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Our adoption of C++11 (and C++14 features) is held back by the very minimal (and occasionally incorrect) support for C++11 in gcc 4.4.
Major long-term-support Linux distributions that ship with gcc 4.8 have now been out for about a year now (including RHEL/CentOS 7 and Ubuntu 14.04), so it may now be reasonable to expect users currently relying on gcc 4.4 to either upgrade their OS or bear the burden of installing a newer compiler.
We could also consider providing eups distrib packages with newer compiler versions for those who need them (we do this on the HSC side).
In any case, I don't think we can simply wait for OSes that ship gcc 4.4 to go away on their own; the lifespans of those distributions are simply too long. But if certain important users are already scheduled to upgrade in the near future anyway, it may be prudent to just wait for that ourselves.