Xen 4.2 / Xen 4.3 ABI compatibility

Xen 4.2 / Xen 4.3 ABI compatibility

[Alex Bligh]

Is there meant to be sufficient ABI compatibility between 4.2 and 4.3
that a program compiled and linked against 4.2 will run with 4.3's
dynamic libraries?

If the answer to this is 'yes', I think I may have some bugs to report.

-- 
Alex Bligh

Re: Xen 4.2 / Xen 4.3 ABI compatibility

[Roger Pau Monné]

On 18/05/13 12:11, Alex Bligh wrote:
> Is there meant to be sufficient ABI compatibility between 4.2 and 4.3
> that a program compiled and linked against 4.2 will run with 4.3's
> dynamic libraries?
> 
> If the answer to this is 'yes', I think I may have some bugs to report.

If you are asking about libxl, it is not ABI compatible, only API. You
should recompile your programs when updating.

Re: Xen 4.2 / Xen 4.3 ABI compatibility

[Alex Bligh]

--On 18 May 2013 12:15:58 +0200 Roger Pau Monné <roger.pau@citrix.com> 
wrote:

>> If the answer to this is 'yes', I think I may have some bugs to report.
>
> If you are asking about libxl, it is not ABI compatible, only API. You
> should recompile your programs when updating.

libxl and the other libraries. I will recompile and see what happens :-)

-- 
Alex Bligh

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Re: Xen 4.2 / Xen 4.3 ABI compatibility

[Ian Campbell]

On Sat, 2013-05-18 at 11:31 +0100, Alex Bligh wrote:
> 
> --On 18 May 2013 12:15:58 +0200 Roger Pau Monné <roger.pau@citrix.com> 
> wrote:
> 
> >> If the answer to this is 'yes', I think I may have some bugs to report.
> >
> > If you are asking about libxl, it is not ABI compatible, only API. You
> > should recompile your programs when updating.
> 
> libxl and the other libraries. I will recompile and see what happens :-)

Where the ABI has changed between 4.2 and 4.3 the SONAMEs should also
have been bumped. The last missing bumps should have been caught by:
        commit dac66a5b2db37a40c7eb4b9d25ee8095106906c0
        Author: Ian Jackson <ian.jackson@eu.citrix.com>
        Date:   Tue May 7 11:39:10 2013 +0100
        
            tools: Bump some library sonames
        
Please let us know if we missed one.

We don't (usually) bump the SONAME more than once during a dev cycle so
if the ABI changed more than one things built against intermediate
versions may not work and would need rebuilding.

If you haven't recompiled then you may also be picking up the 4.2
SONAMEs (i.e. the 4.2 versions of the libraries), which wouldn't be
expected to work with 4.3.

Ian.

Re: Xen 4.2 / Xen 4.3 ABI compatibility

[Alex Bligh]

Ian,

--On 18 May 2013 11:57:16 +0100 Ian Campbell <Ian.Campbell@citrix.com> 
wrote:

> Where the ABI has changed between 4.2 and 4.3 the SONAMEs should also
> have been bumped. The last missing bumps should have been caught by:
>         commit dac66a5b2db37a40c7eb4b9d25ee8095106906c0
>         Author: Ian Jackson <ian.jackson@eu.citrix.com>
>         Date:   Tue May 7 11:39:10 2013 +0100
>
>             tools: Bump some library sonames
>
> Please let us know if we missed one.
>
> We don't (usually) bump the SONAME more than once during a dev cycle so
> if the ABI changed more than one things built against intermediate
> versions may not work and would need rebuilding.
>
> If you haven't recompiled then you may also be picking up the 4.2
> SONAMEs (i.e. the 4.2 versions of the libraries), which wouldn't be
> expected to work with 4.3.

Some good news for once - I can confirm our app compiles without a single
warning against 4.3-rc2. We'll try some unit tests next week.

-- 
Alex Bligh