.\" Copyright (c) 2000
.\"	Mike W. Meyer
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
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.\" $FreeBSD$
.\"
.Dd July 23, 2005
.Dt BUILD 7
.Os
.Sh NAME
.Nm build
.Nd information on how to build the system
.Sh DESCRIPTION
The source for the
.Fx
system and applications are contained in three different directories,
normally
.Pa /usr/src ,
.Pa /usr/doc ,
and
.Pa /usr/ports .
.Pa /usr/src
contains the
.Dq "base system"
sources, which is loosely defined as the things required to rebuild
the system to a useful state.
.Pa /usr/doc
contains the source for the system documentation, excluding the manual
pages.
.Pa /usr/ports
is a tree that provides a consistent interface for building and
installing third party applications.
.Pp
The
.Xr make 1
command is used in each of these directories to build and install the
things in that directory.
Issuing the
.Xr 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.
The following
list provides the names and actions for other targets:
.Bl -tag -width indent-two
.It Cm clean
Removes any files created during the build process.
.It Cm install
Installs the results of the build for this directory.
.It Cm update
Gets updated sources as configured in
.Pa /etc/make.conf .
.El
.Pp
The other
.Pa /usr/src
make targets are:
.Bl -tag -width indent-two
.It Cm buildworld
Rebuild everything but the kernel, configure files in
.Pa /etc ,
and release.
.It Cm installworld
Install everything built by
.Cm buildworld .
.It Cm kernel-toolchain                                                        
Rebuild the tools needed for kernel compilation.
Use this if you did do a buildworld first.
.It Cm buildkernel
Rebuild the kernel and the kernel modules.
.It Cm installkernel
Install the kernel and the kernel modules.
.It Cm reinstallkernel .
Reinstall the kernel and the kernel modules.
.It Cm kernel
Equivalent to
.Cm buildkernel
followed by
.Cm installkernel
.It Cm 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.
.It Cm delete-old-libs
Delete obsolete base system libraries interactively.
This should only be used if no 3rd party software uses the libraries anymore.
When -DBATCH_DELETE_OLD_FILES is specified at the command line,
the delete operation will be non-interactive.
.El
.Pp
For more information about the ports build process, see
.Xr ports 7 .
.Sh ENVIRONMENT
.Bl -tag -width ".Va TARGET_ARCH"
.It Va TARGET_ARCH
The target machine processor architecture.
This is analogous to the
.Dq Nm uname Fl p
output.
Set this to cross-build for a different architecture.
.It Va TARGET
The target hardware platform.
This is analogous to the
.Dq Nm uname Fl m
output.
This is necessary to cross-build some target architectures.
For example, cross-building for PC98 machines requires
.Va TARGET_ARCH Ns = Ns Li i386
and
.Va TARGET Ns = Ns Li pc98 .
.It Va NO_WERROR
If defined, warnings will not cause the build to halt, even if the
makefile says otherwise.
.It Va DESTDIR
The directory hierarchy where the resulting binaries will be
installed.
.El
.Sh FILES
.Bl -tag -width ".Pa /usr/share/examples/etc/make.conf" -compact
.It Pa /etc/make.conf
.It Pa /usr/doc/Makefile
.It Pa /usr/doc/share/mk/doc.project.mk
.It Pa /usr/ports/Mk/bsd.port.mk
.It Pa /usr/ports/Mk/bsd.sites.mk
.It Pa /usr/share/examples/etc/make.conf
.It Pa /usr/src/Makefile
.It Pa /usr/src/Makefile.inc1
.El
.Sh EXAMPLES
For an
.Dq approved
method of updating your system from the latest sources,
please see the
.Sx COMMON ITEMS
section in
.Pa src/UPDATING .
.Pp
The following sequence of commands can be used to cross-build the
system for the Alpha architecture on an i386 host:
.Bd -literal -offset indent
cd /usr/src
make TARGET_ARCH=alpha buildworld
make TARGET_ARCH=alpha DESTDIR=/clients/axp installworld
.Ed
.Sh SEE ALSO
.Xr cc 1 ,
.Xr install 1 ,
.Xr make 1 ,
.Xr make.conf 5 ,
.Xr ports 7 ,
.Xr release 7 ,
.Xr config 8 ,
.Xr mergemaster 8 ,
.Xr reboot 8 ,
.Xr shutdown 8
.Sh AUTHORS
.An Mike W. Meyer Aq mwm@mired.org .