[Bug 1702917] Re: [Feature] P9: Power9 CPU tuned libraries

[Matthias Klose]

I'd like to see things done for the toolchain in 17.10 already, so that
this kind of stuff can be tested for the LTS.  It's another thing if we
can do it, not having p9 hardware...

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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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