Re: backward dependencies on libzfs

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On 04/27/15 17:57, Craig Rodrigues wrote:
> On Mon, Apr 27, 2015 at 1:17 AM, Andriy Gapon <avg_at_freebsd.org>
> wrote:
> 
>> 
>> I am not sure what's the best list to discuss this issue, so let
>> me raise it here.
>> 
>> It seems that libzfs_core can not be used without also linking /
>> loading libzfs: /lib/libzfs_core.so.2: Undefined symbol
>> "zcmd_ioctl_compat"
>> 
>> The same is true for libnvpair but for a different reason (and it
>> looks like mea culpa): /lib/libnvpair.so.2: Undefined symbol
>> "aok"
>> 
>> Both dependencies seem to be backward, because: $ ldd
>> /lib/libzfs.so.2 /lib/libzfs.so.2: libmd.so.6 => /lib/libmd.so.6
>> (0x801647000) libthr.so.3 => /lib/libthr.so.3 (0x801857000) 
>> libumem.so.2 => /lib/libumem.so.2 (0x801a7c000) libutil.so.9 =>
>> /lib/libutil.so.9 (0x801c7d000) libuutil.so.2 =>
>> /lib/libuutil.so.2 (0x801e8f000) libm.so.5 => /lib/libm.so.5
>> (0x802098000) *libnvpair.so.2 => /lib/libnvpair.so.2
>> (0x8022c1000)* libavl.so.2 => /lib/libavl.so.2 (0x8024d6000) 
>> libbsdxml.so.4 => /lib/libbsdxml.so.4 (0x8026d8000) libgeom.so.5
>> => /lib/libgeom.so.5 (0x8028ff000) *libzfs_core.so.2 =>
>> /lib/libzfs_core.so.2 (0x802b04000)* libc.so.7 => /lib/libc.so.7
>> (0x80081f000) libsbuf.so.6 => /lib/libsbuf.so.6 (0x802d08000)
>> 
>> So, there are circular dependencies between libzfs and the other
>> library in both cases. It seems that those dependencies do not
>> cause much, if any trouble, in practice, but they are not nice,
>> because they are unexpected and they are not present on other
>> OpenZFS platforms.
>> 
>> 
> Fixes similar to this: 
> https://svnweb.freebsd.org/changeset/base/272484
> 
> need to be done to plug these symbol dependency problems in the
> libraries.

Well I think it's different issue.  The backward dependency was
because of our libzfs_core depends on some compatibility shims (I
think it was introduced in r248445).  I don't have much time to work
on it right now though.

Andriy -- maybe file a bug and assign it to me?

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>    https://www.delphij.net/
FreeBSD - The Power to Serve!           Live free or die
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