On 23/04/2021 08.52, Christian Borntraeger wrote:
[...]
We can of course discuss if we compile the BIOS for z10 instead of z900. TCG
in the mean time can handle up to z13 and z10 is now also 13 years old.
I'd really like to see us supporting Clang in the s390-ccw bios, too, since it
provides additional useful compiler warnings ... but switching the -mz900 to
-mz10 here also means that we could not boot VMs anymore that use a CPU that is
older than the z10...
Is anybody still using such old CPUs? Should we maybe deprecate all CPUs that
are older than the z10 in QEMU? Alternatively, we could try to detect Clang in
the Makefile, and only use -mz10 in that case and continue to use -mz900 in the
other case...?