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    1: **Contents**
    3: [[!toc levels=3]]
    5: # Crosscompiling NetBSD with
    7: When targeting a product for an embedded platform, it's not feasible to have all
    8: the development tools available on that same platform. Instead, some method of
    9: crosscompiling is usually used today. NetBSD 1.6 and forward comes with a
   10: framework to build both the operating system's kernel and the whole userland for
   11: either the same platform that the compiler runs on, or for a different platform,
   12: using crosscompiling. Crosscompiling requires assembler, linker, compiler etc.
   13: to be available and built for the target platform. The new build scheme will
   14: take care of creating these tools for a given platform, and make them available
   15: ready to use to do development work.
   17: In this chapter, we will show how to use `` to first create a
   18: crosscompiling toolchain, including cross-compiler, cross-assembler,
   19: cross-linker and so on. While native kernel builds are covered in [[Compiling
   20: the kernel|guide/kernel]], these tools are then used to manually configure and
   21: crosscompile a kernel for a different platform, and then show how to use
   22: `` as a convenient alternative. After that works, the whole NetBSD
   23: userland will be compiled and packed up in the format of a NetBSD release. In
   24: the examples, we will use the Sun UltraSPARC (*sparc64*) 64-bit platform as
   25: target platform, any other platform supported by NetBSD can be targetted as well
   26: specifying its name (see `/usr/src/sys/arch`).
   28: Before starting, take note that it is assumed that the NetBSD sources from the
   29: `netbsd-4-0` branch are available in `/usr/src` as described in
   30: [[Obtaining the sources|guide/fetch]].
   32: A more detailed description of the `` framework can be found in Luke
   33: Mewburn and Matthew Green's
   34: [paper]( and their
   35: [presentation]( from
   36: BSDCon 2003 as well as in `/usr/src/BUILDING`.
   38: ## Building the crosscompiler
   40: The first step to do cross-development is to get all the necessary tools
   41: available. In NetBSD terminology, this is called the "toolchain", and it
   42: includes BSD-compatible
   43: [make(1)](,
   44: C/C++ compilers, linker, assembler,
   45: [config(8)](,
   46: as well as a fair number of tools that are only required when crosscompiling a
   47: full NetBSD release, which we won't cover here.
   49: The command to create the crosscompiler is quite simple, using NetBSD's new
   50: `src/` script. Please note that all the commands here can be run as
   51: normal (non-root) user:
   53:     $ cd /usr/src
   54:     $ ./ -m sparc64 tools
   56: Make sure that the directory `/usr/obj` does exist, or add a `-O` option to the
   57: call, redirecting the object directory someplace else.
   59: If the tools have been built previously and they only need updated, then the
   60: update option `-u` can be used to only rebuild tools that have changed:
   62:     $ ./ -u -m sparc64 tools
   64: When the tools are built, information about them and several environment
   65: variables is printed out:
   67:     ...
   68:     ===> started: Thu Dec  2 22:18:11 CET 2007
   69:     ===> ended:   Thu Dec  2 22:28:22 CET 2007
   70:     ===> Summary of results:
   71:     command: ./ -m sparc64 tools
   72:     started: Thu Dec  2 22:18:11 CET 2007
   73:              No nonexistent/bin/nbmake, needs building.
   74:              Bootstrapping nbmake
   75:              MACHINE:          sparc64
   76:              MACHINE_ARCH:     sparc64
   77:              TOOLDIR path:     /usr/src/tooldir.NetBSD-4.0-i386
   78:              DESTDIR path:     /usr/src/destdir.sparc64
   79:              RELEASEDIR path:  /usr/src/releasedir
   80:              Created /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake
   81:              makewrapper:      /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake-sparc64
   82:              Updated /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake-sparc64
   83:              Tools built to /usr/src/tooldir.NetBSD-4.0-i386
   84:     started: Thu Dec  2 22:18:11 CET 2007
   85:     ended:   Thu Dec  2 22:28:22 CET 2007
   86:     ===> .
   88: During the build, object directories are used consistently, i.e. special
   89: directories are kept that keep the platform-specific object files and compile
   90: results. In our example, they will be kept in directories named `obj.sparc64` as
   91: we build for UltraSPARC as target platform.
   93: The toolchain itself is part of this, but as it's hosted and compiled for a i386
   94: system, it will get placed in its own directory indicating where to cross-build
   95: from. Here's where our crosscompiler tools are located:
   97:     $ pwd
   98:     /usr/src
   99:     $ ls -d tooldir.*
  100:     tooldir.NetBSD-4.0-i386
  102: So the general rule of thumb is for a given `host` and `target` system
  103: combination, the crosscompiler will be placed in the `src/`
  104: directory by default. A full list of all tools created for crosscompiling the
  105: whole NetBSD operating system includes:
  107:     $ ls tooldir.NetBSD-4.0-i386/bin/
  108:     nbasn1_compile          nbmakefs                nbzic
  109:     nbcap_mkdb              nbmakeinfo              sparc64--netbsd-addr2li
  110:     nbcat                   nbmakewhatis            sparc64--netbsd-ar
  111:     nbcksum                 nbmenuc                 sparc64--netbsd-as
  112:     nbcompile_et            nbmkcsmapper            sparc64--netbsd-c++
  113:     nbconfig                nbmkdep                 sparc64--netbsd-c++filt
  114:     nbcrunchgen             nbmkesdb                sparc64--netbsd-cpp
  115:     nbctags                 nbmklocale              sparc64--netbsd-dbsym
  116:     nbdb                    nbmknod                 sparc64--netbsd-g++
  117:     nbeqn                   nbmktemp                sparc64--netbsd-g77
  118:     nbfgen                  nbmsgc                  sparc64--netbsd-gcc
  119:     nbfile                  nbmtree                 sparc64--netbsd-gcc-3.3
  120:     nbgencat                nbnroff                 sparc64--netbsd-gccbug
  121:     nbgroff                 nbpax                   sparc64--netbsd-gcov
  122:     nbhexdump               nbpic                   sparc64--netbsd-ld
  123:     nbhost-mkdep            nbpwd_mkdb              sparc64--netbsd-lint
  124:     nbindxbib               nbrefer                 sparc64--netbsd-mdsetim
  125:     nbinfo                  nbrpcgen                sparc64--netbsd-nm
  126:     nbinfokey               nbsoelim                sparc64--netbsd-objcopy
  127:     nbinstall               nbstat                  sparc64--netbsd-objdump
  128:     nbinstall-info          nbsunlabel              sparc64--netbsd-ranlib
  129:     nbinstallboot           nbtbl                   sparc64--netbsd-readelf
  130:     nblex                   nbtexi2dvi              sparc64--netbsd-size
  131:     nblorder                nbtexindex              sparc64--netbsd-strings
  132:     nbm4                    nbtsort                 sparc64--netbsd-strip
  133:     nbmake                  nbuudecode
  134:     nbmake-sparc64          nbyacc
  136: As you can see, most of the tools that are available native on NetBSD are
  137: present with some program prefix to identify the target platform for tools that
  138: are specific to a certain target platform.
  140: One important tool that should be pointed out here is `nbmake-sparc64`. This is
  141: a shell wrapper for a BSD compatible
  142: [make(1)]( command
  143: that's setup to use all the right commands from the crosscompiler toolchain.
  144: Using this wrapper instead of `/usr/bin/make` allows crosscompiling programs
  145: that were written using the NetBSD Makefile infrastructure (see `src/share/mk`).
  146: We will use this
  147: [make(1)]( wrapper
  148: in a second to cross compile the kernel!
  150: ## Configuring the kernel manually
  152: Now that we have a working crosscompiler available, the "usual" steps for
  153: building a kernel are needed - create a kernel config file, run
  154: [config(1)](,
  155: then build. As the
  156: [config(1)](
  157: program used to create header files and Makefile for a kernel build is platform
  158: specific, we need to use the `nbconfig` program that's part of our new
  159: toolchain. That aside, the procedure is just as like compiling a "native" NetBSD
  160: kernel. Commands involved here are:
  162:     $ cd /usr/src/sys/arch/sparc64/conf
  163:     $ cp GENERIC MYKERNEL
  164:     $ vi MYKERNEL
  165:     $ /usr/src/tooldir.NetBSD-4.0-i386/bin/nbconfig MYKERNEL
  167: That's all. This command has created a directory `../compile/MYKERNEL` with a
  168: number of header files defining information about devices to compile into the
  169: kernel, a Makefile that is setup to build all the needed files for the kernel,
  170: and link them together.
  172: ## Crosscompiling the kernel manually
  174: We have all the files and tools available to crosscompile our UltraSPARC-based
  175: kernel from our Intel-based host system, so let's get to it! After changing in
  176: the directory created in the previous step, we need to use the crosscompiler
  177: toolchain's `nbmake-sparc64` shell wrapper, which just calls make(1) with all
  178: the necessary settings for crosscompiling for a sparc64 platform:
  180:     $ cd ../compile/MYKERNEL/
  181:     $ /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake-sparc64 depend
  182:     $ /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake-sparc64
  184: This will churn away a bit, then spit out a kernel:
  186:     ...
  187:        text    data     bss     dec     hex filename
  188:     5016899  163728  628752 5809379  58a4e3 netbsd
  189:     $ ls -l netbsd
  190:     -rwxr-xr-x  1 feyrer  666  5874663 Dec  2 23:17 netbsd
  191:     $ file netbsd
  192:     netbsd: ELF 64-bit MSB executable, SPARC V9, version 1 (SYSV), statically linked, not stripped
  194: Now the kernel in the file `netbsd` can either be transferred to a UltraSPARC
  195: machine (via NFS, FTP, scp, etc.) and booted from a possible harddisk, or
  196: directly from our cross-development machine using NFS.
  198: After configuring and crosscompiling the kernel, the next logical step is to
  199: crosscompile the whole system, and bring it into a distribution-ready format.
  200: Before doing so, an alternative approach to crosscompiling a kernel will be
  201: shown in the next section, using the `` script to do configuration and
  202: crosscompilation of the kernel in one step.
  204: ## Crosscompiling the kernel with
  206: A cross compiled kernel can be done manually as described in the previous
  207: sections, or by the easier method of using ``, which will be shown here.
  209: Preparation of the kernel config file is the same as described above:
  211:     $ cd /usr/src/sys/arch/sparc64/conf
  212:     $ cp GENERIC MYKERNEL
  213:     $ vi MYKERNEL
  215: Then edit `MYKERNEL` and once finished, all that needs to be done is to use
  216: `` to build the kernel (it will also configure it, running the steps
  217: shown above):
  219:     $ cd /usr/src
  220:     $ ./ -u -m sparc64 kernel=MYKERNEL
  222: Notice that update (`-u`) was specified, the tools are already built, there is
  223: no reason to rebuild all of the tools. Once the kernel is built, `` will
  224: print out the location of it along with other information:
  226:     ...
  227:     ===> Summary of results:
  228:     command: ./ -u -m sparc64 kernel=MYKERNEL
  229:     started: Thu Dec  2 23:30:02 CET 2007
  230:              No nonexistent/bin/nbmake, needs building.
  231:              Bootstrapping nbmake
  232:              MACHINE:          sparc64
  233:              MACHINE_ARCH:     sparc64
  234:              TOOLDIR path:     /usr/src/tooldir.NetBSD-4.0-i386
  235:              DESTDIR path:     /usr/src/destdir.sparc64
  236:              RELEASEDIR path:  /usr/src/releasedir
  237:              Created /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake
  238:              makewrapper:      /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake-sparc64
  239:              Updated /usr/src/tooldir.NetBSD-4.0-i386/bin/nbmake-sparc64
  240:              Building kernel without building new tools
  241:              Building kernel:  MYKERNEL
  242:              Build directory:  /usr/src/sys/arch/sparc64/compile/obj.sparc64/GENERIC
  243:              Kernels built from MYKERNEL:
  244:               /usr/src/sys/arch/sparc64/compile/obj.sparc64/MYKERNEL/netbsd
  245:     started: Thu Dec  2 23:30:02 CET 2007
  246:     ended:   Thu Dec  2 23:38:22 CET 2007
  247:     ===> .
  249: The path to the kernel built is of interest here:
  250: `/usr/src/sys/arch/sparc64/compile/obj.sparc64/MYKERNEL/netbsd`, it can be used
  251: the same way as described above.
  253: ## Crosscompiling the userland
  255: By now it is probably becoming clear that the toolchain actually works in
  256: stages. First the crosscompiler is built, then a kernel. Since `` will
  257: attempt to rebuild the tools at every invocation, using `update` saves time. It
  258: is probably also clear that outside of a few options, the `` semantics
  259: are basically ` command`. So, it stands to reason that building the
  260: whole userland and/or a release is a matter of using the right commands.
  262: It should be no surprise that building and creating a release would look like
  263: the following:
  265:     $ ./ -U -u -m sparc64 release
  267: These commands will compile the full NetBSD userland and put it into a
  268: destination directory, and then build a release from it in a release directory.
  269: The `-U` switch is added here for an *unprivileged* build, i.e. one that's
  270: running as normal user and not as root. As no further switches to ``
  271: were given nor any environment variables were set, the defaults of
  272: `DESTDIR=/usr/src/destdir.sparc64` and `RELEASEDIR=/usr/src/releasedir` are
  273: used, as shown in the ``-output above.
  275: ## Crosscompiling the X Window System
  277: The NetBSD project has its own copy of the X Window System's source which is
  278: currently based on XFree86 version 4, and which contains changes to make X going
  279: on as many of the platforms supported by NetBSD as possible. Due to this, it is
  280: desirable to use the X Window System version available from and for NetBSD,
  281: which can also be crosscompiled much like the kernel and base system. To do so,
  282: the xsrc sources must be checked out from CVS into `/usr/xsrc` just as src
  283: and pkgsrc were as described in [[Obtaining the sources|guide/fetch]].
  285: After this, X can be crosscompiled for the target platform by adding the `-x`
  286: switch to, e.g. when creating a full release:
  288:     $ ./ -U -x -u -m sparc64 release
  290: The `-U` flag for doing unprivileged (non-root) builds and the `-u` flag for not
  291: removing old files before building as well as the `-m arch` option to define the
  292: target architecture have already been introduced, and the `-x` option to also
  293: (cross)compile xsrc is another option.
  295: ## Changing build behaviour
  297: Similar to the old, manual building method, the new toolchain has a lot of
  298: variables that can be used to direct things like where certain files go, what
  299: (if any) tools are used and so on. A look in `src/BUILDING` covers most of them.
  300: In this section some examples of changing default settings are given, each
  301: following its own ways.
  303: ### Changing the Destination Directory
  305: Many people like to track NetBSD-current and perform cross compiles of
  306: architectures that they use. The logic for this is simple, sometimes a new
  307: feature or device becomes available and someone may wish to use it. By keeping
  308: track of changes and building every now and again, one can be assured that these
  309: architectures can build their own release.
  311: It is reasonable to assume that if one is tracking and building for more than
  312: one architecture, they might want to keep the builds in a different location
  313: than the default. There are two ways to go about this, either use a script to
  314: set the new DESTDIR, or simply do so interactively. In any case, it can be set
  315: the same way as any other variable (depending on your shell of course).
  317: For bash, the Bourne or Korn shell, this is:
  319:     $ export DESTDIR=/usr/builds/sparc64
  321: For tcsh and the C shell, the command is:
  323:     $ setenv DESTDIR /usr/builds/sparc64
  325: Simple enough. When the build is run, the binaries and files will be sent to
  326: `/usr/builds`.
  328: ### Static Builds
  330: The NetBSD toolchain builds and links against shared libraries by default. Many
  331: users still prefer to be able to link statically. Sometimes a small system can
  332: be created without having shared libraries, which is a good example of doing a
  333: full static build. If a particular build machine will always need one
  334: environment variable set in a particular way, then it is easiest to simply add
  335: the changed setting to `/etc/mk.conf`.
  337: To make sure a build box always builds statically, simply add the following line
  338: to `/etc/mk.conf`:
  340:     LDSTATIC=-static
  342: ### Using options
  344: Besides variables in environment and `/etc/mk.conf`, the build process can be
  345: influenced by a number of switches to the `` script itself, as we have
  346: already seen when forcing unprivileged (non-root) builds, selecting the target
  347: architecture or preventing deletion of old files before the build. All these
  348: options can be listed by running ` -h`:
  350:     $ cd /usr/src
  351:     $ -h
  352:     Usage: [-EnorUux] [-a arch] [-B buildid] [-D dest] [-j njob]
  353:             [-M obj] [-m mach] [-N noisy] [-O obj] [-R release] [-T tools]
  354:             [-V var=[value]] [-w wrapper] [-X x11src] [-Z var]
  355:             operation [...]
  357:      Build operations (all imply "obj" and "tools"):
  358:         build               Run "make build".
  359:         distribution        Run "make distribution" (includes DESTDIR/etc/ files).
  360:         release             Run "make release" (includes kernels and distrib media).
  362:      Other operations:
  363:         help                Show this message and exit.
  364:         makewrapper         Create nbmake-${MACHINE} wrapper and nbmake.
  365:                             Always performed.
  366:         obj                 Run "make obj".  [Default unless -o is used]
  367:         tools               Build and install tools.
  368:         install=idir        Run "make installworld" to `idir' to install all sets
  369:                 except `etc'.  Useful after "distribution" or "release"
  370:         kernel=conf         Build kernel with config file `conf'
  371:         releasekernel=conf  Install kernel built by kernel=conf to RELEASEDIR.
  372:         sets                Create binary sets in RELEASEDIR/MACHINE/binary/sets.
  373:                 DESTDIR should be populated beforehand.
  374:         sourcesets          Create source sets in RELEASEDIR/source/sets.
  375:         params              Display various make(1) parameters.
  377:      Options:
  378:         -a arch     Set MACHINE_ARCH to arch.  [Default: deduced from MACHINE]
  379:         -B buildId  Set BUILDID to buildId.
  380:         -D dest     Set DESTDIR to dest.  [Default: destdir.MACHINE]
  381:         -E          Set "expert" mode; disables various safety checks.
  382:                     Should not be used without expert knowledge of the build system.
  383:         -j njob     Run up to njob jobs in parallel; see make(1) -j.
  384:         -M obj      Set obj root directory to obj; sets MAKEOBJDIRPREFIX.
  385:                     Unsets MAKEOBJDIR.
  386:         -m mach     Set MACHINE to mach; not required if NetBSD native.
  387:         -N noisy    Set the noisyness (MAKEVERBOSE) level of the build:
  388:                 0   Quiet
  389:                 1   Operations are described, commands are suppressed
  390:                 2   Full output
  391:             [Default: 2]
  392:         -n          Show commands that would be executed, but do not execute them.
  393:         -O obj      Set obj root directory to obj; sets a MAKEOBJDIR pattern.
  394:                     Unsets MAKEOBJDIRPREFIX.
  395:         -o          Set MKOBJDIRS=no; do not create objdirs at start of build.
  396:         -R release  Set RELEASEDIR to release.  [Default: releasedir]
  397:         -r          Remove contents of TOOLDIR and DESTDIR before building.
  398:         -T tools    Set TOOLDIR to tools.  If unset, and TOOLDIR is not set in
  399:                     the environment, nbmake will be (re)built unconditionally.
  400:         -U          Set MKUNPRIVED=yes; build without requiring root privileges,
  401:                 install from an UNPRIVED build with proper file permissions.
  402:         -u          Set MKUPDATE=yes; do not run "make clean" first.
  403:             Without this, everything is rebuilt, including the tools.
  404:         -V v=[val]  Set variable `v' to `val'.
  405:         -w wrapper  Create nbmake script as wrapper.
  406:                     [Default: ${TOOLDIR}/bin/nbmake-${MACHINE}]
  407:         -X x11src   Set X11SRCDIR to x11src.  [Default: /usr/xsrc]
  408:         -x          Set MKX11=yes; build X11R6 from X11SRCDIR
  409:         -Z v        Unset ("zap") variable `v'.
  411: As can be seen, a number of switches can be set to change the standard build
  412: behaviour. A number of them has already been introduced, others can be set as
  413: appropriate.
  415: ### make(1) variables used during build
  417: Several variables control the behaviour of NetBSD builds. Unless otherwise
  418: specified, these variables may be set in either the process environment or in
  419: the [make(1)](
  420: configuration file specified by `MAKECONF`. For a definitive list of these
  421: options, see `BUILDING` and `share/mk/bsd.README` files in the toplevel source
  422: directory.
  424:  * *BUILDID* -- Identifier for the build. The identifier will be appended to
  425:    object directory names, and can be consulted in the
  426:    [make(1)](
  427:    configuration file in order to set additional build parameters, such as
  428:    compiler flags.
  430:  * *DESTDIR* -- Directory to contain the built NetBSD system. If set, special
  431:    options are passed to the compilation tools to prevent their default use of
  432:    the host system's `/usr/include`, `/usr/lib`, and so forth. This pathname
  433:    should not end with a slash (/) character (For installation into the system's
  434:    root directory, set `DESTDIR` to an empty string). The directory must reside
  435:    on a filesystem which supports long filenames and hard links.
  437:    Defaults to an empty string if `USETOOLS` is `yes`; unset otherwise. Note:
  438:    `` will provide a default (destdir.MACHINE in the top-level
  439:    `.OBJDIR`) unless run in `expert` mode.
  441:  * *EXTERNAL\_TOOLCHAIN* -- If defined by the user, points to the root of an
  442:    external toolchain (e.g. `/usr/local/gnu`). This enables the cross-build
  443:    framework even when default toolchain is not available (see
  444:    `TOOLCHAIN_MISSING` below).
  446:    Default: Unset
  448:  * *MAKEVERBOSE* -- The verbosity of build messages. Supported values:
  450:     * `0` -- No descriptive messages are shown.
  451:     * `1` -- Descriptive messages are shown.
  452: 	* `2` -- Descriptive messages are shown (prefixed with a '\#') and command
  453: 	  output is not suppressed.
  455:    Default: 2
  457:  * *MKCATPAGES* -- Can be set to `yes` or `no`. Indicates whether preformatted
  458:    plaintext manual pages will be created during a build.
  460:    Default: `yes`
  462:  * *MKCRYPTO* -- Can be set to `yes` or `no`. Indicates whether cryptographic
  463:    code will be included in a build; provided for the benefit of countries that
  464:    do not allow strong cryptography. Will not affect the standard low-security
  465:    password encryption system,
  466:    [crypt(3)](
  468:    Default: `yes`
  470:  * *MKDOC* -- Can be set to `yes` or `no`. Indicates whether system
  471:    documentation destined for `DESTDIR``/usr/share/doc` will be installed during
  472:    a build.
  474:    Default: `yes`
  476:  * *MKHOSTOBJ* -- Can be set to `yes` or `no`. If set to `yes`, then for
  477:    programs intended to be run on the compile host, the name, release and
  478:    architecture of the host operating system will be suffixed to the name of the
  479:    object directory created by `make obj`. This allows for multiple host systems
  480:    to compile NetBSD for a single target. If set to `no`, then programs built to
  481:    be run on the compile host will use the same object directory names as
  482:    programs built to be run on the target.
  484:    Default: `no`
  486:  * *MKINFO* -- Can be set to `yes` or `no`. Indicates whether GNU info files,
  487:    used for the documentation of most of the compilation tools, will be created
  488:    and installed during a build.
  490:    Default: `yes`
  492:  * *MKLINT* -- Can be set to `yes` or `no`. Indicates whether
  493:    [lint(1)]( will
  494:    be run against portions of the NetBSD source code during the build, and
  495:    whether lint libraries will be installed into `DESTDIR``/usr/libdata/lint`
  497:    Default: `yes`
  499:  * *MKMAN* -- Can be set to `yes` or `no`. Indicates whether manual pages will
  500:    be installed during a build.
  502:    Default: `yes`
  504:  * *MKNLS* -- Can be set to `yes` or `no`. Indicates whether Native Language
  505:    System locale zone files will be compiled and installed during a build.
  507:    Default: `yes`
  509:  * *MKOBJ* -- Can be set to `yes` or `no`. Indicates whether object directories
  510:    will be created when running `make obj`. If set to `no`, then all built files
  511:    will be located inside the regular source tree.
  513:    Default: `yes`
  515:  * *MKPIC* -- Can be set to `yes` or `no`. Indicates whether shared objects and
  516:    libraries will be created and installed during a build. If set to `no`, the
  517:    entire build will be statically linked.
  519:    Default: Platform dependent. As of this writing, all platforms except sh3 default to `yes`
  521:  * *MKPICINSTALL* -- Can be set to `yes` or `no`. Indicates whether the
  522:    [ar(1)]( format
  523:    libraries (`lib*_pic.a`), used to generate shared libraries, are installed
  524:    during a build.
  526:    Default: `yes`
  528:  * *MKPROFILE* -- Can be set to `yes` or `no`. Indicates whether profiled
  529:    libraries (`lib*_p.a`) will be built and installed during a build.
  531:    Default: `yes`; however, some platforms turn off `MKPROFILE` by default at
  532:    times due to toolchain problems with profiled code.
  534:  * *MKSHARE* -- Can be set to `yes` or `no`. Indicates whether files destined to
  535:    reside in `DESTDIR/usr/share` will be built and installed during a build.
  536:    If set to `no`, then all of `MKCATPAGES`, `MKDOC`, `MKINFO`, `MKMAN` and
  537:    `MKNLS` will be set to `no` unconditionally.
  539:    Default: `yes`
  541:  * *MKTTINTERP* -- Can be set to `yes` or `no`. For X builds, decides if the
  542:    TrueType bytecode interpreter is turned on. See
  543:    []( for details.
  545:    Default: `no`
  547:  * *MKUNPRIVED* -- Can be set to `yes` or `no`. Indicates whether an
  548:    unprivileged install will occur. The user, group, permissions and file flags
  549:    will not be set on the installed items; instead the information will be
  550:    appended to a file called `METALOG` in `DESTDIR`. The contents of `METALOG`
  551:    are used during the generation of the distribution tar files to ensure that
  552:    the appropriate file ownership is stored.
  554:    Default:  `no`
  556:  * *MKUPDATE* -- Can be set to `yes` or `no`. Indicates whether all install
  557:    operations intended to write to `DESTDIR` will compare file timestamps before
  558:    installing, and skip the install phase if the destination files are
  559:    up-to-date. This also has implications on full builds (See below).
  561:    Default: `no`
  563:  * *MKX11* -- Can be set to `yes` or `no`. Indicates whether X11R6 is built from
  564:    `X11SRCDIR`.
  566:    Default: `yes`
  568:  * *TOOLDIR* -- Directory to hold the host tools, once built. This directory
  569:    should be unique to a given host system and NetBSD source tree. (However,
  570:    multiple targets may share the same `TOOLDIR`; the target-dependent files
  571:    have unique names). If unset, a default based on the
  572:    [uname(1)](
  573:    information of the host platform will be created in the `.OBJDIR` of `src`.
  575:    Default: Unset.
  577:  * *USETOOLS* -- Indicates whether the tools specified by `TOOLDIR` should be
  578:    used as part of a build in progress. Must be set to `yes` if cross-compiling.
  580:     * `yes` -- Use the tools from `TOOLDIR`.
  581: 	* `no` -- Do not use the tools from `TOOLNAME`, but refuse to build native
  582: 	  compilation tool components that are version-specific for that tool.
  583: 	* `never` -- Do not use the tools from `TOOLNAME`, even when building native
  584: 	  tool components. This is similar to the traditional NetBSD build method,
  585: 	  but does not verify that the compilation tools in use are up-to-date
  586: 	  enough in order to build the tree successfully. This may cause build or
  587: 	  runtime problems when building the whole NetBSD source tree.
  589:    Default: `yes` if building all or part of a whole NetBSD source tree
  590:    (detected automatically); `no` otherwise (to preserve traditional semantics
  591:    of the `bsd.*.mk`
  592:    [make(1)](
  593:    include files).
  595:  * *X11SRCDIR* -- Directory containing the X11R6 source. The main X11R6 source
  596:    is found in `X11SRCDIR/xfree/xc`.
  598:    Default: `usr/xsrc`
  600: The following variables only affect the top level `Makefile` and do not affect
  601: manually building subtrees of the NetBSD source code.
  603:  * *INSTALLWORLDDIR* -- Location for the `make installworld` target to install
  604:    to.
  606:    Default: `/`
  608:  * *MKOBJDIRS* -- Can be set to `yes` or `no`. Indicates whether object
  609:    directories will be created automatically (via a `make obj` pass) at the
  610:    start of a build.
  612:    Default: `no`
  614:  * *MKUPDATE* -- Can be set to `yes` or `no`. If set, then addition to the
  615:    effects described for `MKUPDATE=yes` above, this implies the effect of
  616:    `NOCLEANDIR` (i.e., `make cleandir` is avoided).
  618:    Default: `no`
  620:  * *NOCLEANDIR* -- If set, avoids the `make cleandir` phase of a full build.
  621:    This has the effect of allowing only changed files in a source tree to
  622:    recompiled. This can speed up builds when updating only a few files in the
  623:    tree.
  625:    Default: Unset
  627:  * *NODISTRIBDIRS* -- If set, avoids the `make distrib-dirs` of a full build.
  628:    This skips running
  629:    [mtree(8)]( on
  630:    `DESTDIR`, useful on systems where building as an unprivileged user, or where
  631:    it is known that the system wide mtree files have not changed.
  633:    Default: Unset
  635:  * *NOINCLUDES* -- If set, avoids the `make includes` phase of a full build.
  636:    This has the effect of preventing
  637:    [make(1)]( from
  638:    thinking that some programs are out-of-date simply because system include
  639:    files have changed. However, this option should not be trusted when updating
  640:    the entire NetBSD source tree arbitrarily; it is suggested to use
  641:    `MKUPDATE=yes` in that case.
  643:    Default: Unset
  645:  * *RELEASEDIR* -- If set, specifies the directory to which a
  646:    [release(7)](
  647:    layout will be written at the end of a `make release`.
  649:    Default: Unset
  651:  * *TOOLCHAIN\_MISSING* -- Set to `yes` on platforms for which there is no
  652:    working in-tree toolchain, or if you need/wish using native system toolchain
  653:    (i.e. non-cross tools available via your shell search path).
  655:    Default: depends on target platform; on platforms with in-tree toolchain is set to `no`.

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