New testing workflow for Windows (was Re: [PATCH] [DOCS] How to Setup a Windows Builder)

Reid Kleckner rnk at
Wed Nov 13 10:04:55 PST 2013

This sounds awesome!  It would be really great for developers that just
want to use VS as well.  No need to go and choose one of the various sets
of Unix tools for Windows that are all slightly incompatible in different
obscure ways.

On Wed, Nov 13, 2013 at 1:07 AM, Alp Toker <alp at> wrote:

> On 13/11/2013 01:06, Sean Silva wrote:
>  +**Notice:** If you do not plan to run the test suite, or sshd server,
> you don't
> +need Cygwin. You can build LLVM + Clang with only Subversion, MingwNN,
> and CMake.
>  I feel like the way you are handling these notices is backwards.
> This is all very complicated and difficult to document!
> I'd like to share an alternative..
> At Nuanti we have a setup that can run the full test suite natively on
> Windows using only the native Microsoft toolchain and a special BusyBox
> binary, so we don't even install MingW or Cygwin on Windows development
> systems.
> This has a number of benefits:
>    - Full test coverage. Our BusyBox is patched to be compatible with
>    Unix so we get to run tests that would usually fail due to REQURES/XFAIL
>    mingw/shell/shell-preserves-root.
>    - No need for Administrator access. There is nothing to install, no
>    GNU this or that, just a fresh SVN/git checkout from
>    - Easy to set up. Just drop the single binary in your PATH or lit
>    folder.
>     - Escaping and /dev/null hacks for Windows in lit are no longer
>    needed.
>    - Full in-process execution. Forking is slow on Windows, but with our
>    approach a full test suite run is reduced close to native timings
>    comparable to other platforms.
> I was planning to upstream this work later in the 3.5 cycle but looking at
> how painful the process is at present, and more so the effort to document
> it, I feel now like it might be worth pushing ahead earlier.
> The patch to lit itself is very small / low-impact and most of the work is
> in BusyBox itself.
> I can get this work Open Sourced along with a build of the drop-in
> llvm-busybox.exe later today if it sounds desirable.
> Certainly it'd reduce much of this document to just "Copy llvm-busybox.exe
> into your PATH"
> How does this sound?
> If you like the idea, let me know soon as today's the best time for me to
> pull this all together and post the lit side of the work for review.
> Regards,
> Alp.
> --
> the browser experts
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