321 lines
8.4 KiB
Groff
321 lines
8.4 KiB
Groff
.\" $NetBSD: config.1,v 1.10 2009/08/31 07:45:24 wiz Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)config.8 8.2 (Berkeley) 4/19/94
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.\"
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.Dd September 9, 2007
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.Dt CONFIG 1
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.Os
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.Sh NAME
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.Nm config
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.Nd build kernel compilation directories
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.Sh SYNOPSIS
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.Nm
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.Op Fl Ppv
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.Op Fl b Ar builddir
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.Op Fl s Ar srcdir
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.Op Ar config-file
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.Nm
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.Fl x
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.Op Ar kernel-file
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.Nm
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.Fl L
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.Op Fl v
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.Op Fl s Ar srcdir
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.Op Ar config-file
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.Sh DESCRIPTION
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In its first synopsis form,
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.Nm
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creates a kernel build directory from the machine description file
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.Ar config-file ,
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which describes the system to configure.
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Refer to section
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.Sx KERNEL BUILD CONFIGURATION
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for the details of that use
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of
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.Nm .
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.Pp
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In its second synopsis form,
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.Nm
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takes the binary kernel
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.Ar kernel-file
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as its single argument (aside from the mandatory
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.Fl x
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flag), then extracts the embedded configuration file (if any) and
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writes it to standard output.
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If
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.Ar kernel-file
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is not given,
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.Pa /netbsd
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is used.
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Configuration data will be available if the given kernel was compiled
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with either
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.Va INCLUDE_CONFIG_FILE
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or
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.Va INCLUDE_JUST_CONFIG
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options.
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.Pp
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In its third synopsis form,
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.Nm
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is a tool for the kernel developer and generates a
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.Dq lint
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configuration file to be used during regression testing.
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Refer to section
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.Sx LINT CONFIGURATION
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for the details of that use of
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.Nm .
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.Pp
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.Nm
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accepts the following parameters:
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.Bl -tag -width indent
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.It Fl b Ar builddir
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Use
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.Ar builddir
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as the kernel build directory, instead of computing and creating one
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automatically.
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.It Fl L
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Generate a lint configuration.
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See section
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.Sx LINT CONFIGURATION
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for details.
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.It Fl P
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Pack locators to save space in the resulting kernel binary.
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The amount of space saved that way is so small that this option should
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be considered historical, and of no actual use.
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.It Fl p
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Generate a build directory suited for kernel profiling.
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However, this options should be avoided in favor of the relevant options
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inside the configuration file as described in section
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.Sx KERNEL BUILD CONFIGURATION .
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.It Fl s Ar srcdir
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Point to the top of the kernel source tree.
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It must be an absolute path when
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.Nm
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is used to prepare a kernel build directory, but can be relative
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when it is used in combination with the
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.Fl L
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flag.
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.It Fl v
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Increase verbosity by enabling some more warnings.
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.It Fl x
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Extract the configuration embedded in a kernel binary.
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.El
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.Ss KERNEL BUILD CONFIGURATION
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There are several different ways to run the
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.Nm
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program.
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The traditional way is to run
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.Nm
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from the
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.Pa conf
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subdirectory of the machine-specific directory of the system source
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(usually
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.Pa /sys/arch/MACHINE/conf ,
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where
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.Pa MACHINE
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is one of
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.Pa vax ,
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.Pa hp300 ,
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and so forth), and to specify as the
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.Ar config-file
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the name of a machine description file located in that directory.
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.Nm
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will by default create files in the directory
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.Pa ../compile/SYSTEMNAME ,
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where
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.Pa SYSTEMNAME
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is the last path component of
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.Ar config-file .
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.Nm
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will assume that the top-level kernel source directory is located four
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directories above the build directory.
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.Pp
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Another way is to create the build directory yourself, place the
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machine description file in the build directory with the name
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.Pa CONFIG ,
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and run
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.Nm
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from within the build directory without specifying a
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.Ar config-file .
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.Nm
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will then by default create files in the current directory.
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If you run
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.Nm
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this way, you must specify the location of the top-level kernel source
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directory using the
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.Fl s
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option or by using the
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.Dq Li source
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directive at the beginning of the machine description file.
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.Pp
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Finally, you can specify the build directory for
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.Nm
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and run it from anywhere.
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You can specify a build directory with the
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.Fl b
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option or by using the
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.Dq Li build
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directive at the beginning of the machine description file.
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You must specify the location of the top-level kernel source directory if you
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specify a build directory.
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.Pp
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If
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.Ar config-file
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is a binary kernel,
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.Nm
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will try to extract the configuration file embedded into it, which will
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be present if that kernel was built either with
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.Va INCLUDE_CONFIG_FILE
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or
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.Va INCLUDE_JUST_CONFIG
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options.
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This work mode requires you to manually specify a build directory with
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the
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.Fl b
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option, which implies the need to provide a source tree too.
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.Pp
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If the
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.Fl p
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option is supplied,
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.Pa .PROF
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is appended to the default compilation directory name, and
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.Nm
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acts as if the lines
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.Dq Li makeoptions PROF="-pg"
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and
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.Dq Li options GPROF
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appeared in the machine description file.
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This will build a system that includes profiling code; see
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.Xr kgmon 8
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and
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.Xr gprof 1 .
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The
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.Fl p
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flag is expected to be used for
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.Dq one-shot
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profiles of existing systems; for regular profiling, it is probably
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wiser to create a separate machine description file containing the
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.Li makeoptions
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line.
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.Pp
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The old undocumented
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.Fl g
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flag is no longer supported.
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Instead, use
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.Dq Li makeoptions DEBUG="-g"
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and (typically)
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.Dq Li options KGDB .
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.Pp
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The output of
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.Nm
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consists of a number of files, principally
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.Pa ioconf.c ,
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a description of I/O devices that may be attached to the system; and a
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.Pa Makefile ,
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used by
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.Xr make 1
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in building the kernel.
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.Pp
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After running
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.Nm ,
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it is wise to run
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.Dq Li make depend
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in the directory where the new makefile
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was created.
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.Nm
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prints a reminder of this when it completes.
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.Pp
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If
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.Nm
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stops due to errors, the problems reported should be corrected and
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.Nm
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should be run again.
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.Nm
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attempts to avoid changing the compilation directory
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if there are configuration errors,
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but this code is not well-tested,
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and some problems (such as running out of disk space)
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are unrecoverable.
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.Ss LINT CONFIGURATION
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A so-called
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.Dq lint
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configuration should include everything from the kernel that can
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possibly be selected.
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The rationale is to provide a way to reach all the code a user might
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select, in order to make sure all options and drivers compile without
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error for a given source tree.
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.Pp
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When used with the
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.Fl L
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flag,
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.Nm
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takes the regular configuration file
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.Ar config-file
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and prints on the standard output a configuration file that includes
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.Ar config-file ,
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selects all options and file-systems the user can possibly select,
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and defines an instance of every possible attachment as described by
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the kernel option definition files used by
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.Ar config-file .
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.Pp
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The resulting configuration file is meant as a way to select all
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possible features in order to test that each of them compiles.
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It is not meant to result in a kernel binary that can run on any
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hardware.
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.Pp
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Unlike the first synopsis form, the provided
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.Ar srcdir
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is relative to the current working directory.
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In the first synopsis form, it is relative to the build directory.
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.Sh SEE ALSO
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The SYNOPSIS portion of each device in section 4.
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.\".Rs
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.\" .%T "Building 4.4 BSD Systems with Config"
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.\" .%T "Device Support in 4.4BSD"
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.\".Re
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.Pp
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.Xr options 4 ,
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.Xr config 5 ,
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.Xr config 9
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.1 .
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It was completely revised in
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.Bx 4.4 .
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The
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.Fl x
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option appeared in
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.Nx 2.0 .
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The
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.Fl L
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option appeared in
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.Nx 5.0 .
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