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Date: Wed, 4 May 2005 09:27:15 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: John Williams <jwilliams AT itee DOT uq DOT edu DOT au>
cc: cygwin AT cygwin DOT com
Subject: Re: pwd vs $PWD, bash, cygwin vs Linux
In-Reply-To: <42785B91.6060601@itee.uq.edu.au>
Message-ID: <Pine.GSO.4.61.0505040921280.1454@slinky.cs.nyu.edu>
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On Wed, 4 May 2005, John Williams wrote:

> Christopher Faylor wrote:
>
> > > > In this case, the operative observation is bash != ash.  PWD is a
> > > > bash construct.  You would be much better off just using the gnu
> > > > make "CURDIR" variable.  Changing PWD to CURDIR in your examples
> > > > makes things work as you'd expect.
> > >
> > > Thanks for the quick response and workaround.
> > >
> > > While what you say might be a true statement, "better off" means
> > > different things to different people!
> >
> > > What surprised me was that the same shell, and same make, resulted
> > > in different behaviour.  I guess this is just reflecting differences
> > > in the underlying process architectures of Linux vs Windows.
> >
> > Again, it *isn't* the same shell.  You have now learned that it isn't
> > the same shell and you now know that this is the reason for the
> > inconsistency.  ash isn't normally used as /bin/sh on linux.  A
> > stripped down version of ash is used as /bin/sh for performance
> > purposes on cygwin.  ash does not set PWD.
>
> OK - I see the confusion.  Make is spawning ash as the subshell, not
> bash. Now everything you said makes sense.  Out of interest, can that
> behaviour be modified at the runtime/user/Makefile level?

In addition to what Gary said, you could also try the following (WARNING:
untested), which isn't as drastic:

mount -u -f -b -x "`cygpath -aw /bin/bash.exe`" /bin/sh.exe
mount -u -f -b -x "`cygpath -aw /bin/bash`" /bin/sh
make
umount -u /bin/sh.exe
umount -u /bin/sh

I may have gotten some flags slightly wrong -- "man mount" should help
with that.
HTH,
	Igor
-- 
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     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
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