch, "i386"))
682			machine_cpu = "i386";
683		else if (!strcmp(machine_arch, "alpha"))
684			machine_cpu = "ev4";
685		else
686			machine_cpu = "unknown";
687	}
688
689	expandVars = TRUE;
690	beSilent = FALSE;		/* Print commands as executed */
691	ignoreErrors = FALSE;		/* Pay attention to non-zero returns */
692	noExecute = FALSE;		/* Execute all commands */
693	keepgoing = FALSE;		/* Stop on error */
694	allPrecious = FALSE;		/* Remove targets when interrupted */
695	queryFlag = FALSE;		/* This is not just a check-run */
696	noBuiltins = FALSE;		/* Read the built-in rules */
697	touchFlag = FALSE;		/* Actually update targets */
698	usePipes = TRUE;		/* Catch child output in pipes */
699	debug = 0;			/* No debug verbosity, please. */
700	jobsRunning = FALSE;
701
702	maxJobs = DEFMAXJOBS;
703	forceJobs = FALSE;              /* No -j flag */
704	compatMake = FALSE;		/* No compat mode */
705
706	/*
707	 * Initialize the parsing, directory and variable modules to prepare
708	 * for the reading of inclusion paths and variable settings on the
709	 * command line
710	 */
711	Dir_Init();		/* Initialize directory structures so -I flags
712				 * can be processed correctly */
713	Var_Init(environ);	/* As well as the lists of variables for
714				 * parsing arguments */
715        str_init();
716
717	/*
718	 * Initialize various variables.
719	 *	MAKE also gets this name, for compatibility
720	 *	.MAKEFLAGS gets set to the empty string just in case.
721	 *	MFLAGS also gets initialized empty, for compatibility.
722	 */
723	Var_Set("MAKE", argv[0], VAR_GLOBAL);
724	Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
725	Var_Set("MFLAGS", "", VAR_GLOBAL);
726	Var_Set("MACHINE", machine, VAR_GLOBAL);
727	Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
728	Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
729#ifdef MAKE_VERSION
730	Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
731#endif
732
733	/*
734	 * First snag things out of the MAKEFLAGS environment
735	 * variable.  Then parse the command line arguments.
736	 */
737	Main_ParseArgLine(getenv("MAKEFLAGS"), 1);
738
739	MainParseArgs(argc, argv);
740
741	/*
742	 * Find where we are...
743	 */
744	curdir = cdpath;
745	if (getcwd(curdir, MAXPATHLEN) == NULL)
746		err(2, NULL);
747
748	{
749	struct stat sa;
750
751	if (stat(curdir, &sa) == -1)
752	    err(2, "%s", curdir);
753	}
754
755	/*
756	 * The object directory location is determined using the
757	 * following order of preference:
758	 *
759	 *	1. MAKEOBJDIRPREFIX`cwd`
760	 *	2. MAKEOBJDIR
761	 *	3. PATH_OBJDIR.${MACHINE}
762	 *	4. PATH_OBJDIR
763	 *	5. PATH_OBJDIRPREFIX`cwd`
764	 *
765	 * If one of the first two fails, use the current directory.
766	 * If the remaining three all fail, use the current directory.
767	 *
768	 * Once things are initted,
769	 * have to add the original directory to the search path,
770	 * and modify the paths for the Makefiles apropriately.  The
771	 * current directory is also placed as a variable for make scripts.
772	 */
773	if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
774		if (!(path = getenv("MAKEOBJDIR"))) {
775			path = PATH_OBJDIR;
776			pathp = PATH_OBJDIRPREFIX;
777			snprintf(mdpath, MAXPATHLEN, "%s.%s",
778					path, machine);
779			if (!(objdir = chdir_verify_path(mdpath, obpath)))
780				if (!(objdir=chdir_verify_path(path, obpath))) {
781					snprintf(mdpath, MAXPATHLEN,
782							"%s%s", pathp, curdir);
783					if (!(objdir=chdir_verify_path(mdpath,
784								       obpath)))
785						objdir = curdir;
786				}
787		}
788		else if (!(objdir = chdir_verify_path(path, obpath)))
789			objdir = curdir;
790	}
791	else {
792		snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
793		if (!(objdir = chdir_verify_path(mdpath, obpath)))
794			objdir = curdir;
795	}
796	Dir_InitDot();		/* Initialize the "." directory */
797	if (objdir != curdir)
798		Path_AddDir(&dirSearchPath, curdir);
799	Var_Set(".ST_EXPORTVAR", "YES", VAR_GLOBAL);
800	Var_Set(".CURDIR", curdir, VAR_GLOBAL);
801	Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
802
803	if (getenv("MAKE_JOBS_FIFO") != NULL)
804		forceJobs = TRUE;
805	/*
806	 * Be compatible if user did not specify -j and did not explicitly
807	 * turned compatibility on
808	 */
809	if (!compatMake && !forceJobs)
810		compatMake = TRUE;
811
812	/*
813	 * Initialize target and suffix modules in preparation for
814	 * parsing the makefile(s)
815	 */
816	Targ_Init();
817	Suff_Init();
818
819	DEFAULT = NULL;
820	time(&now);
821
822	/*
823	 * Set up the .TARGETS variable to contain the list of targets to be
824	 * created. If none specified, make the variable empty -- the parser
825	 * will fill the thing in with the default or .MAIN target.
826	 */
827	if (!Lst_IsEmpty(&create)) {
828		LstNode *ln;
829
830		for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) {
831			char *name = Lst_Datum(ln);
832
833			Var_Append(".TARGETS", name, VAR_GLOBAL);
834		}
835	} else
836		Var_Set(".TARGETS", "", VAR_GLOBAL);
837
838
839	/*
840	 * If no user-supplied system path was given (through the -m option)
841	 * add the directories from the DEFSYSPATH (more than one may be given
842	 * as dir1:...:dirn) to the system include path.
843	 */
844	if (TAILQ_EMPTY(&sysIncPath)) {
845		for (start = syspath; *start != '\0'; start = cp) {
846			for (cp = start; *cp != '\0' && *cp != ':'; cp++)
847				continue;
848			if (*cp == '\0') {
849				Path_AddDir(&sysIncPath, start);
850			} else {
851				*cp++ = '\0';
852				Path_AddDir(&sysIncPath, start);
853			}
854		}
855	}
856
857	/*
858	 * Read in the built-in rules first, followed by the specified
859	 * makefile, if it was (makefile != (char *) NULL), or the default
860	 * Makefile and makefile, in that order, if it wasn't.
861	 */
862	if (!noBuiltins) {
863		/* Path of sys.mk */
864		Lst sysMkPath = Lst_Initializer(sysMkPath);
865		LstNode *ln;
866
867		Path_Expand(PATH_DEFSYSMK, &sysIncPath, &sysMkPath);
868		if (Lst_IsEmpty(&sysMkPath))
869			Fatal("make: no system rules (%s).", PATH_DEFSYSMK);
870		LST_FOREACH(ln, &sysMkPath) {
871			if (!ReadMakefile(Lst_Datum(ln)))
872				break;
873		}
874		if (ln != NULL)
875			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
876		Lst_Destroy(&sysMkPath, free);
877	}
878
879	if (!Lst_IsEmpty(&makefiles)) {
880		LstNode *ln;
881
882		LST_FOREACH(ln, &makefiles) {
883			if (!ReadMakefile(Lst_Datum(ln)))
884				break;
885		}
886		if (ln != NULL)
887			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
888	} else if (!ReadMakefile("BSDmakefile"))
889	    if (!ReadMakefile("makefile"))
890		ReadMakefile("Makefile");
891
892	ReadMakefile(".depend");
893
894	/* Install all the flags into the MAKE envariable. */
895	if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
896		setenv("MAKEFLAGS", p, 1);
897	free(p1);
898
899	/*
900	 * For compatibility, look at the directories in the VPATH variable
901	 * and add them to the search path, if the variable is defined. The
902	 * variable's value is in the same format as the PATH envariable, i.e.
903	 * <directory>:<directory>:<directory>...
904	 */
905	if (Var_Exists("VPATH", VAR_CMD)) {
906		/*
907		 * GCC stores string constants in read-only memory, but
908		 * Var_Subst will want to write this thing, so store it
909		 * in an array
910		 */
911		static char VPATH[] = "${VPATH}";
912		Buffer	*buf;
913		char	*vpath;
914		char	*ptr;
915		char	savec;
916
917		buf = Var_Subst(VPATH, VAR_CMD, FALSE);
918
919		vpath = Buf_Data(buf);
920		do {
921			/* skip to end of directory */
922			for (ptr = vpath; *ptr != ':' && *ptr != '\0'; ptr++)
923				;
924
925			/* Save terminator character so know when to stop */
926			savec = *ptr;
927			*ptr = '\0';
928
929			/* Add directory to search path */
930			Path_AddDir(&dirSearchPath, vpath);
931
932			vpath = ptr + 1;
933		} while (savec != '\0');
934
935		Buf_Destroy(buf, TRUE);
936	}
937
938	/*
939	 * Now that all search paths have been read for suffixes et al, it's
940	 * time to add the default search path to their lists...
941	 */
942	Suff_DoPaths();
943
944	/* print the initial graph, if the user requested it */
945	if (DEBUG(GRAPH1))
946		Targ_PrintGraph(1);
947
948	/* print the values of any variables requested by the user */
949	if (Lst_IsEmpty(&variables)) {
950		/*
951		 * Since the user has not requested that any variables
952		 * be printed, we can build targets.
953		 *
954		 * Have read the entire graph and need to make a list of targets
955		 * to create. If none was given on the command line, we consult
956		 * the parsing module to find the main target(s) to create.
957		 */
958		Lst targs = Lst_Initializer(targs);
959
960		if (Lst_IsEmpty(&create))
961			Parse_MainName(&targs);
962		else
963			Targ_FindList(&targs, &create, TARG_CREATE);
964
965		if (compatMake) {
966			/*
967			 * Compat_Init will take care of creating
968			 * all the targets as well as initializing
969			 * the module.
970			 */
971			Compat_Run(&targs);
972			outOfDate = 0;
973		} else {
974			/*
975			 * Initialize job module before traversing
976			 * the graph, now that any .BEGIN and .END
977			 * targets have been read.  This is done
978			 * only if the -q flag wasn't given (to
979			 * prevent the .BEGIN from being executed
980			 * should it exist).
981			 */
982			if (!queryFlag) {
983				Job_Init(maxJobs);
984				jobsRunning = TRUE;
985			}
986
987			/* Traverse the graph, checking on all the targets */
988			outOfDate = Make_Run(&targs);
989		}
990		Lst_Destroy(&targs, NOFREE);
991
992	} else {
993		/*
994		 * Print the values of any variables requested by
995		 * the user.
996		 */
997		LstNode		*n;
998		const char	*name;
999		char		*v;
1000		char		*value;
1001
1002		LST_FOREACH(n, &variables) {
1003			name = Lst_Datum(n);
1004			if (expandVars) {
1005				v = emalloc(strlen(name) + 1 + 3);
1006				sprintf(v, "${%s}", name);
1007
1008				value = Buf_Peel(Var_Subst(v,
1009				    VAR_GLOBAL, FALSE));
1010				printf("%s\n", value);
1011
1012				free(v);
1013				free(value);
1014			} else {
1015				value = Var_Value(name, VAR_GLOBAL, &v);
1016				printf("%s\n", value != NULL ? value : "");
1017				if (v != NULL)
1018					free(v);
1019			}
1020		}
1021	}
1022
1023	Lst_Destroy(&variables, free);
1024	Lst_Destroy(&makefiles, free);
1025	Lst_Destroy(&create, free);
1026
1027	/* print the graph now it's been processed if the user requested it */
1028	if (DEBUG(GRAPH2))
1029		Targ_PrintGraph(2);
1030
1031	if (queryFlag && outOfDate)
1032		return (1);
1033	else
1034		return (0);
1035}
1036
1037/**
1038 * ReadMakefile
1039 *	Open and parse the given makefile.
1040 *
1041 * Results:
1042 *	TRUE if ok. FALSE if couldn't open file.
1043 *
1044 * Side Effects:
1045 *	lots
1046 */
1047static Boolean
1048ReadMakefile(const char *p)
1049{
1050	char *fname;			/* makefile to read */
1051	FILE *stream;
1052	char *name, path[MAXPATHLEN];
1053	char *MAKEFILE;
1054	int setMAKEFILE;
1055
1056	/* XXX - remove this once constification is done */
1057	fname = estrdup(p);
1058
1059	if (!strcmp(fname, "-")) {
1060		Parse_File("(stdin)", stdin);
1061		Var_Set("MAKEFILE", "", VAR_GLOBAL);
1062	} else {
1063		setMAKEFILE = strcmp(fname, ".depend");
1064
1065		/* if we've chdir'd, rebuild the path name */
1066		if (curdir != objdir && *fname != '/') {
1067			snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
1068			/*
1069			 * XXX The realpath stuff breaks relative includes
1070			 * XXX in some cases.   The problem likely is in
1071			 * XXX parse.c where it does special things in
1072			 * XXX ParseDoInclude if the file is relateive
1073			 * XXX or absolute and not a system file.  There
1074			 * XXX it assumes that if the current file that's
1075			 * XXX being included is absolute, that any files
1076			 * XXX that it includes shouldn't do the -I path
1077			 * XXX stuff, which is inconsistant with historical
1078			 * XXX behavior.  However, I can't pentrate the mists
1079			 * XXX further, so I'm putting this workaround in
1080			 * XXX here until such time as the underlying bug
1081			 * XXX can be fixed.
1082			 */
1083#if THIS_BREAKS_THINGS
1084			if (realpath(path, path) != NULL &&
1085			    (stream = fopen(path, "r")) != NULL) {
1086				MAKEFILE = fname;
1087				fname = path;
1088				goto found;
1089			}
1090		} else if (realpath(fname, path) != NULL) {
1091			MAKEFILE = fname;
1092			fname = path;
1093			if ((stream = fopen(fname, "r")) != NULL)
1094				goto found;
1095		}
1096#else
1097			if ((stream = fopen(path, "r")) != NULL) {
1098				MAKEFILE = fname;
1099				fname = path;
1100				goto found;
1101			}
1102		} else {
1103			MAKEFILE = fname;
1104			if ((stream = fopen(fname, "r")) != NULL)
1105				goto found;
1106		}
1107#endif
1108		/* look in -I and system include directories. */
1109		name = Path_FindFile(fname, &parseIncPath);
1110		if (!name)
1111			name = Path_FindFile(fname, &sysIncPath);
1112		if (!name || !(stream = fopen(name, "r")))
1113			return (FALSE);
1114		MAKEFILE = fname = name;
1115		/*
1116		 * set the MAKEFILE variable desired by System V fans -- the
1117		 * placement of the setting here means it gets set to the last
1118		 * makefile specified, as it is set by SysV make.
1119		 */
1120found:
1121		if (setMAKEFILE)
1122			Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
1123		Parse_File(fname, stream);
1124		fclose(stream);
1125	}
1126	return (TRUE);
1127}
1128
1129/*
1130 * usage --
1131 *	exit with usage message
1132 */
1133static void
1134usage(void)
1135{
1136	fprintf(stderr, "%s\n%s\n%s\n%s\n",
1137"usage: make [-ABPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
1138"            [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
1139"            [-m directory] [-V variable] [variable=value] [-x warn_flag]",
1140"            [target ...]");
1141	exit(2);
1142}
1143