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README

Introduction
------------

GNU Cim is a compiler for the programming language Simula (except
unspecified parameters to formal or virtual procedures (see the
documentation for how portable code for formal procedures can be
written)).  It offers a class concept, separate compilation with full
type checking, interface to external C routines, an application
package for process simulation and a coroutine concept.

The portability of the GNU Simula Compiler is based on the C
programming language.  The compiler and the run-time system is written
in C, and the compiler produces C code, that is passed to a C compiler
for further processing towards machine code.

Copyright
---------

GNU Cim is copyrighted by Sverre Hvammen Johansen, Stein Krogdahl, and
Terje Mj�s, Department of Informatics, University of Oslo (plus some
minor parts from Free Software Fundation).

GNU Cim is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; version 2.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

Compilation
-----------

The following instructions assumes that you are using a
Bourne-compatible shell. Further details can be found in the enclosed
INSTALL file.

The simplest way to compile this package is:

  1. `cd' to the directory containing the package's source code and 
     type `./configure' (or `CFLAGS=-O2 LDFLAGS=-s ./configure', 
     which is recomended when using GCC) to configure the package
     for your system.

     Running `configure' takes awhile.  While running, it prints some
     messages telling which features it is checking for.

  2. Type `make' to compile the package

  3. Type `make install' to install the package

You may want to compile the run-time-system with CFLAGS=-O2, but
have the cim compiler compile produced C-code with CFLAGS=-O0. 
This can most easilly be done by the following steps:

  1. `cd' to the directory containing the package's source code and 
     type `CFLAGS=-O2 ./configure'

  2. Type `make' to compile the package.

  3. Type `make install' to install the package.

  4. type `CFLAGS=-O0 ./configure'

  5. type `cd src; make' followed by `make install'
     
GCC may run out of virtual memory, and therefore you may want to use a
standard C-compiler instead. You can do that by typing `CC=cc
./configure'

Static vs. shared libraries
---------------------------

Cim builds by default both static and shared libraries.  You may need
to set some environment variables (LD_LIBRARY_PATH under Linux) or
edit some system configuration file (/etc/ld.so.conf under Linux) to
get access to the shared libraries at run-time. See the message that
is produced at the end of `make install' for some details.  If you
don't want shared libraries, then please run `./configure' with option
--disable-shared. Static libraries can be disabled with the option
--disable-static.

Bugs
----

Please mail bug reports for Cim to bug-cim@gnu.org. Please include
the Cim version number and the system type, which you can get by
running "cim --version", a copy of config.cache, and relevant Simula-
and produced C-code.

Version 4
---------

GNU Cim version 4 is experimental.  If you want a stable compiler, please
use version 3 instead.  We are planing support for more optimizations.

Version 3
---------

GNU Cim version 3 is no longer experimental.  The compiler may use a lot
of virtual memory. If that is a problem for you, please split your
program into separate compiled modules or use version 2 of cim
instead.

Sverre Hvammen Johansen





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