Clozure CL (CCL) is a Common Lisp implementation. It implements the full ANSI Common Lisp standard with several extensions ( CLOS MOP, threads, CLOS conditions, CLOS streams, ...). It contains a command line development environment, an experimental integrated development environment (IDE) for Mac OS X using the Hemlock editor, and can also be used with

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(a Common Lisp development environment for

GNU Emacs GNU Emacs is a free software text editor. It was created by GNU Project founder Richard Stallman, based on the Emacs editor developed for Unix operating systems. GNU Emacs has been a central component of the GNU project and a flagship project of ...

). Clozure CL is open source and the project is hosted by Clozure Associates.

Supported platforms

Clozure CL supports the

Mac OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and la ...

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, w ...

, FreeBSD,

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and Microsoft Windows platforms. There are 32 and 64 bit

x86 x86 (also known as 80x86 or the 8086 family) is a family of complex instruction set computer (CISC) instruction set architectures initially developed by Intel based on the Intel 8086 microprocessor and its 8088 variant. The 8086 was intr ...

variants for each. Additionally, there are PowerPC ports for Mac OS X and Linux, and a 32-bit

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port for Linux.

Applications

Clozure CL was used by

ITA Software ITA Software is a travel industry software division of Google, formerly an independent company, in Cambridge, Massachusetts. The company was founded by Jeremy Wertheimer, a computer scientist from the MIT Artificial Intelligence Laboratory and Co ...

for the business logic of a new Airline Reservation System. Clozure CL is also commonly used as an underlying Common Lisp implementation for the ACL2 theorem prover.

History

Formerly known as OpenMCL, Clozure CL is an evolution of

Macintosh Common Lisp Macintosh Common Lisp (MCL) is an implementation and IDE for the Common Lisp programming language. Various versions of MCL run under the classic Mac OS (m68k and PPC) and Mac OS X. Versions of MCL up to and including 5.1 are proprietary. Vers ...

Technology

CCL contains a precise, generational, compacting garbage collector. CCL's compiler produces native instructions for Lisp expressions and files. By default every expression entered at the REPL is compiled to native code. Lisp threads are implemented as preemptively-scheduled, native operating-system threads. CCL implements built-in facilities to easily interface with C and Objective-C libraries (Cocoa bridge) and these are used to implement the IDE amongst other things. The IDE (based upon the Hemlock editor) is currently labelled as experimental. An effortCommunity pledge drive
for IDE improvements is underway to improve this.

References

External links

Clozure CL
*

Github Repository and Issue Tracker

Trac for Clozure CL

OpenMCL-Devel mailing list

Clozure CL in Apple's Mac App Store
Common Lisp implementations Common Lisp (programming language) software Cross-platform free software Cross-platform software Free compilers and interpreters Software using the Apache license Software using the LGPL license {{compu-prog-stub