[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[Sylvain Corlay]

Sylvain Corlay added the comment:

We use it in the pybind11 project. I am not sure that homebrew does anything 
wrong.

It is just that it is the only case I am aware of where the `install_headers` 
command does not install headers in a subdirectory of 
`sysconfig.get_path('include')`. On the other hand, 
pip.locations.distutil_scheme provides the location used by install_headers.

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[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[Tim Smith]

Tim Smith added the comment:

As a Homebrew maintainer I'm happy to consider improving Homebrew's 
configuration if someone can point me to an extant package that uses this 
mechanism.

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nosy: +tdsmith

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[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[Ned Deily]

Ned Deily added the comment:

Sylvain, OK.  I suggest you bring the matter up on the distutils-sig mailing 
list (if you haven't already) because that's where discussions and decisions 
are made about features for Python packaging including distutils.  Otherwise, 
the issue is likely to languish here.  Good luck!

https://mail.python.org/mailman/listinfo/distutils-sig

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[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[Sylvain Corlay]

Sylvain Corlay added the comment:

Ned, that is because these packages (lxml, cffi) have header files as 
`package_data`, instead of `headers`. This is why they are being copied into 
site-packages. People willing to include them must either rely on knowledge of 
their location, or a python functions returning if (like numpy's get_include)

Distutils provides a standard way of distributing headers. These are passed to 
the setup function via the `headers` keyword argument, which triggers the 
`install_headers` command.

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[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[Ned Deily]

Ned Deily added the comment:

"When installing a python package that has `headers`, these headers are usually 
installed under the main python include directory".  Can you give some specific 
examples of packages and platforms where that is the case?  Just taking a quick 
look at some packages I happen to have installed, like lxml and cffi using a 
vanilla pip with a vanilla Unix-y Python 3.5.1, their header files get 
installed in the site-packages directory by default (using pip), not the main 
Python include directory.  And various distributors of Python have their own 
preferences where to install things, for example, the locations you cite are 
those used by Homebrew on OS X and differ from other OS X Pythons.  I'm not 
sure that there is a general solution as things stand now; I think there is 
probably a lot of variability among packages (e.g. their setup.py) and Python 
distributions.

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nosy: +ned.deily

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[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[SilentGhost]

Changes by SilentGhost :


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components: +Distutils
nosy: +dstufft, eric.araujo

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[issue26955] Implement equivalent to `pip.locations.distutils_scheme` in distutils

[Sylvain Corlay]

New submission from Sylvain Corlay:

When installing a python package that has `headers`, these headers are usually 
installed under the main python include directory, which can be retrieved with 
`sysconfig.get_path('include')` or directly referred to as 'include' when 
setting the include directories of an extension module. 

However, on some systems like OS X, headers for extension modules are not 
located in under the python include directory 
(/usr/local/Cellar/pythonX/X.Y.Z/Frameworks/Python.framework/Versions/X.Y/include/pythonX.Y)
 but in `/usr/local/include/pythonX.Y`.

Is there a generic way to find the location where  headers are installed in a  
python install?

pip.locations implements `distutils_scheme` which seems to be returning the 
right thing, but it seems to be a bit overkill to require pip. On the other 
side, no path returned by sysconfig corresponds to 
`/usr/local/include/pythonX.Y`

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messages: 264836
nosy: sylvain.corlay
priority: normal
severity: normal
status: open
title: Implement equivalent to `pip.locations.distutils_scheme` in distutils
type: enhancement
versions: Python 3.6

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