[Development] Qt 4.8 clang and libc++

[Olivier Goffart]

On Monday 03 September 2012 00:13:50 Thiago Macieira wrote:
> On segunda-feira, 3 de setembro de 2012 00.02.09, Olivier Goffart wrote:
> > On Sunday 02 September 2012 22:43:33 Laszlo Papp wrote:
> > > > It would be nice to have clang in the CI system.
> > > 
> > > I had the impression, clang is already in there:
> > > http://testresults.qt-project.org/ci/QtBase_master_Integration/latest-su
> > > cc
> > > es s/ http://qt-project.org/wiki/CI_Configurations
> > > 
> > > Laszlo
> > 
> > Ah, right.
> > There seems to be something wrong in the C++11 detection.
> > In the log it says:
> > 9/2/12 6:59:04 PM EST: C++11 support .......... no
> 
> No, there's nothing wrong. It's working perfectly.
> 
> #include <utility>
> #if defined(__clang__) && !defined(_LIBCPP_VERSION)
> #  error "C++11 with clang requires libc++ runtime"
> #endif

But why do we require libc++?  What's wrong with using the standard library 
from recent GCC?
The way to do the detection should be to include the relevant standard headers 
and check they compile fine. 

Else, libc++ should probably be installed on the CI machines.

-- 
Olivier

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