"'pybind11/pybind11.h' file not found" with PyPy (and does PyPy 5.7 exist?)

[gcamp]

First of all, I'm using PyPy version 5.6. The read me says the requirements is PyPy version 5.7 but as far as know 5.6 is the latest version.

I've done a small package where I can reproduce the problem on a homebrew-installed PyPy.

 pypy -m pip install utf8proc

I can install without problem on Python.

PyPy get_include() :

Python 2.7.12 (aff251e543859ce4508159dd9f1a82a2f553de00, Nov 13 2016, 01:57:41)
[PyPy 5.6.0 with GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>> import pybind11
>>>> pybind11.get_include()
'/usr/local/Cellar/pypy/5.6.0/libexec'
>>>> pybind11.get_include(True)
'/Users/gcamp/.local/include/python2.7'
>>>>

And indeed /usr/local/Cellar/pypy/5.6.0/libexec doesn't include the pybind11 headers.

Python get_include() :

Python 2.7.13 (default, Dec 18 2016, 07:03:39)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pybind11
>>> pybind11.get_include()
'/usr/local/include/python2.7'
>>> pybind11.get_include(True)
'/Users/gcamp/Library/Python/2.7/include/python2.7'

Here /usr/local/include/python2.7 includes the pybind11 headers.

[dean0x7d]

PyPy v5.7 is still in development but it's required because previous versions don't support enough of the C API to work with pybind11. On homebrew, you can install the latest nightly with brew install --HEAD pypy (beware, it takes quite some time).

That said, I just tried pip_pypy install pybind11 with PyPy v5.7 and it fails with:

IOError: [Errno 13] Permission denied: '/usr/local/Cellar/pypy/HEAD-f3abf62ba364/libexec/include/eval.h'

Looks like the headers are being installed directly into the include directory instead if include/pybind11 (thus trying to overwrite an existing file which is also called eval.h.). But I'm not sure if it's a bug on the pypy or pybind11 side.

[wjakob]

The installation path issue sound like a Pip+PyPy problem (pybind11 does nothing special in this regard, and it's not clear that we could do anything in this project to change the behavior). I suppose this is a "WONTFIX".

[wojdyr]

FTR I just tried PyPy 5.9 with the latest pip, they still have this problem.
pypy2-v5.9.0-linux64/bin/pip install . gets files installed directly in the include/ and include/detail/ directories (eval.py does not get installed).
Then pip uninstall pybind11 removes eval.h from PyPy.

[filips123]

@dean0x7d @wjakob I'm still having the same issue with Pip installing includes into root includes directory. Although it doesn't fail with a permission error, it fails when another package (which depends on pybind11) tries to include it. I tested this with pypywheels/manylinux2010-pypy_x86_64 Docker image on PyPy2.7 and PyPy3.6 7.3.0.

Is there anything you could done to fix this? If not, does this mean that pybind11 does not work with PyPy?