libQtCore.so.4.6.0 lacks a symbol

[Gustaw Smolarczyk]

libQtCore.so.4.6.0 lacks a symbol which is needed by many applications (including kde apps, like kate, konqueror or kopete).
This is _ZN9QHashData13detach_helperEPFvPNS_4NodeEPvEPFvS1_Ei symbol, which is QHashData method detach_helper(). It was removed from source in upstream [1].

[1] http://qt.gitorious.org/qt/qt/commit/e83bb2fdfc2dc899526c8157fd8b77a68cdde9da

[Alessandro Ghersi (alessandro-ghersi)]

That commit is already in qt 4.6.0 rc1

[Gustaw Smolarczyk (wielkiegie)]

To make KDE happy we should re-introduce that detach_helper overload. It should be very simple, not harm any other area and make KDE apps work again.

[Gustaw Smolarczyk (wielkiegie)]

Ok, I hope that recompilation of KDE with new Qt will suffice.

Next time when I'll try to help others by testing development ubuntu branch I'll have thought more than twice before I'll post any bug report :)

[Anderson (amg1127)]

@wielkiegie

How did you discover the missing "_ZN9QHashData13detach_helperEPFvPNS_4NodeEPvEPFvS1_Ei" symbol is related to QHashData::detach_helper()? I think I should learn how to do this kind of procedure... :-)

Could you explain me?

Thanks.

[Terence Simpson (tsimpson)]

use c++filt from the binutils package:
$ echo "_ZN9QHashData13detach_helperEPFvPNS_4NodeEPvEPFvS1_Ei" | c++filt
QHashData::detach_helper(void (*)(QHashData::Node*, void*), void (*)(QHashData::Node*), int)

[Gustaw Smolarczyk (wielkiegie)]

Like Terence said, use c++filt or demangle from kmtrace package, which has less features and reads mangled symbols from stdin too.

[Jonathan Thomas (echidnaman)]

These apps just need rebuilt, which they have been for the most part on Lucid.