Re: [PATCH 0/3] target: RFC: display deprecation note for '-cpu help'

[Cornelia Huck <cohuck@redhat.com>]

On Mon, Jul 18 2022, Thomas Huth <thuth@redhat.com> wrote:

> On 14/07/2022 17.07, Daniel P. Berrangé wrote:
>> $ qemu-system-x86_64 -cpu help:
>> Available CPUs:
>> x86 486                   (alias configured by machine type) (deprecated: use at least 'Nehalem' / 'Opteron_G4', or 'host' / 'max')
>> 
>> I wonder if this is too verbose, and we should just do a
>> concise flag like approach, similar to QMP:
>> 
>> $ qemu-system-x86_64 -cpu help:
>> Available CPUs:
>> x86 486                   (alias configured by machine type) (deprecated)
>> 
>> leaving the full message to be displayed at runtime ? I'm slightly
>> inclined to the simpler more concise output.
>
> I'd prefer to keep it short here and just write "deprecated" without the 
> reason. Otherwise this will overflow the lines and break the readability of 
> the output. And it's also what we're also doing for "-machine", e.g.:
>
> $ ./qemu-system-ppc64 -M help | grep deprecate
> taihu                taihu (deprecated)
> $ ./qemu-system-ppc64 -M taihu
> qemu-system-ppc64: warning: Machine type 'taihu' is deprecated: incomplete, 
> use 'ref405ep' instead

Ok, following what -machine does is certainly a good point.

Is it easy enough the figure out the deprecation note? I think you
either have to actually start something with the deprecated entity, or
use qmp (which is not that straightforward)?