Re: Problems with Libtiff, Libpng

["Charles S. Wilson" <cwilson at ece dot gatech dot edu>]

@#$!%@!

Thank you for reporting this problem with libpng.dll. I asked for
problem reports, and got none. Therefore I assumed that the libpng-1.0.8
was ready for primetime.

I am sorry that appears to not be the case. 

But, you know what? Since nobody bothered to report any of these
problems at the time, and only happened to mention them in passing
almost a month later -- I no longer care. You obviously have known about
the problem with libpng, libz and OpenDX for some time, but neglected to
tell anybody about it.

--Chuck

P.S. It is well known (among the png-developers) that libpng-1.0.6 had
certain compatibility problems. These were corrected in -1.0.7 and
1.0.8. Therefore, if OpenDX worked with -1.0.6 but not later versions,
it is because OpenDX probably hacked around the 'compatibility' problems
of 1.0.6, thus making itself incompatible with all other versions of
that library. IMO, libpng-1.0.8 is not at fault; OpenDX should be fixed
(or at least, recompiled & relinked).

P.P.S. I'd recommend that applications NOT include their own versions of
system dll's (like libz, libpng, libtiff, etc). They should be compiled
to work with the 'official' versions. That's why I built them, and
pushed to add them to the official distribution -- so that 27 different
apps wouldn't all include their own private, incompatible versions of
libz.dll.  So far, I think OpenDX and WM (and possibly X11) need to be
recompiled to use the 'official' libz and not build their own.

X11 is a special case, since it lives in its own directory
(/usr/X11R6/bin) and can take advantage of peculiarities of the windows
dynamic loader to force using its own version of libz, regardless of
$PATH.

GRENON Richard wrote:
> 
> Tom Weichmann wrote:
> >
> > Hello,
> >
> > I may have found a problem with LIBZ.DLL.  When using a binary
> > distribution of Windowmaker from the xfree project, I get an error.
> > When running 'wmaker' I get a dialog box stating:
> >
> > Error Starting Program
> > The LIBTIFF.DLL file is linked to missing export LIBZ.DLL:inflateInit_
> 
> >
> > The same error occurs in regards to LIBPNG as well.
> >
> > I am running cygwin 1.1.3 on Win98
> 
> I had similar problems with the OpendDX Cygwin binary from
> www.opendx.org, first with LIBZ.DLL when I was using Cygwin1.1.2 and
> Suhaib Siddiqi helped me to solve this problem (See opendx-users mailing
> list). Then I had a new problem with LIBPNG.DLL when I updated to Cygwin
> 1.1.4.
> 
> With Cygwin 1.1.2 I had to rename the LIBZ.DLL from the Cygwin
> distribution to make OpenDX use its own LIBZ.DLL or the X11R6 LIBZ.DLL
> (both seem identical). Check for all LIBZ.DLL on your hard drive. You
> should at least try the X11R6 one. If you don't want to rename or remove
> the Cygwin LIBZ.DLL, maybe you can modify the PATH so as the correct dll
> is found first.
> 
> When I updated to Cygwin 1.1.4, LIBZ.DLL from the Cygwin distribution
> was working with OpenDX, but not LIBPNG.DLL. As the OpenDX binary has no
> LIBPNG.DLL it should use the Cygwin one. Cygwin 1.1.4 installed
> libpng-1.0.8-1 and I had to re-install the old Cygwin libpng-1.0.6-1 in
> order to keep OpenDX working.
> 
> I hope this could help you.
>

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