[Development] qtdeclarative-5.6.0-beta build failure on rhel6

[Sarajärvi Tony]

> -----Original Message-----
> From: Development [mailto:development-bounces at qt-project.org] On
> Behalf Of Takahiro Hashimoto
> Sent: 19. tammikuuta 2016 12:36
> To: development at qt-project.org
> Cc: Rex Dieter <rdieter at math.unl.edu>
> Subject: Re: [Development] qtdeclarative-5.6.0-beta build failure on rhel6
> 
> Hi.
> 
> Sorry I don't have any info about C++11 code in 5.6 branch. I'd like to
> comment for Simon's question about devltoolset requirement.
> 
> According to this thread [1] maybe the binary distribution of Qt 5 requires
> newer(4.7?) libstdc++ than the one which is provided by RHEL/CentOS
> 6.(4.4.7)

Yes that and also GCC gets updated when we install devtoolset.

> This might lead updating wiki article of building qt5 to add this workaround.
> 
> The Red Hat Developer Toolset has been released 4 times for RHEL5/6
> release
> (1.0 to 3.0) and currently only 3.0 is supported on RHEL6. [2]
> 
> I think These are reason why for this requirement.
> And I don't know if the older version of Qt5(5.0,5.1..) could be built with
> gcc 4.4...
> 
> By the way, RHEL6 is now at second half of its 10 years support life cycle.
> [3] I think it would be better to start to consider about Qt5 support for
> RHEL7.  As RHEL7 has gcc 4.8, the devtoolset is not needed.
> 
> 
> [1] http://forum.qt.io/topic/30140/solved-qt-creator-could-not-find-or-load-
> the-qt-platform-plugin-xcb/
> 
> [2] https://access.redhat.com/support/policy/updates/dts
> [3] https://access.redhat.com/support/policy/updates/errata
> 
> 
> Regards.
> Takahiro
> 
> 
> On 2016年1月18日月曜日 15時58分09秒 JST Hausmann Simon wrote:
> > I'm surprised as well that this slipped through. Looks like MSVC 2010
> > supports this bit as well.
> >
> > It is true however that we require devtoolset 3 for RHEL 6. Does anyone
> > remember the reason?
> >
> >
> > Simon
> >
> >   Original Message
> > From: Olivier Goffart
> > Sent: Monday, January 18, 2016 16:26
> > To: development at qt-project.org
> > Cc: Rex Dieter
> > Subject: Re: [Development] qtdeclarative-5.6.0-beta build failure on rhel6
> >
> > On Montag, 18. Januar 2016 08:31:01 CET Rex Dieter wrote:
> > > I'm trying to build(bootstrap) qt-5.6.0-beta stack on rhel6, and have run
> > > into a build failure in qtdeclarative,
> >
> > <snip>
> >
> > > beta/tools/qmlimportscanner/main.cpp:376: error: no matching function
> for
> > > call to 'find_if(QList<QFileInfo>::const_iterator,
> >
> > std::find_if is new in C++11
> > And it was used in https://codereview.qt-project.org/125853/ in the 5.6
> > which still does not require C++11.
> >
> > Apparently the CI does not try to build this with non-c++11 enabled
> > compilers?
> >
> > --
> > Olivier
> >
> > Woboq - Qt services and support - https://woboq.com -
> https://code.woboq.org
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