>>>>> "GW" == Greg Wilson <Greg.Wilson@baltimore.com> writes:
GW> I'm working on Solaris, and have configured Python using
GW> --with-cxx=g++. I have a library "libenf.a", which depends on
GW> several .so's (Eric Young's libeay and a couple of others). I
GW> can't modify the library, but I'd like to wrap it so that our
GW> QA group can write scripts to test it.
GW> My C module was pretty simple to put together. However, when
GW> I load it, Python (or someone) complains that the symbols that
GW> I know are in "libeay.so" are missing. It's on
GW> LD_LIBRARY_PATH, and "nm" shows that the symbols really are
GW> there. So:
| 1. Do I have to do something special to allow Python to load
| .so's that extensions depend on? If so, what?
Greg, it's been a while since I've worked on Solaris, but here's what
I remember. This is all circa Solaris 2.5/2.6.
LD_LIBRARY_PATH only helps the linker find dynamic libraries at
compile/link time. It's equivalent to the compiler's -L option. It
does /not/ help the dynamic linker (ld.so) find your libraries at
run-time. For that, you need LD_RUN_PATH or the -R option. I'm of
the opinion that if you are specifying -L to the compiler, you should
always also specify -R, and that using -L/-R is always better than
LD_LIBRARY_PATH/LD_RUN_PATH (because the former is done by the person
doing the install and the latter is a burden imposed on all your
users).
There's an easy way to tell if your .so's are going to give you
problems. Run `ldd mymodule.so' and see what the linker shows for the
dependencies. If ldd can't find a dependency, it'll tell you,
otherwise, it show you the path to the dependent .so files. If ldd
has a problem, you'll have a problem when you try to import it.
IIRC, distutils had a problem in this regard a while back, but these
days it seems to Just Work for me on Linux. However, Linux is
slightly different in that there's a file /etc/ld.so.conf that you can
use to specify additional directories for ld.so to search at run-time,
so it can be fixed "after the fact".
GW> Instead of offering a beer for the first correct answer this
GW> time, I promise to write it up and send it to Fred Drake for
GW> inclusion in the 2.1 release notes :-).
Oh no you don't! You don't get off that easily. See you next
week. :)
-Barry
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