On PowerPC, `configure` script fails with `Flag -march=native failed!` error

[iamazeem]

Not sure if PowerPC is the supported target.
Encountered this error while working on RPM packaging.
Thought it should be documented for future reference even if it's not supported.

Error:

checking whether compiler accepts -march=native... no
Flag -march=native failed!

Build: https://koji.fedoraproject.org/koji/taskinfo?taskID=138829209
Logs: https://kojipkgs.fedoraproject.org//work/tasks/9209/138829209/build.log

According to mfem/mfem#216 (comment), the flags should be:

-mcpu=native -mtune=native

Related:

• https://maskray.me/blog/2022-08-28-march-mcpu-mtune

---

PS

To support PowerPC, the following would be worth looking into:

• https://github.com/google/cpu_features
• https://github.com/google/highway