install

用于词法分析的词法分析器

			  Elex Installation

			  Copyright (C) 1997
			  All Rights Reserved

		Matthew Phillips <[e-mail]>

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Requirements
============

 * Linux 1.x or 2.x.  Other POSIX'ish systems with a g++ port
   (Solaris, Irix, HP/UX, etc) will probably work too.

 * GNU make 3.0 or later.

 * GNU g++ 2.7.0 or later.

 * Perl 5.001 or later.


Installation Steps
==================

1. Build Elex.  Change to the directory where you unpacked Elex and
   type `make'.  Alternatively, type `make install' which combines
   this step with step 2 below.

2. Install Elex by typing `make install' (which should be run as root
   if you intend to make a system-wide installation).  The installer
   generates an Elex directory tree after asking the following
   questions:

  (a) The name of the installation directory where the Elex tree will
      be created.  The default is `/usr/local', which means Elex will
      be installed in `/usr/local/elex'.

  (b) Whether to install `elex.info' in the system info directory so
      it will be automatically visible to Info readers such as `emacs'
      and `info'.  If you say yes, then you are prompted for the
      location of the system info directory (the default will probably
      be correct).  The `elex.info' file is also installed in the
      `doc' directory.

3. Change to the `demo' subdirectory in the installation tree and run
   `make' to check that the installation is OK.

Enjoy!


Notes
=====

* Ignore warning messages that look like:

  ../util/DiscreteSet.h:31: warning: comparison is always 1 ...

  Unfortunately there seems to be no way to suppress this (harmless)
  warning.

* After installation, the directory where you unpacked Elex is no
  longer needed.

* By default, the Elex binaries are compiled with full (-O2)
  optimisation.  However -O2 causes some problems with g++ 2.7.x when
  templates are being used, so a few files are be compiled with no
  optimisation.  Luckily, those classes that really benefit from
  optimisation compile OK with it on.

* If you want Elex to be a little bit smaller and faster you can turn
  off some internal sanity checks by adding `-DNCHECK' to the list of
  options on the `CFLAGS = ...'  line in Defs.make before running
  make.

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$Revision: 1.2 $