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Date: Wed, 22 Dec 2010 20:18:22 +0100
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Subject: Re: ATTN: Perl maintainer - RE: Problem with Perl/Tk and Pixmap
From: Reini Urban <rurban AT x-ray DOT at>
To: cygwin AT cygwin DOT com
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2010/12/22 Thrall, Bryan:
> Thrall, Bryan wrote on 2010-12-16:
>> Andrew DeFaria wrote on 2010-12-16:
>>> =A0 On 12/16/2010 02:07 PM, Johannes v. L=F6wis wrote:
>>>> I have a Perl/Tk script that is supposed to show a pixmap on the left
>>>> side of the title bar of the main window. It works on Linux and on a
>>>> rather old version of Cygwin 1.5. On Cygwin 1.7 (on XP Home and Prof)
>>>> the following happens:
>>>>
>>>> $ ./logotest.pl Can't bless non-reference value at
>>>> /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Image.pm line 23. ...
>>>> Any ideas or suggestions what further information I could provide in
>>>> order to sort this out?
>>>>
>>> Reproduced. Note you problem appears to be with Tk::Image, not with
>>> Cygwin, though you are right in that it works on Linux and complains
>>> and dies on Cygwin.
>>>
>>> Interestingly, if you run your program and the Perl debugger (i.e. perl
>>> -d logtest.pl) then simply type c for continue it works fine.
>>>
>>> Looking at Image.pm I see that if I break at Image.pm:23 there's a
>>> "return bless $obj,$package" statement. In the debugger, $obj is
>>> defined and there's no problem. If, however, I just run this without
>>> the debugger, but put some print statements in Image.pm, I see that
>>> $obj is indeed returned from $widget->Tk::image as undefined.
>>>
>>> This appears to be a Perl/Tk bug.
>>>
>>> Even stranger! Change your
>>>
>>> =A0 =A0$mw->Pixmap('logo', -data=3D>$icon);
>>> to
>>>
>>> =A0 =A0my $foo $mw->Pixmap('logo', -data=3D>$icon);
>>> and it works! So you have =A0a work around, and a bug to report.
>>
>> I also can reproduce the problem.
>>
>> This behavior reminds me of a perl-Tk packaging bug from last year:
>>
>> http://www.cygwin.com/ml/cygwin/2009-07/msg00890.html
>>
>> In fact, /usr/bin/widget seems to be broken again, unless you run it in
>> the perl debugger:
>>
>> thrall AT pc1163-8413-xp ~
>> $ /usr/bin/widget
>> Can't set -labelFont to `Courier 12 bold' for
>> Tk::LabEntry=3DHASH(0x1067dac0): unknown option "-labelFont" at
>> /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 294.
>>
>> =A0at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 306
>> thrall AT pc1163-8413-xp ~
>> $ cygcheck -cd perl perl-Tk
>> Cygwin Package Information
>> Package =A0 =A0 =A0 =A0 =A0 =A0 =A0Version
>> cygwin =A0 =A0 =A0 =A0 =A0 =A0 =A0 1.7.7-1
>> perl =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 5.10.1-4
>> perl-Tk =A0 =A0 =A0 =A0 =A0 =A0 =A0804.029-1
>>
>
> It seems I have unfairly blamed Perl-Tk for these problems; reverting to =
perl-5.10.1-3 fixes both the OP's Pixmap problem and the widget problem on =
my machine.

I hear.
Known problem with certain XS modules.

With -4 I had to recompile core and all XS modules and apparently some
old modules
are not binary compatible anymore, although the configuration did not chang=
e.
Only the environment did change.

The solution is to recompile the failing XS modules or revert perl back to =
-3
perl-Tk would need an upgrade against -4.
--=20
Reini Urban

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