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Re: [Qemu-devel] [PATCH] configure: Warn about deprecated hosts

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH] configure: Warn about deprecated hosts
Date: Sat, 18 Mar 2017 09:15:50 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 03/17/2017 09:52 PM, Peter Maydell wrote:
On 17 March 2017 at 11:49, Daniel P. Berrange <address@hidden> wrote:
On Fri, Mar 17, 2017 at 11:08:22AM +0000, Peter Maydell wrote:
We plan to drop support in a future QEMU release for host OSes
and host architectures for which we have no test machine where
we can build and run tests. For the 2.9 release, make configure
print a warning if it is run on such a host, so that the user
has some warning of the plans and can volunteer to help us
maintain the port if they need it to continue to function.

This commit flags up as deprecated the CPU architectures:
 * ia64
 * sparc
 * anything which we don't have a TCG port for
   (and which was presumably using TCI)

This seems to imply that if we remove supported for these architectures,
then TCI is no longer required either, or would there be other reasons
to want to keep TCI around, even when all host archs have a TCG port ?

I've never really seen the point in TCI, but others do, which
is why it's in the tree.

I don't see the point in TCI, because it's known to not work for any host that has non-trivial calling conventions.

You may recall I once did a re-write that did use libffi to overcome that problem. However, you rightly pointed out at the time that it's just as easy to write a proper host backend if one actually cares.


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