		       G N A T   E X A M P L E S
                       =========================

This directory contains various examples that demonstrate how to use GNAT.
Each subdirectory contains a set of small examples illustrating a particular
point of our technology, as well as a short text file called README.testing
indicating how to compile and run the corresponding examples.

In any README file, the '$' sign denotes the system prompt.

Important notice: if you are on a multiuser machine and get the present example
directory from a shared gnat installation, you may not be able to compile
directly in this directory.
In this situation, you will need to copy this directory
to another directory where you have the write permission. For instance,
on many Unix sustems, you will do:

  $ cp -r <prefix>/examples <another directory>

You can compile and run all the examples by simply running:
  $ make

if you are on a	 Windows system and use the Cygwin environment, in order to
use  the Makefiles from the cygwin shell you need to type:

  $ make CYGWIN=true

if you are using a cross compiler you need to type:

  $ make TARGET=<target name>

where target is the prefix of your GNAT commands. For instance, if you are 
using a cross compiler for PowerPC with VxWorks you need to type:

  $ make TARGET=powerpc-wrs-vxworks

You can also compile and run the examples located in a given directory by
typing:
  $ make <directory>
in this directory, or by doing:
  $ cd <directory>
  $ make

You can also type
  $ make clean
anywhere to remove the files produced at compilation time.

You may want to have a look at Makefile.inc which defines all of the variables
allowing some configurability in the runs. For instance, if you do not want to
run the diners example because it takes a long time, you can use the RUN_DINERS
variable:
   make RUN_DINERS=false
or if you have g++ installed and like to run the c++ interfacing example:
   make CPLUSPLUS=true

Here's a list of the various subdirectories:

starter:

    This directory contains your very first Ada program, the traditional
    "Hello world" program. You will learn how to invoke GNAT, and how to
    find a basic error.

options:

    This directory shows some useful GNAT options, such as optimization
    level, syntax checking, binder control ...

simple_project:

    This directory is an introduction to the GNAT project feature, which
    allows you to specify in a separate file many compilation options.

full_project:

    This directory is a follow-up to the previous one. It demonstrates
    how to use some advanced features of the project files, such as the
    external variables.

other_languages:

    This directory demonstrates how to call subprograms written in languages
    different from Ada, in particular C and C++. You will need to have
    a working C++ compiler in order to run these examples.

	     Thank you for using GNAT, and happy training !
