http://people.csail.mit.edu/jaffer/SCM
	The SCM Implementation of Scheme
	Current Version Released Terms 5f1 2013-05-10 LGPL

SCM includes Hobbit, the Scheme-to-C compiler originally written by Tanel Tammet. Hobbit generates C files whose binaries can be dynamically or statically linked with a SCM executable. SCM includes linkable modules for sequence-comparison, arrays, records, and byte-number conversions; and modules for POSIX system calls and network-sockets, readline, ncurses, and Xlib.

On some platforms SCM supports unexec (developed for Emacs and bash), which dumps a executable image from a running SCM. This results in very low latency (12.ms) startup for SCM.

SCM requires the SLIB Scheme Library. Both SCM and SLIB are GNU packages.

News

• Supports GNU configure.
• Makefile: Reorganized per http://www.gnu.org/prep/standards/.
• ioext.c (copy-file): Added.
  (init_ioext): Added directory*-for-each.
• sys.c (free_storage): Removed late call to lfflush() which caused segfault in fc9.
• Fixed db.so build.
• build.scm (wb): Added c-lib pthread.
  (C-libraries): pthread added.
• hobbit.texi (Compiling And Linking): Fixed quoting in example compile commands for MS shells.
• scm.texi (Numeric): Added infinite?, finite?, exact-round, exact-floor, exact-ceiling, and exact-truncate.
  (Bit Vectors): Fixed doc for bit-set*!.

• Macexp.scm (macro:expand-syntax): Fix non-pretty case. Fully expand identifier macros.
• eval.c (scm_macroexpand1): Properly handle identifier macros.
  (macroexp1): Fixed for the case of the first argument an identifier -- used to return a list headed by #@quote.
  (ceval_1): Fixed argument number check for nullary procedures -- used to incorrectly call scm_dynthrow.

Quick Start

x86 MS-Windows

Obtain slib-3b4-1.exe (1.1.MB) and run.
Obtain scm-5f1-1.exe (475.kB) and run.
Release Notes:

• The Windows installers were packaged by the NSIS (Nullsoft Scriptable Install System).
• The SCM executable for MS-Windows was compiled by MinGw version 5.1.6
• SCM.EXE supports WB B-Tree Databases with SCM.

i686 GNU/Linux with RPM

Obtain slib-3b4-1.noarch.rpm (760.kB) and scm-5f1-1.i686.rpm (960.kB) and install.

x86_64 GNU/Linux with RPM

Obtain slib-3b4-1.noarch.rpm (760.kB) and scm-5f1-1.x86_64.rpm (1.2.MB) and install.

Build From Source

• Obtain the last release: slib-3b4.zip (1.1.MB) and scm-5f1.zip (920.kB)
  or the current development snapshot: slib.zip (1.1.MB) and scm.zip (930.kB).
• Follow the instructions in Installing SCM, chapter 2 of the SCM manual.

Documentation

• Online SCM Manual; or scm.pdf
• Online Xlibscm Manual; or Xlibscm.pdf
• Online Hobbit Compiler Manual; or hobbit.pdf
• Online SLIB Manual; or slib.pdf
• Online Revised⁵ Report on the Algorithmic Language Scheme; or r5rs.pdf
• HTML labyrinth of the build relational database generated by the command:
  scm -r'db->html' -rbuild -e'(db->html-directory build "build")'

SCM Development

• Savannah: CVS Repository scm/scm
• Development Snapshot scm.zip (830.kB)
• SCM discussion mailing list

Related Sites and Software

• SLIB Scheme Library
• WB B-Tree Databases for SCM.
• Scheme - Dai Inukai gives excellent help and information about compiling, installing, and using SCM and other implementations on a variety of platforms.
• SCM for Macintosh (original site)
• Galapagos interactive multithreaded Scheme interpreter with turtle graphics for Windows 95.
• SCM for PocketPC running PocketConsole
• Guile Universal Scripting Language
• SCM interface to MYSQL
• The #! program implements "#!" (POSIX) shell-scripts for MS-DOS batch files.
  Fetch http://groups.csail.mit.edu/mac/ftpdir/scm/sharpbang.zip or http://groups.csail.mit.edu/mac/ftpdir/scm/#!.zip and unzip into a %PATH% directory.

Miscellany

• About SCM Interpreter Speed
• SCM Interpreter Latency
• Using SCM in Engineering
• FTP Links to SCM and related software from this site and mirrors.
• htmls.zip, a collection of these html documentation files (600.kB)