Repurposing this as a Feature Freeze request bug for the glibc update. The justification for POWER is laid out below but, obviously, 2.21->2.23 brings in a lot of random minor improvements and bugfixes for all architectures, and has been requested by several different contracts.
The plan is to get it into the archive Friday evening/night at the latest, watch all the automated testing, iterate through bugfixes as necessary, and see it ship in the final beta next week.
As for the GCC feature mentioned in the original bug report, that was fixed by wschmidt and doko a few hours ago to actually work in xenial.
[Original Report]
glibc-2.23 will introduce an important ABI change for Power. It will be a prerequisite for __builtin_cpu_is() and __builtin_cpu_supports() in gcc.
The __builtin_cpu_is () / __builtin_cpu_supports() are required to bring Power on-par with Intel regarding CPU and capability identification during runtime, allowing our customers to optimize their code path to the Power processor they are running on.
These gcc builtins will be disabled when the binary is built against a glibc older than 2.23, making glibc-2.23 a requirement for this feature to work.
This version of glibc will be released in early February/2016.
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