2.6 Microsoft Windows
In 1995, Microsoft released Windows 95, which soon became the
most widely-used operating system in the world. Autoconf and Libtool
were written to support portability across Unix variants, but they
provided a framework to support portability to Windows as well. This
made it possible for a program to support both Unix and Windows from a
single source code base.
The key requirement of both Autoconf and Libtool was the Unix shell.
The GNU bash shell was ported to Windows as part of the Cygwin
project, which was originally written by Steve Chamberlain. The Cygwin
project implements the basic Unix API in Windows, making it
possible to port Unix programs directly.
Once the shell and the Unix
make program (also provided by
Cygwin) were available, it was possible to make Autoconf and Libtool
support Windows directly, using either the Cygwin interface or the
Visual C++ tools from Microsoft. This involved handling details like
the different file extensions used by the different systems, as well as
yet another set of shared library features. This first version of this
work was by Ian Lance Taylor in 1998. Automake has also been ported to
Windows. It requires Perl to be installed (see section A.1 Prerequisite tools).