Windows will no longer be supported by ASDF, or ASDF, Windows, Cygwin -- oh, my!

Stas Boukarev stassats at
Mon Mar 21 13:59:27 UTC 2016

On Mon, Mar 21, 2016 at 4:16 PM, Robert Goldman <rpgoldman at> wrote:
> On 3/20/16 Mar 20 -7:07 PM, Stas Boukarev wrote:
>> Then I guess SBCL holding back on ASDF upgrades is a good strategy after all.
> Actually, no.
> The state of affairs on Windows is no worse than before.  My going back
> to the shell-script based testing simply REVEALS that ASDF and UIOP have
> never worked properly on Windows + Cygwin.  Nothing about that has
> changed: if you run a CL implementation from inside Cygwin, it will
> inherit a Cygwin environment.  Then RUN-PROGRAM will try to run local
> programs using CMD.EXE, with an environment set up for Cygwin.  If
> you're lucky, it might work.  But it's likely that the environment will
> have bad pathnames in it, and your use of RUN-PROGRAM will fail.
> Nothing there has changed.  The only thing that has changed about that
> is that I have announced it.
> So, no, a simple dragging of the feet will not fix this problem.
> The only thing that will fix this problem will be for someone who cares
> about Lisp on Windows to commit some time to helping me get ASDF to work
> properly on Windows.
> Meanwhile, not updating means that you will fail to see bug fixes like
> the recent one that prevents ASDF from causing a stack overflow in the
> presence of cycles in the file system (which can be created by symbolic
> links, for example).  I have seen more than one bug report about this
> from an SBCL user.
> Don't kid yourself that there's an easy answer.
I don't use cygwin on windows, does that mean I'm in the clear?

With best regards, Stas.

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