[Pkg-gmagick-im-team] Bug#587227: libmagick++3: ABI breakage without SONAME change (yet again)

[Bastien ROUCARIES]

On Mon, Jun 28, 2010 at 4:51 PM, Julien Cristau <jcristau at debian.org> wrote:
> On Mon, Jun 28, 2010 at 16:14:23 +0200, Bastien ROUCARIES wrote:
>
>> upstream does not seems how to use libtools in order to create a publi
>> private list of symbols using the procedure described in
>> http://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=12841
>>
> Oh and fwiw libtool does not create a list.  It takes a list (or regexp)
> and ensures that only the matching symbols are exported.  You can
> achieve the same with a linker script or adding visibility attributes in
> the source code.  But neither of those prevent ABI breakage if public
> functions or symbols change signature or are removed, which is what
> happened here.  The only way to prevent this is to either bump SONAME
> when that happens, or not do those changes in the first place.

yes but with a list of symbols publically exported we could use a
script to detect change between version, and ask to bump soname in
case of missmatch.

We used with kind of stuff a long time ago, but upstream does not
always bump soname saying it is a private symbols. We therefore ask to
only export public symbols and they do not know how to use libtool
facility. So if you post a patch, we could create a list and after a
few iteration only export abi stable symbols.

Bastien


> Cheers,
> Julien
>
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