From: Justin Forbes on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1144#note_5959...
glibc 2.34 will detect `-march=z14` and refuse to run on z13 or
earlier, to
avoid hard-to-diagnose crashes later. We learned the hard way that this
very
desirable during the ppc64le bringup.
Would it still detect this if the kernel running in the build root is a z13
kernel? There are kernel advantages to limiting supported hardware, but z13
added the vector bits, I don't recall z14 adding much instruction wise, so
perhaps there is no benefit to building userspace with z14?