Please do as much as you can to aid the debugging process.

Can you provide these traces?

Also, can you try to bisect down to the first GCC that breaks this for you? There have been a lot of GCCs between 4.7.1 and 4.8.0 (can you try with 4.8.1 now?)
I'm very sorry, I'd be glad to help, but unfortunately reporting is all I can do for now as I'm out of time (the semester is ending :)...

If this issue is not solved in 2 or 3 weeks later, I'd sure join in helping you to pin it down. I think there should be someone with Qt 4.8.5 and this MinGW-w64 distribution to test it out.

*HINT:* When Qt is built, to rebuild only QtCore with different flags, and to play around with it (without reconfiguring and rebuilding the whole Qt), go to <qt-build-root>/src/corelib/. Now in Makefile.Release you can edit CFLAGS and CXXFLAGS for QtCore exclusively.
To rebuild, in <qt-build-root> do:

make sub-corelib-clean

to clean output of previous QtCore build, and

make sub-corelib

to rebuild only QtCore (with newly edited flags).

Regards,
Haroogan

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