WING Is Not GNU.

WING is an attempt to build tools that people familiar with unix will miss,
in a way that will play nicely with a Windows environment.

WING is distinct from every other project I have seen that implements unix
tools for Windows in that making Windows look and feel like a unix shell
is an explicit non-goal.  Avoiding gratuitious incompatibilities with SUSv3
(and with historic unix practice, where SUSv3 underspecifies or fails to
define functionality that I finds useful) is a goal, but incompatibilities
or extensions that are required to play nicely in a Windows environment
are not considered gratuitious.

To the extent that it can be accomplished with a reasonable amount of
effort, WING tools will be portable to various unixes as well.  This is
primarily for convenience of development, and it is not expected that WING
will offer anything that will convince users of any unix flavor to replace
their existing tools.

WING also serves as a sandbox for experimenting with multi-platform,
multi-toolchain builds, which are not handled well by any build tools I
know of.

Known deficiencies in WING proper:
-Very few tools actually exist, and the ones that do are closely tied to
 the idiosyncratic desires and whims of the implementor.
-Interaction with PowerShell-style pipelines (instead of text inputs and
 outputs) has not been attempted, and may turn out to be well beyond the
 scope of this effort.
-Everything assumes ASCII, or at least single-byte, character sets (even
 UTF8-encoded multibyte characters are handled wrong for things like
 counting columns.)
-SUSv3 getopt does not handle long options, which classical DOS and Windows
 tools use, and it is not obvious that GNU getopt_long will cleanly handle
 the Windows style.

Known deficiencies in the WING build system:
-All toolchain details are hard-coded, and need to be edited by hand (in
 rules.ninja) for each new system.
-Finding known toolchains on a new system is not automated.
-All build rules assume the existence and names of two specific toolchains
 (host and mingw).
-Ninja build files are verbose and repetitive to write by hand.