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Annotation of src/BUILDING, Revision 1.2

1.1       tv          1: BUILDING(8)             NetBSD System Manager's Manual             BUILDING(8)
                      3: NAME
                      4:      BUILDING - Procedure for building NetBSD from source code.
                      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.
                     12:      Discrepancies between this documentation and the current reality of im-
                     13:      plementation are noted specially, as with the note below:
                     15:      Note: This document applies only to platforms which use the new toolchain
                     16:      as indicated by the setting of USE_NEW_TOOLCHAIN in /etc/mk.conf or
                     17:      <bsd.own.mk>.  Platforms which have not yet been switched to the new
                     18:      toolchain should continue building traditionally, using the notes speci-
                     19:      fied in the file UPDATING.
                     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).
                     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.
                     33:            Note: A couple host toolchain components are not yet available in
                     34:            the tools directory.  Also, some tools use non-POSIX, non-ANSI C
                     35:            extensions and need to be standardized.  As a result, cross-compil-
                     36:            ing from systems other than NetBSD is not currently supported.
                     38: FILES
                     39:    Source tree layout
                     41:      BUILDING.mdoc  This document (in -mdoc troff format; the original copy).
1.2     ! wiz        43:      BUILDING       This document (in plaintext).
1.1       tv         44:
                     45:      Makefile       The main Makefile for NetBSD; should only be run for na-
                     46:                     tive builds with an appropriately up-to-date version of
                     47:                     NetBSD make(1).  (For building from out-of-date systems or
                     48:                     on a non-native host, see the build.sh shell script.)
                     50:      UPDATING       Special notes for updating from an earlier revision of
                     51:                     NetBSD.  It is important to read this file before every
                     52:                     build of an updated source tree.
                     54:      build.sh       Bourne-compatible shell script used for building the host
                     55:                     build tools and the NetBSD system from scratch.  Can be
                     56:                     used for both native and cross builds, and should be used
                     57:                     instead of make(1) for any source tree that is updated and
                     58:                     recompiled regularly.
                     60:      crypto/dist/, dist/, gnu/dist/
                     61:                     Sources imported verbatim from third parties, without man-
                     62:                     gling the existing build structure.  Other source trees in
                     63:                     bin through usr.sbin use the NetBSD make(1) ``reachover''
                     64:                     Makefile semantics when building these programs for a na-
                     65:                     tive host.
                     67:      distrib/, etc/
                     68:                     Sources for items used when making a full release snap-
                     69:                     shot, such as files installed in /etc on the destination
                     70:                     system, boot media, and release notes.
                     72:      regress/       Regression test harness.  Can be cross-compiled, but only
                     73:                     run natively.
                     75:      sys/           NetBSD kernel sources.
                     77:      tools/         ``Reachover'' build structure for the host build tools.
                     78:                     This has a special method of determining out-of-date sta-
                     79:                     tus.
                     81:      bin/ ... usr.sbin/
                     82:                     Sources to the NetBSD userland (non-kernel) programs.  If
                     83:                     any of these directories are missing, they will be skipped
                     84:                     during the build.
                     86:    Build tree layout
                     87:      The NetBSD build tree is described in hier(7), and the release layout is
                     88:      described in release(7).
                     90: CONFIGURATION
                     91:    "make" variables
                     92:      Several variables control the behavior of NetBSD builds.  Unless other-
                     93:      wise specified, these variables may be set in either the process environ-
                     94:      ment or the make(1) configuration file specified by MAKECONF.
                     96:      DESTDIR     Directory to contain the built NetBSD system.  If set, spe-
                     97:                  cial options are passed to the compilation tools to prevent
                     98:                  their default use of the host system's /usr/include,
                     99:                  /usr/lib, and so forth.  This pathname should not end with a
                    100:                  slash (/) character (for installation into the system's root
                    101:                  directory, set DESTDIR to an empty string).
                    103:                  Default: Empty string if USETOOLS is ``yes''; unset other-
                    104:                  wise.
                    106:      MAKECONF    The name of the make(1) configuration file.  Only settable in
                    107:                  the process environment.
                    109:                  Default: ``/etc/mk.conf''
                    111:      MKCATPAGES  Can be set to ``yes'' or ``no''.  Indicates whether prefor-
                    112:                  matted plaintext manual pages will be created during a build.
                    114:                  Default: ``yes''
                    116:      MKCRYPTO    Can be set to ``yes'' or ``no''.  Indicates whether crypto-
                    117:                  graphic code will be included in a build; provided for the
                    118:                  benefit of countries that do not allow strong cryptography.
                    119:                  Will not affect use of the standard low-security password en-
                    120:                  cryption system, crypt(3).
                    122:                  Default: ``yes''
                    124:      MKDOC       Can be set to ``yes'' or ``no''.  Indicates whether system
                    125:                  documentation destined for /usr/share/doc will be installed
                    126:                  during a build.
                    128:                  Default: ``yes''
                    130:      MKINFO      Can be set to ``yes'' or ``no''.  Indicates whether GNU Info
                    131:                  files, used for the documentation for most of the compilation
                    132:                  tools, will be created and installed during a build.
                    134:                  Default: ``yes''
                    136:      MKLINT      Can be set to ``yes'' or ``no''.  Indicates whether lint(1)
                    137:                  will be run against portions of the NetBSD source code during
                    138:                  the build, and whether lint libraries will be installed into
                    139:                  /usr/libdata/lint.
                    141:                  Default: ``yes''
                    143:      MKMAN       Can be set to ``yes'' or ``no''.  Indicates whether manual
                    144:                  pages will be installed during a build.
                    146:                  Default: ``yes''
                    148:      MKNLS       Can be set to ``yes'' or ``no''.  Indicates whether Native
                    149:                  Language System locale zone files will be compiled and in-
                    150:                  stalled during a build.
                    152:                  Default: ``yes''
                    154:      MKOBJ       Can be set to ``yes'' or ``no''.  Indicates whether object
                    155:                  directories will be created when running ``make obj''.  If
                    156:                  set to ``no'', then all built files will be located inside
                    157:                  the regular source tree.
                    159:                  Default: ``yes''
                    161:      MKPIC       Can be set to ``yes'' or ``no''.  Indicates whether shared
                    162:                  objects and libraries will be created and installed during a
                    163:                  build.  If set to ``no'', the entire built system will be
                    164:                  statically linked.
                    166:                  Default: Platform dependent.  As of this writing, all plat-
                    167:                  forms except sh3 default to ``yes''.
                    169:      MKPICINSTALL
                    170:                  Can be set to ``yes'' or ``no''.  Indicates whether the ar(1)
                    171:                  format libraries (lib*_pic.a), used to generate shared li-
                    172:                  braries, are installed during a build.
                    174:                  Default: ``yes''
                    176:      MKPROFILE   Can be set to ``yes'' or ``no''.  Indicates whether profiled
                    177:                  libraries (lib*_p.a) will be built and installed during a
                    178:                  build.
                    180:                  Default: ``yes''; however, some platforms turn off MKPROFILE
                    181:                  by default at times due to toolchain problems with profiled
                    182:                  code.
                    184:      MKSHARE     Can be set to ``yes'' or ``no''.  Indicates whether files
                    185:                  destined to reside in /usr/share will be built and installed
                    186:                  during a build.  If set to ``no'', then all of MKCATPAGES,
                    187:                  MKDOC, MKINFO, MKMAN, and MKNLS will be set to ``no'' uncon-
                    188:                  ditionally.
                    190:                  Default: ``yes''
                    192:      TOOLDIR     Directory to hold the host tools, once built.  This directory
                    193:                  should be unique to a given host system and NetBSD source
                    194:                  tree.  (However, multiple targets may share the same TOOLDIR;
                    195:                  the target-dependent files have unique names.)  If unset, a
                    196:                  default based on the uname(1) information of the host plat-
                    197:                  form will be created in the .OBJDIR of src/tools.
                    199:                  Default: Unset.
                    201:      UPDATE      If set, then all install operations intended to write to
                    202:                  DESTDIR will compare file timestamps before installing, and
                    203:                  skip the install phase if the destination files are up-to-
                    204:                  date.  This also has implications on full builds (see next
                    205:                  subsection).
                    207:                  Default: Unset.
                    209:      USETOOLS    Indicates whether the tools specified by TOOLDIR should be
                    210:                  used as part of a build in progress.  Must be set to ``yes''
                    211:                  if cross-compiling.
                    213:                  yes    Use the tools from TOOLDIR.
                    215:                  no     Do not use the tools from TOOLDIR, but refuse to build
                    216:                         native compilation tool components that are version-
                    217:                         specific for that tool.
                    219:                  never  Do not use the tools from TOOLDIR, even when building
                    220:                         native tool components.  This is similar to the tradi-
                    221:                         tional NetBSD build method, but does not verify that
                    222:                         the compilation tools in use are up-to-date enough in
                    223:                         order to build the tree successfully.  This may cause
                    224:                         build or runtime problems when building the whole
                    225:                         NetBSD source tree.
                    227:                  Default: ``yes'' if building all or part of a whole NetBSD
                    228:                  source tree (detected automatically); ``no'' otherwise (to
                    229:                  preserve traditional semantics of the <bsd.*.mk> make(1) in-
                    230:                  clude files).
                    232:    "make" variables for full builds
                    233:      These variables only affect the top level ``Makefile'' and do not manual-
                    234:      ly building subtrees of the NetBSD source code.
                    236:      MKOBJDIRS      Can be set to ``yes'' or ``no''.  Indicates whether object
                    237:                     directories will be created automatically (via a ``make
                    238:                     obj'' pass) at the start of a build.
                    240:                     Default: ``yes''
                    242:      MKTOOLS        Indicates whether the host tools will be built and in-
                    243:                     stalled automatically if they are out-of-date.
                    245:                     yes    Build tools as needed into TOOLDIR, but only if the
                    246:                            tools in question are out-of-date.
                    248:                     no     Do not update the tools in TOOLDIR; halt the build
                    249:                            as a safety precaution if tools are out-of-date.
                    251:                     always
                    252:                            Always rebuild the tools in TOOLDIR from scratch
                    253:                            during a build.  This is similar to the standard
                    254:                            NetBSD source tree build method, but is not typi-
                    255:                            cally required for host tools.
                    257:                     Default: ``yes''
                    259:      NBUILDJOBS     If set, specifies the number of parallel make(1) processes
                    260:                     that should be run simultaneously.  This can speed up
                    261:                     builds on SMP machines, or machines with much more CPU
                    262:                     power than I/O availability.  This should be used instead
                    263:                     of the make(1) option -j, in order to ensure proper order-
                    264:                     ing of build components.
                    266:                     Default: Unset.
                    268:      NOCLEANDIR     If set, avoids the ``make cleandir'' phase of a full
                    269:                     build.  This has the effect of allowing only changed files
                    270:                     in a source tree to be recompiled.  This can speed up
                    271:                     builds when updating only a few files in the tree.
                    273:                     Default: Unset.
                    275:      NODISTRIBDIRS  If set, avoids the ``make distrib-dirs'' phase of a full
                    276:                     build.  This skips running mtree(8) on DESTDIR, useful on
                    277:                     systems where building as an unprivileged user, or where
                    278:                     it is known that the system-wide mtree files have not
                    279:                     changed.
                    281:                     Default: Unset.
                    283:      NOINCLUDES     If set, avoids the ``make includes'' phase of a full
                    284:                     build.  This has the effect of preventing make(1) from
                    285:                     thinking that some programs are out-of-date simply because
                    286:                     the system include files have changed.  However, this op-
                    287:                     tion should not be used when updating the entire NetBSD
                    288:                     source tree arbitrarily; it is suggested to use UPDATE in
                    289:                     that case.
                    291:                     Default: Unset.
                    293:      RELEASEDIR     If set, specifies the directory to which a release(7) lay-
                    294:                     out will be written at the end of a ``make release''.
                    296:                     Default: Unset.
                    298:      UPDATE         If set, then in addition to the effects described for UP-
                    299:                     DATE above, this implies the effects of NOCLEANDIR.
                    301: BUILDING
                    302:    "make" command line options
                    303:      This is only a summary of options available to make(1); only the options
                    304:      used most frequently with NetBSD builds are listed here.
                    306:      -m dir     Specify the default directory for searching for system Make-
                    307:                 file segments, mainly the <bsd.*.mk> files.  When building any
                    308:                 full NetBSD source tree, this should be set to the
                    309:                 ``share/mk'' directory in the source tree.  (This is set auto-
                    310:                 matically when building from the top level.)
                    312:      -n         Display the commands that would have been executed, but do not
                    313:                 actually execute them.  This will still cause recursion to
                    314:                 take place.
                    316:      -v var     Print make(1)'s idea of the value of var.  Does not build any
                    317:                 targets.
                    319:      var=value  Set the variable var to value, overriding any setting speci-
                    320:                 fied by the process environment, the MAKECONF configuration
                    321:                 file, or the system Makefile segments.
                    323:    "make" targets
                    324:      These default targets may be built by running make(1) in any subtree of
                    325:      the NetBSD source code.  It is recommended that none of these be used
                    326:      from the top level Makefile; as a specific exception, ``make obj'' and
                    327:      ``make cleandir'' are useful in that context.
                    329:      all        Build programs, libraries, and preformatted documentation.
                    331:      clean      Remove program and library object code files.
                    333:      cleandir   Same as clean, but also remove preformatted documentation, de-
                    334:                 pendency files generated by ``make depend'', and any other
                    335:                 files known to be created at build time.  ``make distclean''
                    336:                 may be used as a synonym, for familiarity with a similar well-
                    337:                 known convention.
                    339:      depend     Create dependency files (.depend) containing more detailed in-
                    340:                 formation about the dependencies of source code on header
                    341:                 files.  Allows programs to be recompiled automatically when a
                    342:                 dependency changes.
                    344:      dependall  Does a ``make depend'' immediately followed by a ``make all''.
                    345:                 This combined target recurses as an atomic unit, so that the
                    346:                 ``make depend'' phase can participate in make -j parallelism.
                    348:      includes   Build and install system header files.  Typically needed be-
                    349:                 fore any system libraries or programs can be built.
                    351:      install    Install programs, libraries, and documentation into DESTDIR.
                    353:      lint       Run lint(1) against the C source code, where appropriate, and
                    354:                 generate system-installed lint libraries.
                    356:      obj        Create object directories to be used for built files, instead
                    357:                 of building directly in the source tree.
                    359:      tags       Create ctags(1) searchable function lists usable by the ex(1)
                    360:                 and vi(1) text editors.
                    362:    "make" targets for the top level
                    363:      Additional make(1) targets are usable specifically from the top source
                    364:      level to facilitate building the entire NetBSD source tree.
                    366:      build      Build the entire NetBSD system.  This orders portions of the
                    367:                 source tree such that prerequisites will be built in the prop-
                    368:                 er order.
                    370:      release    Do a ``make build'', then package the system into a standard
                    371:                 release layout as described by release(7).  This requires that
                    372:                 RELEASEDIR be set (see above).
                    374:      regression-tests
                    375:                 Can only be run after building the regression tests in the di-
                    376:                 rectory ``regress''.  Runs the compiled regression tests on
                    377:                 the local host.
                    379:    The "build.sh" script
                    380:      This script file is a Bourne shell script designed to build the entire
                    381:      NetBSD system on any host with a Bourne shell in /bin/sh, including many
                    382:      that are not POSIX compliant.  Note that if a host system's /bin/sh is
                    383:      unusually old and broken, the Korn Shell (/bin/ksh), if available, may be
                    384:      a usable alternative.
                    386:      All cross-compile builds, and most native builds, of the entire system
                    387:      should make use of build.sh rather than just running ``make''.  This way,
                    388:      the make(1) program will be bootstrapped properly, in case the host sys-
                    389:      tem has an older or incompatible ``make'' program.
                    391:      When compiling the entire system via build.sh, many make(1) variables are
                    392:      set for you in order to help encapsulate the build process.  In the list
                    393:      of options below, variables that are automatically set by build.sh are
                    394:      noted where applicable.
                    396:      The following are available command line options that may be supplied to
                    397:      build.sh:
                    399:      -a arch   Set the value of MACHINE_ARCH to arch.
                    401:      -b        Bootstrap ``make'' and create a nbmake-MACHINE script (see be-
                    402:                low).
                    404:      -j njob   Set the value of NBUILDJOBS to njob.  This provides similar
                    405:                functionality to the familiar ``make -j'', but preserves the
                    406:                ordering of the top level ``make build''.
                    408:      -m mach   Set the value of MACHINE to mach.  This will also override any
                    409:                value of MACHINE_ARCH in the process environment with a value
                    410:                deduced from mach, unless -a is specified.  All cross builds
                    411:                require -m, but if unset on a NetBSD host, the host's value of
                    412:                MACHINE will be detected and used automatically.
                    414:      -n        Show the commands that would be executed by build.sh, but do
                    415:                not make any changes.  This is similar in concept to ``make
                    416:                -n''.
                    418:      -o        Set the value of MKOBJDIRS to ``no''.
                    420:      -r        Remove the contents of DESTDIR and TOOLDIR before building
                    421:                (provides a clean starting point).  This will skip deleting
                    422:                DESTDIR if building on a native system to the root directory.
                    424:      -t        Build and install the host tools from src/tools only.  This op-
                    425:                tion implies -b.
                    427:      -u        Set the UPDATE variable.
                    429:      -w wrapper
                    430:                Create the nbmake wrapper script (see below) in a custom loca-
                    431:                tion, specified by wrapper.  This allows, for instance, to
                    432:                place the wrapper in PATH automatically.  Note that wrapper is
                    433:                the full name of the file, not just a directory name.
                    435:      -D dest   Set the value of DESTDIR to dest.
                    437:      -O obj    Create an appropriate transform macro for MAKEOBJDIR that will
                    438:                place the built object files under obj.  For instance, a set-
                    439:                ting of /usr/obj will place build-time files files under
                    440:                /usr/obj/bin, /usr/obj/lib, and so forth.
                    442:      -R rel    Set the value of RELEASEDIR to rel.  Setting this option will
                    443:                cause build.sh to run ``make release'' instead of ``make
                    444:                build''.
                    446:      -T tools  Set the value of TOOLDIR to tools.  If set, the bootstrap
                    447:                ``make'' will only be rebuilt as needed (when the source files
                    448:                for make(1) change).
                    450:    The "nbmake-MACHINE" wrapper script
                    451:      If using the build.sh script to build NetBSD, a nbmake-MACHINE script
                    452:      will be created in TOOLDIR/bin upon the first build to assist in building
                    453:      subtrees on a cross-compile host.
                    455:      nbmake-MACHINE can be invoked in lieu of make(1), and will instead call
                    456:      the up-to-date version of ``nbmake'' installed into TOOLDIR/bin with sev-
                    457:      eral key variables pre-set, including MACHINE, MACHINE_ARCH, and TOOLDIR.
                    458:      This script can be symlinked into a directory listed in PATH, or called
                    459:      with an absolute path.
                    461: SEE ALSO
                    462:      make(1), hier(7), release(7)
                    464: HISTORY
                    465:      The USE_NEW_TOOLCHAIN based build scheme was introduced in the ``NetBSD-
                    466:      current'' development sources between NetBSD 1.5 and NetBSD 1.6.
                    468: BUGS
                    469:      Many platforms are not yet using the USE_NEW_TOOLCHAIN system.
                    471: NetBSD                         October 29, 2001                              8

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