[issue28833] cross compilation of third-party extension modules

[Xavier de Gaye]

Xavier de Gaye added the comment:

So I suggest we start with this patch as it works for:
* The standard library extension modules (for debian as well).
* The third-party extension modules on platforms that have multiarch defined and on platforms that do not have multiarch defined (on debian systems one can only use the build directory for XBUILD_PYTHON_DIR, the other systems can use the three options described in msg281993).

Then we can later extend the semantics of XBUILD_PYTHON_DIR to include the multiarch triplet if this is necessary for debian systems, unless the debian developers want to continue using the system they have developed and are currently using to cross compile third-party extension modules.

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<http://bugs.python.org/issue28833>
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