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1 24 jeremybenn
Basic Installation
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==================
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These are installation instructions for Readline-5.1.
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The simplest way to compile readline is:
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  1. `cd' to the directory containing the readline source code and type
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     `./configure' to configure readline for your system.  If you're
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     using `csh' on an old version of System V, you might need to type
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     `sh ./configure' instead to prevent `csh' from trying to execute
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     `configure' itself.
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     Running `configure' takes some time.  While running, it prints some
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     messages telling which features it is checking for.
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  2. Type `make' to compile readline and build the static readline
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     and history libraries.  If supported, the shared readline and history
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     libraries will be built also.  See below for instructions on compiling
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     the other parts of the distribution.  Typing `make everything' will
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     cause the static and shared libraries (if supported) and the example
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     programs to be built.
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  3. Type `make install' to install the static readline and history
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     libraries, the readline include files, the documentation, and, if
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     supported, the shared readline and history libraries.
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  4. You can remove the created libraries and object files from the
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     build directory by typing `make clean'.  To also remove the
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     files that `configure' created (so you can compile readline for
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     a different kind of computer), type `make distclean'.  There is
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     also a `make maintainer-clean' target, but that is intended mainly
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     for the readline developers, and should be used with care.
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The `configure' shell script attempts to guess correct values for
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various system-dependent variables used during compilation.  It
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uses those values to create a `Makefile' in the build directory,
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and Makefiles in the `doc', `shlib', and `examples'
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subdirectories.  It also creates a `config.h' file containing
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system-dependent definitions.  Finally, it creates a shell script
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`config.status' that you can run in the future to recreate the
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current configuration, a file `config.cache' that saves the
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results of its tests to speed up reconfiguring, and a file
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`config.log' containing compiler output (useful mainly for
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debugging `configure').
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If you need to do unusual things to compile readline, please try
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to figure out how `configure' could check whether to do them, and
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mail diffs or instructions to  so they can
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be considered for the next release.  If at some point
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`config.cache' contains results you don't want to keep, you may
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remove or edit it.
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The file `configure.in' is used to create `configure' by a
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program called `autoconf'.  You only need `configure.in' if you
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want to change it or regenerate `configure' using a newer version
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of `autoconf'.  The readline `configure.in' requires autoconf
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version 2.50 or newer.
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Compilers and Options
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=====================
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Some systems require unusual options for compilation or linking that
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the `configure' script does not know about.  You can give `configure'
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initial values for variables by setting them in the environment.  Using
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a Bourne-compatible shell, you can do that on the command line like
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this:
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     CC=c89 CFLAGS=-O2 LIBS=-lposix ./configure
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Or on systems that have the `env' program, you can do it like this:
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     env CPPFLAGS=-I/usr/local/include LDFLAGS=-s ./configure
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Compiling For Multiple Architectures
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====================================
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You can compile readline for more than one kind of computer at the
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same time, by placing the object files for each architecture in their
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own directory.  To do this, you must use a version of `make' that
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supports the `VPATH' variable, such as GNU `make'.  `cd' to the
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directory where you want the object files and executables to go and run
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the `configure' script.  `configure' automatically checks for the
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source code in the directory that `configure' is in and in `..'.
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If you have to use a `make' that does not supports the `VPATH'
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variable, you have to compile readline for one architecture at a
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time in the source code directory.  After you have installed
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readline for one architecture, use `make distclean' before
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reconfiguring for another architecture.
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Installation Names
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==================
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By default, `make install' will install the readline libraries in
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`/usr/local/lib', the include files in
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`/usr/local/include/readline', the man pages in `/usr/local/man',
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and the info files in `/usr/local/info'.  You can specify an
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installation prefix other than `/usr/local' by giving `configure'
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the option `--prefix=PATH' or by supplying a value for the
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DESTDIR variable when running `make install'.
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You can specify separate installation prefixes for
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architecture-specific files and architecture-independent files.
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If you give `configure' the option `--exec-prefix=PATH', the
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readline Makefiles will use PATH as the prefix for installing the
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libraries.  Documentation and other data files will still use the
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regular prefix.
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Specifying the System Type
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==========================
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There may be some features `configure' can not figure out
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automatically, but need to determine by the type of host readline
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will run on.  Usually `configure' can figure that out, but if it
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prints a message saying it can not guess the host type, give it
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the `--host=TYPE' option.  TYPE can either be a short name for
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the system type, such as `sun4', or a canonical name with three
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fields: CPU-COMPANY-SYSTEM (e.g., i386-unknown-freebsd4.2).
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See the file `config.sub' for the possible values of each field.
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Sharing Defaults
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================
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If you want to set default values for `configure' scripts to share,
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you can create a site shell script called `config.site' that gives
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default values for variables like `CC', `cache_file', and `prefix'.
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`configure' looks for `PREFIX/share/config.site' if it exists, then
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`PREFIX/etc/config.site' if it exists.  Or, you can set the
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`CONFIG_SITE' environment variable to the location of the site script.
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A warning: the readline `configure' looks for a site script, but not
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all `configure' scripts do.
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Operation Controls
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==================
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`configure' recognizes the following options to control how it
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operates.
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`--cache-file=FILE'
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     Use and save the results of the tests in FILE instead of
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     `./config.cache'.  Set FILE to `/dev/null' to disable caching, for
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     debugging `configure'.
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`--help'
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     Print a summary of the options to `configure', and exit.
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`--quiet'
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`--silent'
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`-q'
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     Do not print messages saying which checks are being made.
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`--srcdir=DIR'
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     Look for the package's source code in directory DIR.  Usually
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     `configure' can determine that directory automatically.
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`--version'
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     Print the version of Autoconf used to generate the `configure'
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     script, and exit.
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`configure' also accepts some other, not widely useful, options.
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Optional Features
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=================
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The readline `configure' recognizes a single `--with-PACKAGE' option:
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`--with-curses'
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    This tells readline that it can find the termcap library functions
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    (tgetent, et al.) in the curses library, rather than a separate
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    termcap library.  Readline uses the termcap functions, but does not
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    link with the termcap or curses library itself, allowing applications
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    which link with readline the to choose an appropriate library.
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    This option tells readline to link the example programs with the
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    curses library rather than libtermcap.
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`configure' also recognizes two `--enable-FEATURE' options:
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`--enable-shared'
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    Build the shared libraries by default on supported platforms.  The
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    default is `yes'.
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`--enable-static'
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    Build the static libraries by default.  The default is `yes'.
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Shared Libraries
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================
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There is support for building shared versions of the readline and
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history libraries.  The configure script creates a Makefile in
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the `shlib' subdirectory, and typing `make shared' will cause
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shared versions of the readline and history libraries to be built
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on supported platforms.
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If `configure' is given the `--enable-shared' option, it will attempt
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to build the shared libraries by default on supported platforms.
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Configure calls the script support/shobj-conf to test whether or
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not shared library creation is supported and to generate the values
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of variables that are substituted into shlib/Makefile.  If you
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try to build shared libraries on an unsupported platform, `make'
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will display a message asking you to update support/shobj-conf for
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your platform.
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If you need to update support/shobj-conf, you will need to create
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a `stanza' for your operating system and compiler.  The script uses
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the value of host_os and ${CC} as determined by configure.  For
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instance, FreeBSD 4.2 with any version of gcc is identified as
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`freebsd4.2-gcc*'.
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In the stanza for your operating system-compiler pair, you will need to
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define several variables.  They are:
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SHOBJ_CC        The C compiler used to compile source files into shareable
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                object files.  This is normally set to the value of ${CC}
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                by configure, and should not need to be changed.
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SHOBJ_CFLAGS    Flags to pass to the C compiler ($SHOBJ_CC) to create
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                position-independent code.  If you are using gcc, this
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                should probably be set to `-fpic'.
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SHOBJ_LD        The link editor to be used to create the shared library from
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                the object files created by $SHOBJ_CC.  If you are using
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                gcc, a value of `gcc' will probably work.
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SHOBJ_LDFLAGS   Flags to pass to SHOBJ_LD to enable shared object creation.
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                If you are using gcc, `-shared' may be all that is necessary.
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                These should be the flags needed for generic shared object
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                creation.
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SHLIB_XLDFLAGS  Additional flags to pass to SHOBJ_LD for shared library
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                creation.  Many systems use the -R option to the link
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                editor to embed a path within the library for run-time
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                library searches.  A reasonable value for such systems would
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                be `-R$(libdir)'.
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SHLIB_LIBS      Any additional libraries that shared libraries should be
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                linked against when they are created.
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SHLIB_LIBPREF   The prefix to use when generating the filename of the shared
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                library.  The default is `lib'; Cygwin uses `cyg'.
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SHLIB_LIBSUFF   The suffix to add to `libreadline' and `libhistory' when
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                generating the filename of the shared library.  Many systems
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                use `so'; HP-UX uses `sl'.
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SHLIB_LIBVERSION The string to append to the filename to indicate the version
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                of the shared library.  It should begin with $(SHLIB_LIBSUFF),
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                and possibly include version information that allows the
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                run-time loader to load the version of the shared library
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                appropriate for a particular program.  Systems using shared
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                libraries similar to SunOS 4.x use major and minor library
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                version numbers; for those systems a value of
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                `$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)' is appropriate.
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                Systems based on System V Release 4 don't use minor version
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                numbers; use `$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)' on those systems.
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                Other Unix versions use different schemes.
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SHLIB_DLLVERSION The version number for shared libraries that determines API
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                compatibility between readline versions and the underlying
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                system.  Used only on Cygwin.  Defaults to $SHLIB_MAJOR, but
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                can be overridden at configuration time by defining DLLVERSION
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                in the environment.
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SHLIB_DOT       The character used to separate the name of the shared library
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                from the suffix and version information.  The default is `.';
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                systems like Cygwin which don't separate version information
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                from the library name should set this to the empty string.
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SHLIB_STATUS    Set this to `supported' when you have defined the other
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                necessary variables.  Make uses this to determine whether
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                or not shared library creation should be attempted.  If
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                shared libraries are not supported, this will be set to
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                `unsupported'.
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You should look at the existing stanzas in support/shobj-conf for ideas.
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Once you have updated support/shobj-conf, re-run configure and type
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`make shared' or `make'.  The shared libraries will be created in the
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shlib subdirectory.
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If shared libraries are created, `make install' will install them.
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You may install only the shared libraries by running `make
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install-shared' from the top-level build directory.  Running `make
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install' in the shlib subdirectory will also work.  If you don't want
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to install any created shared libraries, run `make install-static'.

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