Debian Bug report logs - #481642
PerlQt-based applications refuse to start !

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Vincent Fourmond <fourmond@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: PerlQt-based applications refuse to start !

Date: Sat, 17 May 2008 18:00:35 +0200

Package: libqt-perl
Version: 3.008-3+b1
Severity: grave


  Hello,

  Applications based on Perl/Qt now refuse to start with an error in the spirit
of

~ perl progress.pl 
--- No method to call for :
        QApplication::new('Qt::Applic...', ARRAY(0x622db8))
at /usr/lib/perl5/Qt.pm line 464.

  This includes the examples. I don't know if examples used to work, but my
own applications used to ;-)... Severity Grave because nothing based on 
Perl/Qt seems to work anymore.

  I'm a bit awkward about downgrading it, since that implies switching back to
perl 5.8...

  Feel free to ask for more information...

       Vincent
  

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.24-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB, LC_CTYPE=en_GB (charmap=ISO-8859-1) (ignored: LC_ALL set to en_GB)
Shell: /bin/sh linked to /bin/dash

Versions of packages libqt-perl depends on:
ii  libaudio2              1.9.1-2           Network Audio System - shared libr
ii  libc6                  2.7-11            GNU C Library: Shared libraries
ii  libfontconfig1         2.5.0-2           generic font configuration library
ii  libfreetype6           2.3.5-1+b1        FreeType 2 font engine, shared lib
ii  libgcc1                1:4.3.0-4         GCC support library
ii  libice6                2:1.0.4-1         X11 Inter-Client Exchange library
ii  libjpeg62              6b-14             The Independent JPEG Group's JPEG 
ii  libpng12-0             1.2.27-1          PNG library - runtime
ii  libqt3-mt              3:3.3.8b-5        Qt GUI Library (Threaded runtime v
ii  libsm6                 2:1.0.3-1+b1      X11 Session Management library
ii  libsmokeqt1            4:3.5.9-1+b1      SMOKE Binding Library to Qt
ii  libstdc++6             4.3.0-4           The GNU Standard C++ Library v3
ii  libx11-6               2:1.0.3-7         X11 client-side library
ii  libxcursor1            1:1.1.9-1         X cursor management library
ii  libxext6               2:1.0.4-1         X11 miscellaneous extension librar
ii  libxft2                2.1.12-2          FreeType-based font drawing librar
ii  libxi6                 2:1.1.3-1         X11 Input extension library
ii  libxinerama1           2:1.0.3-1         X11 Xinerama extension library
ii  libxrandr2             2:1.2.2-1         X11 RandR extension library
ii  libxrender1            1:0.9.4-1         X Rendering Extension client libra
ii  libxt6                 1:1.0.5-3         X11 toolkit intrinsics library
ii  perl                   5.10.0-10         Larry Wall's Practical Extraction 
ii  perl-base [perlapi-5.1 5.10.0-10         The Pathologically Eclectic Rubbis
ii  zlib1g                 1:1.2.3.3.dfsg-12 compression library - runtime

libqt-perl recommends no packages.

-- no debconf information

Message #10 received at 481642@bugs.debian.org (full text, mbox, reply):

From: Bart Martens <bartm@debian.org>

To: 481642@bugs.debian.org

Subject: libqt-perl: PerlQt-based applications refuse to start

Date: Sun, 18 May 2008 10:40:46 +0200

[Message part 1 (text/plain, inline)]

tags 481642 confirmed help
stop


The example "perl progress.pl" works with libqt-perl version 3.008-3 and
perl 5.8.  It does not work with libqt-perl version 3.008-3+b1 and perl
5.10.  0-day delay NMU to fix this bug is most welcome.

[signature.asc (application/pgp-signature, inline)]

Message #17 received at 481642@bugs.debian.org (full text, mbox, reply):

From: Vincent Fourmond <fourmond@debian.org>

To: 481642@bugs.debian.org, control@bugs.debian.org

Subject: Bug481642: working on it

Date: Mon, 19 May 2008 20:05:09 +0200

claim 481642 !
thanks

[please don't forget the -submitter, so I'm aware of your replies ;-)...]

  It seems I have found at least one of the causes of the problem. The

my $a=Qt::Application(\@ARGV);

statement in perl 5.8 causes do_autoload to be called with the following
arguments:

'Qt::Application' 'QApplication' '4'

while in perl 5.10, it is called thus:

'Qt::Application' 'new' '4'

Surely can't work that well...

  I'll try to find a fix or a workaround as soon as possible.

  Cheers,

	Vincent

-- 
Vincent Fourmond, Debian Developer
http://vince-debian.blogspot.com/

find(1):

 A `%' at the end of the format argument causes undefined behaviour
 since there is no following character. In some locales, it may
 hide your door keys, while in others it may remove the final page
 from the novel you are reading.

Message #22 received at 481642@bugs.debian.org (full text, mbox, reply):

From: Vincent Fourmond <fourmond@debian.org>

To: 481642@bugs.debian.org

Subject: Bug #481642: escapes my poor perl knowledge

Date: Mon, 19 May 2008 22:12:52 +0200

  Hello,

  I can get it the example to run a little further, but not much
further, and it produces errors I don't understand. We'll need Perl 5.8
to 5.10 transition wizards for that... I'm afraid this problem is way
beyond my Perl skills.

  Cheers,

	Vincent

-- 
Vincent Fourmond, Debian Developer
http://vince-debian.blogspot.com/

find(1):

 A `%' at the end of the format argument causes undefined behaviour
 since there is no following character. In some locales, it may
 hide your door keys, while in others it may remove the final page
 from the novel you are reading.

Message #27 received at 481642@bugs.debian.org (full text, mbox, reply):

From: Gunnar Wolf <gwolf@gwolf.org>

To: control@bugs.debian.org, 481642@bugs.debian.org

Subject: Re: PerlQt-based applications refuse to start !

Date: Tue, 20 May 2008 10:52:02 -0500

tags 481642 + upstream
thanks

Forwarded to the CPAN Request Tracker,
http://rt.cpan.org/Ticket/Display.html?id=36045 

-- 
Gunnar Wolf - gwolf@gwolf.org - (+52-55)5623-0154 / 1451-2244
PGP key 1024D/8BB527AF 2001-10-23
Fingerprint: 0C79 D2D1 2C4E 9CE4 5973  F800 D80E F35A 8BB5 27AF

Message #36 received at 481642@bugs.debian.org (full text, mbox, reply):

From: Steve Cotton <steve0001@s.cotton.clara.co.uk>

To: 481642@bugs.debian.org

Subject: Appears to be caused by a circular dependency

Date: Sat, 30 Aug 2008 15:50:19 +0100

[Message part 1 (text/plain, inline)]

There's a circular dependency between Qt.pm and Qt/debug.pm.
Combining that with this complex autoloader seems to be the source
of the problem.

Forcing the debug module to load before main module works:
  perl -MQt::debug ./aclock.pl
  perl -MQt::debug -MQt ./aclock.pl
the following fails:
  perl -MQt -MQt::debug ./aclock.pl

Breaking the circular dependency by removing either module's "use"
statement makes the module work.

  However, removing it from the debug.pm file means that
  attempting to turn debugging on with either of
    perl -MQt::debug ./aclock.pl
    perl -MQt::debug=verbose ./aclock.pl
  crashes.

  Removing it from the main Qt.pm sounds wrong but seems ok -
  Qt.pm checks the debugging module's variables, but uses fully
  qualified names to do it.  (patch attached)

I haven't understood how this packages's autoloading code does
what it's supposed to, but my cargo cult can get cargo to land.

Steve

[libqt-perl_481642_break_circular_dependency.patch (text/x-diff, attachment)]

Message #41 received at 481642@bugs.debian.org (full text, mbox, reply):

From: Steve Cotton <steve0001@s.cotton.clara.co.uk>

To: control@bugs.debian.org

Cc: 481642@bugs.debian.org

Subject: 481642 patched

Date: Mon, 1 Sep 2008 18:42:13 +0100

tags 481642 + patch
quit

Delayed over marking this as patched due to the cargo-cultery of
my change.  But it will be better to get it built and tested than
to leave it for a final "what do we do with these RC bugs" sweep.

Leaving it tagged "help" for now.

Steve

Message #48 received at 481642-close@bugs.debian.org (full text, mbox, reply):

From: Marc 'HE' Brockschmidt <he@debian.org>

To: 481642-close@bugs.debian.org

Subject: Bug#481642: fixed in libqt-perl 3.008-3.1

Date: Sat, 06 Sep 2008 21:17:40 +0000

Source: libqt-perl
Source-Version: 3.008-3.1

We believe that the bug you reported is fixed in the latest version of
libqt-perl, which is due to be installed in the Debian FTP archive:

libqt-perl_3.008-3.1.diff.gz
  to pool/main/libq/libqt-perl/libqt-perl_3.008-3.1.diff.gz
libqt-perl_3.008-3.1.dsc
  to pool/main/libq/libqt-perl/libqt-perl_3.008-3.1.dsc
libqt-perl_3.008-3.1_i386.deb
  to pool/main/libq/libqt-perl/libqt-perl_3.008-3.1_i386.deb



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 481642@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Marc 'HE' Brockschmidt <he@debian.org> (supplier of updated libqt-perl package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


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Hash: SHA1

Format: 1.8
Date: Sat, 06 Sep 2008 22:09:32 +0200
Source: libqt-perl
Binary: libqt-perl
Architecture: source i386
Version: 3.008-3.1
Distribution: unstable
Urgency: low
Maintainer: Bart Martens <bartm@debian.org>
Changed-By: Marc 'HE' Brockschmidt <he@debian.org>
Description: 
 libqt-perl - Perl bindings for the Qt library
Closes: 481642
Changes: 
 libqt-perl (3.008-3.1) unstable; urgency=low
 .
   * Non-maintainer upload.
   * Use patch from Steve Cotton <steve0001@s.cotton.clara.co.uk>
     to break a ``use'' cycle between Qt and Qt::debug. Closes: #481642
Checksums-Sha1: 
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 e2aba21496abd3f1c8d3db1aa88e9e5cae409116 5064 libqt-perl_3.008-3.1.diff.gz
 accba75d0f19201a612710219f2fab9df42c2ca9 243510 libqt-perl_3.008-3.1_i386.deb
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 f72e7dae6ad27549740797350eb16a3d0b2d8f476dd3c4586e0445e23aa13dcb 5064 libqt-perl_3.008-3.1.diff.gz
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