Unable to cross compile due to cffi

[pyca]

Unable to cross compile due to cffi

[dstufft]

Hmm... So this looks like it might actually be a problem with CFFI itself. The error that's occuring now is that it can't import the _cffi_backend from the installed library. What happens if you install cffi before running the build for bcrypt?

[Diaoul]

Exactly the same as pyca/pyopenssl#157 read my comments in that issue.
The problem is that bcrypt tries to import itself during setup.py to trigger cffi compilation, even with cffi installed on the host and cross-compilation going well it will ultimately fail when it tries to import the cross-compiled binary on the host.

[Diaoul]

This is since 1.1.0, 1.0.2 was fine.

[dstufft]

Well bcrypt has always imported itself during setup.py, it's just previously there was two compilations, one was implicit that compiled on import, and one was explicit that compiled as part of the setup.py build_ext run. bcrypt 1.1.0 is very careful not to call _load_library during the invocation of setup.py. In fact this is failing before that is even taking place since it's failing at _ffi = FFI() which is occurring before anything bcrypt specific.

Is there a set of commands I can use to reproduce this on either an OS X box or some kind of Linux box?

[Diaoul]

Importing occurs on the host where cffi isn't installed. I installed it and now it seems to work. I'll try to import it on target and keep you posted.

[Diaoul]

It seems to work with cffi installed on the host. I can import bcrypt on the target. I don't know if the C extension is loaded properly though, I'll reopen if I have any problem.

I'm sceptical about the module trying to import itself during setup. Setup is about setting up things before you use it. In bcrypt's case that's almost OK because you don't have a lot of dependencies but still, that doesn't seem right.