Failed to compile under pypy2-v6.0.0-linux64

[ddorian]

Hi,

This module is installed by https://github.com/snipsco/snips-nlu-utils. On cpython it works fine, but on pypy I get a an error message of "Could not compile cpython".

More details from verbose output here snipsco/snips-nlu-utils#46 (comment)

regards,
ddorian

[ssokolow]

rust-cpython is a set of bindings for the libpython... included with CPython and explicitly doesn't list any PyPy versions as supported.

That said, given that PyPy does have CPyExt for supporting modules using the CPython API, it's entirely possible that it could be supported if someone's willing to donate the effort to make it work.

(As much as I'd love my rust-cpython projects to be able to support PyPy, I don't trust myself to write unsafe code.)

[dgrunwald]

python27-sys is essentially all the Python C headers converted to Rust (including struct and macro definitions). Unless pypy is binary compatible with cpython, it won't work. I never looking at PyPy in detail but I was under the impression that it provides its own headers that are more-of-less source-compatible with Python.h, but result in a different ABI.
So what's likely needed here is that someone writes a cpyext-sys crate for linking Rust code against pypy; and then rust-cpython could use that instead of python27-sys.

[dgrunwald]

By the way, the particular problem in your log is even earlier: the python27-sys build.rs script fails determining whether your python interpreter has threading support; so python27-sys is compiled without threading support; but rust-cpython requires threading support.

[markbt]

PyPy is explicitly out of scope, we're focused on the CPython implementation.