How to write a platform-independent CMake install command
to install a Swig-generated Python module?
The following brings us very close to a solution:
```
execute_process(
COMMAND "${Python3_EXECUTABLE}"
-c "from distutils import sysconfig as sc;
print(sc.get_python_lib(prefix='', plat_specific=True))"
OUTPUT_VARIABLE PYTHON_SITE
OUTPUT_STRIP_TRAILING_WHITESPACE)
message(STATUS "Python module libcerf will be installed to ${PYTHON_SITE}")
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/<our_module>.py
DESTINATION ${PYTHON_SITE})
```
So far, we only tested under Debain, where the problem arises:
- distutils.sysconfig.get_python_lib(...) returns lib/python3/dist-packages
- CMake provides CMAKE_INSTALL_PREFIX=/usr/local/
- So installation goes to /usr/local/lib/python3/dist-packages
- sys.path, however, does not contain /usr/local/lib/python3/dist-packages.
sys.path contains /usr/local/lib/python3.9/dist-packages, and also
/usr/lib/python3/dist-packages, so this is slightly incoherent.
Anyway, we won't want to change sys.path. So we need to change
the above CMake/Python code to return a local installation directory
that is part of sys.path.
Thanks for any hints - Joachim
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