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Shared library & install names

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Shared library & install names

Subject: Shared library & install names
From: Ryan Govostes <email@hidden>
Date: Fri, 26 Dec 2008 20:31:56 -0500

Hi list,

I'm packaging up a Python .egg for distribution. The Python code calls functions in a shared library, which in turn imports from libxml2. I need a newer version of libxml2 than what ships with OS X, so I've built my own, and want to add this to the .egg.

However, I'm having a hard time figuring out the install names for the shared library (shared.so) and my custom built libxml2.dylib. For instance, I tried setting the install path of libxml2 to @loader_path/../libxml2.dylib as follows:

~/.python-eggs/pystuff.egg-tmp/pystuff/shared.so: @loader_path/../libxml2.dylib (compatibility version 10.0.0, current version 10.2.0) /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 117.0.0) /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

/~.python-eggs/pystuff.egg-tmp/pystuff/libxml2.dylib: @loader_path/../libxml2.dylib (compatibility version 10.0.0, current version 10.2.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 117.0.0) /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3) /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0) /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

However, DYLD_PRINT_LIBRARIES reveals it's loading /usr/lib/ libxml2.2.dylib despite my intentions:

dyld: loaded: ~/.python-eggs/pystuff.egg-tmp/pystuff/shared.so
dyld: loaded: /usr/lib/libxml2.2.dylib

This suggests to me that it's not "finding" my libxml2 despite being in the same directory as shared.so. I take it that I misunderstood what I've read about install names. What should I look into doing?

Regards,
Ryan Govostes
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