[oi-dev] libxml2 mapfile and symbol removal

[Andreas Wacknitz]

Hi Tim,

Am 11/14/21 um 05:25 schrieb Tim Mooney via oi-dev:
>
> All-
>
> I'm investigating how difficult it might be to update libxml2 and libxslt
> to current latest versions.
>
> Unfortunately, libxml2 removed a bunch of formerly public symbols at
> version 2.9.10:
>
>     # emptyExp; removed in 2.9.10
>     # forbiddenExp; removed in 2.9.10
>     # xmlExpCtxtNbCons; removed in 2.9.10
>     # xmlExpCtxtNbNodes; removed in 2.9.10
>     # xmlExpDump; removed in 2.9.10
>     # xmlExpExpDerive; removed in 2.9.10
>     # xmlExpFreeCtxt; removed in 2.9.10
>     # xmlExpFree; removed in 2.9.10
>     # xmlExpGetLanguage; removed in 2.9.10
>     # xmlExpGetStart; removed in 2.9.10
>     # xmlExpIsNillable; removed in 2.9.10
>     # xmlExpMaxToken; removed in 2.9.10
>     # xmlExpNewAtom; removed in 2.9.10
>     # xmlExpNewCtxt; removed in 2.9.10
>     # xmlExpNewOr; removed in 2.9.10
>     # xmlExpNewRange; removed in 2.9.10
>     # xmlExpNewSeq; removed in 2.9.10
>     # xmlExpParse; removed in 2.9.10
>     # xmlExpRef; removed in 2.9.10
>     # xmlExpStringDerive; removed in 2.9.10
>     # xmlExpSubsume; removed in 2.9.10
>
> At a minimum, that likely means that nearly everything that depends
> upon libxml2 will need a rebuild.
Yes, if we are lucky all the existing packages will build with the newer
versions. But in our world you should expect breakages.
We have similar situations with other libraries, too. In my experience
you'll need to start the endeavor and find out what really breaks.
With that information we can decide whether it's worth to update. You'll
need to be prepared that it might take some time and efforts, though.

>
> My question is about what should be done to the mapfile we use with
> libxml2.  Most of these symbols are marked "global" at
>
>     SYMBOL_VERSION SUNW_1.6 {
>
> Do I just comment them out of that block, or is there some other better
> way to handle these now-removed symbols?

Sorry, I am not experienced enough to answer this question. The Solaris
"Linker and Libraries Guide" might have an answer for you.

Andreas