You'll find the makespecs in Qt's master branch:
The mkspec are currently unsupported, but we've started running a few configurations with Clang in our internal CI system to catch build regressions.
Numbers-wise (*) we're seeing faster build times on Mac, 1.39x and 1.69x for debug and release respectively. On Linux debug builds are a bit slower, 0.99x as fast, but release builds are 1.23x faster.
Binary size is also reduced on Mac, 13% for debug and 5% for release, but on Linux the binaries grow an average of 117% in debug, and 5% in release. Performance is still under investigation, but initial results seem to indicate a 6% slowdown on Mac and a 16% slowdown on Linux.
We're seeing a handful of regressions in the unit-test suite, most notably
QMutex::tryLock(), but these will be investigated further.
Try it out and let us know of any issues!
* All numbers agains GCC 4.2.1 on Mac and GCC 4.4.3 on Linux
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