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

[Takahiro Hashimoto]

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)
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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