[Bug 40528] Cygwin installs (with errors) but doesn't work at all

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40528

Angus Gratton <gus at projectgus.com> changed:

           What    |Removed                     |Added
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                 CC|                            |gus at projectgus.com

--- Comment #4 from Angus Gratton <gus at projectgus.com> ---
Found this issue while trying to run MSYS2 (which uses Cygwin) on wine-staging
2.15.

There's a matching MSYS2 bug here:
https://github.com/Alexpux/MSYS2-packages/issues/682

>From reading through that, I understand the problem to be:
- Cygwin 2.6 removed support for Windows XP.
- That included a patch which removed pre-Vista fallback behaviour for
computing a FAST_CWD structure[1].
- On Wine, Cygwin happened to be using that fallback behaviour for FAST_CWD, as
Cygwin's find_fast_cwd_pointer() seems to always fail[2] under wine.

So, currently Wine can't run Cygwin 2.6 or newer.

[1] https://cygwin.com/ml/cygwin-cvs/2016-q2/msg00099.html
[2]
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/path.cc;h=475c99599a19689bd67f8b81f91ce70f79d7666e;hb=HEAD#l4277

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