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Bug#956418: src:glibc: Please provide optimized builds for ARMv8.1



* Noah Meyerhans:

> Gcc provides two ways to enable support for these instructions at build
> time.  The simplest, and least disruptive, is to enable -moutline-atomics
> globally in the arm64 glibc build.

Shouldn't GCC do this by default, at least for -mtune=generic?


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