Add ifmedia(4) reference.

[dragonfly/netmp.git] / usr.bin / make / main.c

/*-
 * Copyright (c) 1988, 1989, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) Copyright (c) 1988, 1989, 1990, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)main.c   8.3 (Berkeley) 3/19/94
 * $FreeBSD: src/usr.bin/make/main.c,v 1.118 2005/02/13 13:33:56 harti Exp $
 * $DragonFly: src/usr.bin/make/main.c,v 1.146 2007/01/19 07:23:43 dillon Exp $
 */

/*
 * main.c
 *      The main file for this entire program. Exit routines etc
 *      reside here.
 *
 * Utility functions defined in this file:
 *      Main_ParseArgLine
 *                      Takes a line of arguments, breaks them and
 *                      treats them as if they were given when first
 *                      invoked. Used by the parse module to implement
 *                      the .MFLAGS target.
 */

#ifndef MACHINE
#include <sys/utsname.h>
#endif
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "arch.h"
#include "buf.h"
#include "config.h"
#include "dir.h"
#include "globals.h"
#include "job.h"
#include "make.h"
#include "parse.h"
#include "pathnames.h"
#include "shell.h"
#include "str.h"
#include "suff.h"
#include "targ.h"
#include "util.h"
#include "var.h"

extern char **environ;  /* XXX what header declares this variable? */

/*
 * DEFMAXJOBS
 *      This control the default concurrency. On no occasion will more
 *      than DEFMAXJOBS targets be created at once.
 */
#define DEFMAXJOBS      1

typedef struct CLI {
        /** ordered list of makefiles to read */
        Lst makefiles;

        /** list of variables to print */
        Lst variables;

        /** Targets to be made */
        Lst create;

        /** directories to search when looking for includes */
        struct Path     parseIncPath;

        /** directories to search when looking for system includes */
        struct Path     sysIncPath;

        bool    expandVars;     /* fully expand printed variables */
        bool    builtins;       /* -r flag */
        bool    forceJobs;      /* -j argument given */

        /**
         * -q flag:
         * true if we aren't supposed to really make anything, just
         * see if the targets are out-of-date
         */
        bool            queryFlag;
} CLI;

/* (-E) vars to override from env */
Lst envFirstVars = Lst_Initializer(envFirstVars);

bool            allPrecious;    /* .PRECIOUS given on line by itself */
bool            beSilent;       /* -s flag */
bool            beVerbose;      /* -v flag */
bool            compatMake;     /* -B argument */
int             debug;          /* -d flag */
bool            ignoreErrors;   /* -i flag */
int             jobLimit;       /* -j argument */
bool            jobsRunning;    /* true if the jobs might be running */
bool            keepgoing;      /* -k flag */
bool            noExecute;      /* -n flag */
bool            touchFlag;      /* -t flag */
bool            usePipes;       /* !-P flag */
uint32_t        warn_cmd;       /* command line warning flags */
uint32_t        warn_flags;     /* actual warning flags */
uint32_t        warn_nocmd;     /* command line no-warning flags */

time_t          now;            /* Time at start of make */
struct GNode    *DEFAULT;       /* .DEFAULT node */


/**
 * Exit with usage message.
 */
static void
usage(void)
{
        fprintf(stderr,
            "usage: make [-BPSXeiknqrstv] [-C directory] [-D variable]\n"
            "\t[-d flags] [-E variable] [-f makefile] [-I directory]\n"
            "\t[-j max_jobs] [-m directory] [-V variable]\n"
            "\t[variable=value] [target ...]\n");
        exit(2);
}

/**
 * MFLAGS_append
 *      Append a flag with an optional argument to MAKEFLAGS and MFLAGS
 */
static void
MFLAGS_append(const char *flag, char *arg)
{
        char *str;

        Var_Append(".MAKEFLAGS", flag, VAR_GLOBAL);
        if (arg != NULL) {
                str = MAKEFLAGS_quote(arg);
                Var_Append(".MAKEFLAGS", str, VAR_GLOBAL);
                free(str);
        }

        Var_Append("MFLAGS", flag, VAR_GLOBAL);
        if (arg != NULL) {
                str = MAKEFLAGS_quote(arg);
                Var_Append("MFLAGS", str, VAR_GLOBAL);
                free(str);
        }
}

/**
 * Open and parse the given makefile.
 *
 * Results:
 *      true if ok. false if couldn't open file.
 */
static bool
ReadMakefile(Parser *parser, CLI *cli, const char file[], const char curdir[], const char objdir[])
{
        char    path[MAXPATHLEN];
        FILE    *stream;
        char    *fname;
        char    *name;

        if (!strcmp(file, "-")) {
                Parse_File(parser, cli, "(stdin)", stdin);
                Var_SetGlobal("MAKEFILE", "");
                return (true);
        }

        if (strcmp(curdir, objdir) == 0 || file[0] == '/') {
                strcpy(path, file);
        } else {
                /*
                 * we've chdir'd, rebuild the path name
                 */
                snprintf(path, MAXPATHLEN, "%s/%s", curdir, file);
        }
#if THIS_BREAKS_THINGS
        /*
         * XXX The realpath stuff breaks relative includes
         * XXX in some cases.   The problem likely is in
         * XXX parse.c where it does special things in
         * XXX ParseDoInclude if the file is relateive
         * XXX or absolute and not a system file.  There
         * XXX it assumes that if the current file that's
         * XXX being included is absolute, that any files
         * XXX that it includes shouldn't do the -I path
         * XXX stuff, which is inconsistant with historical
         * XXX behavior.  However, I can't pentrate the mists
         * XXX further, so I'm putting this workaround in
         * XXX here until such time as the underlying bug
         * XXX can be fixed.
         */
        if (realpath(path, path) == NULL) {
                stream = NULL;
        } else {
                stream = fopen(path, "r");
        }
#else
        stream = fopen(path, "r");
#endif
        if (stream != NULL) {
                if (strcmp(file, ".depend") != 0)
                        Var_SetGlobal("MAKEFILE", file);
                Parse_File(parser, cli, path, stream);
                fclose(stream);
                return (true);
        }

        /* look in -I and system include directories. */
        fname = estrdup(file);
        name = NULL;
        if (name == NULL)
                name = Path_FindFile(fname, &cli->parseIncPath);
        if (name == NULL)
                name = Path_FindFile(fname, &cli->sysIncPath);

        if (name != NULL) {
                stream = fopen(name, "r");
                if (stream != NULL) {
                        /*
                         * set the MAKEFILE variable desired by System V fans
                         * -- the placement of the setting here means it gets
                         * set to the last makefile specified, as it is set
                         * by SysV make.
                         */
                        if (strcmp(file, ".depend") != 0)
                                Var_SetGlobal("MAKEFILE", name);
                        Parse_File(parser, cli, name, stream);
                        fclose(stream);
                        return (true);
                }
        }

        return (false); /* no makefile found */
}

/**
 * Read in the built-in rules first, followed by the specified
 * makefiles or the one of the default makefiles.  Finally .depend
 * makefile.
 */
static void
ReadInputFiles(Parser *parser, CLI *cli, const char curdir[], const char objdir[])
{
        if (cli->builtins) {
                char    defsysmk[] = PATH_DEFSYSMK;     /* Path of sys.mk */
                Lst     sysMkPath = Lst_Initializer(sysMkPath);
                LstNode *ln;

                Path_Expand(defsysmk, &cli->sysIncPath, &sysMkPath);
                if (Lst_IsEmpty(&sysMkPath))
                        Fatal("make: no system rules (%s).", PATH_DEFSYSMK);

                LST_FOREACH(ln, &sysMkPath) {
                        char *name = Lst_Datum(ln);
                        if (!ReadMakefile(parser, cli, name, curdir, objdir))
                                Fatal("make: cannot open %s.", name);
                }
                Lst_Destroy(&sysMkPath, free);
        }

        if (!Lst_IsEmpty(&cli->makefiles)) {
                LstNode *ln;

                LST_FOREACH(ln, &cli->makefiles) {
                        char *name = Lst_Datum(ln);
                        if (!ReadMakefile(parser, cli, name, curdir, objdir))
                                Fatal("make: cannot open %s.", name);
                }
        } else if (ReadMakefile(parser, cli, "BSDmakefile", curdir, objdir)) {
                /* read BSDmakefile */
        } else if (ReadMakefile(parser, cli, "makefile", curdir, objdir)) {
                /* read makefile */
        } else if (ReadMakefile(parser, cli, "Makefile", curdir, objdir)) {
                /* read Makefile */
        } else {
                /* No Makefile found */
        }

        ReadMakefile(parser, cli, ".depend", curdir, objdir);
}

/**
 * Main_ParseWarn
 *
 *      Handle argument to warning option.
 */
int
Main_ParseWarn(const char *arg, int iscmd)
{
        int i, neg;

        static const struct {
                const char      *option;
                uint32_t        flag;
        } options[] = {
                { "dirsyntax",  WARN_DIRSYNTAX },
                { NULL,         0 }
        };

        neg = 0;
        if (arg[0] == 'n' && arg[1] == 'o') {
                neg = 1;
                arg += 2;
        }

        for (i = 0; options[i].option != NULL; i++)
                if (strcmp(arg, options[i].option) == 0)
                        break;

        if (options[i].option == NULL)
                /* unknown option */
                return (-1);

        if (iscmd) {
                if (!neg) {
                        warn_cmd |= options[i].flag;
                        warn_nocmd &= ~options[i].flag;
                        warn_flags |= options[i].flag;
                } else {
                        warn_nocmd |= options[i].flag;
                        warn_cmd &= ~options[i].flag;
                        warn_flags &= ~options[i].flag;
                }
        } else {
                if (!neg) {
                        warn_flags |= (options[i].flag & ~warn_nocmd);
                } else {
                        warn_flags &= ~(options[i].flag | warn_cmd);
                }
        }
        return (0);
}

/**
 * MainParseArgs
 *      Parse a given argument vector. Called from main() and from
 *      Main_ParseArgLine() when the .MAKEFLAGS target is used.
 *
 *      XXX: Deal with command line overriding .MAKEFLAGS in makefile
 *
 * Side Effects:
 *      Various global and local flags will be set depending on the flags
 *      given
 */
static void
MainParseArgs(CLI *cli, int argc, char **argv)
{
        int c;
        bool    found_dd = false;

rearg:
        optind = 1;     /* since we're called more than once */
        optreset = 1;
#define OPTFLAGS "ABC:D:E:I:PSV:Xd:ef:ij:km:nqrstvx:"
        for (;;) {
                if ((optind < argc) && strcmp(argv[optind], "--") == 0) {
                        found_dd = true;
                }
                if ((c = getopt(argc, argv, OPTFLAGS)) == -1) {
                        break;
                }
                switch(c) {

                case 'A':
                        arch_fatal = false;
                        MFLAGS_append("-A", NULL);
                        break;
                case 'C':
                        if (chdir(optarg) == -1)
                                err(1, "chdir %s", optarg);
                        break;
                case 'D':
                        Var_SetGlobal(optarg, "1");
                        MFLAGS_append("-D", optarg);
                        break;
                case 'I':
                        Path_AddDir(&cli->parseIncPath, optarg);
                        MFLAGS_append("-I", optarg);
                        break;
                case 'V':
                        Lst_AtEnd(&cli->variables, estrdup(optarg));
                        MFLAGS_append("-V", optarg);
                        break;
                case 'X':
                        cli->expandVars = false;
                        break;
                case 'B':
                        compatMake = true;
                        MFLAGS_append("-B", NULL);
                        unsetenv("MAKE_JOBS_FIFO");
                        break;
                case 'P':
                        usePipes = false;
                        MFLAGS_append("-P", NULL);
                        break;
                case 'S':
                        keepgoing = false;
                        MFLAGS_append("-S", NULL);
                        break;
                case 'd': {
                        char *modules = optarg;

                        for (; *modules; ++modules)
                                switch (*modules) {
                                case 'A':
                                        debug = ~0;
                                        break;
                                case 'a':
                                        debug |= DEBUG_ARCH;
                                        break;
                                case 'c':
                                        debug |= DEBUG_COND;
                                        break;
                                case 'd':
                                        debug |= DEBUG_DIR;
                                        break;
                                case 'f':
                                        debug |= DEBUG_FOR;
                                        break;
                                case 'g':
                                        if (modules[1] == '1') {
                                                debug |= DEBUG_GRAPH1;
                                                ++modules;
                                        }
                                        else if (modules[1] == '2') {
                                                debug |= DEBUG_GRAPH2;
                                                ++modules;
                                        }
                                        break;
                                case 'j':
                                        debug |= DEBUG_JOB;
                                        break;
                                case 'l':
                                        debug |= DEBUG_LOUD;
                                        break;
                                case 'm':
                                        debug |= DEBUG_MAKE;
                                        break;
                                case 's':
                                        debug |= DEBUG_SUFF;
                                        break;
                                case 't':
                                        debug |= DEBUG_TARG;
                                        break;
                                case 'v':
                                        debug |= DEBUG_VAR;
                                        break;
                                default:
                                        warnx("illegal argument to d option "
                                            "-- %c", *modules);
                                        usage();
                                }
                        MFLAGS_append("-d", optarg);
                        break;
                }
                case 'E':
                        Lst_AtEnd(&envFirstVars, estrdup(optarg));
                        MFLAGS_append("-E", optarg);
                        break;
                case 'e':
                        checkEnvFirst = true;
                        MFLAGS_append("-e", NULL);
                        break;
                case 'f':
                        Lst_AtEnd(&cli->makefiles, estrdup(optarg));
                        break;
                case 'i':
                        ignoreErrors = true;
                        MFLAGS_append("-i", NULL);
                        break;
                case 'j': {
                        char *endptr;

                        cli->forceJobs = true;
                        jobLimit = strtol(optarg, &endptr, 10);
                        if (jobLimit <= 0 || *endptr != '\0') {
                                warnx("illegal number, -j argument -- %s",
                                    optarg);
                                usage();
                        }
                        MFLAGS_append("-j", optarg);
                        break;
                }
                case 'k':
                        keepgoing = true;
                        MFLAGS_append("-k", NULL);
                        break;
                case 'm':
                        Path_AddDir(&cli->sysIncPath, optarg);
                        MFLAGS_append("-m", optarg);
                        break;
                case 'n':
                        noExecute = true;
                        MFLAGS_append("-n", NULL);
                        break;
                case 'q':
                        cli->queryFlag = true;
                        /* Kind of nonsensical, wot? */
                        MFLAGS_append("-q", NULL);
                        break;
                case 'r':
                        cli->builtins = false;
                        MFLAGS_append("-r", NULL);
                        break;
                case 's':
                        beSilent = true;
                        MFLAGS_append("-s", NULL);
                        break;
                case 't':
                        touchFlag = true;
                        MFLAGS_append("-t", NULL);
                        break;
                case 'v':
                        beVerbose = true;
                        MFLAGS_append("-v", NULL);
                        break;
                case 'x':
                        if (Main_ParseWarn(optarg, 1) != -1)
                                MFLAGS_append("-x", optarg);
                        break;
                default:
                case '?':
                        usage();
                }
        }
        argv += optind;
        argc -= optind;

        oldVars = true;

        /*
         * Parse the rest of the arguments.
         *      o Check for variable assignments and perform them if so.
         *      o Check for more flags and restart getopt if so.
         *      o Anything else is taken to be a target and added
         *        to the end of the "create" list.
         */
        for (; *argv != NULL; ++argv, --argc) {
                if (Parse_IsVar(*argv)) {
                        char *ptr = MAKEFLAGS_quote(*argv);

                        Var_Append(".MAKEFLAGS", ptr, VAR_GLOBAL);
                        Parse_DoVar(*argv, VAR_CMD);
                        free(ptr);

                } else if ((*argv)[0] == '-') {
                        if ((*argv)[1] == '\0') {
                                /*
                                 * (*argv) is a single dash, so we
                                 * just ignore it.
                                 */
                        } else if (found_dd) {
                                /*
                                 * Double dash has been found, ignore
                                 * any more options.  But what do we do
                                 * with it?  For now treat it like a target.
                                 */
                                Lst_AtEnd(&cli->create, estrdup(*argv));
                        } else {
                                /*
                                 * (*argv) is a -flag, so backup argv and
                                 * argc.  getopt() expects options to start
                                 * in the 2nd position.
                                 */
                                argc++;
                                argv--;
                                goto rearg;
                        }

                } else if ((*argv)[0] == '\0') {
                        Punt("illegal (null) argument.");

                } else {
                        Lst_AtEnd(&cli->create, estrdup(*argv));
                }
        }
}

/**
 * Main_ParseArgLine
 *      Used by the parse module when a .MFLAGS or .MAKEFLAGS target
 *      is encountered and by main() when reading the .MAKEFLAGS envariable.
 *      Takes a line of arguments and breaks it into its
 *      component words and passes those words and the number of them to the
 *      MainParseArgs function.
 *      The line should have all its leading whitespace removed.
 *
 * Side Effects:
 *      Only those that come from the various arguments.
 */
void
Main_ParseArgLine(CLI *cli, const char line[], int mflags)
{
        ArgArray        aa;

        if (mflags) {
                MAKEFLAGS_break(&aa, line);
        } else {
                brk_string(&aa, line, true);
        }
        MainParseArgs(cli, aa.argc, aa.argv);
        ArgArray_Done(&aa);
}

/**
 * Try to change the current working directory to path, and return
 * the whole path using getcwd().
 *
 * @note for amd managed mount points we really should use pawd(1).
 */
static int
CheckDir(const char path[], char newdir[])
{
        struct stat sb;

        /*
         * Check if the path is a directory.  If not fail without reporting
         * an error.
         */
        if (stat(path, &sb) < 0) {
                return (0);
        }
        if (S_ISDIR(sb.st_mode) == 0) {
                return (0);
        }

        /*
         * The path refers to a directory, so we try to change into it. If we
         * fail, or we fail to obtain the path from root to the directory,
         * then report an error and fail.
         */
        if (chdir(path) < 0) {
                warn("warning: %s", path);
                return (0);
        }
        if (getcwd(newdir, MAXPATHLEN) == NULL) {
                warn("warning: %s", path);
                return (0);
        }

        /*
         * Directory in path is accessable, newdir should now contain the
         * path to it.
         */
        return (1);
}

/**
 * Determine location of the object directory.
 */
static void
FindObjDir(const char machine[], char curdir[], char objdir[])
{
        struct stat     sa;
        char            newdir[MAXPATHLEN];
        char            mdpath[MAXPATHLEN];
        const char      *env;

        /*
         * Find a path to where we are... [-C directory] might have changed
         * our current directory.
         */
        if (getcwd(curdir, MAXPATHLEN) == NULL)
                err(2, NULL);

        if (stat(curdir, &sa) == -1)
                err(2, "%s", curdir);

        /*
         * The object directory location is determined using the
         * following order of preference:
         *
         *      1. MAKEOBJDIRPREFIX`cwd`
         *      2. MAKEOBJDIR
         *      3. PATH_OBJDIR.${MACHINE}
         *      4. PATH_OBJDIR
         *      5. PATH_OBJDIRPREFIX`cwd`
         *
         * If one of the first two fails, use the current directory.
         * If the remaining three all fail, use the current directory.
         */
        if ((env = getenv("MAKEOBJDIRPREFIX")) != NULL) {
                snprintf(mdpath, MAXPATHLEN, "%s%s", env, curdir);
                if (CheckDir(mdpath, newdir)) {
                        strcpy(objdir, newdir);
                        return;
                }
                strcpy(objdir, curdir);
                return;
        }

        if ((env = getenv("MAKEOBJDIR")) != NULL) {
                if (CheckDir(env, newdir)) {
                        strcpy(objdir, newdir);
                        return;
                }
                strcpy(objdir, curdir);
                return;
        }

        snprintf(mdpath, MAXPATHLEN, "%s.%s", PATH_OBJDIR, machine);
        if (CheckDir(mdpath, newdir)) {
                strcpy(objdir, newdir);
                return;
        }

        if (CheckDir(PATH_OBJDIR, newdir)) {
                strcpy(objdir, newdir);
                return;
        }

        snprintf(mdpath, MAXPATHLEN, "%s%s", PATH_OBJDIRPREFIX, curdir);
        if (CheckDir(mdpath, newdir)) {
                strcpy(objdir, newdir);
                return;
        }

        strcpy(objdir, curdir);
}

/**
 * Initialize various make variables.
 *      MAKE also gets this name, for compatibility
 *      .MAKEFLAGS gets set to the empty string just in case.
 *      MFLAGS also gets initialized empty, for compatibility.
 */
static void
InitVariables(const char progname[])
{
        const char      *machine_platform;
        const char      *machine_arch;
        const char      *machine;
        char buf[256];
        size_t bufsiz;

        Var_SetGlobal("MAKE", progname);
        Var_SetGlobal(".MAKEFLAGS", "");
        Var_SetGlobal("MFLAGS", "");

        Var_SetGlobal(".DIRECTIVE_MAKEENV", "YES");
        Var_SetGlobal(".ST_EXPORTVAR", "YES");
#ifdef MAKE_VERSION
        Var_SetGlobal("MAKE_VERSION", MAKE_VERSION);
#endif

        /*
         * The make program defines MACHINE_PLATFORM, MACHINE and MACHINE_ARCH.
         * These parameters are taken from the running system but can be
         * overridden by environment variables.
         *
         * MACHINE_PLATFORM     
         *              - This is the platform, e.g. "vkernel", "pc32", 
         *                and so forth.
         *
         * MACHINE      - This is the machine architecture and in most
         *                cases is the same as the cpu architecture.
         *
         * MACHINE_ARCH - This is the cpu architecture, for example "i386".
         *                Several different platforms may use the same
         *                cpu architecture.
         *
         * In most, but not all cases, MACHINE == MACHINE_ARCH.
         *
         * PLATFORM distinguishes differences between, say, a virtual kernel
         * build and a real kernel build.
         */
        if ((machine_platform = getenv("MACHINE_PLATFORM")) == NULL) {
                bufsiz = sizeof(buf);
                if (sysctlbyname("hw.platform", buf, &bufsiz, NULL, 0) < 0)
                        machine_platform = "unknown";
                else
                        machine_platform = strdup(buf);
        }

        if ((machine = getenv("MACHINE")) == NULL) {
                bufsiz = sizeof(buf);
                if (sysctlbyname("hw.machine", buf, &bufsiz, NULL, 0) < 0)
                        machine = "unknown";
                else
                        machine = strdup(buf);
        }

        if ((machine_arch = getenv("MACHINE_ARCH")) == NULL) {
                bufsiz = sizeof(buf);
                if (sysctlbyname("hw.machine_arch", buf, &bufsiz, NULL, 0) < 0)
                        machine_arch = "unknown";
                else
                        machine_arch = strdup(buf);
        }

        Var_SetGlobal("MACHINE_PLATFORM", machine_platform);
        Var_SetGlobal("MACHINE", machine);
        Var_SetGlobal("MACHINE_ARCH", machine_arch);
}

/**
 * Build targets given in the command line or if none were given
 * use the main target determined by the parsing module.
 */
static int
BuildStuff(CLI *cli)
{
        int     status;
        Lst     targs = Lst_Initializer(targs);

        if (Lst_IsEmpty(&cli->create))
                Parse_MainName(&targs);
        else
                Targ_FindList(&targs, &cli->create, TARG_CREATE);

        /* Traverse the graph, checking on all the targets */
        if (compatMake) {
                Sig_Init(true);
                status = Compat_Run(&targs, cli->queryFlag);
        } else {
                Sig_Init(false);
                status = Make_Run(&targs, cli->queryFlag);
        }

        Lst_Destroy(&targs, NOFREE);
        return (status);
}

/**
 * main
 *      The main function, for obvious reasons. Initializes variables
 *      and a few modules, then parses the arguments give it in the
 *      environment and on the command line. Reads the system makefile
 *      followed by either Makefile, makefile or the file given by the
 *      -f argument. Sets the .MAKEFLAGS PMake variable based on all the
 *      flags it has received by then uses either the Make or the Compat
 *      module to create the initial list of targets.
 *
 * Results:
 *      If -q was given, exits -1 if anything was out-of-date. Else it exits
 *      0.
 *
 * Side Effects:
 *      The program exits when done. Targets are created. etc. etc. etc.
 */
int
main(int argc, char **argv)
{
        CLI             cli;
        Parser          parser;
        Shell           *shell;
        int             status;         /* exit status */
        char            curdir[MAXPATHLEN];     /* startup directory */
        char            objdir[MAXPATHLEN];     /* where we chdir'ed to */
        const char      *make_flags;

        /*------------------------------------------------------------*
         * This section initializes stuff that require no input.
         *------------------------------------------------------------*/
        /*
         * Initialize program globals.
         */
        beSilent = false;               /* Print commands as executed */
        ignoreErrors = false;           /* Pay attention to non-zero returns */
        noExecute = false;              /* Execute all commands */
        keepgoing = false;              /* Stop on error */
        allPrecious = false;            /* Remove targets when interrupted */
        touchFlag = false;              /* Actually update targets */
        usePipes = true;                /* Catch child output in pipes */
        debug = 0;                      /* No debug verbosity, please. */
        jobsRunning = false;

        jobLimit = DEFMAXJOBS;
        compatMake = false;             /* No compat mode */

        /*
         * Initialize program flags.
         */
        Lst_Init(&cli.makefiles);
        Lst_Init(&cli.variables);
        Lst_Init(&cli.create);
        TAILQ_INIT(&cli.parseIncPath);
        TAILQ_INIT(&cli.sysIncPath);

        cli.expandVars = true;
        cli.builtins = true;            /* Read the built-in rules */
        cli.queryFlag = false;
        cli.forceJobs = false;

        shell = Shell_Match(DEFSHELLNAME);

        /*
         * Initialize the various modules.
         */
        Proc_Init();
        commandShell = shell;
        Targ_Init();
        Suff_Init();
        Dir_Init();

        /*------------------------------------------------------------*
         * This section initializes stuff that depend on things
         * in the enviornment, command line, or a input file.
         *------------------------------------------------------------*/
        Var_Init(environ);

        InitVariables(argv[0]);

        /*
         * First snag things out of the MAKEFLAGS environment
         * variable.  Then parse the command line arguments.
         */
        if ((make_flags = getenv("MAKEFLAGS")) != NULL) {
                Main_ParseArgLine(&cli, make_flags, 1);
        }
        MainParseArgs(&cli, argc, argv);

        FindObjDir(Var_Value("MACHINE", VAR_GLOBAL), curdir, objdir);
        Var_SetGlobal(".CURDIR", curdir);
        Var_SetGlobal(".OBJDIR", objdir);

        /*
         * Set up the .TARGETS variable to contain the list of targets to be
         * created. If none specified, make the variable empty -- the parser
         * will fill the thing in with the default or .MAIN target.
         */
        if (Lst_IsEmpty(&cli.create)) {
                Var_SetGlobal(".TARGETS", "");
        } else {
                LstNode *ln;

                LST_FOREACH(ln, &cli.create) {
                        char *name = Lst_Datum(ln);

                        Var_Append(".TARGETS", name, VAR_GLOBAL);
                }
        }

        Dir_CurObj(curdir, objdir);

        /*
         * If no user-supplied system path was given (through the -m option)
         * add the directories from the DEFSYSPATH (more than one may be given
         * as dir1:...:dirn) to the system include path.
         */
        if (TAILQ_EMPTY(&cli.sysIncPath)) {
                char syspath[] = PATH_DEFSYSPATH;
                char *start = syspath;
                char *cp;

                while ((cp = strsep(&start, ":")) != NULL) {
                        Path_AddDir(&cli.sysIncPath, cp);
                }
        }

        if (getenv("MAKE_JOBS_FIFO") != NULL)
                cli.forceJobs = true;

        /*
         * Be compatible if user did not specify -j and did not explicitly
         * turned compatibility on
         */
        if (compatMake == false && cli.forceJobs == false)
                compatMake = true;

        DEFAULT = NULL;
        time(&now);

        parser.create = &cli.create;
        parser.parseIncPath = &cli.parseIncPath;
        parser.sysIncPath = &cli.sysIncPath;

        ReadInputFiles(&parser, &cli, curdir, objdir);

        /*------------------------------------------------------------*
         * We are finished processing inputs.
         *------------------------------------------------------------*/

        /* Install all the flags into the MAKE envariable. */
        {
                const char *p;

                p = Var_Value(".MAKEFLAGS", VAR_GLOBAL);
                if (p != NULL && *p != '\0') {
                        if (setenv("MAKEFLAGS", p, 1) == -1)
                                Punt("setenv: MAKEFLAGS: can't allocate memory");
                }
        }

        /*
         * For compatibility, look at the directories in the VPATH variable
         * and add them to the search path, if the variable is defined. The
         * variable's value is in the same format as the PATH envariable, i.e.
         * <directory>:<directory>:<directory>...
         */
        if (Var_Value("VPATH", VAR_CMD) != NULL) {
                Buffer  *buf = Var_Subst("${VPATH}", VAR_CMD, false);
                char    *start = Buf_Data(buf);
                char    *cp;

                while ((cp = strsep(&start, ":")) != NULL) {
                        Path_AddDir(&dirSearchPath, cp);
                }

                Buf_Destroy(buf, true);
        }

        /*
         * Now that all search paths have been read for suffixes et al, it's
         * time to add the default search path to their lists...
         */
        Suff_DoPaths();

        /* print the initial graph, if the user requested it */
        if (DEBUG(GRAPH1))
                Targ_PrintGraph(1);

        if (Lst_IsEmpty(&cli.variables)) {
                status = BuildStuff(&cli);
        } else {
                /* Print the values of variables requested by the user. */
                Var_Print(&cli.variables, cli.expandVars);

                /*
                 * XXX
                 * This should be a "don't care", we do not check
                 * the status of any files.  It might make sense to
                 * modify Var_Print() to indicate that one of the
                 * requested variables did not exist, and use that
                 * as the return status.
                 * XXX
                 */
                status = cli.queryFlag ? 1 : 0;
        }

        /* print the graph now it's been processed if the user requested it */
        if (DEBUG(GRAPH2))
                Targ_PrintGraph(2);

#if 0
        TAILQ_DESTROY(&cli.sysIncPath);
        TAILQ_DESTROY(&cli.parseIncPath);
#endif
        Lst_Destroy(&cli.create, free);
        Lst_Destroy(&cli.variables, free);
        Lst_Destroy(&cli.makefiles, free);

        return (status);
}