Support for environment markers for data_files

[Aluriak]

Environment markers are supported by #1520. However, with the following lines in my setup.cfg:

[options.data_files]
bin =
    bin/linux/mybin; platform_system=="Linux"
    bin/macos/mybin; platform_system=="Darwin"
    bin/win/mybin.exe; platform_system=="Windows"

And the following package tree:

.
├── mypackage
│   └── __init__.py
├── MANIFEST.in
├── README.mkd
├── setup.cfg
└── setup.py
├── bin
    ├── linux
    │   └── mybin
    ├── macos
    │   └── mybin
    └── win
        └── mybin.exe

My goal is simply to provide in the path of user a binary, which is already compiled for the 3 main platforms (linux, mac, windows).

When running python setup.py install, i get the following last lines:

running build_py
installing package data to build/bdist.linux-x86_64/egg
running install_data
error: can't copy 'bin/linux/mybin; platform_system=="Linux"': doesn't exist or not a regular file

I tried to use the setup.py instead of setup.cfg, getting the same error:

setup(
    data_files=[
        ('/bin', [
            'bin/linux/mybin; platform_system=="Linux"',
            'bin/macos/mybin; platform_system=="Darwin"',
            'bin/win/mybin.exe; platform_system=="Windows"'
        ]),
    ]
)

What am i missing ?

Python 3.6.6
>>> import setuptools as s
>>> s.__version__
'40.8.0'

[benoit-pierre]

There's nothing about environment markers in #1520 or in setuptools' documentation for data_files. They are unsupported.