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Date: Fri, 24 Oct 2014 13:02:09 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 1.7.33-0.1
Message-ID: <20141024110209.GJ20607@calimero.vinschen.de>
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References: <announce DOT 20141022092323 DOT GH32374 AT calimero DOT vinschen DOT de> <A0FD00D9-6DFB-4E3D-9FDE-44BC1CAAEEDC AT Denis-Excoffier DOT org>
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On Oct 23 20:06, Denis Excoffier wrote:
> On 2014-10-22 11:23, Corinna Vinschen wrote:
> >=20
> > - Drop the current working directory from the default DLL search path in
> >  favor of Cygwin's /bin dir.
> I'm not so comfortable with this one.
>=20
> I use
> PATH=3D/my/dir/bin:/usr/bin /my/otherdir/myprog
>=20
> There is no DLL at all in /my/otherdir (this is the very first place
> for Windows to look for DLL's, and i think that this cannot change).
> In /my/dir/bin, there is an updated version of a library also
> located in /usr/bin, for example an updated cygstdc++-6.dll (from GCC 4.9=
.1).
>=20
> Does this mean that, under this change, cygstdc++-6.dll will be found
> in /usr/bin and not in /my/dir/bin ? In fact, this is what i can
> observe personnally.
>=20
> Also, i don't remember that the CWD has an impact on where DLL is found (=
apart
> from being in PATH, and apart from being the dir where the exe resides).
>=20
> For a test i have commented out in cygheap.cc the line
> 'wcpncpy (installation_dir, ...' (and also the next one)
> and the old behaviour is now back.
>=20
> It seems to me that this change is a regression. Could someone please arg=
ue?

Hmm.  It's hard to do the right thing here, I guess.  I can see how
this is a regression in your scenario.  OTOH, your scenario is not
stable.  The directories in $PATH are the last ones in the DLL search
order.  So, your scenario already wouldn't work if your CWD is /bin
(or /usr/bin).

=46rom Cygwin's POV {/usr}/bin is a system dir.  For security reasons it
makes sense that the system DLLs in /bin cannot be overridden, unless
it's an installation issue which should be covered by looking into the
application installation dir first.

Having said that, moving your DLLs into the application dir is really
not an option?

Does anybody else have a similar scenario to cover, which doesn't work
anymore with this change?


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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