Re: C++11, std::list::size(), and trusty

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On Tue, 5 Dec 2017, kefu chai wrote:
> On Thu, Nov 30, 2017 at 10:38 PM, Sage Weil <sweil@xxxxxxxxxx> wrote:
> > On Thu, 30 Nov 2017, Nathan Cutler wrote:
> >> I thought we already agreed to drop Trusty in Mimic?
> >
> > I'm not sure we made any final decision, but I haven't seen anyone
> > complain this time around, so I'd say let's do it!
> 
> good news, every one! we are now building ceph using gcc-7 on centos7
> and trusty.
> 
> an example build with gcc-4.8 on trusty:
> https://jenkins.ceph.com/job/ceph-dev-build/ARCH=x86_64,AVAILABLE_ARCH=x86_64,AVAILABLE_DIST=trusty,DIST=trusty,MACHINE_SIZE=huge/13152//consoleFull
> /// we have following warning message:
> ----8<----
> CMake Warning at src/CMakeLists.txt:176 (message):
>   performance regression is expected due to an O(n) implementation of
>   'std::list::size()' in libstdc++ older than 5.1.0
> ------>8----
> an example build with gcc-7 on trusty:
> see https://jenkins.ceph.com/job/ceph-dev-build/ARCH=x86_64,AVAILABLE_ARCH=x86_64,AVAILABLE_DIST=trusty,DIST=trusty,MACHINE_SIZE=huge/13156//consoleFull
> /// the warning message is gone.
>
> a build with gcc-7 on centos-7,
> see https://jenkins.ceph.com/job/ceph-dev-build/ARCH=x86_64,AVAILABLE_ARCH=x86_64,AVAILABLE_DIST=centos7,DIST=centos7,MACHINE_SIZE=huge/13155//consoleFull

Yay!!

> once all trusty testnodes are re-imaged with xenial, i will try to
> remove the trusty build support on ceph/ceph-build. BTW, if we want to
> use gcc-7 on xenial, which ships GCC 5.3, we can apply the same fix on
> it also.

I think we need to keep the trusty build support there for luminous and 
jewel builds, right?

> the only issue is http://tracker.ceph.com/issues/22301. its fix is
> pending on review.
> 
> -- 
> Regards
> Kefu Chai
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