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• Cygwin may refer both to:

  • Cygwin runtime (cygwin1.dll), required for aarch64-pc-cygwin GNU toolchain, available at https://www.cygwin.com/git.html. Cygwin runtime , which provides the necessary POSIX APIs and the standard library implementations .for building and running POSIX-based software on Windows,

  • or the whole distribution of UNIXPOSIX-based software (https://www.cygwin.com/packages.html) compiled to run on Windows available at https://cygwin.com/packaging/repos.html.

• This project’s scope is limited to Cygwin runtime (cygwin1.dll) only. Porting of individual Cygwin packages hasn’t started yet as the aarch64-pc-cygwin GNU toolchain is and the runtime are not available upstream and it would deserve separate project pages for individual packages or some reasonable groups of packages.

• The Cygwin runtime source code consists for two main sub-projects, newlib and winsup:

  • The newlib sub-project contains implementation of standard C library (libc), and implementation of standard C mathematical library implementation (libm).

  • The winsup project is where the most of the magic of POSIX APIs and Cygwin environment implementations happen.

  • Fun fact: The newlib is a least 26 years old fork of GCC codebase (that far the git history goes) being occasionally synchronized to the upstream.

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