Tcl UNIX README
---------------

This is the directory where you configure, compile, test, and install
UNIX versions of Tcl.  This directory also contains source files for Tcl
that are specific to UNIX.  Some of the files in this directory are
used on the PC or Mac platform too, but they all depend on UNIX
(POSIX/ANSI C) interfaces and some of them only make sense under UNIX.

Updated forms of the information found in this file is available at:
	http://dev.scriptics.com/doc/howto/compile.html#unix

For information on platforms where Tcl is known to compile, along
with any porting notes for getting it to work on those platforms, see:
	http://dev.scriptics.com/software/tcltk/platforms.html

The rest of this file contains instructions on how to do this.  The
release should compile and run either "out of the box" or with trivial
changes on any UNIX-like system that approximates POSIX, BSD, or System
V.  We know that it runs on workstations from Sun, H-P, DEC, IBM, and
SGI, as well as PCs running Linux, BSDI, and SCO UNIX.  To compile for
a PC running Windows, see the README file in the directory ../win.  To
compile for a Macintosh, see the README file in the directory ../mac.

RCS: @(#) $Id: README,v 1.15 2001/04/02 01:59:55 hobbs Exp $

How To Compile And Install Tcl:
-------------------------------

(a) Check for patches as described in ../README.

(b) If you have already compiled Tcl once in this directory and are now
    preparing to compile again in the same directory but for a different
    platform, or if you have applied patches, type "make distclean" to
    discard all the configuration information computed previously.

(c) If there is no "configure" script in this directory it is because you
    are working out of the source repository (i.e., CVS) instead of working
    from a source distribution.  In this case you need to use "autoconf"
    to generate the configure script.  It runs with no arguments.
    Remember to run it here and down in the dltest directory.

    (in the tcl/unix directory)
    autoconf
    cd dltest ; autoconf ; cd ..

(d) Type "./configure".  This runs a configuration script created by GNU
    autoconf, which configures Tcl for your system and creates a
    Makefile.  The configure script allows you to customize the Tcl
    configuration for your site; for details on how you can do this,
    type "./configure -help" or refer to the autoconf documentation (not
    included here).  Tcl's "configure" supports the following special
    switches in addition to the standard ones:
	--enable-threads	If this switch is set, Tcl will compile
				itself with multithreading support.
	--disable-load		If this switch is specified then Tcl will
				configure itself not to allow dynamic loading,
				even if your system appears to support it.
				Normally you can leave this switch out and
				Tcl will build itself for dynamic loading
				if your system supports it.
	--enable-shared		If this switch is specified, Tcl will compile
				itself as a shared library if it can figure
				out how to do that on this platform.  This
				is the default on platforms where we know
				how to build shared libraries.
	--disable-shared	If this switch is specified, Tcl will compile
				itself as a static library.

    Note: by default gcc will be used if it can be located on the PATH.
    if you want to use cc instead of gcc, set the CC environment variable
    to "cc" before running configure. It is not safe to edit the
    Makefile to use gcc after configure is run.

    Note: be sure to use only absolute path names (those starting with "/")
    in the --prefix and --exec_prefix options.

(e) Type "make".  This will create a library archive called
    "libtcl<version>.a" or "libtcl<version>.so" and an interpreter
    application called "tclsh" that allows you to type Tcl commands
    interactively or execute script files.

(f) If the make fails then you'll have to personalize the Makefile
    for your site or possibly modify the distribution in other ways.
    First check the porting Web page above to see if there are hints
    for compiling on your system.  If you need to modify Makefile,
    are comments at the beginning of it that describe the things you
    might want to change and how to change them.

(g) Type "make install" to install Tcl binaries and script files in
    standard places.  You'll need write permission on the installation
    directories to do this.  The installation directories are
    determined by the "configure" script and may be specified with
    the --prefix and --exec_prefix options to "configure".  See the
    Makefile for information on what directories were chosen; you
    can override these choices by modifying the "prefix" and
    "exec_prefix" variables in the Makefile.

(h) At this point you can play with Tcl by invoking the "tclsh"
    program and typing Tcl commands.  However, if you haven't installed
    Tcl then you'll first need to set your TCL_LIBRARY variable to
    hold the full path name of the "library" subdirectory.  Note that
    the installed versions of tclsh, libtcl.a, and libtcl.so have a
    version number in their names, such as "tclsh8.4" or "libtcl8.4.so";
    to use the installed versions, either specify the version number
    or create a symbolic link (e.g. from "tclsh" to "tclsh8.4").

If you have trouble compiling Tcl, see the URL noted above about working
platforms.  It contains information that people have provided about changes
they had to make to compile Tcl in various environments.  We're also
interested in hearing how to change the configuration setup so that Tcl
compiles on additional platforms "out of the box".

Test suite
----------

There is a relatively complete test suite for all of the Tcl core in
the subdirectory "tests".  To use it just type "make test" in this
directory.  You should then see a printout of the test files processed.
If any errors occur, you'll see a much more substantial printout for
each error.  See the README file in the "tests" directory for more
information on the test suite.  Note: don't run the tests as superuser:
this will cause several of them to fail.  If a test is failing
consistently, please send us a bug report with as much detail as you
can manage.  Please use the online database at
	http://tcl.sourceforge.net/

The Tcl test suite is very sensitive to proper implementation of
ANSI C library procedures such as sprintf and sscanf.  If the test
suite generates errors, most likely they are due to non-conformance
of your system's ANSI C library;  such problems are unlikely to
affect any real applications so it's probably safe to ignore them.
