[oclug] library dependancy

[Gilles J. Seguin]

Bob Lockie wrote:
> 
> How can I tell what other libraries a library is dependant on?
> I'm getting a relocation error, undefined symbol for libxslt and grep
> say that function (xmlXPthOrderDocElems) is there so I figure it is some
> dependant library that is missing.

$ readelf -d /usr/lib/libxslt.so.1.0.30
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: [libxml2.so.2]
 0x00000001 (NEEDED)                     Shared library: [libz.so.1]
 0x00000001 (NEEDED)                     Shared library: [libpthread.so.0]
 0x00000001 (NEEDED)                     Shared library: [libm.so.6]
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]
since no RPATH, default path is used

$ cat libxslt.la | grep depend
# Libraries that this one depends upon.
dependency_libs=' -L/usr/lib /usr/lib/libxml2.la -lz -lpthread -lm'

$ ldd /usr/lib/libxslt.so.1.0.30

$ objdump -T libxml2.so.2.5.7 | grep xmlXPth
nothing
$ objdump -T libxslt.so | grep xmlXPth
nothing