Just-In-Time compiler for the OCaml byte-code runtime.
OCaml C Assembly Emacs Lisp Shell Objective-C Other
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toplevel PR#5238, PR#5277: Sys_error when getting error location Aug 4, 2011
utils Objective Caml release 3.12.0 Oct 19, 2010
win32caml Objective Caml release 3.12.0 Oct 19, 2010
yacc Objective Caml release 3.12.0 Oct 19, 2010
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LICENSE Update to OCaml 3.12.1. Aug 17, 2011
Makefile.nt Objective Caml release 3.12.0 Oct 19, 2010
README updated list of first-tier ports Apr 29, 2011
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Objective Caml is an implementation of the ML language, based on
the Caml Light dialect extended with a complete class-based object system
and a powerful module system in the style of Standard ML.

Objective Caml comprises two compilers. One generates bytecode
which is then interpreted by a C program. This compiler runs quickly,
generates compact code with moderate memory requirements, and is
portable to essentially any 32 or 64 bit Unix platform. Performance of
generated programs is quite good for a bytecoded implementation.
This compiler can be used either as a standalone, batch-oriented
compiler that produces standalone programs, or as an interactive,
toplevel-based system.

The other compiler generates high-performance native code for a number
of processors. Compilation takes longer and generates bigger code, but
the generated programs deliver excellent performance, while retaining
the moderate memory requirements of the bytecode compiler. The
native-code compiler currently runs on the following platforms:

Tier 1 (actively used and maintained by the core Caml team):

    AMD64 (Opteron)    Linux, MacOS X, MS Windows
    IA32 (Pentium)     Linux, FreeBSD, MacOS X, MS Windows
    PowerPC            MacOS X

Tier 2 (maintained when possible, with help from users):

    Alpha              Digital Unix/Compaq Tru64, Linux, all BSD
    AMD64              FreeBSD, OpenBSD
    HP PA-RISC         HPUX 11, Linux
    IA32 (Pentium)     NetBSD, OpenBSD, Solaris 9
    IA64               Linux, FreeBSD
    MIPS               IRIX 6
    PowerPC            Linux, NetBSD
    SPARC              Solaris 9, Linux, NetBSD
    Strong ARM         Linux

Other operating systems for the processors above have not been tested,
but the compiler may work under other operating systems with little work.

Before the introduction of objects, Objective Caml was known as Caml
Special Light. Objective Caml is almost upwards compatible with Caml
Special Light, except for a few additional reserved keywords that have
forced some renaming of standard library functions.


  Changes               what's new with each release
  INSTALL               instructions for installation
  LICENSE               license and copyright notice
  Makefile              main Makefile
  README                this file
  README.win32          infos on the MS Windows ports of O.Caml
  asmcomp/              native-code compiler and linker
  asmrun/               native-code runtime library
  boot/                 bootstrap compiler
  bytecomp/             bytecode compiler and linker
  byterun/              bytecode interpreter and runtime system
  camlp4/               the Camlp4 preprocessor
  config/               autoconfiguration stuff
  debugger/             source-level replay debugger
  driver/               driver code for the compilers
  emacs/                Caml editing mode and debugger interface for GNU Emacs
  lex/                  lexer generator
  maccaml/              the Macintosh GUI
  ocamldoc/             documentation generator
  otherlibs/            several external libraries
  parsing/              syntax analysis
  stdlib/               standard library
  tools/                various utilities
  toplevel/             interactive system
  typing/               typechecking
  utils/                utility libraries
  yacc/                 parser generator


All files marked "Copyright INRIA" in this distribution are copyright
1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008 Institut National de Recherche en Informatique et en Automatique
(INRIA) and distributed under the conditions stated in file LICENSE.


See the file INSTALL for installation instructions on Unix, Linux and
MacOS X machines.  For MS Windows, see README.win32.


The Objective Caml manual is distributed in HTML, PDF, Postscript,
DVI, and Emacs Info files.  It is available on the World Wide Web, at



The complete Objective Caml distribution can be accessed at



There exists a mailing list of users of the Caml implementations
developed at INRIA. The purpose of this list is to share
experience, exchange ideas (and even code), and report on applications
of the Caml language. Messages can be written in English or in
French. The list has about 750 subscribers.

Messages to the list should be sent to:


You can subscribe to this list via the Web interface at


Archives of the list are available on the Web site http://caml.inria.fr/

The Usenet news groups comp.lang.ml and comp.lang.functional
also contains discussions about the ML family of programming languages,
including Caml.


Please report bugs using the Web interface to the bug-tracking system
at http://caml.inria.fr/bin/caml-bugs

To be effective, bug reports should include a complete program
(preferably small) that exhibits the unexpected behavior, and the
configuration you are using (machine type, etc).

You can also contact the implementors directly at caml@inria.fr.