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Re: Compiling the s390-ccw bios with clang

From: Christian Borntraeger
Subject: Re: Compiling the s390-ccw bios with clang
Date: Fri, 23 Apr 2021 10:05:20 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1

On 23.04.21 09:57, Thomas Huth wrote:
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...?

If we can make it "non-ugly" this is certainly the most unproblematic variant.

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