Found out the problem with building qt android platform plugins...

[mingw android]

I did some more testing with the new NDK on OS X, and you're right
there's some problems with it..

addr2line fails on far too many addresses (it takes a long time then gives up)
As you said, it crashes in libQtCore (somewhere, if only addr2line
worked properly)

Odd that the Windows version doesn't have the libQtCore crash...

I'll try to get it fixed, but r6 is a wise choice for now.