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authorMarc Espie <espie@cvs.openbsd.org>2000-09-12 22:26:45 +0000
committerMarc Espie <espie@cvs.openbsd.org>2000-09-12 22:26:45 +0000
commit79a1aac7578f95bec1c4ccb42d72b2fe8bb5c979 (patch)
treea3bcda56100c9436b8d9aff17f03db870aa49da2 /gnu/usr.bin/binutils/etc/configure.texi
parent6f0dcc44234ecb5ec5f57dd9ff28e3d5c40f9e77 (diff)
Resolve other problems that dumb cvs can't find out by itself.
(trivial part done, `interesting' patches remain)
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-\input texinfo @c -*-texinfo-*-
-@setfilename configure.info
-@settitle Cygnus configure
-
-@synindex ky cp
-
-@setchapternewpage odd
-
-@ifinfo
-@format
-START-INFO-DIR-ENTRY
-* configure: (configure). Cygnus configure.
-END-INFO-DIR-ENTRY
-@end format
-@end ifinfo
-
-@ifinfo
-This document describes the Cygnus Support version of @code{configure}.
-
-Copyright (C) 1991, 1992, 1993 Cygnus Support
-Permission is granted to make and distribute verbatim copies of
-this manual provided the copyright notice and this permission notice
-are preserved on all copies.
-
-@ignore
-Permission is granted to process this file through TeX and print the
-results, provided the printed document carries copying permission
-notice identical to this one except for the removal of this paragraph
-(this paragraph not being relevant to the printed manual).
-@end ignore
-
-Permission is granted to copy and distribute modified versions of this
-manual under the conditions for verbatim copying, provided that the entire
-resulting derived work is distributed under the terms of a permission
-notice identical to this one.
-
-Permission is granted to copy and distribute translations of this manual
-into another language, under the above conditions for modified versions,
-except that this permission notice may be stated in a translation approved
-by Cygnus Support.
-@end ifinfo
-
-@c We should not distribute texinfo files with smallbook enabled.
-@c @smallbook
-@finalout
-@titlepage
-@title Cygnus configure
-@author K. Richard Pixley
-@author Cygnus Support
-@page
-@cindex copyleft
-
-@vskip 0pt plus 1filll
-Edited January, 1993, by Jeffrey Osier, Cygnus Support.
-
-Copyright @copyright{} 1991, 1992, 1993 Cygnus Support
-
-Permission is granted to make and distribute verbatim copies of
-this manual provided the copyright notice and this permission notice
-are preserved on all copies.
-
-Permission is granted to copy and distribute modified versions of this
-manual under the conditions for verbatim copying, provided that the entire
-resulting derived work is distributed under the terms of a permission
-notice identical to this one.
-
-Permission is granted to copy and distribute translations of this manual
-into another language, under the above conditions for modified versions,
-except that this permission notice may be stated in a translation approved
-by Cygnus Support.
-@end titlepage
-
-@c ---------------------------------------------------------------------
-@ifinfo
-@node Top
-@top Cygnus configure
-
-This file documents the configuration system used and distributed by
-Cygnus Support.
-
-@menu
-* What configure does:: What configure does
-* Invoking configure:: Invoking configure---basic usage
-* Using configure:: More than you ever wanted to know
-* Porting:: How to use configure with new programs
-* Variables Index::
-* Concept Index::
-@end menu
-@end ifinfo
-
-@c ---------------------------------------------------------------------
-@node What configure does
-@chapter What @code{configure} does
-@cindex Introduction
-@cindex Overview
-@cindex What @code{configure} does
-@kindex Cygnus Support Developer's Kit
-
-This manual documents Cygnus @code{configure}, a program which helps to
-automate much of the setup activity associated with building large suites of
-programs, such the Cygnus Support Developer's Kit. This manual is therefore
-geared toward readers who are likely to face the problem of configuring
-software in source form before compiling and installing it. We assume you are
-an experienced programmer or system administrator.
-@ifinfo
-For further background on this topic, see @ref{Some Basic Terms, , Apologia
-Configure, cfg-paper, On Configuring Development Tools}, by K. Richard
-Pixley.
-@end ifinfo
-@iftex
-For further background on this topic, see @cite{On Configuring Development
-Tools} by K. Richard Pixley.
-@end iftex
-
-When @code{configure} runs, it does the following things:
-
-@table @emph
-@item @bullet{} creates build directories
-@vindex srcdir
-@cindex @code{srcdir}
-@cindex Build directories
-When you run @code{configure} with the @samp{--srcdir} option, it uses the
-current directory as the @dfn{build directory}, creating under it a directory
-tree that parallels the directory structure of the source directory. If you
-don't specify a @samp{srcdir}, @code{configure} first assumes that the source
-code you wish to configure is in your current directory; if it finds no
-@file{configure.in} input file there, it searches in the directory
-@code{configure} itself lies in. (For details, see @ref{Build directories, ,
-Build directories}.)
-
-@item @bullet{} generates @file{Makefile}
-@cindex @code{Makefile} generation
-A @file{Makefile} template from the source directory, usually called
-@file{Makefile.in}, is copied to an output file in the build directory which is
-most often named @file{Makefile}. @code{configure} places definitions for a
-number of standard @file{Makefile} macros at the beginning of the output file.
-If @w{@samp{--prefix=@var{dir}}} or @w{@samp{--exec_prefix=@var{dir}}} are
-specified on the @code{configure} command line, corresponding @file{Makefile}
-variables are set accordingly. If host, target, or site-specific
-@file{Makefile} fragments exist, these are inserted into the output file. (For
-details, see @ref{Makefile generation, , @code{Makefile} generation}.)
-
-@item @bullet{} generates @file{.gdbinit}
-@cindex @code{.gdbinit}
-If the source directory contains a @file{.gdbinit} file and the build directory
-is not the same as the source directory, a @file{.gdbinit} file is created in
-the build directory. This @file{.gdbinit} file contains commands which allow
-the source directory to be read when debugging with the @sc{gnu} debugger,
-@code{gdb}. (@xref{Command Files, , Command Files, gdb, Debugging With GDB}.)
-
-@item @bullet{} makes symbolic links
-@cindex Symbolic links
-Most build directories require that some symbolic links with generic names are
-built pointing to specific files in the source directory. If the system where
-@code{configure} runs cannot support symbolic links, hard links are used
-instead. (For details, see @ref{configure.in, , The @code{configure.in} input
-file}.)
-
-@item @bullet{} generates @file{config.status}
-@cindex @code{config.status}
-@code{configure} creates a shell script named @file{config.status} in the build
-directory. This shell script, when run from the build directory (usually from
-within a @file{Makefile}), will reconfigure the build directory (but not its
-subdirectories). This is most often used to have a @file{Makefile} update
-itself automatically if a new source directory is available.
-
-@item @bullet{} calls itself recursively
-@cindex Recursion
-If the source directory has subdirectories that should also be configured,
-@code{configure} is called for each.
-@end table
-
-@c ---------------------------------------------------------------------
-@node Invoking configure
-@chapter Invoking @code{configure}
-@cindex Invoking @code{configure}
-@cindex Usage
-
-Cygnus @code{configure} is a shell script which resides in a source tree. The
-usual way to invoke @code{configure} is from the shell, as follows:
-
-@cindex Example session
-@example
-eg$ ./configure @var{hosttype}
-@end example
-
-@noindent
-This prepares the source in the current directory (@file{.}) to be
-compiled for a @var{hosttype} environment. It assumes that you wish to
-build programs and files in the default @dfn{build directory} (also the
-current directory, @file{.}). If you do not specify a value for
-@var{hosttype}, Cygnus @code{configure} will attempt to discover this
-information by itself (@pxref{config.guess, , Determining system
-information}). For information on @var{hosttype} environments,
-@xref{Host, , Host}.
-
-All @sc{gnu} software is packaged with one or more @code{configure} script(s)
-(@pxref{Configuration, , How Configuration Should Work, standards, GNU Coding
-Standards}). By using @code{configure} you prepare the source for your
-specific environment by selecting and using @file{Makefile} fragments and
-fragments of shell scripts, which are prepared in advance and stored with the
-source.
-
-@code{configure}'s command-line options also allow you to specify other aspects
-of the source configuration:
-
-@smallexample
- configure @var{hosttype} [--target=@var{target}] [--srcdir=@var{dir}] [--rm]
- [--site=@var{site}] [--prefix=@var{dir}] [--exec-prefix=@var{dir}]
- [--program-prefix=@var{string}] [--tmpdir=@var{dir}]
- [--with-@var{package}[=@var{yes/no}]] [--without-@var{package}]
- [--enable-@var{feature}[=@var{yes/no}]] [--disable-@var{feature}]
- [--norecursion] [--nfp] [-s] [-v] [-V | --version] [--help]
-@end smallexample
-
-@table @code
-@item --target=@var{target}
-@cindex @code{--target}
-@cindex @code{target} option
-@vindex target
-Requests that the sources be configured to target the @var{target} machine. If
-no target is specified explicitly, the target is assumed to be the same as the
-host (i.e., a @dfn{native} configuration). @xref{Host, , Host}, and
-@ref{Target, , Target}, for
-discussions of each.
-
-@item --srcdir=@var{dir}
-@cindex @code{--srcdir}
-@cindex @code{srcdir} option
-@vindex srcdir
-Direct each generated @file{Makefile} to use the sources located in directory
-@var{dir}. Use this option whenever you wish the object code to reside in a
-different place from the source code. The @dfn{build directory} is always
-assumed to be the directory you call @code{configure} from. See @ref{Build
-directories, , Build directories}, for an example. If the source directory is
-not specified, @code{configure} assumes that the source is in your current
-directory. If @code{configure} finds no @file{configure.in} there, it searches
-in the same directory that the @code{configure} script itself lies in.
-Pathnames specified (Values for @var{dir}) can be either absolute relative to
-the @emph{build} directory.
-
-@item --rm
-@cindex @code{--rm}
-@cindex @code{rm} option
-@vindex rm
-@emph{Remove} the configuration specified by @var{hosttype} and the other
-command-line options, rather than create it.
-
-@c FIXME: check @ref
-@quotation
-@emph{Note:} We recommend that you use @samp{make distclean} rather than
-use this option; see @ref{Invoking make,,Invoking @code{make},make,GNU
-Make}, for details on @samp{make distclean}.
-@end quotation
-
-@item --site=@var{site}
-@cindex @code{--site}
-@cindex @code{site} option
-@vindex site
-Generate the @file{Makefile} using site-specific @file{Makefile} fragments for
-@var{site}. @xref{Makefile fragments, , Adding information about local
-conventions}.
-
-@item --prefix=@var{dir}
-@cindex @code{--prefix}
-@cindex @code{prefix} option
-@vindex prefix
-Configure the source to install programs and files under directory @var{dir}.
-
-This option sets the variable @samp{prefix}. Each generated @file{Makefile}
-will have its @samp{prefix} variables set to this value. (@xref{What configure
-really does, , What @code{configure} really does}.)
-
-@item --exec-prefix=@var{dir}
-@cindex @code{--exec-prefix}
-@cindex @code{exec-prefix} option
-@vindex exec-prefix
-Configure the source to install @dfn{host dependent} files in @var{dir}.
-
-This option sets the variable @samp{exec_prefix}. Each generated
-@file{Makefile} will have its @samp{exec_prefix} variables set to this value.
-(@xref{What configure really does, , What @code{configure} really does}.)
-
-@item --program-prefix=@var{string}
-@cindex @code{--program-prefix}
-@cindex @code{program-prefix} option
-@vindex program-prefix
-Configure the source to install certain programs using @var{string} as a
-prefix. This applies to programs which might be used for cross-compilation,
-such as the compiler and the binary utilities, and also to programs which have
-the same names as common Unix programs, such as @code{make}.
-
-This option sets the variable @samp{program_prefix}. Each generated
-@file{Makefile} will have its @samp{program_prefix} variables set to this
-value. (@xref{What configure really does, , What @code{configure} really
-does}.)
-
-@item --tmpdir=@var{tmpdir}
-@cindex @code{--tmpdir}
-@cindex @code{tmpdir} option
-@vindex tmpdir
-Use the directory @var{tmpdir} for @code{configure}'s temporary files. The
-default is the value of the environment variable @w{@code{TMPDIR}}, or
-@file{/tmp} if the environment variable is not set.
-
-@item --with-@var{package}[=@var{yes/no}]
-@itemx --without-@var{package}
-@cindex @code{--with-@var{package}}
-@cindex @code{with-@var{package}} option
-@vindex with-@var{package}
-@cindex @code{--without-@var{package}}
-@cindex @code{without-@var{package}} option
-@vindex without-@var{package}
-Indicate that @var{package} is present, or not present, depending on
-@var{yes/no}. If @var{yes/no} is nonexistent, its value is assumed to be
-@code{yes}. @samp{--without-@var{package}} is equivalent to
-@samp{--with-@var{package}=no}.
-
-For example, if you wish to configure the program @code{gcc} for a Sun
-SPARCstation running SunOS 4.x, and you want @code{gcc} to use the
-@sc{gnu} linker @code{ld}, you can configure @code{gcc} using
-
-@cindex Example session
-@smallexample
-eg$ configure --with-gnu-ld sun4
-@end smallexample
-
-@noindent
-@xref{What configure really does, , What @code{configure} really does}, for
-details. See the installation or release notes for your particular package for
-details on which other @var{package} options are recognized.
-@c FIXME - need to include info about --with-* in other dox!
-
-@item --enable-@var{feature}[=@var{yes/no}]
-@itemx --disable-@var{feature}
-@cindex @code{--enable-@var{feature}}
-@cindex @code{enable-@var{feature}} option
-@vindex enable-@var{feature}
-@cindex @code{--disable-@var{feature}}
-@cindex @code{disable-@var{feature}} option
-@vindex disable-@var{feature}
-Include @var{feature}, or not, depending on @var{yes/no}. If @var{yes/no} is
-nonexistent, its value is assumed to be @code{yes}.
-@samp{--disable-@var{feature}} is equivalent to
-@samp{--enable-@var{feature}=no}.
-
-@noindent
-@xref{What configure really does, , What @code{configure} really does}, for
-details. See the installation or release notes for your particular package for
-details on which other @var{feature} options are recognized.
-@c FIXME - need to include info about --enable-* in other dox!
-
-@item --norecursion
-@cindex @code{--norecursion}
-@cindex @code{norecursion} option
-@vindex norecursion
-Configure only this directory; ignore any subdirectories. This is used by the
-executable shell script @file{config.status} to reconfigure only the current
-directory; it is most often used non-interactively, when @code{make} is
-invoked. (@xref{config.status, , @code{config.status}}.)
-
-@item --nfp
-@cindex @code{--nfp}
-@cindex @code{nfp} option
-@vindex nfp
-Assume that the intended @var{hosttype} has no floating point unit.
-
-@item -s
-@cindex @code{-s}
-@cindex @code{s} option
-Suppress status output. This option is used internally by
-@code{configure} when calling itself recursively in subdirectories. You
-can override this option with the @code{--verbose} option.
-
-@item -v
-@itemx --verbose
-@cindex @code{-v}
-@cindex @code{--verbose}
-@cindex @code{v} option
-@cindex @code{verbose} option
-@cindex Verbose Output
-@vindex verbose
-Print status lines for each directory configured. Normally, only the
-status lines for the initial working directory are printed.
-
-@item --version
-@itemx -V
-@cindex version
-@cindex @code{--version}
-@cindex version
-Print the @code{configure} version number.
-
-@item --help
-@cindex Usage
-@cindex @code{--help}
-@cindex @code{help} option
-Print a short summary of how to invoke @code{configure}.
-@end table
-
-@cindex Abbreviating option names
-@cindex Truncating option names
-@cartouche
-@emph{Note:} You may introduce options with a single dash, @samp{-}, rather
-than two dashes, @samp{--}. However, you may not be able to truncate long
-option names when using a single dash. When using two dashes, options may be
-abbreviated as long as each option can be uniquely identified. For example,
-@smallexample
-eg$ configure --s=/u/me/src @var{hosttype}
-@end smallexample
-@noindent
-is ambiguous, as @w{@samp{--s}} could refer to either @w{@samp{--site}} or
-@w{@samp{--srcdir}}. However,
-@smallexample
-eg$ configure --src=/u/me/src @var{hosttype}
-@end smallexample
-@noindent
-is a valid abbreviation.
-@end cartouche
-
-
-@c ========================================================================
-@node Using configure
-@chapter Using @code{configure}
-@cindex Using @code{configure}
-@cindex Detailed usage
-@cindex Usage: detailed
-
-@code{configure} prepares source directories for building programs in
-them. ``Configuring'' is the process of preparing software to compile
-correctly on a given @dfn{host}, for a given @dfn{target}.
-
-@code{configure} subsequently writes a configured @file{Makefile} from a
-pre-built template; @code{configure} uses variables that have been set in the
-configuring process to determine the values of some variables in the
-@file{Makefile}. Because of this we will refer to both @code{configure}
-variables and @file{Makefile} variables. This convention allows us to
-determine where the variable should be set initially, in either
-@file{configure.in} or @file{Makefile.in}.
-
-@menu
-* What configure really does:: What configure really does
-* configure.in:: The configure.in input file
-* Install locations:: Where to install things once they are built
-* Host:: Telling configure what will source will be built
-* Target:: Telling configure what the source will target
-* Makefile fragments:: Adding information about local conventions
-* Makefile extensions:: Extensions to the GNU coding standards
-@end menu
-
-@c ---------------------------------------------------------------------
-@node What configure really does
-@section What @code{configure} really does
-@cindex What @code{configure} really does
-@cindex Behind the scenes
-@cindex @code{configure} back end
-@cindex @code{configure} details
-
-Cygnus @code{configure} is a shell script that sets up an environment in
-which your programs will compile correctly for your machine and
-operating system, and will install in proper places. @code{configure}
-accomplishes this task by doing the following:
-
-@itemize @bullet
-@item
-it generates a @file{Makefile} from a custom template called
-@file{Makefile.in} in each relevant source directory;
-
-@item
-it customizes the build process to your specifications; you set certain
-variables for @code{configure}, either on the command line or in the
-file @file{configure.in}, which subsequently sets variables in each
-generated @file{Makefile} to be used by @code{make} when actually
-building the software;
-
-@item
-it creates @dfn{build directories}, places for your code to be compiled
-in before being installed;
-
-@item
-it generates a @file{.gdbinit} in the build directory, if needed, to
-communicate to @code{gdb} where to find the program's source code;
-
-@item
-it generates a shell script called @file{config.status}
-which is used most often by the @file{Makefile} to reconfigure itself;
-
-@item
-it recurses in subdirectories, setting up entire trees so that they build
-correctly; if @code{configure} finds another @code{configure} script
-further down in a given source tree, it knows to use this script and not
-recur.
-@end itemize
-
-For the sake of safety (i.e., in order to prevent broken installations), the
-@sc{gnu} coding standards call for software to be @dfn{configured} in such a
-way that an end user trying to build a given package will be able to do so by
-affecting a finite number of variables. All @sc{gnu} software comes with an
-executable @code{configure} shell script which sets up an environment within a
-build directory which will correctly compile your new package for your host
-(or, alternatively, whatever host you specify to @code{configure}).
-@ifinfo
-For further background on this topic, see @ref{Some Basic Terms, , Apologia
-Configure, cfg-paper, On Configuring Development Tools}, by K. Richard
-Pixley.
-@end ifinfo
-@iftex
-For further background on this topic, see @cite{On Configuring Development
-Tools} by K. Richard Pixley.
-@end iftex
-
-Use @code{configure} to set for the build process:
-
-@itemize @bullet
-@item
-correct values for certain variables;
-
-@item
-which type of host you wish to configure a given package for
-(@pxref{Host, , Host});
-
-@item
-where you want to install this package (by using @samp{prefix},
-@samp{exec-prefix} and @samp{program-prefix}; @pxref{Install details, ,
-Full descriptions of all installation directories});
-
-@item
-optionally, which type of machine you wish to @dfn{target} this
-package's output to (@pxref{Target, , Target});
-
-@item
-which other @sc{gnu} packages are already installed and available to
-this particular build (by using the @samp{--with-@var{package}} option;
-@pxref{Invoking configure, , Invoking @code{configure}});
-
-@item
-where to place temporary files (by using the @samp{--tmpdir=@var{dir}}
-option; @pxref{Invoking configure, , Invoking @code{configure}});
-
-@item whether to recur in subdirectories (changeable through the
-@w{@samp{--norecursion}} option; @pxref{Invoking configure, , Invoking
-@code{configure}}).
-@end itemize
-
-@code{configure} uses a few other files to complete its tasks. These are
-discussed in detail where noted.
-
-@table @code
-@cindex Other files
-@item configure.in
-@cindex @code{configure.in} definition
-Input file for @code{configure}. Shell script fragments reside here.
-@xref{configure.in, , The @code{configure.in} input file}.
-
-@item Makefile.in
-@cindex @code{Makefile.in} definition
-Template which @code{configure} uses to build a file called @file{Makefile} in
-the @dfn{build directory}. @xref{Makefile generation, , @code{Makefile}
-generation}.
-
-@item config.sub
-@cindex @code{config.sub} definition
-Shell script used by @code{configure} to expand referents to the
-@var{hosttype} argument into a single specification of the form
-@w{@var{cpu-vendor-os}}. For instance, on the command line you can
-specify
-
-@cindex Example session
-@example
-eg$ ./configure sun4
-@end example
-
-@noindent
-to configure for a Sun SPARCstation running SunOS 4.x. @code{configure}
-consults @code{config.sub} to find that the three-part specification for this
-is
-
-@example
-sparc-sun-sunos4.1.1
-@end example
-
-@noindent
-which notes the @var{cpu} as @samp{sparc}, the @var{manufacturer} as @samp{sun}
-(Sun Microsystems), and the @var{os} (operating system) as @samp{sunos4.1.1},
-the SunOS 4.1.1 release. @xref{configure variables, , Variables available to @code{configure}}.
-
-@item config.guess
-@cindex @code{config.guess} definition
-If you do not put the @var{hosttype} argument on the command line,
-@code{configure} uses the @code{config.guess} shell script to make an
-analysis of your machine (it assumes that you wish to configure your
-software for the type of machine on which you are running). The output
-of @code{config.guess} is a three-part identifier as described above.
-
-@item config.status
-@cindex @code{config.status} definition
-The final step in configuring a directory is to create a shell script,
-@code{config.status}. The main purpose of this file is to allow the
-@file{Makefile} for the current directory to rebuild itself, if
-necessary. @xref{config.status, , @code{config.status}}.
-
-@item config/*
-@cindex @code{config/} subdirectory
-@code{configure} uses three types of @file{Makefile} @dfn{fragments}, which
-reside in the directory @file{@var{srcdir}/config/}. @xref{Makefile fragments,
-, Adding information about local conventions}.
-@end table
-
-@menu
-* Build variables:: Variable-spaghetti made simple
-* Build directories:: Build directories described well
-* Makefile generation:: To build a Makefile
-* config.guess:: Be vewwy quiet, I'm hunting system information
-* config.status:: To rebuild a Makefile
-@end menu
-
-@c ---------------------------------------------------------------------
-@node Build variables
-@subsection Build variables
-@cindex Build variables
-@cindex Cygnus Support Developer's Kit
-@cindex Variables
-
-There are several variables in the build process which you can control through
-build programs such as @code{make}. These include machine definitions, local
-conventions, installation locations, locations for temporary files, etc. This
-data is accessible through certain variables which are configurable in the
-build process; we refer to them as @dfn{build variables}.
-
-For lists of build variables which you can affect by using @code{configure},
-see @ref{configure variables, , Variables available to @code{configure.in}},
-and @ref{Install details, , Full descriptions of all installation directories}.
-
-Generally, build variables, which are used by the @file{Makefile} to
-determine various aspects of the build and installation processes, are
-changeable with command-line options to @code{configure}. In most large
-suites of programs, like the Cygnus Support Developer's Kit, the
-individual programs reside in several subdirectories of a single source
-code ``tree''. All of these subdirectories need to be configured with
-information relative to the @dfn{build directory}, which is not known
-until @code{configure} is run. Unless specified otherwise,
-@code{configure} recursively configures every subdirectory in the source
-tree.
-
-Build variables are passed from @code{configure} directly into the
-@file{Makefile}, and use the same names (except that dashes are
-transformed into underbars; for example, when you specify the option
-@samp{--exec-prefix} on the command line, the @file{Makefile} variable
-@samp{exec_prefix} is set). In other words, if you specify
-
-@cindex Example session
-@example
-eg$ ./configure --prefix=/usr/gnu/local @dots{} @var{hosttype}
-@end example
-
-@noindent
-on the command line, @code{configure} sets an variable called @samp{prefix} to
-@samp{/usr/gnu/local}, and passes this into the @file{Makefile} in the same
-manner. After this command, each @file{Makefile} generated by @code{configure}
-will contain a line that reads:
-
-@example
-prefix = /usr/gnu/local
-@end example
-
-For a list of the @file{Makefile} variables @code{configure} can change, and
-instructions on how to change them, see @ref{configure variables, , Variables
-available to @code{configure.in}}, and @ref{Invoking configure, , Invoking
-@code{configure}}.
-
-@c ---------------------------------------------------------------------
-@node Build directories
-@subsection Build directories
-@cindex Build directories
-@cindex Object directories
-@cindex Building for multiple hosts
-@cindex Building for multiple targets
-
-By default, @code{configure} builds a @file{Makefile} and symbolic links in the
-same directory as the source files. This default works for many cases, but it
-has limitations. For instance, using this approach, you can only build object
-code for one host at a time.
-
-We refer to each directory where @code{configure} builds a @file{Makefile} as
-a @dfn{build directory}.
-
-The build directory for any given build is always the directory from which you
-call @code{configure}, or @file{.} relative to your prompt. The default
-@dfn{source directory}, the place @code{configure} looks to find source code,
-is also @file{.}. For instance, if we have a directory @file{/gnu-stuff/src/}
-that is the top branch of a tree of @sc{gnu} source code we wish to configure,
-then the program we will use to configure this code is
-@file{/gnu-stuff/src/configure}, as follows. (Assume for the sake of argument
-that our machine is a sun4.)
-
-@cindex Example session
-@smallexample
-@group
-eg$ cd /gnu-stuff/src
-eg$ ./configure sun4
-Created "Makefile" in /gnu-stuff/src
-eg$
-@end group
-@end smallexample
-
-We just configured the code in @file{/gnu-stuff/src} to run on a Sun
-SPARCstation using SunOS 4.x by creating a @file{Makefile} in
-@file{/gnu-stuff/src}. By default, we also specified that when this code is
-built, the object code should reside in the same directory,
-@file{/gnu-stuff/src}.
-
-However, if we wanted to build this code for more than one host, we would be in
-trouble, because the new configuration would write over the old one, destroying
-it in the process. What we can do is to make a new @dfn{build directory} and
-configure from there. Running @code{configure} from the new directory will
-place a correct @file{Makefile} and a @file{config.status} in this new file.
-That is all @code{configure} does; we must run @code{make} to generate any
-object code.
-
-The new @file{Makefile} in @file{/gnu-stuff/sun4-obj}, created from the
-template file @file{/gnu-stuff/src/Makefile.in}, contains all the information
-needed to build the program.
-
-@cindex Example session
-@smallexample
-@group
-eg$ mkdir /gnu-stuff/sun4-obj
-eg$ cd /gnu-stuff/sun4-obj
-eg$ ../src/configure --srcdir=../src sun4
-Created "Makefile" in /gnu-stuff/sun4-obj
-eg$ ls
-Makefile config.status
-eg$ make all info install install-info clean
-@var{compilation messages@dots{}}
-eg$ mkdir /gnu-stuff/solaris2
-eg$ cd /gnu-stuff/solaris2
-eg$ ../src/configure --srcdir=../src sol2
-Created "Makefile" in /gnu-stuff/solaris2
-eg$ ls
-Makefile config.status
-eg$ make all info install install-info clean
-@var{compilation messages@dots{}}
-@end group
-@end smallexample
-
-We can repeat this for other configurations of the same software simply
-by making a new build directory and reconfiguring from inside it. If
-you do not specify the @var{hosttype} argument, @code{configure}
-will attempt to figure out what kind of machine and operating system you
-happen to be using. @xref{config.guess, , Determining system
-information}. Of course, this may not always be the configuration you
-wish to build.
-
-@emph{Caution:} If you build more than one configuration for a single program,
-remember that you must also specify a different @samp{--prefix} for each
-configuration at configure-time. Otherwise, both configurations will be
-installed in the same default location (@file{/usr/local}); the configuration
-to be installed last would overwrite previously installed configurations.
-
-@c ---------------------------------------------------------------------
-@node Makefile generation
-@subsection @code{Makefile} generation
-@cindex @code{Makefile} generation
-
-Cygnus @code{configure} creates a file called @file{Makefile} in the build
-directory which can be used with @code{make} to automatically build a given
-program or package. @code{configure} also builds a @file{Makefile} for each
-relevant subdirectory for a given program or package (irrelevant subdirectories
-would be those which contain no code which needs configuring, and which
-therefore have no @code{configure} input file @file{configure.in} and no
-@file{Makefile} template @file{Makefile.in}). @xref{Running, @code{make}
-Invocation, How to Run @code{make}, make, GNU Make}, for details on using
-@code{make} to compile your source code.
-
-Each @file{Makefile} contains variables which have been configured for a
-specific build. These build variables are determined when @code{configure} is
-run. All build variables have defaults. By default, @code{configure}
-generates a @file{Makefile} which specifies:
-
-@cindex Default configuration
-@itemize @bullet
-@item a @dfn{native} build, which is to occur
-
-@item in the current directory, and which will be installed
-
-@item in the default installation directory (@file{/usr/local}) when the code
-is compiled with @code{make}.
-@end itemize
-
-@noindent
-Variables are changeable through command-line options to @code{configure}
-(@pxref{Invoking configure, , Invoking @code{configure}}).
-
-If you are porting a new program and intend to use @code{configure}, see
-@ref{Porting, , Porting with @code{configure}}, as well as @ref{Makefiles, ,
-Writing Makefiles, make, GNU Make}, and @ref{Makefiles, , Makefile Conventions,
-standards, GNU Coding Standards}.
-
-@c ---------------------------------------------------------------------
-@node config.guess
-@subsection Determining system information
-@cindex @code{config.guess}
-
-The shell script @code{config.guess} is called when you do not specify a
-@var{hosttype} on the command line to @code{configure}. @code{config.guess}
-acquires available system information from your local machine through the shell
-command @code{uname}. It compares this information to a database and attempts
-to determine a usable three-part system identifier (known as a @dfn{triple}) to
-use as your @var{hosttype}. @xref{What configure really does, , What
-@code{configure} really does}, to see how this information is used.
-
-@emph{Note:} If you do not specify a @var{hosttype} on the command line,
-@code{configure} will attempt to configure your software to run on the machine
-you happen to be using. This may not be the configuration you desire.
-
-@c ---------------------------------------------------------------------
-@node config.status
-@subsection @code{config.status}
-@cindex @code{config.status}
-
-The final step in configuring a directory is to create an executable shell
-script, @file{config.status}. The main purpose of this file is to allow the
-@file{Makefile} for the current directory to rebuild itself, if necessary. It
-is usually run from within the @file{Makefile}. @xref{Makefile extensions, ,
-Extensions to the @sc{gnu} coding standards}.
-
-@file{config.status} also contains a record of the @code{configure} session
-which created it.
-
-@c ---------------------------------------------------------------------
-@node configure.in
-@section The @code{configure.in} input file
-@cindex @code{configure.in}
-
-A @file{configure.in} file for Cygnus @code{configure} consists of a
-@dfn{per-invocation} section, followed by a @dfn{per-host} section, followed by
-a @dfn{per-target} section, optionally followed by a @dfn{post-target} section.
-Each section is a shell script fragment, which is executed by the
-@code{configure} shell script at an appropriate time. Values are passed among
-@code{configure} and the shell fragments through a set of shell variables.
-When each section is being interpreted by the shell, the shell's current
-directory is the build directory, and any files created by the section (or
-referred to by the section) will be relative to the build directory. To
-reference files in other places (such as the source directory), prepend a shell
-variable such as @samp{$(srcdir)/} to the desired file name.
-
-@cindex @i{per-invocation} section
-The beginning of the @file{configure.in} file begins the @dfn{per-invocation}
-section.
-
-@cindex @i{per-host} section
-A line beginning with @samp{# per-host:} begins the @dfn{per-host} section.
-
-@cindex @i{per-target} section
-A line beginning with @samp{# per-target:} begins the @dfn{per-target} section.
-
-@cindex @i{post-target} section
-If it exists, the @dfn{post-target} section begins with @samp{# post-target:}.
-
-@menu
-* configure variables:: Variables available to configure.in
-* Minimal:: A minimal configure.in
-* Declarations:: For each invocation
-* per-host:: Host-specific instructions
-* per-target:: Target-specific instructions
-* post-target:: Instructions to be executed after target info
-* Example:: An example configure.in
-@end menu
-
-@c ---------------------------------------------------------------------
-@node configure variables
-@subsection Variables available to @code{configure.in}
-@cindex @file{configure.in} interface
-@cindex configure variables
-
-The following variables pass information between the standard parts of
-@code{configure} and the shell-script fragments in @file{configure.in}:
-
-@table @code
-@item srctrigger
-@cindex @code{srctrigger}
-@vindex srctrigger
-Contains the name of a source file that is expected to live in the source
-directory. You must usually set this in the @dfn{per-invocation} section of
-@file{configure.in}. @code{configure} tests to see that this file exists. If
-the file does not exist, @code{configure} prints an error message. This is
-used as a sanity check that @file{configure.in} matches the source directory.
-
-@item srcname
-@cindex @code{srcname}
-@vindex srcname
-Contains the name of the source collection contained in the source directory.
-You must usually set this in the @dfn{per-invocation} section of
-@file{configure.in}. If the file named in @samp{srctrigger} does not exist,
-@code{configure} uses the value of @samp{srcname} when it prints the error
-message.
-
-@item configdirs
-@cindex @code{configdirs}
-@vindex configdirs
-Contains the names of any subdirectories in which @code{configure} should
-recurse. You must usually set this in the @dfn{per-invocation} section of
-@file{configure.in}.
-If @file{Makefile.in} contains a line starting with @samp{SUBDIRS =},
-then it will be replaced with an assignment to @samp{SUBDIRS} using
-the value of @samp{configdirs} (if @samp{subdirs} is empty). This can
-be used to determine which directories to configure and build depending
-on the host and target configurations.
-@c Most other matching makefile/config vars use the same name. Why not
-@c this? (FIXME).
-@c Can we get rid of SUBDIRS-substitution? It doesn't work well with subdirs.
-Use @samp{configdirs} (instead of the @samp{subdirs} variable
-described below) if you want to be able to partition the
-subdirectories, or use independent @file{Makefile} fragments.
-Each subdirectory can be independent, and independently reconfigured.
-
-@item subdirs
-@cindex @code{subdirs}
-@vindex subdirs
-Contains the names of any subdirectories where @code{configure} should create a
-@file{Makefile} (in addition to the current directory), @emph{without}
-recursively running @code{configure}. Use @samp{subdirs} (instead of the
-@samp{configdirs} variable described above) if you want to configure all of the
-directories as a unit. Since there is a single invocation of @code{configure}
-that configures many directories, all the directories can use the same
-@file{Makefile} fragments, and the same @code{configure.in}.
-
-@item host
-@cindex @code{host}
-@cindex Canonical ``triple''
-@vindex host
-Contains the full configuration name for the host (generated by the script
-@file{config.sub} from the name that you entered). This is a three-part
-name (commonly referred to as a @dfn{triple}) of the form
-@var{cpu}-@var{vendor}-@var{os}.
-
-There are separate variables @samp{host_cpu}, @samp{host_vendor}, and
-@samp{host_os} that you can use to test each of the three parts; this variable
-is useful, however, for error messages, and for testing combinations of the
-three components.
-
-@item host_cpu
-@vindex host_cpu
-Contains the first element of the canonical triple representing the host
-as returned by @file{config.sub}. This is occasionally used to
-distinguish between minor variations of a particular vendor's operating
-system and sometimes to determine variations in binary format between
-the host and the target.
-
-@item host_vendor
-@vindex host_vendor
-Contains the second element of the canonical triple representing the host as
-returned by @file{config.sub}. This is usually used to distinguish among the
-numerous variations of @emph{common} operating systems.
-@c "@emph{common} OS" doesn't convey much to me. Is this meant to cover
-@c cases like Unix, widespread but with many variations?
-
-@item host_os
-@vindex host_os
-Contains the the third element of the canonical triple representing the
-host as returned by @file{config.sub}.
-
-@item target
-@cindex @code{target}
-@cindex Canonical ``triple''
-@vindex target
-Contains the full configuration name (generated by the script @file{config.sub}
-from the name that you entered) for the target. Like the host, this is a
-three-part name of the form @var{cpu}-@var{vendor}-@var{os}.
-
-There are separate variables @samp{target_cpu}, @samp{target_vendor}, and
-@samp{target_os} that you can use to test each of the three parts; this
-variable is useful, however, for error messages, and for testing combinations
-of the three components.
-
-@item target_cpu
-@vindex target_cpu
-Contains the first element of the canonical triple representing the target as
-returned by @file{config.sub}. This variable is used heavily by programs which
-are involved in building other programs, like the compiler, assembler, linker,
-etc. Most programs will not need the @samp{target} variables at all, but this
-one could conceivably be used to build a program, for instance, that operated
-on binary data files whose byte order or alignment differ from the system where
-the program is running.
-
-@item target_vendor
-@vindex target_vendor
-Contains the second element of the canonical triple representing the target as
-returned by @file{config.sub}. This is usually used to distinguish among the
-numerous variations of @emph{common} operating systems or object file
-formats. It is sometimes used to switch between different flavors of user
-interfaces.
-@c above query re "@emph{common} OS" applies here too
-
-@item target_os
-@vindex target_os
-Contains the the third element of the canonical triple representing the
-target as returned by @file{config.sub}. This variable is used by
-development tools to distinguish between subtle variations in object
-file formats that some vendors use across operating system releases. It
-might also be use to decide which libraries to build or what user
-interface the tool should provide.
-
-@item floating_point
-@cindex @code{floating_point}
-@cindex @code{nfp} option
-@vindex floating_point
-Set to @samp{no} if you invoked @code{configure} with the @samp{--nfp}
-command-line option, otherwise it is empty. This is a request to target
-machines with @dfn{no floating point} unit, even if the targets ordinarily have
-floating point units available.
-
-@item gas
-@cindex @code{with-gnu-as} option
-@vindex gas
-Set to @samp{true} if you invoked @code{configure} with the
-@w{@samp{--with-gnu-as}} command line option, otherwise it is empty. This is a
-request to assume that the specified @var{hosttype} machine has @sc{gnu} @code{as}
-available even if it ordinarily does not.
-
-@item srcdir
-@cindex @code{srcdir}
-@vindex srcdir
-Set to the name of the directory containing the source for this program.
-This will be different from @file{.} if you have specified the
-@samp{--srcdir=@var{dir}} option. @samp{srcdir} can indicate either an
-absolute path or a path relative to the build directory.
-
-@item package_makefile_frag
-@vindex package_makefile_frag
-If set in @file{configure.in}, this variable should be the name a file relative
-to @samp{srcdir} to be included in the resulting @file{Makefile}. If the named
-file does not exist, @code{configure} will print a warning message. This
-variable is not set by @code{configure}.
-
-@item host_makefile_frag
-@vindex host_makefile_frag
-If set in @file{configure.in}, this variable should be the name a file relative
-to @samp{srcdir} to be included in the resulting @file{Makefile}. If the named
-file does not exist, @code{configure} will print a warning message. This
-variable is not set by @code{configure}.
-
-@item target_makefile_frag
-@vindex target_makefile_frag
-If set in @file{configure.in}, this variable should be the name of a file,
-relative to @samp{srcdir}, to be included in the resulting @file{Makefile}. If
-the named file does not exist, @code{configure} will print a warning message.
-This variable is not set by @code{configure}.
-
-@item site_makefile_frag
-@vindex site_makefile_frag
-Set to a file name representing to the default @file{Makefile} fragment for
-this host. It may be set in @file{configure.in} to override this default.
-Normally @samp{site_makefile_frag} is empty, but will have a value if you
-specify @samp{--site=@var{site}} on the command line.
-@ignore -- this doesn't fit
-It is probably not a good idea to override this variable from
-@file{configure.in}, since that may defeat the @code{configure} user's
-intentions.
-@end ignore
-
-@item Makefile
-@vindex Makefile
-Set to the name of the generated @file{Makefile}. Normally this value is
-precisely @file{Makefile}, but some programs may want something else.
-
-@item removing
-@cindex @code{rm} option
-@vindex removing
-Normally empty but will be set to some non-null value if you specified
-@samp{--rm} on the command line. That is, if @samp{removing} is not empty,
-then @code{configure} is @emph{removing} a configuration rather than creating
-one.
-
-@item files
-@cindex Symbolic links
-@vindex files
-If this variable is not empty following the @dfn{per-target} section,
-then each word in its value will be the target of a symbolic link named
-in the corresponding word from the @samp{links} variable.
-
-@item links
-@cindex Symbolic links
-@vindex links
-If the @samp{files} variable is not empty following the @dfn{per-target}
-section, then @code{configure} creates symbolic links with the first word of
-@samp{links} pointing to the first word of @samp{files}, the second word of
-@samp{links} pointing to the second word of @samp{files}, and so on.
-@end table
-
-@c ---------------------------------------------------------------------
-@node Minimal
-@subsection A minimal @code{configure.in}
-@cindex Minimal @file{configure.in} example
-
-A minimal @file{configure.in} consists of four lines.
-
-@example
-srctrigger=foo.c
-srcname="source for the foo program"
-# per-host:
-# per-target:
-@end example
-
-The @samp{# per-host:} and @samp{# per-target:} lines divide the file into the
-three required sections. The @samp{srctrigger} line names a file.
-@code{configure} checks to see that this file exists in the source directory
-before configuring. If the @samp{srctrigger} file does not exist,
-@code{configure} uses the value of @samp{srcname} to print an error message
-about not finding the source.
-
-This particular example uses no links, and only the default host,
-target, and site-specific @file{Makefile} fragments if they exist.
-
-@c ---------------------------------------------------------------------
-@node Declarations
-@subsection For each invocation
-@cindex For each invocation
-@cindex Declarations section
-@cindex @i{per-invocation} section
-
-@code{configure} invokes the entire shell script fragment from the start of
-@file{configure.in} up to a line beginning with @w{@samp{# per-host:}}
-immediately after parsing command line arguments. The variables
-@samp{srctrigger} and @samp{srcname} @emph{must} be set here.
-
-You might also want to set the variables @samp{configdirs} and
-@samp{package_makefile_frag} here.
-
-@c ---------------------------------------------------------------------
-@node per-host
-@subsection Host-specific instructions
-@cindex Host-specific instructions
-@cindex @i{host} shell-script fragment
-@cindex @i{per-host} section
-
-The @dfn{per-host} section of @file{configure.in} starts with the line that
-begins with @w{@samp{# per-host:}} and ends before a line beginning with
-@w{@samp{# per-target:}}. @code{configure} invokes the commands in the
-@dfn{per-host} section when determining host-specific information.
-
-This section usually contains a big @code{case} statement using the variable
-@samp{host} to determine appropriate values for @samp{host_makefile_frag} and
-@samp{files}, although @samp{files} is not usually set here. Usually, it is
-set at the end of the @dfn{per-target} section after determining the names of
-the target specific configuration files.
-
-@c ---------------------------------------------------------------------
-@node per-target
-@subsection Target-specific instructions
-@cindex Target-specific instructions
-@cindex target shell-script fragment
-@cindex @i{per-target} section
-
-The @dfn{per-target} section of @file{configure.in} starts with the line that
-begins with @w{@samp{# per-target:}} and ends before the line that begins with
-@w{@samp{# post-target:}}, if there is such a line. Otherwise the
-@dfn{per-target} section extends to the end of the file. @code{configure}
-invokes the commands in the @dfn{per-target} section when determining
-target-specific information, and before building any files, directories, or
-links.
-
-This section usually contains a big @code{case} statement using the variable
-@samp{target} to determine appropriate values for @samp{target_makefile_frag}
-and @samp{files}. The last lines in the @dfn{per-target} section normally set
-the variables @samp{files} and @samp{links}.
-
-@c ---------------------------------------------------------------------
-@node post-target
-@subsection Instructions to be executed after target info
-@cindex Post-target shell-script fragment
-@cindex @i{post-target} section
-
-The @dfn{post-target} section is optional. If it exists, the
-@samp{post-target} section starts with a line beginning with @w{@samp{#
-Post-target:}} and extends to the end of the file. If it exists,
-@code{configure} invokes this section once for each target after
-building all files, directories, or links.
-
-This section is seldom needed, but you can use it to edit the @file{Makefile}
-generated by @code{configure}.
-
-@c ---------------------------------------------------------------------
-@node Example
-@subsection An example @code{configure.in}
-@cindex Example @file{configure.in}
-@cindex Sample @file{configure.in}
-@c @cindex @code{bison} @file{configure.in}
-@c this won't be the bison configure.in for long.. need better example
-
-Here is a small example of a @file{configure.in} file.
-
-@cartouche
-@example
-@group
-# This file is a collection of shell script fragments
-# used to tailor a template configure script as
-# appropriate for this directory. For more information,
-# see configure.texi.
-
-configdirs=
-srctrigger=warshall.c
-srcname="bison"
-
-# per-host:
-case "$@{host@}" in
-m88k-motorola-*)
- host_makefile_frag=config/mh-delta88
- ;;
-esac
-
-# per-target:
-files="bison_in.hairy"
-links="bison.hairy"
-
-# post-target:
-@end group
-@end example
-@end cartouche
-
-@c ---------------------------------------------------------------------
-@node Install locations
-@section Install locations
-@cindex Where to install
-@cindex Install locations
-
-Using the default configuration, @samp{make install} creates a single tree of
-files, some of which are programs. The location of this tree is determined by
-the value of the variable @samp{prefix}. The default value of @samp{prefix} is
-@samp{/usr/local}. This is often correct for native tools installed on only
-one host.
-
-@menu
-* prefix:: Changing the default install directory
-* exec_prefix:: How to separate host independent files
- from host dependent files when
- installing for multiple hosts
-* Install details:: Full descriptions of all installation subdirectories
-@end menu
-
-@c ---------------------------------------------------------------------
-@node prefix
-@subsection Changing the default install directory
-@cindex Changing the install directory
-@cindex @code{prefix} option
-@vindex prefix
-
-In the default configuration, all files are installed in subdirectories
-of @file{/usr/local}. The location is determined by the value of
-the @code{configure} variable @samp{prefix}; in turn, this determines the
-value of the @file{Makefile} variable of the same name (@samp{prefix}).
-
-You can also set the value of the @file{Makefile} variable @samp{prefix}
-explicitly each time you invoke @code{make} if you are so inclined. However,
-because many programs have this location compiled in, you must specify the
-@samp{prefix} value consistently on each invocation of @code{make}, or you will
-end up with a broken installation.
-
-To make this easier, the value of the @code{configure} variable
-@samp{prefix} can be set on the command line to @code{configure}
-using the option @samp{--prefix=}.
-
-@c ---------------------------------------------------------------------
-@node exec_prefix
-@subsection Installing for multiple hosts
-@cindex Configuring for multiple hosts
-@cindex Sharing host-independent files
-@cindex Installing host-independent files
-@cindex The @code{exec_prefix} directory
-@vindex exec_prefix
-
-By default, host dependent files are installed in subdirectories of
-@file{$(exec_prefix)}. The location is determined by the value of the
-@code{configure} variable @samp{exec_prefix}, which determines the value of the
-@file{Makefile} variable @samp{exec_prefix}. This makes it easier to install
-for a single host, and simplifies changing the default location for the install
-tree. The default doesn't allow for multiple hosts to effectively share
-host independent files, however.
-
-To configure so that multiple hosts can share common files, use something like:
-
-@cindex Example session
-@smallexample
-configure @var{host1} -prefix=/usr/gnu -exec_prefix=/usr/gnu/H-host1
-make all info install install-info clean
-
-configure @var{host2} -prefix=/usr/gnu -exec_prefix=/usr/gnu/H-host2
-make all info install install-info
-@end smallexample
-
-The first line configures the source for @var{host1} to place host-specific
-programs in subdirectories of @file{/usr/gnu/H-@var{host1}}.
-
-The second line builds and installs all programs for @var{host1},
-including both host-independent and host-specific files, as well as removing
-the host-specific object files from of the build directory.
-
-The third line reconfigures the source for @var{host2} to place host
-specific programs in subdirectories of @file{/usr/gnu/H-@var{host2}}.
-
-The fourth line builds and installs all programs for @var{host2}. Host
-specific files are installed in new directories, but the host
-independent files are installed @emph{on top of} the host
-independent files installed for @var{host1}. This results in a single
-copy of the host independent files, suitable for use by both hosts.
-
-@xref{Makefile extensions, , Extensions to the @sc{gnu} coding standards}, for
-more information.
-
-@c ---------------------------------------------------------------------
-@node Install details
-@subsection Full descriptions of all installation subdirectories
-@cindex Install details
-@cindex Installation subdirectories
-@cindex Subdirectories
-
-During any install, a number of standard directories are created. Their names
-are determined by @file{Makefile} variables. Some of the defaults for
-@file{Makefile} variables can be changed at configuration time using command
-line options to @code{configure}. For more information on the standard
-directories or the @file{Makefile} variables, please refer to @ref{Makefiles, ,
-Makefile Conventions, standards, GNU Coding Standards}. See also @ref{Makefile
-extensions, , Extensions to the @sc{gnu} coding standards}.
-
-Note that @code{configure} does not create the directory indicated by the
-variable @samp{srcdir} at any time. @code{$(srcdir)} is not an installation
-directory.
-
-You can override all @file{Makefile} variables on the command line to
-@code{make}. (@xref{Overriding, , Overriding Variables, make, GNU Make}.) If
-you do so, you will need to specify the value precisely the same way for each
-invocation of @code{make}, or you risk ending up with a broken installation.
-This is because many programs have the locations of other programs or files
-compiled into them. If you find yourself overriding any of the variables
-frequently, you should consider site dependent @file{Makefile} fragments. See
-also @ref{Sites, , Adding site info}.
-
-During @samp{make install}, a number of standard directories are created and
-populated. The following @file{Makefile} variables define them. Those whose
-defaults are set by corresponding @code{configure} variables are marked
-``@code{Makefile} and @code{configure}''.
-
-@table @code
-@item prefix (@code{Makefile} and @code{configure})
-@cindex @code{prefix}
-@vindex prefix
-The root of the installation tree. You can set its @file{Makefile} default
-with the @samp{--prefix=} command line option to @code{configure}
-(@pxref{Invoking configure, , Invoking @code{configure}}). The default value
-for @samp{prefix} is @samp{/usr/local}.
-
-@item bindir
-@cindex @code{bindir}
-@vindex bindir
-A directory for binary programs that users can run. The default value for
-@samp{bindir} depends on @samp{prefix}; @samp{bindir} is normally changed only
-indirectly through @samp{prefix}. The default value for @samp{bindir} is
-@samp{$(prefix)/bin}.
-
-@item exec_prefix (@code{Makefile} and @code{configure})
-@cindex @code{exec_prefix}
-@vindex exec_prefix
-A directory for host dependent files. You can specify the @file{Makefile}
-default value by using the @samp{--exec_prefix=} option to @code{configure}.
-(@xref{Invoking configure, , Invoking @code{configure}}.) The default value
-for @samp{exec_prefix} is @samp{$(prefix)}.
-
-@item libdir
-@cindex @code{libdir}
-@vindex libdir
-A directory for libraries and support programs. The default value for
-@samp{libdir} depends on @samp{prefix}; @samp{libdir} is normally changed only
-indirectly through @samp{prefix}. The default value for @samp{libdir} is
-@samp{$(prefix)/lib}.
-
-@item mandir
-@cindex @code{mandir}
-@vindex mandir
-A directory for @code{man} format documentation (``man pages''). The default
-value for @samp{mandir} depends on @samp{prefix}; @samp{mandir} is normally
-changed only indirectly through @samp{prefix}. The default value for
-@samp{mandir} is @samp{$(prefix)/man}.
-
-@item man@var{N}dir
-@cindex @code{man@var{N}dir}
-@vindex man@var{N}dir
-These are eight variables named @samp{man1dir}, @samp{man2dir}, etc. They name
-the specific directories for each man page section. For example,
-@samp{man1dir} by default holds the filename @file{$(mandir)/man1}; this
-directory contains @file{emacs.1} (the man page for @sc{gnu} Emacs).
-Similarly, @samp{man5dir} contains the value @file{$(mandir)/man5}, indicating
-the directory which holds @file{rcsfile.5} (the man page describing the
-@code{rcs} data file format). The default value for any of the
-@samp{man@var{N}dir} variables depends indirectly on @samp{prefix}, and is
-normally changed only through @samp{prefix}. The default value for
-@samp{man@var{N}dir} is @samp{$(mandir)/man@var{N}}.
-
-@item man@var{N}ext
-@cindex @code{man@var{N}ext}
-@vindex man@var{N}ext
-@emph{Not supported by Cygnus @code{configure}}. The @cite{@sc{gnu} Coding
-Standards} do not call for @samp{man1ext}, @samp{man2ext}, so the intended use
-for @code{manext} is apparently not parallel to @samp{mandir}. Its use is not
-clear. (See also @ref{Makefile extensions, , Extensions to the @sc{gnu} coding
-standards}.)
-
-@item infodir
-@cindex @code{infodir}
-@vindex infodir
-A directory for @code{info} format documentation. The default value for
-@samp{infodir} depends indirectly on @samp{prefix}; @samp{infodir} is
-normally changed only through @samp{prefix}. The default value for
-@samp{infodir} is @samp{$(prefix)/info}.
-
-@item docdir
-@cindex @code{docdir}
-@vindex docdir
-A directory for any documentation that is in a format other than those used by
-@code{info} or @code{man}. The default value for @samp{docdir} depends
-indirectly on @samp{prefix}; @samp{docdir} is normally changed only through
-@samp{prefix}. The default value for @samp{docdir} is @samp{$(datadir)/doc}.
-@emph{This variable is an extension to the @sc{gnu} coding standards}. (See
-also @ref{Makefile extensions, , Extensions to the @sc{gnu} coding standards}.)
-
-@item includedir
-@cindex @code{includedir}
-@vindex includedir
-A directory for the header files accompanying the libraries installed in
-@samp{libdir}. The default value for @samp{includedir} depends on
-@samp{prefix}; @samp{includedir} is normally changed only indirectly
-through @samp{prefix}. The default value for @samp{includedir} is
-@samp{$(prefix)/include}.
-@end table
-
-@c ---------------------------------------------------------------------
-@node Host
-@section Host
-@cindex Host
-
-The arguments to @code{configure} are @dfn{hosttypes}. By
-@dfn{hosttype} we mean the @dfn{environment} in which the source will be
-compiled. This need not necessarily be the same as the physical machine
-involved, although it usually is.
-
-For example, if some obscure machine had the @sc{gnu} @code{POSIX} emulation
-libraries available, it would be possible to configure most @sc{gnu} source for
-a @code{POSIX} system and build it on the obscure host.
-
-For more on this topic, see @ref{Host Environments, On Configuring Development
-Tools, Host Environments, cfg-paper, On Configuring Development Tools}.
-
-@c ---------------------------------------------------------------------
-@node Target
-@section Target
-@cindex Target
-
-For building native development tools, or most of the other @sc{gnu}
-tools, you need not worry about the target. The @dfn{target} of a
-configuration defaults to the same as the @dfn{host}.
-
-For building cross development tools, please see @ref{Building Development
-Environments, On Configuring Development Tools, Building Development
-Environments, cfg-paper, On Configuring Development Tools}.
-
-@c ---------------------------------------------------------------------
-@node Makefile fragments
-@section Adding information about local conventions
-@cindex @code{Makefile} fragments
-@cindex Local conventions
-@cindex Adding local info
-@cindex Adding site info
-
-If you find that a tool does not get configured to your liking, or if
-@code{configure}'s conventions differ from your local conventions, you should
-probably consider @dfn{site-specific @file{Makefile} fragments}. See also
-@ref{Sites, , Adding site info}.
-
-These are probably not the right choice for options that can be set from
-the @code{configure} command line or for differences that are host or
-target dependent.
-
-Cygnus @code{configure} uses three types of @file{Makefile} fragments. In a
-generated @file{Makefile} they appear in the order: @dfn{target fragment},
-@dfn{host fragment}, and @dfn{site fragment}. This allows host fragments to
-override target fragments, and site fragments to override both.
-
-Host-specific @file{Makefile} fragments conventionally reside in the
-@file{./config/} subdirectory with names of the form @file{mh-@var{hosttype}}.
-They are used for hosts that require odd options to the standard compiler and
-for compile time options based on the host configuration.
-
-Target-specific @file{Makefile} fragments conventionally reside in the
-@file{./config/} subdirectory with names of the form @file{mt-@var{target}}.
-They are used for target dependent compile time options.
-
-Site specific @file{Makefile} fragments conventionally reside in the
-@file{./config/} subdirectory with names of the form @file{ms-@var{site}}.
-They are used to override host- and target-independent compile time options.
-Note that you can also override these options on the @code{make} invocation
-line.
-
-@c ---------------------------------------------------------------------
-@node Makefile extensions
-@section Extensions to the @sc{gnu} coding standards
-@cindex @code{Makefile} extensions
-@cindex Cygnus extensions
-@cindex Coding standards extensions
-
-The following additions to the @sc{gnu} coding standards are required for
-Cygnus @code{configure} to work properly.
-
-@itemize @bullet
-@item
-The @file{Makefile} must contain exactly one line starting with @samp{####}.
-This line should follow any default macro definitions but precede any rules.
-Host, target, and site-specific @file{Makefile} fragments will be inserted
-immediately after this line. If the line is missing, the fragments will not be
-inserted.
-
-@item
-Cygnus adds the following targets to each @file{Makefile}. Their existence is
-not required for Cygnus @code{configure}, but they are documented here for
-completeness.
-
-@table @code
-@kindex info
-@item info
-Build all info files from texinfo source.
-
-@kindex install-info
-@item install-info
-Install all info files.
-
-@kindex clean-info
-@item clean-info
-Remove all info files and any intermediate files that can be generated
-from texinfo source.
-
-@kindex Makefile
-@item Makefile
-Calls @code{./config.status} to rebuild the @file{Makefile} in this directory.
-@end table
-
-@item
-The following @file{Makefile} targets have revised semantics:
-
-@table @code
-@kindex install
-@item install
-Should @emph{not} depend on the target @samp{all}. If the program is not
-already built, @samp{make install} should fail. This allows you to install
-programs even when @code{make} would otherwise determine them to be out of
-date. This can happen, for example, when the result of a @samp{make all} is
-transported via tape to another machine for installation.
-
-@kindex clean
-@item clean
-Should remove any file that can be regenerated by the @file{Makefile},
-excepting only the @file{Makefile} itself, and any links created by
-@code{configure}. That is, @code{make all clean} should return all directories
-to their original condition. If this is not done, then the command sequence
-
-@cindex Example session
-@example
-configure @var{host1} ; make all install clean ;
-configure @var{host2} ; make all install
-@end example
-
-@noindent
-will fail because of intermediate files intended for @var{host1}.
-@end table
-
-@item
-Cygnus adds the following macros to all @file{Makefile.in} files, but
-you are not required to use them to run Cygnus @code{configure}.
-
-@table @code
-@kindex docdir
-@item docdir
-The directory in which to install any documentation that is not either a
-@code{man} page or an @code{info} file. For @code{man} pages, see
-@samp{mandir}; for @code{info}, see @samp{infodir}.
-
-@kindex includedir
-@item includedir
-The directory in which to install any header files that should be made
-available to users. This is distinct from the @code{gcc} include directory,
-which is intended for @code{gcc} only. Files in @samp{includedir} may be used
-by @code{cc} as well.
-@end table
-
-@item
-The following macros have revised semantics. Most of them describe
-installation directories; see also @ref{Install details, , Full description of
-all installation subdirectories}.
-
-@table @code
-@kindex datadir
-@item datadir
-is used for host independent data files.
-
-@kindex mandir
-@item mandir
-The default path for @samp{mandir} depends on @samp{prefix}.
-
-@kindex infodir
-@item infodir
-The default path for @samp{infodir} depends on @samp{prefix}.
-
-@kindex BISON
-@item BISON
-is assumed to have a @code{yacc} calling convention. To use @sc{gnu}
-@code{bison}, use @samp{BISON=bison -y}.
-@end table
-
-@item
-Each Cygnus @file{Makefile} also conforms to one additional restriction:
-
-When libraries are installed, the line containing the call to
-@samp{INSTALL_DATA} should always be followed by a line containing a call to
-@samp{RANLIB} on the installed library. This is to accommodate systems that
-use @code{ranlib}. Systems that do not use @code{ranlib} can set @samp{RANLIB}
-to ``@code{echo}'' in a host specific @file{Makefile} fragment.
-@end itemize
-
-@c ========================================================================
-@node Porting
-@chapter Porting with @code{configure}
-@cindex Porting with @code{configure}
-
-This section explains how to add programs, host and target configuration
-names, and site-specific information to Cygnus @code{configure}.
-
-@menu
-* Programs:: Adding configure to new programs
-* Hosts and targets:: Adding hosts and targets
-* Sites:: Adding site info
-@end menu
-
-@c ---------------------------------------------------------------------
-@node Programs
-@section Adding @code{configure} to new programs
-@cindex Adding @code{configure} to new programs
-
-If you are writing a new program, you probably shouldn't worry about porting or
-configuration issues until it is running reasonably on some host. Then refer
-back to this section.
-
-If your program currently has a @code{configure} script that meets the @sc{gnu}
-standards (@pxref{Configuration, , How Configuration Should Work, standards,
-GNU Coding Standards}, please do not add Cygnus @code{configure}. It should be
-possible to add this program without change to a Cygnus @code{configure} style
-source tree.
-
-@cindex @code{autoconf}
-If the program is not target dependent, please consider using @code{autoconf}
-instead of Cygnus @code{configure}. @code{autoconf} is available from the Free
-Software Foundation; it is a program which generates an executable shell script
-called @file{configure} by automatically finding information on the system to
-be configured on and embedding this information in the shell script.
-@file{configure} scripts generated by @code{autoconf} require no arguments, and
-accept the same options as Cygnus @code{configure}. For detailed instructions
-on using @code{autoconf}, see @ref{Making configure Scripts, , How to organize
-and produce Autoconf scripts, autoconf, Autoconf}.
-
-
-To add Cygnus @code{configure} to an existing program, do the following:
-
-@table @bullet
-@item Make sure the @file{Makefile} conforms to the @sc{gnu} standard
-The coding standard for writing a @sc{gnu} @file{Makefile} is described in
-@ref{Makefiles, , Makefile Conventions, standards, GNU Coding Standards}. For
-technical information on writing a @file{Makefile}, see @ref{Makefiles, ,
-Writing Makefiles, make, GNU Make}.
-
-@item Add Cygnus extensions to the @file{Makefile}
-These are described in @ref{Makefile extensions, , Extensions to the @sc{gnu}
-coding standards}.
-
-@item Collect package specific definitions in a single file
-Many packages are best configured using a common @file{Makefile} fragment which
-is included by all of the makefiles in the different directories of the
-package. In order to accomplish this, set the variable
-@samp{package_makefile_fragment} to the name of the file. It will be inserted
-into the final @file{Makefile} before the target-specific fragment.
-
-@item Move host support from @file{Makefile} to fragments
-This usually involves finding sections of the @file{Makefile} that say things
-like ``uncomment these lines for host @var{hosttype}'' and moving them to a new
-file called @file{./config/mh-@var{hosttype}}. For more information, see @ref{Hosts
-and targets, , Adding hosts and targets}.
-
-@item Choose defaults
-If the program has compile-time options that determine the way the program
-should behave, choose reasonable defaults and make these @file{Makefile}
-variables. Be sure the variables are assigned their default values before the
-@samp{####} line so that site-specific @file{Makefile} fragments can override
-them (@pxref{Makefile extensions, , Extensions to the @sc{gnu} coding
-standards}).
-
-@item Locate configuration files
-If there is configuration information in header files or source files, separate
-it in such a way that the files have generic names. Then move the specific
-instances of those files into the @file{./config/} subdirectory.
-
-@item Separate host and target information
-Some programs already have this information separated. If yours does not, you
-will need to separate these two kinds of configuration information. @dfn{Host
-specific} information is the information needed to compile the program.
-@dfn{Target specific} information is information on the format of data files
-that the program will read or write. This information should live in separate
-files in the @file{./config/} subdirectory with names that reflect the
-configuration for which they are intended.
-
-At this point you might skip this step and simply move on. If you do, you
-should end up with a program that can be configured only to build @dfn{native}
-tools, that is, tools for which the host system is also the target system.
-Later, you could attempt to build a cross tool and separate out the
-target-specific information by figuring out what went wrong. This is often
-simpler than combing through all of the source code.
-
-@item Write @code{configure.in}
-Usually this involves writing shell script fragments to map from canonical
-configuration names into the names of the configuration files. These files
-will then be linked at configure time from the specific instances of those
-files in @file{./config} to files in the build directory with more generic
-names. (See also @ref{Build directories, , Build directories}.) The format of
-@file{configure.in} is described in @ref{configure.in, , The
-@code{configure.in} input file}.
-
-@item Rename @file{Makefile} to @file{Makefile.in}
-@end table
-
-At this point you should have a program that can be configured using
-Cygnus @code{configure}.
-
-@c ---------------------------------------------------------------------
-@node Hosts and targets
-@section Adding hosts and targets
-@cindex Adding hosts and targets
-@cindex Hosts and targets
-
-To add a host or target to a program that already uses Cygnus @code{configure},
-do the following.
-
-@itemize @bullet
-
-@item
-Make sure the new configuration name is represented in @file{config.sub}. If
-not, add it. For more details, see the comments in the shell script
-@file{config.sub}.
-
-@item
-If you are adding a host configuration, look in @file{configure.in}, in the
-@dfn{per-host} section. Make sure that your configuration name is represented
-in the mapping from host configuration names to configuration files. If not,
-add it. Also see @ref{configure.in, , The @code{configure.in} input file}.
-
-@item
-If you are adding a target configuration, look in @file{configure.in}, in the
-@dfn{per-target} section. Make sure that your configuration name is
-represented in the mapping from target configuration names to configuration
-files. If not, add it. Also see @ref{configure.in, , The @code{configure.in}
-input file}.
-
-@item
-Look in @file{configure.in} for the variables @samp{files}, @samp{links},
-@samp{host_makefile_frag}, and @samp{target_makefile_frag}. The values
-assigned to these variables are the names of the configuration files, (relative
-to @samp{srcdir}) that the program uses. Make sure that copies of the files
-exist for your host. If not, create them. See also @ref{configure variables,
-, Variables available to @code{configure.in}}.
-@end itemize
-
-This should be enough to @code{configure} for a new host or target
-configuration name. Getting the program to compile and run properly represents
-the hardest work of any port.
-
-@c ---------------------------------------------------------------------
-@node Sites
-@section Adding site info
-@cindex Sites
-@cindex Adding site info
-
-If some of the @file{Makefile} defaults are not right for your site, you can
-build site-specific @file{Makefile} fragments. To do this, do the following.
-
-@itemize @bullet
-
-@item
-Choose a name for your site. It must currently be less than eleven characters.
-
-@item
-If the program source does not have a @file{./config/} subdirectory, create it.
-
-@item
-Create a file called @file{./config/ms-@var{site}} where @var{site} is the name
-of your site. In it, set whatever @file{Makefile} variables you need to
-override to match your site's conventions.
-
-@item
-Configure the program with:
-
-@cindex Example session
-@example
-configure @dots{} --site=@var{site}
-@end example
-
-@end itemize
-
-@c ---------------------------------------------------------------------
-@node Variables Index
-@unnumbered Variable Index
-
-@printindex vr
-
-@page
-@c ---------------------------------------------------------------------
-@node Concept Index
-@unnumbered Concept Index
-
-@printindex cp
-@contents
-@bye
-
-@c Local Variables:
-@c fill-column: 79
-@c outline-regexp: "@chap"
-@c End:
-@c (setq outline-regexp "@chapt\\\|@unnum\\\|@setf\\\|@conte\\\|@sectio\\\|@subsect\\\|@itemize\\\|@defvar{")
-