qt4 broken on i686

[Jan Rękorajski]

On Thu, 19 Aug 2021, Jakub Bogusz wrote:

> On Wed, Aug 18, 2021 at 10:34:48PM +0200, Jan Rękorajski wrote:
> > New builds of qt4 on i686 exhibit crashes (ex. linguist in avogadro), or
> > infinite looping (ex. meinproc4 in kde4-kig).
> > 
> > I'm running out of ideas[1] and time to troubleshoot this and would
> > appreciate if anyone would be willing to try and figure out WTF is
> > broken there.
> > 
> > [1] neither -O0, nor -std=gnu98 seem to do the trick, it could be a
> > glibc 2.34 issue, but I don't have resources at hand to validate it.
> 
> I don't know yet if it's related to glibc, gcc or binutils, but simple
> testcase is searching in empty QMap:
> 
> ```
> #include <QtCore/QMap>
> 
> int main()
> {
>     QMap<int, std::string> mm;
>     mm.constFind(999);
> }
> ```
> 
> It hangs even on carme-x86_64.
> 
> Issue is probably related to shared_null static field (SIOF?)

My take is on gcc 11. I downgraded everything but gcc and it still crashed.

To verify that it's indeed gcc I need to rebuild it (gcc) locally due to
intertwined deps preventing simple package downgrade.

-- 
Jan Rękorajski                    | PLD/Linux
SysAdm | baggins<at>pld-linux.org | http://www.pld-linux.org/