ModuleNotFoundError: No module named '_ctypes'

[nemith]

It seems like python may not be compiled with libffi which causes some simple libraries like psutil to fail.

Maybe it's possible to add libffi in as a dependency?

        File "/nix/store/sv2q89gvjq2h05q5qa48k1vw8j33kr0a-python3-3.7.9/lib/python3.7/ctypes/__init__.py", line 7, in <module>
          from _ctypes import Union, Structure, Array
      ModuleNotFoundError: No module named '_ctypes'

Using python 3.7.9

[nemith]

python-build-out.txt

Looks like it could be a MacOSX issue.

python3> fatal error: too many errors emitted, stopping now [-ferror-limit=]
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/_ctypes.c:107:
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:65:3: error: "Unsupported MacOS X CPU type"
python3>    65 | #       error "Unsupported MacOS X CPU type"
python3>       |         ^
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/_ctypes.c:107:
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:73:
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffitarget.h:12:2: error: "Unsupported CPU type"
python3>    12 | #error "Unsupported CPU type"
python3>       |  ^
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/_ctypes.c:107:
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:74:
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/fficonfig.h:51:2: error: "Unknown CPU type"
python3>    51 | #error "Unknown CPU type"
python3>       |  ^
python3> Creating directory /nix/store/ggqk0ckdjj7hhr9qk6y4g2zxzfa0mh29-python3-3.7.9/lib/python3.7/test/test_importlib/namespace_pkgs/not_a_namespace_pkg/foo
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/_ctypes.c:107:
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:171:5: error: unknown type name 'ffi_abi'
python3>   171 |                                 ffi_abi         abi;
python3>       |                                 ^
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:193:2: error: unknown type name 'ffi_sarg'
python3>   193 |         ffi_sarg        sint;
python3>       |         ^
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:194:2: error: unknown type name 'ffi_arg'
python3>   194 |         ffi_arg         uint;
python3>       |         ^
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/libffi_osx/include/ffi.h:307:11: error: unknown type name 'ffi_abi'
python3>   307 |                                                                                 ffi_abi                 abi,
python3>       |                                                                                 ^
python3> 1 error generated.
python3> In file included from /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/_ctypes.c:117:
python3> /nix/var/nix/builds/nix-build-python3-3.7.9.drv-0/b/Python-3.7.9/Modules/_ctypes/ctypes.h:59:5: error: unknown type name 'ffi_closure'
python3>    59 |     ffi_closure *pcl_write; /* the C callable, writeable */
python3>       |     ^
....
....
...
python3> Python build finished successfully!
python3> The necessary bits to build these optional modules were not found:
python3> _uuid                 nis                   ossaudiodev
python3> spwd
python3> To find the necessary bits, look in setup.py in detect_modules() for the module's name.
python3> The following modules found by detect_modules() in setup.py, have been
python3> built by the Makefile instead, as configured by the Setup files:
python3> _abc                  atexit                pwd
python3> time
python3> Failed to build these modules:
python3> _ctypes               _decimal              _tkinter

[nemith]

Looks like python-build has a patch for this. Would it be possible to apply this?

https://github.com/pyenv/pyenv/blob/master/plugins/python-build/share/python-build/patches/3.7.17/Python-3.7.17/0001-Port-ctypes-and-system-libffi-patches-for-arm64-macO.patch

[domenkozar]

Yes, please open a PR :)