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
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
38 * @(#) Copyright (c) 1988, 1989, 1990, 1993 The Regents of the University of California. All rights reserved.
39 * @(#)main.c 8.3 (Berkeley) 3/19/94
40 * $FreeBSD: src/usr.bin/make/main.c,v 1.118 2005/02/13 13:33:56 harti Exp $
41 * $DragonFly: src/usr.bin/make/main.c,v 1.78 2005/04/22 10:38:30 okumoto Exp $
46 * The main file for this entire program. Exit routines etc
49 * Utility functions defined in this file:
51 * Takes a line of arguments, breaks them and
52 * treats them as if they were given when first
53 * invoked. Used by the parse module to implement
58 #include <sys/utsname.h>
60 #include <sys/param.h>
63 #include <sys/queue.h>
64 #include <sys/resource.h>
82 #include "pathnames.h"
89 #define WANT_ENV_MKLVL 1
90 #define MKLVL_MAXVAL 500
91 #define MKLVL_ENVVAR "__MKLVL__"
93 #define MAKEFLAGS ".MAKEFLAGS"
95 extern char **environ; /* XXX what header declares this variable? */
97 /* Targets to be made */
98 Lst create = Lst_Initializer(create);
100 time_t now; /* Time at start of make */
101 struct GNode *DEFAULT; /* .DEFAULT node */
102 Boolean allPrecious; /* .PRECIOUS given on line by itself */
104 static Boolean noBuiltins; /* -r flag */
106 /* ordered list of makefiles to read */
107 static Lst makefiles = Lst_Initializer(makefiles);
109 static Boolean expandVars; /* fully expand printed variables */
111 /* list of variables to print */
112 static Lst variables = Lst_Initializer(variables);
114 int maxJobs; /* -j argument */
115 static Boolean forceJobs; /* -j argument given */
116 Boolean compatMake; /* -B argument */
117 Boolean debug; /* -d flag */
118 Boolean noExecute; /* -n flag */
119 Boolean keepgoing; /* -k flag */
120 Boolean queryFlag; /* -q flag */
121 Boolean touchFlag; /* -t flag */
122 Boolean usePipes; /* !-P flag */
123 Boolean ignoreErrors; /* -i flag */
124 Boolean beSilent; /* -s flag */
125 Boolean beVerbose; /* -v flag */
126 Boolean oldVars; /* variable substitution style */
127 Boolean checkEnvFirst; /* -e flag */
129 /* (-E) vars to override from env */
130 Lst envFirstVars = Lst_Initializer(envFirstVars);
132 Boolean jobsRunning; /* TRUE if the jobs might be running */
134 char *chdir_verify_path(const char *, char *);
135 static int ReadMakefile(const char *);
136 static void usage(void);
138 static char *curdir; /* startup directory */
139 static char *objdir; /* where we chdir'ed to */
143 * Append a flag with an optional argument to MAKEFLAGS and MFLAGS
146 MFLAGS_append(const char *flag, char *arg)
150 Var_Append(MAKEFLAGS, flag, VAR_GLOBAL);
152 str = MAKEFLAGS_quote(arg);
153 Var_Append(MAKEFLAGS, str, VAR_GLOBAL);
157 Var_Append("MFLAGS", flag, VAR_GLOBAL);
159 str = MAKEFLAGS_quote(arg);
160 Var_Append("MFLAGS", str, VAR_GLOBAL);
167 * Parse a given argument vector. Called from main() and from
168 * Main_ParseArgLine() when the .MAKEFLAGS target is used.
170 * XXX: Deal with command line overriding .MAKEFLAGS in makefile
173 * Various global and local flags will be set depending on the flags
177 MainParseArgs(int argc, char **argv)
180 Boolean found_dd = FALSE;
183 optind = 1; /* since we're called more than once */
185 #define OPTFLAGS "ABC:D:E:I:PSV:Xd:ef:ij:km:nqrstv"
187 if ((optind < argc) && strcmp(argv[optind], "--") == 0) {
190 if ((c = getopt(argc, argv, OPTFLAGS)) == -1) {
197 MFLAGS_append("-A", NULL);
200 if (chdir(optarg) == -1)
201 err(1, "chdir %s", optarg);
204 Var_Set(optarg, "1", VAR_GLOBAL);
205 MFLAGS_append("-D", optarg);
208 Parse_AddIncludeDir(optarg);
209 MFLAGS_append("-I", optarg);
212 Lst_AtEnd(&variables, estrdup(optarg));
213 MFLAGS_append("-V", optarg);
220 MFLAGS_append("-B", NULL);
221 unsetenv("MAKE_JOBS_FIFO");
225 MFLAGS_append("-P", NULL);
229 MFLAGS_append("-S", NULL);
232 char *modules = optarg;
234 for (; *modules; ++modules)
252 if (modules[1] == '1') {
253 debug |= DEBUG_GRAPH1;
256 else if (modules[1] == '2') {
257 debug |= DEBUG_GRAPH2;
280 warnx("illegal argument to d option "
284 MFLAGS_append("-d", optarg);
288 Lst_AtEnd(&envFirstVars, estrdup(optarg));
289 MFLAGS_append("-E", optarg);
292 checkEnvFirst = TRUE;
293 MFLAGS_append("-e", NULL);
296 Lst_AtEnd(&makefiles, estrdup(optarg));
300 MFLAGS_append("-i", NULL);
306 maxJobs = strtol(optarg, &endptr, 10);
307 if (maxJobs <= 0 || *endptr != '\0') {
308 warnx("illegal number, -j argument -- %s",
312 MFLAGS_append("-j", optarg);
317 MFLAGS_append("-k", NULL);
320 Path_AddDir(&sysIncPath, optarg);
321 MFLAGS_append("-m", optarg);
325 MFLAGS_append("-n", NULL);
329 /* Kind of nonsensical, wot? */
330 MFLAGS_append("-q", NULL);
334 MFLAGS_append("-r", NULL);
338 MFLAGS_append("-s", NULL);
342 MFLAGS_append("-t", NULL);
346 MFLAGS_append("-v", NULL);
359 * Parse the rest of the arguments.
360 * o Check for variable assignments and perform them if so.
361 * o Check for more flags and restart getopt if so.
362 * o Anything else is taken to be a target and added
363 * to the end of the "create" list.
365 for (; *argv != NULL; ++argv, --argc) {
366 if (Parse_IsVar(*argv)) {
367 char *ptr = MAKEFLAGS_quote(*argv);
369 Var_Append(MAKEFLAGS, ptr, VAR_GLOBAL);
370 Parse_DoVar(*argv, VAR_CMD);
373 } else if ((*argv)[0] == '-') {
374 if ((*argv)[1] == '\0') {
376 * (*argv) is a single dash, so we
379 } else if (found_dd) {
381 * Double dash has been found, ignore
382 * any more options. But what do we do
383 * with it? For now treat it like a target.
385 Lst_AtEnd(&create, estrdup(*argv));
388 * (*argv) is a -flag, so backup argv and
389 * argc. getopt() expects options to start
390 * in the 2nd position.
397 } else if ((*argv)[0] == '\0') {
398 Punt("illegal (null) argument.");
401 Lst_AtEnd(&create, estrdup(*argv));
408 * Used by the parse module when a .MFLAGS or .MAKEFLAGS target
409 * is encountered and by main() when reading the .MAKEFLAGS envariable.
410 * Takes a line of arguments and breaks it into its
411 * component words and passes those words and the number of them to the
412 * MainParseArgs function.
413 * The line should have all its leading whitespace removed.
416 * Only those that come from the various arguments.
419 Main_ParseArgLine(char *line, int mflags)
421 char **argv; /* Manufactured argument vector */
422 int argc; /* Number of arguments in argv */
426 for (; *line == ' '; ++line)
432 argv = MAKEFLAGS_break(line, &argc);
434 argv = brk_string(line, &argc, TRUE);
436 MainParseArgs(argc, argv);
440 chdir_verify_path(const char *path, char *obpath)
444 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
445 if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
446 warn("warning: %s", path);
456 catch_child(int sig __unused)
461 * In lieu of a good way to prevent every possible looping in
462 * make(1), stop there from being more than MKLVL_MAXVAL processes forked
463 * by make(1), to prevent a forkbomb from happening, in a dumb and
467 check_make_level(void)
469 #ifdef WANT_ENV_MKLVL
470 char *value = getenv(MKLVL_ENVVAR);
471 int level = (value == NULL) ? 0 : atoi(value);
474 errc(2, EAGAIN, "Invalid value for recursion level (%d).",
476 } else if (level > MKLVL_MAXVAL) {
477 errc(2, EAGAIN, "Max recursion level (%d) exceeded.",
481 sprintf(new_value, "%d", level + 1);
482 setenv(MKLVL_ENVVAR, new_value, 1);
484 #endif /* WANT_ENV_MKLVL */
489 * The main function, for obvious reasons. Initializes variables
490 * and a few modules, then parses the arguments give it in the
491 * environment and on the command line. Reads the system makefile
492 * followed by either Makefile, makefile or the file given by the
493 * -f argument. Sets the .MAKEFLAGS PMake variable based on all the
494 * flags it has received by then uses either the Make or the Compat
495 * module to create the initial list of targets.
498 * If -q was given, exits -1 if anything was out-of-date. Else it exits
502 * The program exits when done. Targets are created. etc. etc. etc.
505 main(int argc, char **argv)
507 Boolean outOfDate = TRUE; /* FALSE if all targets up to date */
511 char mdpath[MAXPATHLEN];
512 char obpath[MAXPATHLEN];
513 char cdpath[MAXPATHLEN];
514 const char *machine = getenv("MACHINE");
515 const char *machine_arch = getenv("MACHINE_ARCH");
516 const char *machine_cpu = getenv("MACHINE_CPU");
517 char *cp = NULL, *start;
519 /* avoid faults on read-only strings */
520 static char syspath[] = PATH_DEFSYSPATH;
524 * Catch SIGCHLD so that we get kicked out of select() when we
525 * need to look at a child. This is only known to matter for the
526 * -j case (perhaps without -P).
528 * XXX this is intentionally misplaced.
532 sigemptyset(&sa.sa_mask);
533 sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
534 sa.sa_handler = catch_child;
535 sigaction(SIGCHLD, &sa, NULL);
542 * Turn off ENV to make ksh happier.
549 * get rid of resource limit on file descriptors
553 if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
554 rl.rlim_cur != rl.rlim_max) {
555 rl.rlim_cur = rl.rlim_max;
556 setrlimit(RLIMIT_NOFILE, &rl);
561 * Get the name of this type of MACHINE from utsname
562 * so we can share an executable for similar machines.
563 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
565 * Note that while MACHINE is decided at run-time,
566 * MACHINE_ARCH is always known at compile time.
570 static struct utsname utsname;
572 if (uname(&utsname) == -1)
574 machine = utsname.machine;
582 machine_arch = "unknown";
584 machine_arch = MACHINE_ARCH;
589 * Set machine_cpu to the minumum supported CPU revision based
590 * on the target architecture, if not already set.
593 if (!strcmp(machine_arch, "i386"))
594 machine_cpu = "i386";
595 else if (!strcmp(machine_arch, "alpha"))
598 machine_cpu = "unknown";
602 beSilent = FALSE; /* Print commands as executed */
603 ignoreErrors = FALSE; /* Pay attention to non-zero returns */
604 noExecute = FALSE; /* Execute all commands */
605 keepgoing = FALSE; /* Stop on error */
606 allPrecious = FALSE; /* Remove targets when interrupted */
607 queryFlag = FALSE; /* This is not just a check-run */
608 noBuiltins = FALSE; /* Read the built-in rules */
609 touchFlag = FALSE; /* Actually update targets */
610 usePipes = TRUE; /* Catch child output in pipes */
611 debug = 0; /* No debug verbosity, please. */
614 maxJobs = DEFMAXJOBS;
615 forceJobs = FALSE; /* No -j flag */
616 compatMake = FALSE; /* No compat mode */
619 * Initialize the parsing, directory and variable modules to prepare
620 * for the reading of inclusion paths and variable settings on the
623 Dir_Init(); /* Initialize directory structures so -I flags
624 * can be processed correctly */
625 Var_Init(environ); /* As well as the lists of variables for
626 * parsing arguments */
630 * Initialize various variables.
631 * MAKE also gets this name, for compatibility
632 * .MAKEFLAGS gets set to the empty string just in case.
633 * MFLAGS also gets initialized empty, for compatibility.
635 Var_Set("MAKE", argv[0], VAR_GLOBAL);
636 Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
637 Var_Set("MFLAGS", "", VAR_GLOBAL);
638 Var_Set("MACHINE", machine, VAR_GLOBAL);
639 Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
640 Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
642 Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
646 * First snag things out of the MAKEFLAGS environment
647 * variable. Then parse the command line arguments.
649 Main_ParseArgLine(getenv("MAKEFLAGS"), 1);
651 MainParseArgs(argc, argv);
654 * Find where we are...
657 if (getcwd(curdir, MAXPATHLEN) == NULL)
663 if (stat(curdir, &sa) == -1)
664 err(2, "%s", curdir);
668 * The object directory location is determined using the
669 * following order of preference:
671 * 1. MAKEOBJDIRPREFIX`cwd`
673 * 3. PATH_OBJDIR.${MACHINE}
675 * 5. PATH_OBJDIRPREFIX`cwd`
677 * If one of the first two fails, use the current directory.
678 * If the remaining three all fail, use the current directory.
680 * Once things are initted,
681 * have to add the original directory to the search path,
682 * and modify the paths for the Makefiles apropriately. The
683 * current directory is also placed as a variable for make scripts.
685 if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
686 if (!(path = getenv("MAKEOBJDIR"))) {
688 pathp = PATH_OBJDIRPREFIX;
689 snprintf(mdpath, MAXPATHLEN, "%s.%s",
691 if (!(objdir = chdir_verify_path(mdpath, obpath)))
692 if (!(objdir=chdir_verify_path(path, obpath))) {
693 snprintf(mdpath, MAXPATHLEN,
694 "%s%s", pathp, curdir);
695 if (!(objdir=chdir_verify_path(mdpath,
700 else if (!(objdir = chdir_verify_path(path, obpath)))
704 snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
705 if (!(objdir = chdir_verify_path(mdpath, obpath)))
708 Dir_InitDot(); /* Initialize the "." directory */
709 if (objdir != curdir)
710 Path_AddDir(&dirSearchPath, curdir);
711 Var_Set(".DIRECTIVE_MAKEENV", "YES", VAR_GLOBAL);
712 Var_Set(".ST_EXPORTVAR", "YES", VAR_GLOBAL);
713 Var_Set(".CURDIR", curdir, VAR_GLOBAL);
714 Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
716 if (getenv("MAKE_JOBS_FIFO") != NULL)
719 * Be compatible if user did not specify -j and did not explicitly
720 * turned compatibility on
722 if (!compatMake && !forceJobs)
726 * Initialize target and suffix modules in preparation for
727 * parsing the makefile(s)
736 * Set up the .TARGETS variable to contain the list of targets to be
737 * created. If none specified, make the variable empty -- the parser
738 * will fill the thing in with the default or .MAIN target.
740 if (!Lst_IsEmpty(&create)) {
743 for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) {
744 char *name = Lst_Datum(ln);
746 Var_Append(".TARGETS", name, VAR_GLOBAL);
749 Var_Set(".TARGETS", "", VAR_GLOBAL);
753 * If no user-supplied system path was given (through the -m option)
754 * add the directories from the DEFSYSPATH (more than one may be given
755 * as dir1:...:dirn) to the system include path.
757 if (TAILQ_EMPTY(&sysIncPath)) {
758 for (start = syspath; *start != '\0'; start = cp) {
759 for (cp = start; *cp != '\0' && *cp != ':'; cp++)
762 Path_AddDir(&sysIncPath, start);
765 Path_AddDir(&sysIncPath, start);
771 * Read in the built-in rules first, followed by the specified
772 * makefile, if it was (makefile != (char *) NULL), or the default
773 * Makefile and makefile, in that order, if it wasn't.
777 Lst sysMkPath = Lst_Initializer(sysMkPath);
780 Path_Expand(PATH_DEFSYSMK, &sysIncPath, &sysMkPath);
781 if (Lst_IsEmpty(&sysMkPath))
782 Fatal("make: no system rules (%s).", PATH_DEFSYSMK);
783 LST_FOREACH(ln, &sysMkPath) {
784 if (!ReadMakefile(Lst_Datum(ln)))
788 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
789 Lst_Destroy(&sysMkPath, free);
792 if (!Lst_IsEmpty(&makefiles)) {
795 LST_FOREACH(ln, &makefiles) {
796 if (!ReadMakefile(Lst_Datum(ln)))
800 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
801 } else if (!ReadMakefile("BSDmakefile"))
802 if (!ReadMakefile("makefile"))
803 ReadMakefile("Makefile");
805 ReadMakefile(".depend");
807 /* Install all the flags into the MAKE envariable. */
808 if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
809 setenv("MAKEFLAGS", p, 1);
813 * For compatibility, look at the directories in the VPATH variable
814 * and add them to the search path, if the variable is defined. The
815 * variable's value is in the same format as the PATH envariable, i.e.
816 * <directory>:<directory>:<directory>...
818 if (Var_Exists("VPATH", VAR_CMD)) {
820 * GCC stores string constants in read-only memory, but
821 * Var_Subst will want to write this thing, so store it
824 static char VPATH[] = "${VPATH}";
830 buf = Var_Subst(VPATH, VAR_CMD, FALSE);
832 vpath = Buf_Data(buf);
834 /* skip to end of directory */
835 for (ptr = vpath; *ptr != ':' && *ptr != '\0'; ptr++)
838 /* Save terminator character so know when to stop */
842 /* Add directory to search path */
843 Path_AddDir(&dirSearchPath, vpath);
846 } while (savec != '\0');
848 Buf_Destroy(buf, TRUE);
852 * Now that all search paths have been read for suffixes et al, it's
853 * time to add the default search path to their lists...
857 /* print the initial graph, if the user requested it */
861 /* print the values of any variables requested by the user */
862 if (Lst_IsEmpty(&variables)) {
864 * Since the user has not requested that any variables
865 * be printed, we can build targets.
867 * Have read the entire graph and need to make a list of targets
868 * to create. If none was given on the command line, we consult
869 * the parsing module to find the main target(s) to create.
871 Lst targs = Lst_Initializer(targs);
873 if (Lst_IsEmpty(&create))
874 Parse_MainName(&targs);
876 Targ_FindList(&targs, &create, TARG_CREATE);
880 * Compat_Init will take care of creating
881 * all the targets as well as initializing
888 * Initialize job module before traversing
889 * the graph, now that any .BEGIN and .END
890 * targets have been read. This is done
891 * only if the -q flag wasn't given (to
892 * prevent the .BEGIN from being executed
900 /* Traverse the graph, checking on all the targets */
901 outOfDate = Make_Run(&targs);
903 Lst_Destroy(&targs, NOFREE);
907 * Print the values of any variables requested by
912 LST_FOREACH(n, &variables) {
913 const char *name = Lst_Datum(n);
918 v = emalloc(strlen(name) + 1 + 3);
919 sprintf(v, "${%s}", name);
921 value = Buf_Peel(Var_Subst(v,
923 printf("%s\n", value);
930 value = Var_Value(name, VAR_GLOBAL, &v);
931 printf("%s\n", value != NULL ? value : "");
938 Lst_Destroy(&variables, free);
939 Lst_Destroy(&makefiles, free);
940 Lst_Destroy(&create, free);
942 /* print the graph now it's been processed if the user requested it */
946 if (queryFlag && outOfDate)
954 * Open and parse the given makefile.
957 * TRUE if ok. FALSE if couldn't open file.
963 ReadMakefile(const char *p)
965 char *fname; /* makefile to read */
967 char *name, path[MAXPATHLEN];
971 /* XXX - remove this once constification is done */
974 if (!strcmp(fname, "-")) {
975 Parse_File("(stdin)", stdin);
976 Var_Set("MAKEFILE", "", VAR_GLOBAL);
978 setMAKEFILE = strcmp(fname, ".depend");
980 /* if we've chdir'd, rebuild the path name */
981 if (curdir != objdir && *fname != '/') {
982 snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
984 * XXX The realpath stuff breaks relative includes
985 * XXX in some cases. The problem likely is in
986 * XXX parse.c where it does special things in
987 * XXX ParseDoInclude if the file is relateive
988 * XXX or absolute and not a system file. There
989 * XXX it assumes that if the current file that's
990 * XXX being included is absolute, that any files
991 * XXX that it includes shouldn't do the -I path
992 * XXX stuff, which is inconsistant with historical
993 * XXX behavior. However, I can't pentrate the mists
994 * XXX further, so I'm putting this workaround in
995 * XXX here until such time as the underlying bug
998 #if THIS_BREAKS_THINGS
999 if (realpath(path, path) != NULL &&
1000 (stream = fopen(path, "r")) != NULL) {
1005 } else if (realpath(fname, path) != NULL) {
1008 if ((stream = fopen(fname, "r")) != NULL)
1012 if ((stream = fopen(path, "r")) != NULL) {
1019 if ((stream = fopen(fname, "r")) != NULL)
1023 /* look in -I and system include directories. */
1024 name = Path_FindFile(fname, &parseIncPath);
1026 name = Path_FindFile(fname, &sysIncPath);
1027 if (!name || !(stream = fopen(name, "r")))
1029 MAKEFILE = fname = name;
1031 * set the MAKEFILE variable desired by System V fans -- the
1032 * placement of the setting here means it gets set to the last
1033 * makefile specified, as it is set by SysV make.
1037 Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
1038 Parse_File(fname, stream);
1046 * exit with usage message
1051 fprintf(stderr, "%s\n%s\n%s\n",
1052 "usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
1053 " [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
1054 " [-m directory] [-V variable] [variable=value] [target ...]");