Re: Qt3 breakage since 1.5.19

["Yaakov S (Cygwin Ports)" <yselkowitz at users dot sourceforge dot net>]

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René Berber wrote:
> Or the change exposed a bug in Qt.

Either way, it was working in 1.5.18 (didn't I already say I'd be
unhappy if my qt3 was broken with 1.5.19?).

> The library is as close as it gets to a regular library, I separated the debug
> info, it's just not optimized.
> 
> It would be interesting to test a rebuilt regular library, have you done that?

Actually, now that you mention it...

I was in the middle of building kdelibs-3.5.1 when gcc choked on
uic-generated code (this happened with both 3.3.4 and 3.3.5).  So I went
back to rebuild 3.3.4, and now it won't finish either.

g++ -c -pipe -I/usr/include/postgresql/server
- -I/usr/include/postgresql/pgsql -I/usr/include/postgresql/pgsql/server
- -fno-exceptions -DPIC -Wall -W -O2 -D_REENTRANT  -DDESIGNER
- -DQT_INTERNAL_XML -DQT_INTERNAL_WORKSPACE -DQT_INTERNAL_ICONVIE
W -DQT_INTERNAL_TABLE -DQT_TABLET_SUPPORT -DQT_NO_DEBUG
- -DQT_THREAD_SUPPORT
- -I/home/Yaakov/src/kde/qt/3/qt-x11-free-3.3.4/.build/mkspecs/cygwin-g++
- -I. -I/usr/include/freetype2 -I../shared -I../uilib -I../../../include
- -I/usr/X11R6/include -I.moc/release-shared-mt/ -o ./listboxeditor.o
listboxeditor.cpp
listboxeditor.cpp:32:7: warning: no newline at end of file
listboxeditor.cpp: In constructor
'ListBoxEditorBase::ListBoxEditorBase(QWidget*, const char*, bool, uint)':
listboxeditor.cpp:32: error: expected identifier at end of input
listboxeditor.cpp:32: error: expected `(' at end of input
listboxeditor.cpp:32: error: expected `{' at end of input
listboxeditor.cpp: At global scope:
listboxeditor.cpp:32: warning: unused parameter 'parent'
listboxeditor.cpp:32: warning: unused parameter 'name'
listboxeditor.cpp:32: warning: unused parameter 'modal'
listboxeditor.cpp:32: warning: unused parameter 'fl'
listboxeditor.cpp:32: warning: unused parameter 'parent'
listboxeditor.cpp:32: warning: unused parameter 'name'
listboxeditor.cpp:32: warning: unused parameter 'modal'
listboxeditor.cpp:32: warning: unused parameter 'fl'
make: *** [listboxeditor.o] Error 1

Looking at the generated listboxeditor.cpp (and at the KDE package), it
seems that uic doesn't compile .ui files correctly, resulting in the
above gcc errors.

Running the uic command to generate this code in gdb, I get a bunch of
SIGSEGV in pthread_mutex* functions in cygwin1.dll, then:

Program received signal SIGSEGV, Segmentation fault.
0x713f33a4 in QRealMutexPrivate::QRealMutexPrivate ()
   from
/home/Yaakov/src/kde/qt/3/qt-x11-free-3.3.4/.build/bin/cygqt-mt-3.dll

The offending code is in src/tools/qmutex_unix.cpp (which has absolutely
no changes from 3.3.4 to 3.3.5).

> All those "mutex lock failure" point to the threads implementation.  If you want
> to go from "what changed in Cygwin's dll" forward, it has to be something in
> threads.
> 
> Going the other way, what I tried is using gdb trying to look at what breaks the
> program.  The worst part is that under gdb they run fine many times, then break
> (with the debug library).
>
> Yet another approach could be to do the porting of the newer 3.x/4.x version.

Same story with 3.3.5, but it's still hard-masked unstable on Gentoo, so
I'm holding it back (at least until I see how KDE 3.5 works with it).
Qt4 is totally different and incompatible with qt3 (but will be parallel
installable, once I get working on it).  Let's get this working first,
though.


Yaakov
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