Caution
The developer team released OCaml 5.0.0 in December 2022. OCaml 5.x features a full rewrite of its runtime system for shared-memory parallel programming using domains and native support for concurrent programming using effect handlers.
Owing to the large number of changes, especially to the garbage collector, OCaml 4.14 (the final release in the OCaml 4.x series, originally released in March 2022) remains supported for the time being. Maintainers of existing codebases are strongly encouraged to evaluate OCaml 5.x and to report any performance degradations on our issue tracker.
OCaml is a functional, statically-typed programming language from the ML family, offering a powerful module system extending that of Standard ML and a feature-rich, class-based object system.
OCaml 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 many 32 or 64 bit platforms. 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 REPL 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 maintained) Tier 2 (maintained when possible)x86 64 bits
Linux, macOS, Windows, FreeBSD
NetBSD, OpenBSD, OmniOS (Solaris)
ARM 64 bits
Linux, macOS
FreeBSD, OpenBSD, NetBSD
Power 64 bits
Linux (little-endian, ABIv2)
Linux (big-endian, ABIv2)
RISC-V 64 bits
Linux
IBM Z (s390x)
Linux
Other operating systems for the processors above have not been tested, but the compiler may work under other operating systems with little work.
❗ From OCaml 5.0 onwards, native compilation is available only on 64-bit systems. Native compilation on 32-bit systems is no longer available, nor are there plans to bring it back.
All files marked "Copyright INRIA" in this distribution are Copyright © 1996-2023 Institut National de Recherche en Informatique et en Automatique (INRIA) and distributed under the conditions stated in file LICENSE.
See the file INSTALL.adoc for installation instructions on machines running Unix, Linux, macOS, WSL and Cygwin. For native Microsoft Windows, see README.win32.adoc.
Keeping in Touch with the Caml Community Bug Reports and User FeedbackPlease report bugs using the issue tracker at https://github.com/ocaml/ocaml/issues
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).
Separately maintained componentsSome libraries and tools which used to be part of the OCaml distribution are now maintained separately and distributed as OPAM packages. Please use the issue trackers at their respective new homes:
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