Sampleextension is the "official" example of a Tcl extension. Write some C functions, and then follow the quick start guide below to add the required autogoo to get it to compile as an extension.
Note that the first link above is to the Fossil repository.
The Tcl sample extension implements an extension calculating the Core Secure Hash Algorithm (sha1). It demonstrates a TEA-conformant Tcl extension that includes a C library that can be dynamically loaded. It also illustrates the TEA directory structure and use of Tcl autoconf extensions to to provide configure and make facilities.
# Replace quux with the name of your extension EXTNAME=quux wget -qO- http://core.tcl.tk/sampleextension/tarball/${EXTNAME}.tar.gz | tar xzv cd ${EXTNAME} wget -qO- http://core.tcl.tk/tclconfig/tarball/tclconfig.tar.gz | tar xzv # Write your source files # Edit configure.in autoconf # And then the usual: ./configure make
The wget commands in the above fetch from the respective Fossil repositories, so they should be the latest stable version.