osx - Dynamic symbol lookup fails with statically embedded Python on Mac OS X -

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i'm building mac os x application embed python. application technically bundle (i.e. main executable mh_bundle); it's plug-in application. i'd embed python statically, want able load extensions dynamically.

i did following: included whole library (-force_load path/to/libpython2.7.a), reexported python symbols (-exported_symbol_list path/to/list), , added -u _pymac_error, got using this linking advice. bundle loads fine, internal python code appears work, fails when it tries import dynamic library (time.so) following message:

traceback (most recent call last):   ... importerror: dlopen(/<stripped>/time.so, 2): symbol not found: _pyexc_overflowerror   referenced from: /<stripped>/time.so   expected in: dynamic lookup

this symbol part of python api , must in bundle already. can check this:

nm -g build/debug/pyfm | grep _pyexc_overflowerror 00172884 d _pyexc_overflowerror 0019cde0 d _pyexc_overflowerror

(it's listed twice because have 2 architectures, i386 , ppc).

the time.so doesn't reference anything, which, understand, design:

otool -l "/<stripped>/time.so" /<stripped>/time.so (architecture ppc): /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libsystem.b.dylib (compatibility version 1.0.0, current version 88.3.11) /<stripped>/time.so (architecture i386): /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libsystem.b.dylib (compatibility version 1.0.0, current version 88.3.11)

my problem appears similar this, it's other way round: link python statically, while other poster linked dynamically (an our platforms different too). him static linking solved problem.

why doesn't find symbol?

update. suspect happens because main app loads plug-ins (and bundle) rtld_local.

the “update” made suggests right: main plug-in bundle loaded locally (rtld_local), nobody can see symbols there, unless using explicit dlopen followed dlsym.

if linux promote bundle global namespace dlopening again rtld_global flag, under mac os x doesn't work. mac os x nicely packs stuff bundles, made dynamic library , put plug-in bundle directory. library loads automatically rtld_global , python symbols available.


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