[Interest] [Mingw-w64-public] Compiling Qt (4 or 5) with "-std=c++11"

[Ruben Van Boxem]

Op 21 mrt. 2013 22:31 schreef "K. Frank" <kfrank29.c at gmail.com> het
volgende:
>
> Hi Thiago!
>
> (I've taken the liberty of cross-posting this back to the mingw-w64-public
> list.)
>
> On Thu, Mar 21, 2013 at 5:07 PM, Thiago Macieira
> <thiago.macieira at intel.com> wrote:
> > On quinta-feira, 21 de março de 2013 16.52.29, K. Frank wrote:
> >> Hello Lists!
> >>
> >> Should I expect to be able to build Qt with "-std=c++11" using
mingw-w64?
> >
> > No. The Windows headers that are shipped with MinGW aren't standards-
> > compliant. You need to compile with -std=gnu++11.

I wonder what problems you've been running into... Although I haven't used
many windows headers directly, I guess the c++ standard lib and certainly
boost includes a lot of them and I haven't met any show stopping problems
with -std=c++11.

>
> Thank you.  I will bear that in mind.  I don't see any problem with that.
>
> > Qt automatically switches to that mode in the modules that require it.
> >
> >> As I understand it, using "-std=c++11" causes abi breakage, so to do
this, I
> >> will have to recompile the various libraries I use.
> >
> > Not with Qt. Qt has the very same ABI, whether you compile it with
C++11 or
> > C++98.
>
> I guess I should take your word for it.  But I'm a little confused, so
let me
> ask for some clarification.  How does Qt control the abi produced by the
> compiler?  I was under the distinct impression that "-std=???11" caused
> significant abi breakage, that this was recognized as an issue, but, I
> guess, that the gcc folks felt that it was worth it for some reason.
>
> How could Qt manage to dodge that bullet?  Or am I misunderstanding
> the issue?

Different ABI is only problematic if you pass e.g. std::string objects
across different module ABI boundaries. I suppose Qt avoids using the
standard library as it provides its own implementations of most if not all
standard library functionality.

Ruben

>
> >> Has anyone built Qt with either gcc 4.7 or 4.8 with "-std=c++11"
activated?
> >
> > I know someone has, since there have been fixes for MinGW and C++11
mode coming
> > in.
> >
> > I've been using C++11 and C++0x before that for a couple of years on
Linux.
> > Since GCC 4.4.
>
> Excellent.
>
> > Thiago Macieira - thiago.macieira (AT) intel.com
> >   Software Architect - Intel Open Source Technology Center
>
>
> Thank you for the reassurance.
>
>
> K. Frank
>
>
------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://p.sf.net/sfu/appdyn_d2d_mar
> _______________________________________________
> Mingw-w64-public mailing list
> Mingw-w64-public at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20130321/85d8ea85/attachment.html>