CMU Common Lisp

CMU Common Lisp

CMUCL is a free Common Lisp implementation, originally developed at Carnegie Mellon University. It compiles to native code as well as compact byte code; the compiler ("Python", not to be confused with the Python programming language) generates some of the fastest object code of any Common Lisp implementation. CMUCL runs on most Unix-like platforms, including Linux and BSD; there is an experimental Windows port as well. Steel Bank Common Lisp is derived from CMUCL.


  • A sophisticated native-code compiler which is capable of powerful type inferences, and generates code competitive in speed with C compilers.
  • Generational garbage collection and multiprocessing capability on the x86 ports.
  • A foreign function interface which allows interfacing with C code and system libraries, including shared libraries on most platforms, and direct access to Unix system calls.
  • Support for interprocess communication and remote procedure calls.
  • An implementation of CLOS, the Common Lisp Object System, which includes multimethods and a metaobject protocol.
  • A graphical source-level debugger using a Motif interface, and a code profiler.
  • An interface to the X11 Window System (CLX), and a sophisticated graphical widget library (Garnet).
  • Programmer-extensible input and output streams.
  • An Emacs-like editor implemented in Common Lisp.

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