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List:       kde-bugs-dist
Subject:    [Bug 283479] cannot start ktimetracker
From:       Petr Běhan <huancz () gmail ! com>
Date:       2012-08-06 14:10:33
Message-ID: bug-283479-17878-PQqNX5znFg () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=283479

Petr Běhan <huancz@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |huancz@gmail.com

--- Comment #36 from Petr Běhan <huancz@gmail.com> ---
I have been plagued for a few months by this problem, or at least a problem
with the same symptoms: ktimetracker pops modal dialog saying "could not create
ktimetrackerpart" and then opens empty window. For me, it's 100% correlated
with compiler used. I first noticed it after upgrading to gcc-4.7-alpha, and
it's been that way ever since. If I rebuild my system (gentoo x86_64) using
gcc-4.7.anything, ktt is broken. If I then switch compiler to 4.6.3 and rebuild
ktimetracker package, it works again (rest of system can stay built with 4.7).

Here is my attempt to poke at it a bit with gdb, but without any real QT
knowledge, I have no idea what to try next:

KTimeTracker compiled with gcc-4.7.2_pre9999 (snapshot of gcc-4_7-branch from
Sat Aug 4 00:17:53, but been the same since 4.7.0 release):
(gdb) frame
#0  qobject_cast<ktimetrackerpart*> (object=0x5b5360) at
/usr/include/qt4/QtCore/qobject.h:380
380         return
static_cast<T>(reinterpret_cast<T>(object)->staticMetaObject.cast(object));
(gdb) bt
#0  qobject_cast<ktimetrackerpart*> (object=0x5b5360) at
/usr/include/qt4/QtCore/qobject.h:380
#1  0x000000000043eff6 in KPluginFactory::create<ktimetrackerpart>
(this=0x523310, parent=0x652b00, args=...) at /usr/include/kpluginfactory.h:509
#2  0x000000000043da02 in MainWindow::MainWindow (this=0x652b00, icsfile=...,
__in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at
/usr/src/debug/kde-base/ktimetracker-4.9.0/ktimetracker-4.9.0/ktimetracker/mainwindow.cpp:68
#3  0x0000000000422adc in main (argc=1, argv=0x7fffffffd868) at
/usr/src/debug/kde-base/ktimetracker-4.9.0/ktimetracker-4.9.0/ktimetracker/main.cpp:128
(gdb) print reinterpret_cast<T>(object)
$15 = (ktimetrackerpart *) 0x5b5360
(gdb) print reinterpret_cast<T>(object)->staticMetaObject.cast(object)
$16 = (QObject *) 0x0 <====== This 0x0 is then returned and causes message box
to appear.

Similar session when compiled with 4.6.3:
(gdb) bt
#0  qobject_cast<ktimetrackerpart*> (object=0x555000) at
/usr/include/qt4/QtCore/qobject.h:380
#1  0x000000000043f3b8 in KPluginFactory::create<ktimetrackerpart>
(this=0x54c910, parent=0x671d20, args=...) at /usr/include/kpluginfactory.h:509
#2  0x000000000043de27 in MainWindow::MainWindow (this=0x671d20, icsfile=...,
__in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at
/usr/src/debug/kde-base/ktimetracker-4.9.0/ktimetracker-4.9.0/ktimetracker/mainwindow.cpp:68
#3  0x00000000004230ce in main (argc=1, argv=0x7fffffffd868) at
/usr/src/debug/kde-base/ktimetracker-4.9.0/ktimetracker-4.9.0/ktimetracker/main.cpp:128
(gdb) print reinterpret_cast<T>(object)
$17 = (ktimetrackerpart *) 0x555000
(gdb) print reinterpret_cast<T>(object)->staticMetaObject.cast(object)
$18 = (QObject *) 0x555000 <====== now it works

CXXFLAGS=-O0 -ggdb
-Bsymbolic-function mentioned earlier is not enabled

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