[U-Boot] [U-Boot, v3] Makefile: honor PYTHON configuration properly

[Tom Rini]

On Mon, Aug 14, 2017 at 08:59:11AM +0200, Clément Bœsch wrote:

> On some systems `python` is `python3` (for instance, Archlinux). The
> `PYTHON` variable can be used to point to `python2` to have a successful
> build.
> 
> The use of `PYTHON` is currently limited in the Makefile and needs to be
> extended in other places:
> 
> First, pylibfdt is required to be a Python 2 binding (binman imports
> pylibfdt and is only compatible Python 2), so its setup.py needs to be
> called accordingly. An alternative would be to change the libfdt
> setup.py shebang to python2, but the binding is actually portable. Also,
> it would break on system where there is no such thing as `python2`.
> 
> Secondly, the libfdt import checks need to be done against Python 2 as
> well since the Python 2 compiled modules (in this case _libdft.so) can
> not be imported from Python 3.
> 
> Note on the libfdt imports: "@if ! PYTHONPATH=tools $(PYTHON) -c 'import
> libfdt'; then..." is probably simpler than the currently sub-optimal
> pipe.
> Reviewed-by: Jonathan Gray <jsg at jsg.id.au>

Applied to u-boot/master, thanks!

-- 
Tom
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