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Annotation of src/BUILDING, Revision 1.25

1.1       tv          1: BUILDING(8)             NetBSD System Manager's Manual             BUILDING(8)
                      2:
                      3: NAME
                      4:      BUILDING - Procedure for building NetBSD from source code.
                      5:
                      6: STATUS
                      7:      This document is a work-in-progress.  As such, the information described
                      8:      here may not match the reality of the build system as of this writing.
                      9:      Once this document is completely in sync with reality, this paragraph
                     10:      will be removed.
                     11:
                     12:      Discrepancies between this documentation and the current reality of im-
                     13:      plementation are noted specially, as with the note below:
                     14:
                     15:      Note: This document applies only to platforms which use the new toolchain
1.15      lukem      16:      as indicated by the default setting of TOOLCHAIN_MISSING in <bsd.own.mk>.
1.5       tv         17:      Platforms which have not yet been switched to the new toolchain should
                     18:      continue building traditionally, using the notes specified in the file
                     19:      UPDATING.
1.1       tv         20:
                     21: REQUIREMENTS
                     22:      NetBSD is designed to be buildable on most POSIX-compliant host systems.
                     23:      The basic build procedure is the same whether compiling natively (on the
                     24:      same NetBSD architecture) or cross compiling (on another architecture or
                     25:      OS).
                     26:
                     27:      This source tree contains a special subtree, ``tools'', which uses the
                     28:      host system to create a build toolchain for the target architecture.  The
                     29:      host system must have at least C and C++ compilers in order to create the
                     30:      toolchain (make is not required); all other tools are created as part of
                     31:      the NetBSD build process.
                     32:
1.22      lukem      33:            Note: A couple of host toolchain components are not yet available
                     34:            in the tools directory.  Also, some tools use non-POSIX, non-ANSI C
1.1       tv         35:            extensions and need to be standardized.  As a result, cross-compil-
                     36:            ing from systems other than NetBSD is not currently supported.
                     37:
                     38: FILES
                     39:    Source tree layout
                     40:
1.17      wiz        41:      doc/BUILDING.mdoc
                     42:                     This document (in -mdoc troff format; the original copy).
1.1       tv         43:
1.2       wiz        44:      BUILDING       This document (in plaintext).
1.1       tv         45:
                     46:      Makefile       The main Makefile for NetBSD; should only be run for na-
                     47:                     tive builds with an appropriately up-to-date version of
                     48:                     NetBSD make(1).  (For building from out-of-date systems or
                     49:                     on a non-native host, see the build.sh shell script.)
                     50:
                     51:      UPDATING       Special notes for updating from an earlier revision of
                     52:                     NetBSD.  It is important to read this file before every
                     53:                     build of an updated source tree.
                     54:
                     55:      build.sh       Bourne-compatible shell script used for building the host
                     56:                     build tools and the NetBSD system from scratch.  Can be
                     57:                     used for both native and cross builds, and should be used
                     58:                     instead of make(1) for any source tree that is updated and
                     59:                     recompiled regularly.
                     60:
                     61:      crypto/dist/, dist/, gnu/dist/
                     62:                     Sources imported verbatim from third parties, without man-
                     63:                     gling the existing build structure.  Other source trees in
                     64:                     bin through usr.sbin use the NetBSD make(1) ``reachover''
                     65:                     Makefile semantics when building these programs for a na-
                     66:                     tive host.
                     67:
                     68:      distrib/, etc/
                     69:                     Sources for items used when making a full release snap-
                     70:                     shot, such as files installed in /etc on the destination
                     71:                     system, boot media, and release notes.
                     72:
                     73:      regress/       Regression test harness.  Can be cross-compiled, but only
                     74:                     run natively.
                     75:
                     76:      sys/           NetBSD kernel sources.
                     77:
                     78:      tools/         ``Reachover'' build structure for the host build tools.
                     79:                     This has a special method of determining out-of-date sta-
                     80:                     tus.
                     81:
                     82:      bin/ ... usr.sbin/
                     83:                     Sources to the NetBSD userland (non-kernel) programs.  If
                     84:                     any of these directories are missing, they will be skipped
                     85:                     during the build.
                     86:
                     87:    Build tree layout
                     88:      The NetBSD build tree is described in hier(7), and the release layout is
                     89:      described in release(7).
                     90:
                     91: CONFIGURATION
1.8       lukem      92:    Environment variables
                     93:      Several environment variables control the behaviour of NetBSD builds.
                     94:
                     95:      MACHINE           Machine type.
                     96:
                     97:      MACHINE_ARCH      Machine architecture.
                     98:
                     99:      MAKE              Path name to invoke make(1) as.
                    100:
                    101:      MAKEFLAGS         Flags to invoke make(1) with.
                    102:
                    103:      MAKEOBJDIR        Directory to use as the .OBJDIR for the current direc-
                    104:                        tory.  Used only if MAKEOBJDIRPREFIX is not defined.
                    105:                        MAKEOBJDIR can only be provided in the environment.
                    106:
                    107:      MAKEOBJDIRPREFIX  Top level directory of the object directory tree.  If
                    108:                        this is defined, ${MAKEOBJDIRPREFIX}/${.CURDIR} is used
                    109:                        as the .OBJDIR for the current directory.  The current
                    110:                        directory may be read only.  MAKEOBJDIRPREFIX can only
                    111:                        be provided in the environment.
                    112:
1.1       tv        113:    "make" variables
                    114:      Several variables control the behavior of NetBSD builds.  Unless other-
                    115:      wise specified, these variables may be set in either the process environ-
                    116:      ment or the make(1) configuration file specified by MAKECONF.
                    117:
1.9       thorpej   118:      BUILDID     Identifier for the build.  The identifier will be appended to
                    119:                  object directory names, and can be consulted in the make(1)
                    120:                  configuration file in order to set additional build parame-
                    121:                  ters, such as compiler flags.
                    122:
1.1       tv        123:      DESTDIR     Directory to contain the built NetBSD system.  If set, spe-
                    124:                  cial options are passed to the compilation tools to prevent
                    125:                  their default use of the host system's /usr/include,
                    126:                  /usr/lib, and so forth.  This pathname should not end with a
                    127:                  slash (/) character (for installation into the system's root
1.7       lukem     128:                  directory, set DESTDIR to an empty string).  The directory
                    129:                  must reside on a file system which supports long file names
                    130:                  and hard links.
1.1       tv        131:
                    132:                  Default: Empty string if USETOOLS is ``yes''; unset other-
                    133:                  wise.
                    134:
                    135:      MAKECONF    The name of the make(1) configuration file.  Only settable in
                    136:                  the process environment.
                    137:
                    138:                  Default: ``/etc/mk.conf''
                    139:
                    140:      MKCATPAGES  Can be set to ``yes'' or ``no''.  Indicates whether prefor-
                    141:                  matted plaintext manual pages will be created during a build.
                    142:
                    143:                  Default: ``yes''
                    144:
                    145:      MKCRYPTO    Can be set to ``yes'' or ``no''.  Indicates whether crypto-
                    146:                  graphic code will be included in a build; provided for the
                    147:                  benefit of countries that do not allow strong cryptography.
                    148:                  Will not affect use of the standard low-security password en-
                    149:                  cryption system, crypt(3).
                    150:
                    151:                  Default: ``yes''
                    152:
                    153:      MKDOC       Can be set to ``yes'' or ``no''.  Indicates whether system
                    154:                  documentation destined for /usr/share/doc will be installed
                    155:                  during a build.
                    156:
                    157:                  Default: ``yes''
                    158:
1.4       tv        159:      MKHOSTOBJ   Can be set to ``yes'' or ``no''.  If set to ``yes'', then for
                    160:                  programs intended to be run on the compile host, the name,
                    161:                  release, and architecture of the host operating system will
                    162:                  be suffixed to the name of the object directory created by
                    163:                  ``make obj''.  (This allows multiple host systems to compile
                    164:                  NetBSD for a single target.)  If set to ``no'', then programs
                    165:                  built to be run on the compile host will use the same object
                    166:                  directory names as programs built to be run on the target.
                    167:
                    168:                  Default: ``no''
                    169:
1.1       tv        170:      MKINFO      Can be set to ``yes'' or ``no''.  Indicates whether GNU Info
                    171:                  files, used for the documentation for most of the compilation
                    172:                  tools, will be created and installed during a build.
                    173:
                    174:                  Default: ``yes''
                    175:
                    176:      MKLINT      Can be set to ``yes'' or ``no''.  Indicates whether lint(1)
                    177:                  will be run against portions of the NetBSD source code during
                    178:                  the build, and whether lint libraries will be installed into
                    179:                  /usr/libdata/lint.
                    180:
                    181:                  Default: ``yes''
                    182:
                    183:      MKMAN       Can be set to ``yes'' or ``no''.  Indicates whether manual
                    184:                  pages will be installed during a build.
                    185:
                    186:                  Default: ``yes''
                    187:
                    188:      MKNLS       Can be set to ``yes'' or ``no''.  Indicates whether Native
                    189:                  Language System locale zone files will be compiled and in-
                    190:                  stalled during a build.
                    191:
                    192:                  Default: ``yes''
                    193:
                    194:      MKOBJ       Can be set to ``yes'' or ``no''.  Indicates whether object
                    195:                  directories will be created when running ``make obj''.  If
                    196:                  set to ``no'', then all built files will be located inside
                    197:                  the regular source tree.
                    198:
                    199:                  Default: ``yes''
                    200:
                    201:      MKPIC       Can be set to ``yes'' or ``no''.  Indicates whether shared
                    202:                  objects and libraries will be created and installed during a
                    203:                  build.  If set to ``no'', the entire built system will be
                    204:                  statically linked.
                    205:
                    206:                  Default: Platform dependent.  As of this writing, all plat-
                    207:                  forms except sh3 default to ``yes''.
                    208:
                    209:      MKPICINSTALL
                    210:                  Can be set to ``yes'' or ``no''.  Indicates whether the ar(1)
                    211:                  format libraries (lib*_pic.a), used to generate shared li-
                    212:                  braries, are installed during a build.
                    213:
                    214:                  Default: ``yes''
                    215:
                    216:      MKPROFILE   Can be set to ``yes'' or ``no''.  Indicates whether profiled
                    217:                  libraries (lib*_p.a) will be built and installed during a
                    218:                  build.
                    219:
                    220:                  Default: ``yes''; however, some platforms turn off MKPROFILE
                    221:                  by default at times due to toolchain problems with profiled
                    222:                  code.
                    223:
                    224:      MKSHARE     Can be set to ``yes'' or ``no''.  Indicates whether files
                    225:                  destined to reside in /usr/share will be built and installed
                    226:                  during a build.  If set to ``no'', then all of MKCATPAGES,
                    227:                  MKDOC, MKINFO, MKMAN, and MKNLS will be set to ``no'' uncon-
                    228:                  ditionally.
                    229:
                    230:                  Default: ``yes''
                    231:
                    232:      TOOLDIR     Directory to hold the host tools, once built.  This directory
                    233:                  should be unique to a given host system and NetBSD source
                    234:                  tree.  (However, multiple targets may share the same TOOLDIR;
                    235:                  the target-dependent files have unique names.)  If unset, a
                    236:                  default based on the uname(1) information of the host plat-
                    237:                  form will be created in the .OBJDIR of src/tools.
                    238:
                    239:                  Default: Unset.
                    240:
1.7       lukem     241:      UNPRIVED    If set, then an unprivileged install will occur.  The user,
                    242:                  group, permissions, and file flags, will not be set on the
                    243:                  installed item; instead the information will be appended to a
1.11      lukem     244:                  file called METALOG in DESTDIR.  The contents of METALOG is
                    245:                  used during the generation of the distribution tar files to
                    246:                  ensure that the appropriate file ownership is stored.
1.7       lukem     247:
                    248:                  Default: Unset.
                    249:
1.1       tv        250:      UPDATE      If set, then all install operations intended to write to
                    251:                  DESTDIR will compare file timestamps before installing, and
                    252:                  skip the install phase if the destination files are up-to-
                    253:                  date.  This also has implications on full builds (see next
                    254:                  subsection).
                    255:
                    256:                  Default: Unset.
                    257:
                    258:      USETOOLS    Indicates whether the tools specified by TOOLDIR should be
                    259:                  used as part of a build in progress.  Must be set to ``yes''
                    260:                  if cross-compiling.
                    261:
                    262:                  yes    Use the tools from TOOLDIR.
                    263:
                    264:                  no     Do not use the tools from TOOLDIR, but refuse to build
                    265:                         native compilation tool components that are version-
                    266:                         specific for that tool.
                    267:
                    268:                  never  Do not use the tools from TOOLDIR, even when building
                    269:                         native tool components.  This is similar to the tradi-
                    270:                         tional NetBSD build method, but does not verify that
                    271:                         the compilation tools in use are up-to-date enough in
                    272:                         order to build the tree successfully.  This may cause
                    273:                         build or runtime problems when building the whole
                    274:                         NetBSD source tree.
                    275:
                    276:                  Default: ``yes'' if building all or part of a whole NetBSD
                    277:                  source tree (detected automatically); ``no'' otherwise (to
                    278:                  preserve traditional semantics of the <bsd.*.mk> make(1) in-
                    279:                  clude files).
                    280:
                    281:    "make" variables for full builds
1.7       lukem     282:      These variables only affect the top level ``Makefile'' and do not affect
                    283:      manually building subtrees of the NetBSD source code.
1.1       tv        284:
1.20      lukem     285:      INSTALLWORLDDIR  Location for the ``make installworld'' target to install
                    286:                       to.
1.1       tv        287:
1.20      lukem     288:                       Default: ``/''
1.1       tv        289:
1.20      lukem     290:      MKOBJDIRS        Can be set to ``yes'' or ``no''.  Indicates whether ob-
                    291:                       ject directories will be created automatically (via a
                    292:                       ``make obj'' pass) at the start of a build.
1.1       tv        293:
1.20      lukem     294:                       Default: ``yes''
1.1       tv        295:
1.20      lukem     296:      NBUILDJOBS       Now obsolete.  Use the make(1) option -j, instead (see
                    297:                       below)
1.1       tv        298:
1.20      lukem     299:                       Default: Unset.
1.1       tv        300:
1.20      lukem     301:      NOCLEANDIR       If set, avoids the ``make cleandir'' phase of a full
                    302:                       build.  This has the effect of allowing only changed
                    303:                       files in a source tree to be recompiled.  This can speed
                    304:                       up builds when updating only a few files in the tree.
1.1       tv        305:
1.20      lukem     306:                       Default: Unset.
1.1       tv        307:
1.20      lukem     308:      NODISTRIBDIRS    If set, avoids the ``make distrib-dirs'' phase of a full
                    309:                       build.  This skips running mtree(8) on DESTDIR, useful
                    310:                       on systems where building as an unprivileged user, or
                    311:                       where it is known that the system-wide mtree files have
                    312:                       not changed.
1.1       tv        313:
1.20      lukem     314:                       Default: Unset.
1.1       tv        315:
1.20      lukem     316:      NOINCLUDES       If set, avoids the ``make includes'' phase of a full
                    317:                       build.  This has the effect of preventing make(1) from
                    318:                       thinking that some programs are out-of-date simply be-
                    319:                       cause the system include files have changed.  However,
                    320:                       this option should not be used when updating the entire
                    321:                       NetBSD source tree arbitrarily; it is suggested to use
                    322:                       UPDATE in that case.
1.1       tv        323:
1.20      lukem     324:                       Default: Unset.
1.1       tv        325:
1.20      lukem     326:      RELEASEDIR       If set, specifies the directory to which a release(7)
                    327:                       layout will be written at the end of a ``make release''.
                    328:
                    329:                       Default: Unset.
                    330:
                    331:      UPDATE           If set, then in addition to the effects described for
                    332:                       UPDATE above, this implies the effects of NOCLEANDIR.
1.1       tv        333:
                    334: BUILDING
                    335:    "make" command line options
                    336:      This is only a summary of options available to make(1); only the options
                    337:      used most frequently with NetBSD builds are listed here.
                    338:
1.10      sommerfe  339:      -j njob    Run up to njob make(1) subjobs in parallel.  Makefiles should
                    340:                 use .WAIT or have explicit dependancies as necessary to en-
                    341:                 force build ordering.  If you see build failures with -j,
                    342:                 please save complete build logs so the failures can be ana-
                    343:                 lyzed.
                    344:
1.1       tv        345:      -m dir     Specify the default directory for searching for system Make-
                    346:                 file segments, mainly the <bsd.*.mk> files.  When building any
                    347:                 full NetBSD source tree, this should be set to the
                    348:                 ``share/mk'' directory in the source tree.  (This is set auto-
                    349:                 matically when building from the top level.)
                    350:
                    351:      -n         Display the commands that would have been executed, but do not
                    352:                 actually execute them.  This will still cause recursion to
                    353:                 take place.
                    354:
                    355:      -v var     Print make(1)'s idea of the value of var.  Does not build any
                    356:                 targets.
                    357:
                    358:      var=value  Set the variable var to value, overriding any setting speci-
                    359:                 fied by the process environment, the MAKECONF configuration
                    360:                 file, or the system Makefile segments.
                    361:
                    362:    "make" targets
                    363:      These default targets may be built by running make(1) in any subtree of
                    364:      the NetBSD source code.  It is recommended that none of these be used
                    365:      from the top level Makefile; as a specific exception, ``make obj'' and
                    366:      ``make cleandir'' are useful in that context.
                    367:
                    368:      all        Build programs, libraries, and preformatted documentation.
                    369:
                    370:      clean      Remove program and library object code files.
                    371:
                    372:      cleandir   Same as clean, but also remove preformatted documentation, de-
                    373:                 pendency files generated by ``make depend'', and any other
                    374:                 files known to be created at build time.  ``make distclean''
                    375:                 may be used as a synonym, for familiarity with a similar well-
                    376:                 known convention.
                    377:
                    378:      depend     Create dependency files (.depend) containing more detailed in-
                    379:                 formation about the dependencies of source code on header
                    380:                 files.  Allows programs to be recompiled automatically when a
                    381:                 dependency changes.
                    382:
                    383:      dependall  Does a ``make depend'' immediately followed by a ``make all''.
1.10      sommerfe  384:                 This improves cache locality of the build since both passes
                    385:                 read the source files in their entirety.
1.1       tv        386:
                    387:      includes   Build and install system header files.  Typically needed be-
                    388:                 fore any system libraries or programs can be built.
                    389:
                    390:      install    Install programs, libraries, and documentation into DESTDIR.
1.14      fredb     391:                 Few files will be installed to /dev, /etc, /root or /var in
                    392:                 order to prevent user supplied configuration data from being
                    393:                 overwritten.
1.1       tv        394:
                    395:      lint       Run lint(1) against the C source code, where appropriate, and
                    396:                 generate system-installed lint libraries.
                    397:
                    398:      obj        Create object directories to be used for built files, instead
                    399:                 of building directly in the source tree.
                    400:
                    401:      tags       Create ctags(1) searchable function lists usable by the ex(1)
                    402:                 and vi(1) text editors.
                    403:
                    404:    "make" targets for the top level
                    405:      Additional make(1) targets are usable specifically from the top source
                    406:      level to facilitate building the entire NetBSD source tree.
                    407:
1.20      lukem     408:      build         Build the entire NetBSD system.  This orders portions of
                    409:                    the source tree such that prerequisites will be built in
                    410:                    the proper order.
                    411:
                    412:      distribution  Do a ``make build'', and then install a full distribution
1.22      lukem     413:                    into DESTDIR, including files in /dev, /etc, /root and
                    414:                    /var.
1.20      lukem     415:
                    416:      buildworld    As per ``make distribution'', except that it ensures that
                    417:                    DESTDIR is not the root directory.
                    418:
                    419:      installworld  Install the distribution from DESTDIR to INSTALLWORLDDIR
                    420:                    (which defaults to the root directory).  Ensures that
                    421:                    INSTALLWORLDDIR is the not root directory if cross compil-
                    422:                    ing.
                    423:
                    424:                    Note: It is highly recommended that you upgrade your kernel
                    425:                    and reboot before performing this operation.
                    426:
1.25    ! lukem     427:      sets          Create distribution sets from DESTDIR into
        !           428:                    RELEASEDIR/MACHINE/binary/sets.  Should be run after ``make
        !           429:                    distribution'' (as ``make build'' does not install all of
        !           430:                    the required files).
        !           431:
1.22      lukem     432:      release       Do a ``make distribution'', build kernels, distribution me-
1.25    ! lukem     433:                    dia, and install sets (this as per ``make sets''), and then
        !           434:                    package the system into a standard release layout as de-
        !           435:                    scribed by release(7).  This requires that RELEASEDIR be
        !           436:                    set (see above).
1.1       tv        437:
                    438:      regression-tests
1.20      lukem     439:                    Can only be run after building the regression tests in the
                    440:                    directory ``regress''.  Runs the compiled regression tests
                    441:                    on the local host.
1.1       tv        442:
                    443:    The "build.sh" script
                    444:      This script file is a Bourne shell script designed to build the entire
                    445:      NetBSD system on any host with a Bourne shell in /bin/sh, including many
                    446:      that are not POSIX compliant.  Note that if a host system's /bin/sh is
                    447:      unusually old and broken, the Korn Shell (/bin/ksh), if available, may be
                    448:      a usable alternative.
                    449:
                    450:      All cross-compile builds, and most native builds, of the entire system
                    451:      should make use of build.sh rather than just running ``make''.  This way,
                    452:      the make(1) program will be bootstrapped properly, in case the host sys-
                    453:      tem has an older or incompatible ``make'' program.
                    454:
                    455:      When compiling the entire system via build.sh, many make(1) variables are
                    456:      set for you in order to help encapsulate the build process.  In the list
                    457:      of options below, variables that are automatically set by build.sh are
                    458:      noted where applicable.
                    459:
1.22      lukem     460:      The following operations are supported by build.sh:
                    461:
                    462:      build         Build the system as per ``make build''.  This option im-
                    463:                    plies the obj and tools operations.
                    464:
                    465:      distribution  Build a full distribution as per ``make distribution''.
                    466:                    This option implies the build operation.
                    467:
                    468:      release       Build a full release as per ``make release''.  This option
                    469:                    implies the distribution operation.
                    470:
1.23      lukem     471:      makewrapper   Create the nbmake-MACHINE wrapper.  This operation is auto-
                    472:                    matically performed for any of the other operations.
                    473:
1.22      lukem     474:      obj           Perform ``make obj''.
                    475:
                    476:      tools         Build and install the host tools from src/tools.
                    477:
                    478:      kernel=kconf  Build a new kernel.  The kconf argument is the name of a
                    479:                    configuration file suitable for use by config(8).  If kconf
                    480:                    does not contain any `/' characters, the configuration file
                    481:                    is expected to be found in the KERNCONFDIR directory, which
                    482:                    is typically sys/arch/MACHINE/conf.  The new kernel will be
                    483:                    built in a subdirectory of KERNOBJDIR, which is typically
                    484:                    sys/arch/MACHINE/compile or an associated object directory.
                    485:                    In order to ensure that the kernel is built using up-to-
                    486:                    date tools, it is strongly recommended that the tools be
                    487:                    rebuilt (using the tools operation).
                    488:
                    489:      install=idir  Install the contents of DESTDIR to idir, using ``make
                    490:                    installworld''.
1.24      lukem     491:
                    492:      sets          Perform ``make sets''.
1.22      lukem     493:
                    494:      The following command line options alter the behaviour of the above oper-
                    495:      ations: The following command line options alter the behaviour of the
                    496:      build.sh operations described above:
1.1       tv        497:
                    498:      -a arch   Set the value of MACHINE_ARCH to arch.
1.9       thorpej   499:
                    500:      -B buildid
                    501:                Set the value of BUILDID to buildid.  This will also append the
                    502:                build idenfitier to the name of the ``make'' wrapper script so
                    503:                that the resulting name is of the form ``nbmake-MACHINE-
                    504:                BUILDID''.
1.1       tv        505:
1.18      lukem     506:      -D dest   Set the value of DESTDIR to dest.
                    507:
1.23      lukem     508:      -E        Set `expert' mode.  This overrides various sanity checks, and
                    509:                allows: DESTDIR does not have to be set to a non-root path for
                    510:                builds, and UNPRIVED does not have to be set when building as a
                    511:                non-root user.
                    512:
                    513:                Note: It is highly recommended that you know what you are doing
                    514:                when you use this option.
1.19      lukem     515:
1.10      sommerfe  516:      -j njob   Passed through to make(1).  Makefiles should use .WAIT or have
                    517:                explicit dependancies as necessary to enforce build ordering.
                    518:                If you see build failures with -j, please save complete build
                    519:                logs so the failures can be analyzed.
1.1       tv        520:
1.18      lukem     521:      -M obj    Set MAKEOBJDIRPREFIX to obj.
                    522:
1.1       tv        523:      -m mach   Set the value of MACHINE to mach.  This will also override any
                    524:                value of MACHINE_ARCH in the process environment with a value
                    525:                deduced from mach, unless -a is specified.  All cross builds
                    526:                require -m, but if unset on a NetBSD host, the host's value of
                    527:                MACHINE will be detected and used automatically.
                    528:
                    529:      -n        Show the commands that would be executed by build.sh, but do
                    530:                not make any changes.  This is similar in concept to ``make
                    531:                -n''.
                    532:
1.18      lukem     533:      -O obj    Create an appropriate transform macro for MAKEOBJDIR that will
                    534:                place the built object files under obj.  For instance, a set-
                    535:                ting of /usr/obj will place build-time files under
                    536:                /usr/obj/bin, /usr/obj/lib, and so forth.
                    537:
1.1       tv        538:      -o        Set the value of MKOBJDIRS to ``no''.
                    539:
1.22      lukem     540:      -R rel    Set the value of RELEASEDIR to rel.
1.18      lukem     541:
1.1       tv        542:      -r        Remove the contents of DESTDIR and TOOLDIR before building
                    543:                (provides a clean starting point).  This will skip deleting
                    544:                DESTDIR if building on a native system to the root directory.
                    545:
1.18      lukem     546:      -T tools  Set the value of TOOLDIR to tools.  If set, the bootstrap
                    547:                ``make'' will only be rebuilt as needed (when the source files
                    548:                for make(1) change).
                    549:
                    550:      -U        Set the UNPRIVED variable.
                    551:
1.1       tv        552:      -u        Set the UPDATE variable.
                    553:
1.21      lukem     554:      -V var=[value]
1.23      lukem     555:                Set the variable var to value (which is optional).
1.21      lukem     556:
1.1       tv        557:      -w wrapper
                    558:                Create the nbmake wrapper script (see below) in a custom loca-
                    559:                tion, specified by wrapper.  This allows, for instance, to
                    560:                place the wrapper in PATH automatically.  Note that wrapper is
                    561:                the full name of the file, not just a directory name.
                    562:
                    563:    The "nbmake-MACHINE" wrapper script
                    564:      If using the build.sh script to build NetBSD, a nbmake-MACHINE script
                    565:      will be created in TOOLDIR/bin upon the first build to assist in building
                    566:      subtrees on a cross-compile host.
                    567:
                    568:      nbmake-MACHINE can be invoked in lieu of make(1), and will instead call
                    569:      the up-to-date version of ``nbmake'' installed into TOOLDIR/bin with sev-
                    570:      eral key variables pre-set, including MACHINE, MACHINE_ARCH, and TOOLDIR.
                    571:      This script can be symlinked into a directory listed in PATH, or called
                    572:      with an absolute path.
                    573:
1.16      lukem     574: EXAMPLES
1.22      lukem     575:      ./build.sh tools kernel=GENERIC
1.16      lukem     576:                Build a new toolchain, and use the new toolchain to configure
1.25    ! lukem     577:                and build a new GENERIC kernel.
1.16      lukem     578:
1.25    ! lukem     579:      ./build.sh -U -D /path/to/DESTDIR distribution
1.16      lukem     580:                Using unprivileged mode, build a complete distribution in
1.25    ! lukem     581:                /path/to/DESTDIR.
1.16      lukem     582:
1.25    ! lukem     583:      # ./build.sh -U -D /path/to/DESTDIR installworld=/
1.22      lukem     584:                As root, install the distribution that was built with unprivi-
1.25    ! lukem     585:                leged mode from /path/to/DESTDIR to /.  (Even though this is
        !           586:                run as root, -U is required so that the permissions stored in
        !           587:                /path/to/DESTDIR/METALOG are correctly applied to the files as
1.23      lukem     588:                they're copied to /).
                    589:
1.25    ! lukem     590:      ./build.sh -U -D /path/to/DESTDIR -R /path/to/RELEASE release
1.23      lukem     591:                Using unprivileged mode, build a complete release in
1.25    ! lukem     592:                /path/to/dir/RELEASE.
1.16      lukem     593:
1.10      sommerfe  594: OBSOLETE VARIABLES
1.15      lukem     595:      NBUILDJOBS  Use the make(1) option -j, instead.
                    596:
                    597:      USE_NEW_TOOLCHAIN
                    598:                  The new toolchain is now the default.  To disable, use
                    599:                  TOOLCHAIN_MISSING=yes.
1.10      sommerfe  600:
1.1       tv        601: SEE ALSO
                    602:      make(1), hier(7), release(7)
                    603:
                    604: HISTORY
1.15      lukem     605:      The build.sh based build scheme was introduced for NetBSD 1.6 as
                    606:      USE_NEW_TOOLCHAIN, and re-worked to TOOLCHAIN_MISSING after that.
1.1       tv        607:
                    608: BUGS
1.15      lukem     609:      A few platforms are not yet using this build system.
1.1       tv        610:
1.23      lukem     611: NetBSD                         January 26, 2003                             10

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