[issue28542] document cross compilation

[Martin Panter]

Martin Panter added the comment:

Regarding 2.7, I guess it depends on your definition of “support”. People have been cross-compiling Python 2.7 longer than I have been working on Python. In the past I have tried to apply cross compilation fixes to 2.7. But if you are only confident about 3.6, let’s just stick with that for the moment.

FWIW, DESTDIR, --prefix, etc are not specific to cross compilation or Android. DESTDIR is also useful when building a package/tarball or whatever, rather than installing directly. And --prefix would be useful if you don’t have root access and want to install to $HOME or somewhere. These settings are mentioned in the 2.7 README, but it looks like Guido trimmed them out for Python 3.0 (revision 07d67a9725a7).

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<http://bugs.python.org/issue28542>
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