libarchive, lzma, and xz interaction

[Kevin Oberman]

On Fri, Jul 1, 2011 at 7:19 PM, Kevin Oberman <kob6558 at gmail.com> wrote:
> I'm trying to understand the problems I am having on some systems
> regarding libarchive, lzma, and xz.
> I have an 8-Stable system updated yesterday. As far as I can tell,
> libarchive does include the lzma stuff
> from libzma. At least I see the references. But several ports seem to
> still pull in xz-5.0.1 and link to it.
> This has a wonderful potential to cause library symbol conflicts. I get:
> /usr/lib/libarchive.so: undefined reference to `lzma_stream_encoder at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_alone_decoder at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_memusage at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_stream_decoder at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_code at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_end at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_lzma_preset at XZ_5.0'
> /usr/lib/libarchive.so: undefined reference to `lzma_alone_encoder at XZ_5.0'
>
> ldd shows libarchive linked against liblzma.so.5 and an objdump of the
> dynamic symbols from liblzma.so.5
> shows the "undefined symbols" defined with the XZ_5.0 version, so I am
> mystified. It looks o me like it is
> there. Is confusion with xz-5.0.1 causing this? Should get rid of it?
> Even so, I don't understand why the
> loader is claiming that these symbols are undefined when they seem to
> be defined as far as I can tell.
> 0000000000007c60 g    DF .text  0000000000000084  XZ_5.0
> lzma_stream_encoder
>
> Any clues to what i happening would be greatly appreciated!

Replying to myself, I re-built all programs that depended on xz and
then deleted the port. Now everything works fine. I still don't
completely understand what I was seeing, but it is working, now.
-- 
R. Kevin Oberman, Network Engineer - Retired
E-mail: kob6558 at gmail.com