Hi Tim!
On Sun, 14 Nov 2021 15:12:52 -0600 (CST)
Tim Mooney via xml <xml@gnome.org> wrote:
> Hi!
>
> This is my first post to the xml mailing list. I spent some time looking
> through the mailing list archives, but couldn't find an answer to my
> question. If I somehow missed relevant discussion, please point me at
> it.
>
> When libxml2 2.9.10 was released, a number of formerly-public symbols
> were removed from the shared library. On the surface, that seems like
> it would be an ABI break, which might suggest a change in the SONAME of
> the library (such as a version bump from .2 to .3). That didn't happen,
> though.
>
Reading the code, I see:
```
if test "$with_regexps" = "no" ; then
echo Disabling Regexps support
WITH_REGEXPS=0
TEST_REGEXPS=
else
WITH_REGEXPS=1
TEST_REGEXPS="Regexptests Automatatests"
fi
AC_SUBST(WITH_REGEXPS)
AC_SUBST(TEST_REGEXPS)
```
Did you try --with-regexps?
> I see from libxml2's "syms" file the comment that the soname never
> changes, but it's not clear to me how the symbol versioning helps with
> ABI compatibility when symbols are removed.
>
> For example, if I compile a binary and link it against the 2.9.7+patches
> libxml2 on Red Hat Enterprise Linux 8, and then copy that binary to a
> RHEL 9 beta system, which will presumably include 2.9.12, won't that
> binary execute for a while but then crash if it tries to access one of
> the removed xmlExp* symbols?
>
> I'm asking mainly because I'm one of the volunteers that contributes
> package updates to OpenIndiana, one of the Illumos distros that came out
> of the former OpenSolaris project. We're currently shipping libxml2 2.9.9
> with a bunch of patches, but we would like to update to current. The
> ABI change has me wondering how involved that process is going to be.
>
> Thanks!
>
> PS: All of the removed symbols and interfaces are still documented on your
> web site, with no mention of deprecation or removal.
>
> Tim
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