Ronald Oussoren added the comment:

Note that the OSX port already does this for framework builds. I don't know why 
we don't use the same code for shared library builds.

Issue #15498 contains a patch that switches this code from a deprecated 
nextstep-era API to dladdr.

Two comments on the patch attached to this issue:

1) The name "_PyImport_GetModulePath" is confusing, I'd use 
_PyImport_GetSharedLibPath to make clear that this is locating the shared 
library.

2) The code calls dladdr on a static variable that's introduced just for that, 
it is also possible to call dladdr on an already existing symbol (for example 
the address of a function in the public API).

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nosy: +ronaldoussoren

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<http://bugs.python.org/issue18309>
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