[Bug 1702917] Comment bridged from LTC Bugzilla

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------- Comment From tulioqm at br.ibm.com 2017-09-05 09:53 EDT-------
> As a general rule, I'd prefer not to have extra glibc builds.
>  ...
> (there was great rejoicing from my end when I
> killed libc6-i686, the last "tuned" build of glibc we had).

If this is a policy adopted by all architectures, there is no need to
create an exception for POWER.

However, I kindly ask Canonical to contact us if/when another
architecture starts having CPU-tuned libraries.

So, I'm changing the status of this feature request accordingly.

Thanks!

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https://bugs.launchpad.net/bugs/1702917

Title:
  [Feature] P9:  Power9 CPU tuned libraries

Status in The Ubuntu-power-systems project:
  New
Status in glibc package in Ubuntu:
  New

Bug description:
  glibc provides minimal support for POWER9 since version 2.23.
   glibc 2.25 is the first version to provide POWER9 optimizations via
   STT_GNU_IFUNC. The optimizations are enabled by default and will be disabled
   when using --disable-multi-arch (notice that multi-arch in glibc context is
   not the same thing as used by Debian).
   
   However, this feature request is proposing to provide a second glibc build,
   configured with --with-cpu=power9 and co-installed with the default glibc
   build, but under $(LIBDIR)/power9.
   Other distros usually install these under /lib64/power9.  Ubuntu may need to
   use a different directory due to supporting Debian's multiarch.
   
   The support for this is known to work upstream since glibc 2.23.
   So, I think this is just pending changes in the distro build system.

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