STINNER Victor <[email protected]> added the comment:
I search if C extensions of the Python standard libraries are always linked or
not to libpython... it's complicated. I tested _ctypes, _hashlib and _struct
modules:
* Debian and Ubuntu: NOT linked to libpython
* Conda: LINKED to libpython
* Mageia 7: LINKED to libpython
* Fedora 28, RHEL 7: LINKED to libpython on Python 2.7 and 3.6, except _struct
which is NOT linked to libpython on Python 2.7
It means that using dlopen("libpython2.7.so.1.0", RTLD_LOCAL | RTLD_NOW) may or
may not work depending on the Linux distribution and depending on the imported
C extensions...
If we use the example of Fedora: some C extensions are compiled using Makefile
(the Fedora package modifies Modules/Setup, as I showed previously), but others
are compiled by setup.py. For example, _ctypes and _hashlib are compiled by
setup.py.
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