Hello List,
I have a strange behavior when the executing a program in a shell. I'm on Windows 10 Version 22H2 (OS Build 19045.2251). The strange behavior occurs when the current directory is on a drive created with subst.

Originally I found the problem in a MSYS shell and already reported the problem here https://github.com/msys2/msys2.github.io/issues/234. In a reply someone asked me to check how it behaves under cygwin.

Here are the steps to reproduce the problem.

Inside a Windows CMD

C:\Users\f.redeker>subst s: "C:\Program Files\Common Files\System"
C:\Users\f.redeker>subst
S:\: => C:\Program Files\Common Files\System


On a computer with an older cygwin intallation

$ uname -a
CYGWIN_NT-6.1-WOW Mimir 2.9.0(0.318/5/3) 2017-09-12 10:41 i686 Cygwin

$ sh --version
GNU bash, version 4.4.12(3)-release (i686-pc-cygwin)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

$ pwd
/cygdrive/s/ado

$ realpath /cygdrive/s/ado/msadox.dll
/cygdrive/s/ado/msadox.dll

$ realpath msadox.dll
/cygdrive/s/ado/msadox.dll


On a computer with a more actual version,

$ uname -a
CYGWIN_NT-10.0-19045 MIMIR-2 3.3.6-341.x86_64 2022-09-05 11:15 UTC x86_64 Cygwin

$ sh --version
GNU bash, version 4.4.12(3)-release (x86_64-unknown-cygwin)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

$ pwd
/cygdrive/s/ado

$ realpath /cygdrive/s/ado/msadox.dll
/cygdrive/s/ado/msadox.dll

$ realpath msadox.dll
/cygdrive/c/Program Files/Common Files/System/ado/msadox.dll


Is there any way to restore the old behavior. Since with the new behavior my tests no longer work.

Mit freundlichen Grüßen / Best Regards

Frank Redeker

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