Ubuntu
qt4-x11 package

  1. Bug #664431
  2. Comment #55

Comment 55 for bug 664431

Revision history for this message
Thiago Macieira (thiago-kde) wrote :

My recommendation (as upstream) is that you compile Qt with run-time-detected Neon support. That is, do not enable -mfpu=neon everywhere, but let Qt detect that the compiler supports this option and enable only for the *_neon.cpp files.

I knew that Qt had this supported at UDS, but what I didn't know was that it was broken. It wasn't runtime detection, it simply turned the option on for everything. Hence the SIGILL.

I opened a bug report and it was fixed: http://bugreports.qt.nokia.com/browse/QTBUG-15163

There's still something wrong in the detection machinery (task QTBUG-15150) which AFAIK doesn't affect the Ubuntu builds. The issue I know of is a false negative of Neon: it disables Neon even when the compiler supports. That's the MeeGo bug linked from QTBUG-15150.