[gentoo-user] Qt 4 programs segfault on startup

[gentoo-user] Qt 4 programs segfault on startup

[Peter Gille]

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Hello list,

All of the programs on my computer using qt4 segfaults on startup. When I
look in /var/log/messages I see a line like this:

Nov  9 16:15:27 duolith [1029300.702228] qttest[29812]: segfault at
100000130 ip 00007f051f392269 sp 00007fff2e3e3570 error 4 in
libqt-mt.so.3.3.8[7f051edbd000+7c4000]

which is odd, since the programs don't depend on qt3, they depend on qt4.
Programs using qt3, however, work as normal.

The program I used to get the above segfault looked like this:

#include <QApplication>

int main(int argc, char *argv[])
{
        QApplication app(argc,argv);

        return app.exec();
}


Does anyone have any idea what's going on and how to fix this?
I'm using qt-3.3.8b and qt-4.4.2

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[gentoo-user] Re: Qt 4 programs segfault on startup

[Nikos Chantziaras]

Peter Gille wrote:
> Hello list,
> 
> All of the programs on my computer using qt4 segfaults on startup.

Did you try revdep-rebuild?

Re: [gentoo-user] Re: Qt 4 programs segfault on startup

[Peter Gille]

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On Mon, Nov 10, 2008 at 1:02 AM, Nikos Chantziaras <realnc@arcor.de> wrote:

> Peter Gille wrote:
>
>> Hello list,
>>
>> All of the programs on my computer using qt4 segfaults on startup.
>>
>
> Did you try revdep-rebuild?
>
>
> Yes. The only broken binaries I have are from virtualbox, which shouldn't
affect anything.
emerge @preserved-rebuild only showed quake3 as broken.
I have already re-emerged those two anyway.

/ peter

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[gentoo-user] Re: Qt 4 programs segfault on startup

[Nikos Chantziaras]

Peter Gille wrote:
> 
> 
> On Mon, Nov 10, 2008 at 1:02 AM, Nikos Chantziaras <realnc@arcor.de 
> <mailto:realnc@arcor.de>> wrote:
> 
>     Peter Gille wrote:
> 
>         Hello list,
> 
>         All of the programs on my computer using qt4 segfaults on startup.
> 
> 
>     Did you try revdep-rebuild?
> 
> 
> Yes. The only broken binaries I have are from virtualbox, which 
> shouldn't affect anything.
> emerge @preserved-rebuild only showed quake3 as broken.
> I have already re-emerged those two anyway.

Did you check if the programs in question really do depend only on Qt4? 
  Try the ldd tool to see the libs a binary uses.

I do have "-qt4" in the USE flags though.  Try that and see how many 
packages this would rebuild (emerge -pDN world).  Yeah, this is pretty 
much shotgun debugging, but it might point to the culprit :P

Re: [gentoo-user] Re: Qt 4 programs segfault on startup

[Peter Gille]

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On Mon, Nov 10, 2008 at 6:51 PM, Nikos Chantziaras <realnc@arcor.de> wrote:

> Peter Gille wrote:
>
>>
>>
>> On Mon, Nov 10, 2008 at 1:02 AM, Nikos Chantziaras <realnc@arcor.de<mailto:
>> realnc@arcor.de>> wrote:
>>
>>    Peter Gille wrote:
>>
>>        Hello list,
>>
>>        All of the programs on my computer using qt4 segfaults on startup.
>>
>>
>>    Did you try revdep-rebuild?
>>
>>
>> Yes. The only broken binaries I have are from virtualbox, which shouldn't
>> affect anything.
>> emerge @preserved-rebuild only showed quake3 as broken.
>> I have already re-emerged those two anyway.
>>
>
> Did you check if the programs in question really do depend only on Qt4?
>  Try the ldd tool to see the libs a binary uses.


>

>
> I do have "-qt4" in the USE flags though.  Try that and see how many
> packages this would rebuild (emerge -pDN world).  Yeah, this is pretty much
> shotgun debugging, but it might point to the culprit :P


I tried this, and compared the list to the list of packages with files in
/usr/lib64/qt4/plugins/ since I had read that some people had had similar
problems with files there. app-i18n/uim-1.5.4-r1 was one of the packages and
when I re-emerged it with USE="-qt4" it appears that programs start again.
So thank you for fixing it.

However, i use this program to input japanese characters in some of the
documents I write. Is anyone aware of any other input systems which can
input japanese? Or will I still be able to input japanese into qt4 programs?

regards
/ peter

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