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GNU Info File
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1994-12-15
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This is Info file configure.info, produced by Makeinfo-1.55 from the
input file ./configure.texi.
START-INFO-DIR-ENTRY
* configure: (configure). Cygnus configure.
END-INFO-DIR-ENTRY
This document describes the Cygnus Support version of `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.
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.
File: configure.info, Node: Makefile fragments, Next: Makefile extensions, Prev: Target, Up: Using configure
Adding information about local conventions
==========================================
If you find that a tool does not get configured to your liking, or if
`configure''s conventions differ from your local conventions, you should
probably consider "site-specific `Makefile' fragments". See also *Note
Adding site info: Sites.
These are probably not the right choice for options that can be set
from the `configure' command line or for differences that are host or
target dependent.
Cygnus `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
`./config/' subdirectory with names of the form `mh-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 `Makefile' fragments conventionally reside in the
`./config/' subdirectory with names of the form `mt-TARGET'. They are
used for target dependent compile time options.
Site specific `Makefile' fragments conventionally reside in the
`./config/' subdirectory with names of the form `ms-SITE'. They are
used to override host- and target-independent compile time options.
Note that you can also override these options on the `make' invocation
line.
File: configure.info, Node: Makefile extensions, Prev: Makefile fragments, Up: Using configure
Extensions to the GNU coding standards
======================================
The following additions to the GNU coding standards are required for
Cygnus `configure' to work properly.
* The `Makefile' must contain exactly one line starting with `####'.
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.
* Cygnus adds the following targets to each `Makefile'. Their
existence is not required for Cygnus `configure', but they are
documented here for completeness.
`info'
Build all info files from texinfo source.
`install-info'
Install all info files.
`clean-info'
Remove all info files and any intermediate files that can be
generated from texinfo source.
`Makefile'
Calls `./config.status' to rebuild the `Makefile' in this
directory.
* The following `Makefile' targets have revised semantics:
`install'
Should *not* depend on the target `all'. If the program is
not already built, `make install' should fail. This allows
you to install programs even when `make' would otherwise
determine them to be out of date. This can happen, for
example, when the result of a `make all' is transported via
tape to another machine for installation.
`clean'
Should remove any file that can be regenerated by the
`Makefile', excepting only the `Makefile' itself, and any
links created by `configure'. That is, `make all clean'
should return all directories to their original condition.
If this is not done, then the command sequence
configure HOST1 ; make all install clean ;
configure HOST2 ; make all install
will fail because of intermediate files intended for HOST1.
* Cygnus adds the following macros to all `Makefile.in' files, but
you are not required to use them to run Cygnus `configure'.
`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'.
`includedir'
The directory in which to install any header files that
should be made available to users. This is distinct from the
`gcc' include directory, which is intended for `gcc' only.
Files in `includedir' may be used by `cc' as well.
* The following macros have revised semantics. Most of them describe
installation directories; see also *Note Full description of all
installation subdirectories: Install details.
`datadir'
is used for host independent data files.
`mandir'
The default path for `mandir' depends on `prefix'.
`infodir'
The default path for `infodir' depends on `prefix'.
`BISON'
is assumed to have a `yacc' calling convention. To use GNU
`bison', use `BISON=bison -y'.
* Each Cygnus `Makefile' also conforms to one additional restriction:
When libraries are installed, the line containing the call to
`INSTALL_DATA' should always be followed by a line containing a
call to `RANLIB' on the installed library. This is to accommodate
systems that use `ranlib'. Systems that do not use `ranlib' can
set `RANLIB' to "`echo'" in a host specific `Makefile' fragment.
File: configure.info, Node: Porting, Next: Variables Index, Prev: Using configure, Up: Top
Porting with `configure'
************************
This section explains how to add programs, host and target
configuration names, and site-specific information to Cygnus
`configure'.
* Menu:
* Programs:: Adding configure to new programs
* Hosts and targets:: Adding hosts and targets
* Sites:: Adding site info
File: configure.info, Node: Programs, Next: Hosts and targets, Up: Porting
Adding `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 `configure' script that meets the GNU
standards (*note How Configuration Should Work:
(standards)Configuration., please do not add Cygnus `configure'. It
should be possible to add this program without change to a Cygnus
`configure' style source tree.
If the program is not target dependent, please consider using
`autoconf' instead of Cygnus `configure'. `autoconf' is available from
the Free Software Foundation; it is a program which generates an
executable shell script called `configure' by automatically finding
information on the system to be configured on and embedding this
information in the shell script. `configure' scripts generated by
`autoconf' require no arguments, and accept the same options as Cygnus
`configure'. For detailed instructions on using `autoconf', see *Note
How to organize and produce Autoconf scripts: (autoconf)Making
configure Scripts.
To add Cygnus `configure' to an existing program, do the following:
*Make sure the `Makefile' conforms to the GNU standard
The coding standard for writing a GNU `Makefile' is described in
*Note Makefile Conventions: (stan