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Basic Installation

==================

These are installation instructions for Readline-5.1.

The simplest way to compile readline is:

  1. `cd' to the directory containing the readline source code and type

     `./configure' to configure readline for your system.  If you're

     using `csh' on an old version of System V, you might need to type

     `sh ./configure' instead to prevent `csh' from trying to execute

     `configure' itself.

     Running `configure' takes some time.  While running, it prints some

     messages telling which features it is checking for.

  2. Type `make' to compile readline and build the static readline

     and history libraries.  If supported, the shared readline and history

     libraries will be built also.  See below for instructions on compiling

     the other parts of the distribution.  Typing `make everything' will

     cause the static and shared libraries (if supported) and the example

     programs to be built.

  3. Type `make install' to install the static readline and history

     libraries, the readline include files, the documentation, and, if

     supported, the shared readline and history libraries.

  4. You can remove the created libraries and object files from the

     build directory by typing `make clean'.  To also remove the

     files that `configure' created (so you can compile readline for

     a different kind of computer), type `make distclean'.  There is

     also a `make maintainer-clean' target, but that is intended mainly

     for the readline developers, and should be used with care.

The `configure' shell script attempts to guess correct values for

various system-dependent variables used during compilation.  It

uses those values to create a `Makefile' in the build directory,

and Makefiles in the `doc', `shlib', and `examples'

subdirectories.  It also creates a `config.h' file containing

system-dependent definitions.  Finally, it creates a shell script

`config.status' that you can run in the future to recreate the

current configuration, a file `config.cache' that saves the

results of its tests to speed up reconfiguring, and a file

`config.log' containing compiler output (useful mainly for

debugging `configure').

If you need to do unusual things to compile readline, please try

to figure out how `configure' could check whether to do them, and

mail diffs or instructions to  so they can

be considered for the next release.  If at some point

`config.cache' contains results you don't want to keep, you may

remove or edit it.

The file `configure.in' is used to create `configure' by a

program called `autoconf'.  You only need `configure.in' if you

want to change it or regenerate `configure' using a newer version

of `autoconf'.  The readline `configure.in' requires autoconf

version 2.50 or newer.

Compilers and Options

=====================

Some systems require unusual options for compilation or linking that

the `configure' script does not know about.  You can give `configure'

initial values for variables by setting them in the environment.  Using

a Bourne-compatible shell, you can do that on the command line like

this:

     CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure

Or on systems that have the `env' program, you can do it like this:

     env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure

Compiling For Multiple Architectures

====================================

You can compile readline for more than one kind of computer at the

same time, by placing the object files for each architecture in their

own directory.  To do this, you must use a version of `make' that

supports the `VPATH' variable, such as GNU `make'.  `cd' to the

directory where you want the object files and executables to go and run

the `configure' script.  `configure' automatically checks for the

source code in the directory that `configure' is in and in `..'.

If you have to use a `make' that does not supports the `VPATH'

variable, you have to compile readline for one architecture at a

time in the source code directory.  After you have installed

readline for one architecture, use `make distclean' before

reconfiguring for another architecture.

Installation Names

==================

By default, `make install' will install the readline libraries in

`/usr/local/lib', the include files in

`/usr/local/include/readline', the man pages in `/usr/local/man',

and the info files in `/usr/local/info'.  You can specify an

installation prefix other than `/usr/local' by giving `configure'

the option `--prefix=PATH' or by supplying a value for the

DESTDIR variable when running `make install'.

You can specify separate installation prefixes for

architecture-specific files and architecture-independent files.

If you give `configure' the option `--exec-prefix=PATH', the

readline Makefiles will use PATH as the prefix for installing the

libraries.  Documentation and other data files will still use the

regular prefix.

Specifying the System Type

==========================

There may be some features `configure' can not figure out

automatically, but need to determine by the type of host readline

will run on.  Usually `configure' can figure that out, but if it

prints a message saying it can not guess the host type, give it

the `--host=TYPE' option.  TYPE can either be a short name for

the system type, such as `sun4', or a canonical name with three

fields: CPU-COMPANY-SYSTEM (e.g., i386-unknown-freebsd4.2).

See the file `config.sub' for the possible values of each field.

Sharing Defaults

================

If you want to set default values for `configure' scripts to share,

you can create a site shell script called `config.site' that gives

default values for variables like `CC', `cache_file', and `prefix'.

`configure' looks for `PREFIX/share/config.site' if it exists, then

`PREFIX/etc/config.site' if it exists.  Or, you can set the

`CONFIG_SITE' environment variable to the location of the site script.

A warning: the readline `configure' looks for a site script, but not

all `configure' scripts do.

Operation Controls

==================

`configure' recognizes the following options to control how it

operates.

`--cache-file=FILE'

     Use and save the results of the tests in FILE instead of

     `./config.cache'.  Set FILE to `/dev/null' to disable caching, for

     debugging `configure'.

`--help'

     Print a summary of the options to `configure', and exit.

`--quiet'

`--silent'

`-q'

     Do not print messages saying which checks are being made.

`--srcdir=DIR'

     Look for the package's source code in directory DIR.  Usually

     `configure' can determine that directory automatically.

`--version'

     Print the version of Autoconf used to generate the `configure'

     script, and exit.

`configure' also accepts some other, not widely useful, options.

Optional Features

=================

The readline `configure' recognizes a single `--with-PACKAGE' option:

`--with-curses'

    This tells readline that it can find the termcap library functions

    (tgetent, et al.) in the curses library, rather than a separate

    termcap library.  Readline uses the termcap functions, but does not

    link with the termcap or curses library itself, allowing applications

    which link with readline the to choose an appropriate library.

    This option tells readline to link the example programs with the

    curses library rather than libtermcap.

`configure' also recognizes two `--enable-FEATURE' options:

`--enable-shared'

    Build the shared libraries by default on supported platforms.  The

    default is `yes'.

`--enable-static'

    Build the static libraries by default.  The default is `yes'.

Shared Libraries

================

There is support for building shared versions of the readline and

history libraries.  The configure script creates a Makefile in

the `shlib' subdirectory, and typing `make shared' will cause

shared versions of the readline and history libraries to be built

on supported platforms.

If `configure' is given the `--enable-shared' option, it will attempt

to build the shared libraries by default on supported platforms.

Configure calls the script support/shobj-conf to test whether or

not shared library creation is supported and to generate the values

of variables that are substituted into shlib/Makefile.  If you

try to build shared libraries on an unsupported platform, `make'

will display a message asking you to update support/shobj-conf for

your platform.

If you need to update support/shobj-conf, you will need to create

a `stanza' for your operating system and compiler.  The script uses

the value of host_os and ${CC} as determined by configure.  For

instance, FreeBSD 4.2 with any version of gcc is identified as

`freebsd4.2-gcc*'.

In the stanza for your operating system-compiler pair, you will need to

define several variables.  They are:

SHOBJ_CC        The C compiler used to compile source files into shareable

                object files.  This is normally set to the value of ${CC}

                by configure, and should not need to be changed.

SHOBJ_CFLAGS    Flags to pass to the C compiler ($SHOBJ_CC) to create

                position-independent code.  If you are using gcc, this

                should probably be set to `-fpic'.

SHOBJ_LD        The link editor to be used to create the shared library from

                the object files created by $SHOBJ_CC.  If you are using

                gcc, a value of `gcc' will probably work.

SHOBJ_LDFLAGS   Flags to pass to SHOBJ_LD to enable shared object creation.

                If you are using gcc, `-shared' may be all that is necessary.

                These should be the flags needed for generic shared object

                creation.

SHLIB_XLDFLAGS  Additional flags to pass to SHOBJ_LD for shared library

                creation.  Many systems use the -R option to the link

                editor to embed a path within the library for run-time

                library searches.  A reasonable value for such systems would

                be `-R$(libdir)'.

SHLIB_LIBS      Any additional libraries that shared libraries should be

                linked against when they are created.

SHLIB_LIBPREF   The prefix to use when generating the filename of the shared

                library.  The default is `lib'; Cygwin uses `cyg'.

SHLIB_LIBSUFF   The suffix to add to `libreadline' and `libhistory' when

                generating the filename of the shared library.  Many systems

                use `so'; HP-UX uses `sl'.

SHLIB_LIBVERSION The string to append to the filename to indicate the version

                of the shared library.  It should begin with $(SHLIB_LIBSUFF),

                and possibly include version information that allows the

                run-time loader to load the version of the shared library

                appropriate for a particular program.  Systems using shared

                libraries similar to SunOS 4.x use major and minor library

                version numbers; for those systems a value of

                `$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)' is appropriate.

                Systems based on System V Release 4 don't use minor version

                numbers; use `$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)' on those systems.

                Other Unix versions use different schemes.

SHLIB_DLLVERSION The version number for shared libraries that determines API

                compatibility between readline versions and the underlying

                system.  Used only on Cygwin.  Defaults to $SHLIB_MAJOR, but

                can be overridden at configuration time by defining DLLVERSION

                in the environment.

SHLIB_DOT       The character used to separate the name of the shared library

                from the suffix and version information.  The default is `.';

                systems like Cygwin which don't separate version information

                from the library name should set this to the empty string.

SHLIB_STATUS    Set this to `supported' when you have defined the other

                necessary variables.  Make uses this to determine whether

                or not shared library creation should be attempted.  If

                shared libraries are not supported, this will be set to

                `unsupported'.

You should look at the existing stanzas in support/shobj-conf for ideas.

Once you have updated support/shobj-conf, re-run configure and type

`make shared' or `make'.  The shared libraries will be created in the

shlib subdirectory.

If shared libraries are created, `make install' will install them.

You may install only the shared libraries by running `make

install-shared' from the top-level build directory.  Running `make

install' in the shlib subdirectory will also work.  If you don't want

to install any created shared libraries, run `make install-static'.