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Edited, cleaned up doc.

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Roland Pesch 35 years ago
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      configure.texi

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configure.texi
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@ -3,6 +3,7 @@
@setfilename configure.info
@settitle Cygnus Configure
@c %**end of header
@synindex ky cp
@tex
\def\$#1${{#1}} % Kluge: collect RCS revision info without $...$
\xdef\manvers{\$Revision$} % For use in headers, footers too
@ -167,9 +168,10 @@ the build directory. This shell script, when run from the build
directory, will reconfigure the build directory (but not its
subdirectories). This is most often used to have a @code{Makefile} update
itself automatically if a new source directory is available.
(see @ref{Top, , , bash}.)
@c (see @ref{Top, ,Introduction , bash}.)
@c That's a rather extraordinary xref. What's it meant to clarify
@c ---shell scripts in general??
@c ---shell scripts in general?? Disabled, since we don't seem to have
@c the doc anyhow.
@item Recursion
If the source directory has subdirectories that should also be
@ -374,7 +376,7 @@ using the option @code{-prefix=}.
@subsection Installing for multiple hosts
@cindex Configuring for multiple hosts
@cindex Sharing host independent files
@cindex The datadir directory
@cindex The @file{datadir} directory
@cindex Installing host independent files
By default, host independent files are installed in subdirectories of
@ -546,9 +548,9 @@ through @code{prefix}. The default value for @code{includedir} is
@node Build Directories, Host, Install Locations, Using Configure
@section Build Directories
@cindex Build directories
@cindex objdir
@kindex objdir
@cindex Object directories
@cindex subdirs
@kindex subdirs
@cindex Building for multiple hosts
@cindex Building for multiple targets
@ -658,8 +660,8 @@ than @sc{un*x} had the @sc{gnu} @sc{posix} emulation libraries
available, it would be possible to configure most @sc{gnu} source for a
@sc{posix} system and build it on the obscure host.
For more on this topic, see @ref{Host Environments, , cfg-paper, On
Configuring Development Tools}.
For more on this topic, see @ref{Host Environments, , Host Environments,
cfg-paper, On Configuring Development Tools}.
@node Target, Local Conventions, Host, Using Configure
@section Target
@ -669,8 +671,8 @@ tools, you need not worry about the target. The @emph{target} of a
configuration defaults to the same as the @emph{host}.
For building cross development tools, please see @ref{Building
Development Environments, , cfg-paper, On Configuring Development
Tools}.
Development Environments, , Building Development Environments,
cfg-paper, On Configuring Development Tools}.
@node Local Conventions, , Target, Using Configure
@section Local Conventions
@ -714,31 +716,29 @@ If the program is not target dependent, please consider using
@code{autoconf} instead of Cygnus configure. @code{autoconf} will
be available soon from the @sc{fsf}.
@c ..............................pesch rev..............................
To add Cygnus configure to an existing program, do the following.
To add Cygnus configure to an existing program, do the following:
@table @asis
@item Bring the Makefile up to the standard
@item Make sure the Makefile conforms to @sc{gnu} standard
The coding standard for @sc{gnu} Makefiles is described in
@cite{standards.text}.
@item Add Cygnus extensions to the Makefile
There are described in @ref{Makefile Extensions}.
These are described in @ref{Makefile Extensions}.
@item Move host support from Makefile to fragments
This usually involves finding sections of the Makefile that say things
like ``uncomment these lines for host foo'' and moving them to a new
file call @file{./config/mh-foo}. For more on this, see @ref{Hosts and
Targets}.
file called @file{./config/mh-foo}. For more information, see @ref{Hosts
and Targets}.
@item Choose defaults
If the program has compile time options that determine the way the
program should behave, chose reasonable defaults and make these Makefile
variables. Be sure the variables are assigned their default values
before the @code{####} line so that they can be overridden with site
specific Makefile fragments.
before the @code{####} line so that site specific 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,
@ -747,9 +747,10 @@ the specific instances of those files into the @file{./config}
directory.
@item Separate host and target information
Some programs already have this information separated. If not, you will
need to do so. Host specific information is the information needed to
compile the program. Target specific information it information on the
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}
directory with names that reflect the configuration for which they are
@ -763,7 +764,7 @@ 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 configure.in
@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
@ -771,17 +772,16 @@ instances of those files in @file{./config} to file in the build
directory with more generic names. (see also @ref{Build Directories}).
The format of configure.in is described in @ref{configure.in}.
@item Rename the Makefile to Makefile.in
@item Rename @file{Makefile} to @file{Makefile.in}
@end table
At this point you should have a program that can be configured by Cygnus
configure.
At this point you should have a program that can be configured using
Cygnus @code{configure}.
@node Hosts and Targets, Sites, Programs, Porting
@section Adding hosts and targets
To add a host or target to a program that currently uses Cygnus
To add a host or target to a program that already uses Cygnus
configure, do the following.
@itemize @bullet
@ -804,19 +804,17 @@ represented in the mapping from target configuration names to
configuration files. If not, add it. Also see @ref{configure.in}.
@item
Look in @file{configure.in} for the assignments to the variables
@code{files}, @code{links}, @code{host_makefile_frag}, and
@code{target_makefile_frag}. These are the names of the configuration
files that the program uses. Make sure that copies of the files exist
for your host. If not, create them. See also @ref{Configure
Variables}.
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 that the program uses. Make sure
that copies of the files exist for your host. If not, create them. See
also @ref{Configure Variables}.
@end itemize
This should be enough to configure for a new host or target
configuration name. Getting the program to compile and run properly now
is the hard work of the port.
configuration name. Getting the program to compile and run properly
remains the hard work of the port.
@node Sites, , Hosts and Targets, Porting
@section Adding site info
@ -831,12 +829,12 @@ Choose a name for your site. It must be less than eleven characters for
now.
@item
If the program does not have a @file{./config} directory, create it.
If the program source does not have a @file{./config} directory, create it.
@item
Create a file called @file{./config/ms-@var{site}} where @var{site} is
the name of your site. In it, set the Makefile variables of your
choice.
the name of your site. In it, set whatever Makefile variables you need
to override to match your site's conventions.
@item
Configure the program with:
@ -846,6 +844,7 @@ configure @dots{} +site=@var{site}
@end example
@end itemize
@node Reference, Known Bugs, Porting, top
@chapter Gory details described
@ -869,75 +868,70 @@ The following additions to the @sc{gnu} coding standards are required
for Cygnus configure to work properly.
@itemize @bullet
@item
The Makefile must contain exactly one line starting with @code{####}.
This line should follow any default macro definitions but precede any
rules. Host, target, and site specific Makefile fragments will be
inserted immediately after this line. If the line is missing, the
fragments will not be inserted.
@end itemize
Cygnus adds the following targets to our Makefiles. Their existence is
not required for Cygnus configure but are documented here for
not required for Cygnus configure, but they are documented here for
completeness.
@table @code
@cindex info
@kindex info
@item info
Build all info files from texinfo source.
@cindex install-info
@kindex install-info
@item install-info
Install all info files.
@cindex clean-info
@kindex clean-info
@item clean-info
Remove all info files and any intermediate files that can be generated
from texinfo source.
@cindex stage1
@kindex stage1
@item stage1
@cindex stage2
@item stage2
@cindex stage3
@item stage3
@cindex stage4
@item stage4
@cindex de-stage1
@item de-stage1
@cindex de-stage2
@item de-stage2
@cindex de-stage3
@item de-stage3
@cindex de-stage4
@item de-stage4
@cindex bootstrap
@item bootstrap
@cindex comparison
@item comparison
@cindex Makefile
@item Makefile
@kindex stage2
@itemx stage2
@kindex stage3
@itemx stage3
@kindex stage4
@itemx stage4
@kindex de-stage1
@itemx de-stage1
@kindex de-stage2
@itemx de-stage2
@kindex de-stage3
@itemx de-stage3
@kindex de-stage4
@itemx de-stage4
@kindex bootstrap
@itemx bootstrap
@kindex comparison
@itemx comparison
@kindex Makefile
@itemx Makefile
These targets are in transition and may be removed shortly.
@end table
In addition, the following Makefile targets have revised semantics:
@table @code
@cindex install
@kindex install
@item install
Should @emph{not} depend on the target @code{all}. If the program is
not already built, @code{make install} should fail. This allows
programs to be installed even when @code{make} would otherwise determine
not already built, @code{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 when the result of a @code{make
all} is transported via tape to another machine for installation as
well as in a number of other cases.
@cindex clean
@kindex clean
@item clean
Should remove any file that can be regenerated by the Makefile,
excepting only the Makefile itself, and any links created by configure.
@ -950,91 +944,94 @@ configure @var{host1} ; make all clean ; configure @var{host2} ; make all
@noindent
will fail because of intermediate files intended for @var{host1}.
@end table
Cygnus adds the following macros to all Makefile.in's. Their presence
is not required for Cygnus configure.
Cygnus adds the following macros to all @file{Makefile.in} files, but
you are not required to use them to run Cygnus configure.
@table @code
@cindex docdir
@kindex docdir
@item docdir
The directory in which to install any documentation that is not either a
man page or an info file. For man pages, see mandir, for info, see
infodir.
@cindex includedir
@kindex includedir
@item includedir
The directory in which to install any headers 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
@code{includedir} may be used by @code{cc} as well.
@end table
In addition, the following macros have revised semantics.
In addition, 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
@cindex manext
@kindex manext
@item manext
is not used. The intended usage is not clear. For example, if I have a
is not used. The intended usage is not clear. For example, if you have a
@file{foo.man} and a @file{bar.man}, and @file{foo.man} is destined for
@file{/usr/local/lib/man/man1/foo.1} while @file{bar.man} is destined
for @file{/usr/local/lib/man/man5/bar.5}, then to what should the value
of @code{manext} be set? See also @ref{Install Details}.
for @file{/usr/local/lib/man/man5/bar.5}, then what is the desired value
of @code{manext}?
@cindex datadir
@kindex datadir
@item datadir
is used for @emph{all} host independent files. This makes it possible
to share host independent files across multiple hosts without ersorting
to symlinks or multiple mount points. This also makes it possible
to share host independent files across multiple hosts without resorting
to symbolic links or to multiple mount points. This also makes it possible
build an install tree that contains multiple host binaries, write
the binaries to tape, and extract any of the hosts without extracting
the others.
@cindex mandir
@kindex mandir
@item mandir
man pages are host independent so the default path for @code{mandir}
depends on @code{datadir}.
The default path for @code{mandir} depends on @code{datadir}, since man
pages are host independent.
@cindex infodir
@kindex infodir
@item infodir
info files are host independent so the default path for @code{infodir}
depends on @code{datadir}.
The default path for @code{infodir} depends on @code{datadir}, since
info files are host independent.
@cindex BISON
@kindex BISON
@item BISON
is assumed to have a yacc calling convention. To use
is assumed to have a @code{yacc} calling convention. To use
@code{bison}, use @code{BISON=bison -y}.
@end table
Cygnus also adds the following restrictions on our Makefiles.
Cygnus Makefiles also conform to one additional restriction:
@itemize @bullet
@item
When libraries are installed, the line containing the call to
@code{INSTALL_DATA} should always be followed by a line containing a
call to @code{RANLIB} on the installed library. This is to accomodate
systems that use @code{ranlib}. Systems that do not use ranlib can set
@code{RANLIB} to @code{echo} in a host specific Makefile fragment.
systems that use @code{ranlib}. Systems that do not use @code{ranlib}
can set @code{RANLIB} to @code{echo} in a host specific Makefile
fragment.
@end itemize
@node configure.in, config.status, Makefile Extensions, Reference
@section The format of the configure.in file
@cindex configure.in
A configure.in file for Cygnus configure consists of a declarations
section, followed by a per-host section, followed by a per-target
section, optionally followed by a post-target section. Each section is
a shell script fragment sourced by configure at the appropriate time.
The interface between configure and the shell fragments is through a set
of shell variables. All sections are sourced in the build directory.
@section The format of the @file{configure.in} file
@kindex configure.in
@c "per-invocation" replaced "declaration" below as name of 1st section
@c to conform to usage later in doc.
A @file{configure.in} file for Cygnus 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 sourced by
configure at the appropriate time. The interface between configure and
the shell fragments is through a set of shell variables. All sections
are sourced in the build directory.
@cindex Per-invocation section
The beginning of the @file{configure.in} file begins the per-invocation
section.
@cindex Per-host section
A line beginning with @code{# Per-host:} begins the per-host section.
@ -1049,17 +1046,17 @@ If it exists, the post-target section begins with @code{# Per-target:}.
@menu
* Minimal:: A minimal configure.in
* Configure Variables:: Variables available to configure.in
* Declarations:: Per invocation
* Per-host:: On a host basis
* Per-target:: On a target basis
* Declarations:: For each invocation
* Per-host:: For each host
* Per-target:: For each target
* Post-target:: After each target
* Example:: An example configure.in
@end menu
@node Minimal, Configure Variables, configure.in, configure.in
@subsection A minimal configure.in
@subsection A minimal @file{configure.in}
@cindex Minimal configure.in example
@cindex Minimal @file{configure.in} example
A minimal @file{configure.in} consists of four lines.
@example
@ -1069,12 +1066,12 @@ srcname="source for the foo program"
# Per-target:
@end example
The per-host and per-target lines divide the file into the three
required sections. The srctrigger line names a file. configure checks
to see that this file exists in the source directory before
configuring. If the srctrigger file does not exist, configure
uses the value of srcname to print an error message about not finding
the source.
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 Makefile fragments if they exist.
@ -1082,49 +1079,53 @@ target, and site specific Makefile fragments if they exist.
@node Configure Variables, Declarations, Minimal, configure.in
@subsection Variables available to configure.in
@cindex Configure.in interface
@cindex @file{configure.in} interface
The following variables are available to the shell fragments in
@file{configure.in}.
The following variables pass information between the standard parts of
@code{configure} and the shell-script fragments in @file{configure.in}:
@defvar{srctrigger}
Contains the name of a source file that is expected to live in the
source directory. This is usually set in the declations section of
@file{configure.in}. Configure tests to see that this file exists. If
the file does not exist, configure prints an error message. This is
used as a sanity check that configure.in matches the source directory.
source directory. You must usually set this in the per-invocation
section of @file{configure.in}. Configure tests to see that this file
exists. If the file does not exist, configure prints an error message.
This is used as a sanity check that configure.in matches the source
directory.
@end defvar
@defvar{srcname}
Contains the name of the source contained in the source directory. This
is usually set in the declarations section of @file{configure.in}. If
the file named in @code{srctrigger} does not exist, configure uses the
value of this variable when it prints the error message.
Contains the name of the source collection contained in the source
directory. You must usually set this in the per-invocation section of
@file{configure.in}. If the file named in @code{srctrigger} does not
exist, configure uses the value of this variable when it prints the
error message.
@end defvar
@defvar{configdirs}
Contains the names of any subdirectories on which configure should
recur. This is usually set in the declarations section of
Contains the names of any subdirectories where @code{configure} should
recur. You must usually set this in the per-invocation section of
@file{configure.in}. If @file{Makefile.in} contains a line starting
with @code{SUBDIRS =}, then it will be replaced with an assignment to
@code{SUBDIRS} using the value of @code{configdirs}. 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 this?
@end defvar
NOTE: support for multiple targets is currently suspended.
@defvar{target_dependent}
NOTE: support for multiple targets is currently suspended.
@*
If this variable is not empty and @code{-subdirs} is in effect then
configure will create separate build directories for each target. This
is usually set in the declarations section of @file{configure.in}. The
default is to assume that a directory is target independent, create only
one real directory with symlinks from the other names. This means that
default is to assume that a directory is target independent, and to create
only one real directory with symlinks from the other names. This means that
a target independent directory will be built exactly once regardless of
how many targets are being built.
@end defvar
@defvar{host}
@c 1st ref to "canonical triple". Need explanation, or assume readers know?
Contains the name that the user entered for the host. Since many
things that the user could enter would map to the same canonical triple,
this variable is innappropriate to use for picking available
@ -1146,6 +1147,8 @@ Contains the second element of the canonical triple representing the
host as returned by @file{config.sub}. This is usually used to
distinguish betwen the numerous variations between @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?
@end defvar
@defvar{host_os}
@ -1169,8 +1172,7 @@ programs involved in building programs, like the compiler, assembler,
linker, etc. Most programs will not need the @code{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 are other than that of the system on which the program is
running.
alignment differ from the system where the program is running.
@end defvar
@defvar{target_vendor}
@ -1179,6 +1181,7 @@ target as returned by @file{config.sub}. This is usually used to
distinguish betwen the numerous variations between @emph{common}
operating systems or object file formats. Sometimes it is used to
switch between different flavors of user interfaces.
@c above query re "@emph{common} OS" applies here too
@end defvar
@defvar{target_os}
@ -1201,8 +1204,8 @@ negation.
@defvar{gas}
Is set to @code{true} if the user invoked configure with the @code{-gas}
command line option, otherwise it is empty. This is a request to assume
that all target machines have gas available even if they ordinarily do
not. The converse option, @code{-no-gas} is not available.
that all target machines have @sc{gas} available even if they ordinarily do
not. The converse option @samp{-no-gas} is not available.
@end defvar
@defvar{x}
@ -1212,9 +1215,9 @@ that @sc{mit x11} compatible headers files and libraries are available
on all hosts, regardless of what is normally available on them.
@end defvar
NOTE: support for @code{-subdirs} is at least temporarily suspended.
@defvar{srcdir}
NOTE: support for @code{-subdirs} is at least temporarily suspended.
@*
Is set to the name of the directory containing the source for this
program. This will be different from @file{.} if the user has specified
either the @code{-srcdir=} or the @code{-subdirs} options. Note that
@ -1223,22 +1226,24 @@ either the @code{-srcdir=} or the @code{-subdirs} options. Note that
@defvar{host_makefile_frag}
Is set to a file name representing to the default Makefile fragment for
this host. It may be set in @file{configure.in} to overide this
this host. It may be set in @file{configure.in} to override this
default.
@end defvar
@defvar{target_makefile_frag}
Is set to a file name representing to the default Makefile fragment for
this target. It may be set in @file{configure.in} to overide this
this target. It may be set in @file{configure.in} to override this
default.
@end defvar
@defvar{site_makefile_frag}
@defvar{site_makefile_frag}
Is set to a file name representing to the default Makefile fragment for
this host. It may be set in @file{configure.in} to overide this
this host. It may be set in @file{configure.in} to override this
default. Normally @code{site_makefile_frag} is empty, but will have a
value if the user specified @code{-site=} on the command line. This
variable should probably not be overridden.
value if the user specified @code{-site=} on the command line. 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 defvar
@defvar{Makefile}
@ -1256,65 +1261,65 @@ than creating one.
@defvar{files}
If this variable is non-empty following the @code{per-target:} section,
then each word in it's value will be the target of a symbolic link named
in the @code{links} variable.
then each word in its value will be the target of a symbolic link named
in the corresponding word from the @code{links} variable.
@end defvar
@defvar{links}
If the @code{files} variable is non-empty following the
@code{per-target:} section, then symbolic links will be created with the
first word of links pointing to the first word of files, the second word
of links pointing to the second word of files, and so on.
@code{per-target:} section, then @code{configure} creates symbolic links
with the first word of @code{links} pointing to the first word of
@code{files}, the second word of @code{links} pointing to the second
word of @code{files}, and so on.
@end defvar
@node Declarations, Per-host, Configure Variables, configure.in
@subsection Per invocation
@subsection For each invocation
@cindex Declarations section
Everything from the start of @file{configure.in} up to a line beginning
with @code{# Per-host:} is sourced by configure as a shell script
fragment immediately after parsing command line arguments. The
variables @code{srctrigger} and @code{srcname} @emph{must} be set here.
@code{configure} sources the entire shell script fragment from the start
of @file{configure.in} up to a line beginning with @samp{# Per-host:}
immediately after parsing command line arguments. The variables
@code{srctrigger} and @code{srcname} @emph{must} be set here.
Some other things you might want to set here are the variables
@code{configdirs} or @code{target_dependent}. FIXME-soon.
target_dependent isn't useful without multiple targets.
You might also want to set the variables @code{configdirs} or
@code{target_dependent} here.
@*
FIXME-soon. target_dependent isn't useful without multiple targets.
@node Per-host, Per-target, Declarations, configure.in
@subsection On a host basis
@subsection For each host
@cindex per-host section
@cindex host shell-script fragment
@cindex Per-host section
@cindex Host basis
The per-host section of @file{configure.in} starts with a line beginning
with @code{# Per-host:} and ends before a line beginning with with
@code{# Per-target:}. Configure sources the per-host section once for
The per-host section of @file{configure.in} starts with the line that begins
with @samp{# Per-host:} and ends before a line beginning with
@samp{# Per-target:}. @code{configure} sources the per-host section once for
each host.
This section usually contains a big case statement using the variables
@code{host_cpu}, @code{host_vendor}, and @code{host_os} to determine
appropriate values for @code{host_makefile_frag} and @code{files},
although @code{files} is not usually set here. Usually, it is set
@samp{host_cpu}, @samp{host_vendor}, and @samp{host_os} 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 per-target section after determining the names of the
target specific configuration files.
@node Per-target, Post-target, Per-host, configure.in
@subsection On a target basis
@cindex Per-target section
@cindex Target basis
The per-target section of @file{configure.in} starts with a line
beginning with @code{# Per-target:} and ends before a line beginning
with @code{# Post-target:} if it exists. Otherwise the per-target
section extends to the end of the file. Configure sources the
per-target section once for each target before building any files,
@subsection For each target
@cindex per-target section
@cindex target shell-script fragment
The per-target section of @file{configure.in} starts with the line that
begins with @samp{# Per-target:} and ends before the line that begins
with @samp{# Post-target:}, if there is such a line. Otherwise the
per-target section extends to the end of the file. @code{configure} sources
the per-target section once for each target before building any files,
directories, or links.
This section usually contains a big case statement using the variables
@code{target_cpu}, @code{target_vendor}, and @code{target_os} to determine
appropriate values for @code{target_makefile_frag} and @code{files}.
This section usually contains a big case statement using the variables called
@samp{target_cpu}, @samp{target_vendor}, and @samp{target_os} to determine
appropriate values for @samp{target_makefile_frag} and @samp{files}.
The last lines in the per-target section normally set the variables
@code{files} and @code{links}.
@ -1323,25 +1328,27 @@ The last lines in the per-target section normally set the variables
The post-target section is optional. If it exists, the post-target
section starts with a line beginning with @code{# Post-target:} and
extends to the end of the file. If it exists, configure sources this
extends to the end of the file. If it exists, @code{configure} sources this
section once for each target after building all files, directories, or
links.
This section seldom exists but can be used to munge the configure
generated Makefile.
This section is seldom needed, but you can use it to edit the Makefile
generated by @code{configure}.
@node Example, , Post-target, configure.in
@subsection An example configure.in
@subsection An example @file{configure.in}
@cindex example @file{configure.in}
@cindex sample @file{configure.in}
@cindex Bison @file{configure.in}
@cindex Example configure.in
@cindex Bison configure.in
Here is a small example configure.in.
Here is a small example of a @file{configure.in} file.
@example
# This file is a shell script fragment that supplies the information
# necessary to tailor a template configure script into the configure
# script appropriate for this directory. For more information, check
# any existing configure script.
# This file is a collection of shell script fragments used to tailor
# a template configure script as appropriate for this directory.
# For more information, check any existing configure script.
@c What does "any existing configure script" mean? That if one's been
@c generated here it'll show how the frags are used?
configdirs=
srctrigger=warshall.c
@ -1363,26 +1370,26 @@ links="bison.hairy"
@end example
@node config.status, Makefile Fragments, configure.in, Reference
@section config.status
@section @code{config.status}
@cindex config.status
@kindex config.status
The final step in configuring a directory is to create an executable
shell script call @file{config.status}. This file is typically used to
rebuild the Makefile for the current directory. For this reason,
@file{config.status} uses the @code{-norecursion} option to configure
and is therefor probably inappropriate for reconfiguring a tree
of source code.
shell script, @file{config.status}. The main purpose of this file
is to allow the Makefile for the current directory to rebuild itself, if
necessary. For this reason, @file{config.status} uses the
@samp{-norecursion} option to @code{configure}, and is therefore
probably inappropriate for reconfiguring a tree of source code.
@node Makefile Fragments, , config.status, Reference
@section Makefile Fragments
@cindex Makefile fragments
Cygnus configure uses three types of Makefile fragments. In a
generated Makefile they occur in the order target fragment, host
fragment, and site fragment. This is so host fragments can override
target fragments etc.
Cygnus @code{configure} uses three types of Makefile fragments. In a
generated Makefile they appear in the order target fragment, host
fragment, and site fragment. This allows host fragments to override
target fragments, and site fragments to override both.
Host specific Makefile fragments conventionally reside in the
@file{./config} directory with names of the form
@ -1397,7 +1404,7 @@ They are used for target dependent compile time options.
Site specific Makefile fragments conventionally reside in the
@file{./config} directory with names of the form @file{ms-@var{site}}.
They are used to override host and target independent compile time
options. Note that these options can also be overridden on the
options. Note that you can also overridde these options on the
@code{make} invocation line.
@node Known Bugs, Variables Index, Reference, top
@ -1405,7 +1412,7 @@ options. Note that these options can also be overridden on the
@cindex bugs
The following bugs are known to exist.
We know of the following bugs:
@itemize @bullet

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