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From: "Gary V. Vaughan" <gary AT oranda DOT demon DOT co DOT uk>
Organization: GNU
To: "Charles S. Wilson" <cwilson AT ece DOT gatech DOT edu>,
        Robert Collins <robert DOT collins AT itdomain DOT com DOT au>
Subject: Re: ld --auto-import for cygwin and libtool
Date: Mon, 11 Jun 2001 23:46:07 +0100
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Cc: libtool AT gnu DOT org, cygwin-apps AT cygwin DOT com, binutils AT sources DOT redhat DOT com,
        Paul Sokolovsky <Paul DOT Sokolovsky AT technologist DOT com>
References: <020601c0f27b$d579ea90$0200a8c0 AT lifelesswks> <3B24EB50 DOT 94F666B3 AT ece DOT gatech DOT edu>
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On Monday 11 June 2001  5:01 pm, Charles S. Wilson wrote:
> Robert Collins wrote:
> > 1) build-relink.test spits out
> > "shlibpath_overrides_runpath should be set to yes."
> > I'm not sure what that should be for cygwin, so I'm referring the
> > question to the libtool list :]. I'm happy to dig further if the issue
> > is a bug, but if setting this to yes is the correct action there's
> > little to do :].
>
> This isn't an error message, is it?  In any case, I don't think the MS
> runtime linker allows the dll itself or an executable to specify a shlib
> search path.  The runtime linker always follows this search order:
>   (a) look in the same directory as the executable which needs the
> shlib.
>   (b) search the system $PATH
> Win2K added a new twist, but I forget the details.  Something about
> adding a second file in the same directory as the exe (say, foo.exe),
> called 'foo.path' or somesuch.  That second file can then specify where
> the needed dlls should be searched for first.  Or something.  This was
> discussed on the cygwin-apps mailing list...go check that for the real
> details.  In any case, this second file is a *second* file == the exe
> *itself* can't override the default shlib search path.
>
> So, I think this should be "no" on cygwin (and mingw, and pw32...)

Currently, on the various windows platforms, shlibpath_var is set to PATH,
so setting shlibpath_var does indeed override the runpath (in a manner of 
speaking).

There are two ways to fix this:
  i) deem that $PATH is _not_ the shlibpath_var and leave it unset.
 ii) set shlibpath_overrides_runpath=yes to indicate that this works:

	$ PATH=/where/all/my/dlls/live:$PATH foo.exe

The second looks correct to me... and libtool seems to agree with me ;-b

Cheers,
	Gary.
-- 
  ())_.  Gary V. Vaughan     gary@(oranda.demon.co.uk|gnu.org)
  ( '/   Research Scientist  http://www.oranda.demon.co.uk        ,_())____
  / )=   GNU Hacker          http://www.gnu.org/software/libtool   \'      `&
`(_~)_   Tech' Author        http://sources.redhat.com/autobook    =`---d__/