[cfe-dev] Clang builds Qt

[Ted Kremenek]

Great news, Tor!  This is also a great baseline for further work (e.g., codegen quality) on the Clang side.

On Oct 29, 2010, at 4:02 AM, Tor Arne Vestbø wrote:

> Hey all,
> 
> I’m happy to report that as of Qt revision 15f52e00 and Clang revision 
> 116737 Qt builds with Clang on both Linux and Mac, including support for 
> precompiled headers.
> 
> You’ll find the makespecs in Qt’s master branch [1]:
> 
>   - unsupported/macx-clang
>   - unsupported/linux-clang
> 
> The mkspec is 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 [2].
> 
> 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 5% 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.
> 
> Thanks!
> 
> Tor Arne
> 
> [1] http://qt.gitorious.org/qt/qt/commits/master
> [2] http://labs.qt.nokia.com/2010/10/29/compiling-qt-with-clang/
> 
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