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BUILD(7)           FreeBSD Miscellaneous Information Manual           BUILD(7)

NAME
     build - information on how to build the system

DESCRIPTION
     The sources for the FreeBSD system and its applications are contained in
     three different directories, normally /usr/src, /usr/doc, and /usr/ports.
     Directory /usr/src contains the ``base system'' sources, which is loosely
     defined as the things required to rebuild the system to a useful state.
     Directory /usr/doc contains the source for the system documentation,
     excluding the manual pages.  Directory /usr/ports contains a tree that
     provides a consistent interface for building and installing third party
     applications.  For more information about the ports build process, see
     ports(7).

     The make(1) command is used in each of these directories to build and
     install the things in that directory.  Issuing the make(1) command in any
     directory or subdirectory of those directories has the same effect as
     issuing the same command in all subdirectories of that directory.  With
     no target specified, the things in that directory are just built.

     A source tree is allowed to be read-only.  As described in make(1),
     objects are usually built in a separate object directory hierarchy
     specified by the environment variable MAKEOBJDIRPREFIX, or under /usr/obj
     if variable MAKEOBJDIRPREFIX is not set.  For a given source directory,
     its canonical object directory would be ${MAKEOBJDIRPREFIX}${.CURDIR} if
     make(1) variable MAKEOBJDIRPREFIX is set, or /usr/obj${.CURDIR} if this
     variable is not set.  Cross-builds set the object directory as described
     in the documentation for the buildworld target below.

     The build may be controlled by defining make(1) variables described in
     the ENVIRONMENT section below, and by the variables documented in
     make.conf(5).

     The following list provides the names and actions for the targets
     supported by the build system:

     clean            Remove any files created during the build process.

     cleandepend      Remove the file ${.OBJDIR}/${DEPENDFILE} generated by a
                      prior ``make depend'' step.

     cleandir         Remove the canonical object directory if it exists, or
                      perform actions equivalent to ``make clean cleandepend''
                      if it does not.  This target will also remove an obj
                      link in ${.CURDIR} if that exists.

                      It is advisable to run ``make cleandir'' twice: the
                      first invocation will remove the canonical object
                      directory and the second one will clean up ${.CURDIR}.

     depend           Generate a list of build dependencies in file
                      ${.OBJDIR}/${DEPENDFILE}.

     install          Install the results of the build to the appropriate
                      location in the installation directory hierarchy
                      specified in variable DESTDIR.

     obj              Create the canonical object directory associated with
                      the current directory.

     objlink          Create a symbolic link to the canonical object directory
                      in ${.CURDIR}.

     tags             Generate a tags file using the program specified in the
                      make(1) variable CTAGS.  The build system supports
                      ctags(1) and GNU Global.

     The other supported targets under directory /usr/src are:

     buildenv             Spawn an interactive shell with environment
                          variables set up for cross-building the system.  The
                          target architecture needs to be specified with
                          make(1) variables TARGET_ARCH and TARGET.

                          This target is only useful after a complete cross-
                          toolchain including the compiler, linker, assembler,
                          headers and libraries has been built; see the
                          toolchain target below.

     buildworld           Build everything but the kernel, configure files in
                          etc, and release.  The actual build location prefix
                          used is ${MAKEOBJDIRPREFIX}${.CURDIR} for native
                          builds, and ${MAKEOBJDIRPREFIX}/${TARGET}${.CURDIR}
                          for cross builds and native builds with variable
                          CROSS_BUILD_TESTING set.

     cleanworld           Attempt to clean up targets built by a preceding
                          buildworld step.

     distributeworld      Distribute everything compiled by a preceding
                          buildworld step.  Files are placed in the directory
                          hierarchy specified by make(1) variable DISTDIR.
                          This target is used while building a release; see
                          release(7).

     installworld         Install everything built by a preceding buildworld
                          step into the directory hierarchy pointed to by
                          make(1) variable DESTDIR.

                          If installing onto an NFS file system and running
                          make(1) with the -j option, make sure that
                          rpc.lockd(8) is running on both client and server.
                          See rc.conf(5) on how to make it start at boot time.

     toolchain            Create the build toolchain needed to build the rest
                          of the system.  For cross-architecture builds, this
                          step creates a cross-toolchain.

     universe             Execute a buildworld and buildkernel for all kernels
                          including LINT, for each architecture supported by
                          the build system.  This command takes a long time.

     update               Get updated sources as configured in make.conf(5).

     Kernel specific build targets in /usr/src are:

     buildkernel          Rebuild the kernel and the kernel modules.

     installkernel        Install the kernel and the kernel modules to
                          directory ${DESTDIR}/boot/kernel, renaming any pre-
                          existing directory with this name to kernel.old if
                          it contained the currently running kernel.  The
                          target directory under ${DESTDIR} may be modified
                          using the INSTKERNNAME and KODIR make(1) variables.

     kernel               Equivalent to buildkernel followed by installkernel

     kernel-toolchain     Rebuild the tools needed for kernel compilation.
                          Use this if you did not do a buildworld first.

     reinstallkernel      Reinstall the kernel and the kernel modules,
                          overwriting the contents of the target directory.
                          As with the installkernel target, the target
                          directory can be specified using the make(1)
                          variable INSTKERNNAME.

     Convenience targets for cleaning up the install destination directory
     denoted by variable DESTDIR include:

     check-old            Print a list of old files and directories in the
                          system.

     delete-old           Delete obsolete base system files and directories
                          interactively.  When -DBATCH_DELETE_OLD_FILES is
                          specified at the command line, the delete operation
                          will be non-interactive.  The variables DESTDIR,
                          TARGET_ARCH and TARGET should be set as with ``make
                          installworld''.

     delete-old-libs      Delete obsolete base system libraries interactively.
                          This target should only be used if no 3rd party
                          software uses these libraries.  When
                          -DBATCH_DELETE_OLD_FILES is specified at the command
                          line, the delete operation will be non-interactive.
                          The variables DESTDIR, TARGET_ARCH and TARGET should
                          be set as with ``make installworld''.

ENVIRONMENT
     Variables that influence all builds include:

     DESTDIR               The directory hierarchy prefix where built objects
                           will be installed.  If not set, DESTDIR defaults to
                           the empty string.

     MAKEOBJDIRPREFIX      Defines the prefix for directory names in the tree
                           of built objects.  Defaults to /usr/obj if not
                           defined.  This variable should only be set in the
                           environment and not via /etc/make.conf or the
                           command line.

     NO_WERROR             If defined, compiler warnings will not cause the
                           build to halt, even if the makefile says otherwise.

     Additionally, builds in /usr/src are influenced by the following make(1)
     variables:

     LOCAL_DIRS           If set, this variable supplies a list of additional
                          directories to build, relative to the root of the
                          source tree.

     SUBDIR_OVERRIDE      Override the default list of sub-directories and
                          only build the sub-directory named in this variable.
                          This variable is useful when debugging failed
                          builds.

                                make some-target SUBDIR_OVERRIDE=foo/bar

     TARGET               The target hardware platform.  This is analogous to
                          the ``uname -m'' output.  This is necessary to
                          cross-build some target architectures.  For example,
                          cross-building for PC98 machines requires
                          TARGET_ARCH=i386 and TARGET=pc98.  If not set,
                          TARGET defaults to the current hardware platform.

     TARGET_ARCH          The target machine processor architecture.  This is
                          analogous to the ``uname -p'' output.  Set this to
                          cross-build for a different architecture.  If not
                          set, TARGET_ARCH defaults to the current machine
                          architecture.

     Builds under directory /usr/doc are influenced by the following make(1)
     variables:

     DOC_LANG      If set, restricts the documentation build to the language
                   subdirectories specified as its content.  The default
                   action is to build documentation for all languages.

FILES
     /usr/doc/Makefile
     /usr/doc/share/mk/doc.project.mk
     /usr/ports/Mk/bsd.port.mk
     /usr/ports/Mk/bsd.sites.mk
     /usr/share/examples/etc/make.conf
     /usr/src/Makefile
     /usr/src/Makefile.inc1

EXAMPLES
     For an ``approved'' method of updating your system from the latest
     sources, please see the COMMON ITEMS section in src/UPDATING.

     The following sequence of commands can be used to cross-build the system
     for the sparc64 architecture on an i386 host:

           cd /usr/src
           make TARGET_ARCH=sparc64 buildworld
           make TARGET_ARCH=sparc64 DESTDIR=/clients/sparc64 installworld

SEE ALSO
     cc(1), install(1), make(1), make.conf(5), src.conf(5), ports(7),
     release(7), config(8), mergemaster(8), reboot(8), shutdown(8)

AUTHORS
     Mike W. Meyer <mwm@mired.org>.

FreeBSD 11.0-PRERELEASE         October 1, 2006        FreeBSD 11.0-PRERELEASE

NAME | DESCRIPTION | ENVIRONMENT | FILES | EXAMPLES | SEE ALSO | AUTHORS

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