[issue25300] Enable Intel MPX (Memory protection Extensions) feature

[STINNER Victor]

STINNER Victor added the comment:

Why not enablind the option by default if GCC 5.1 or newer is detected? Is there a risk of breaking third-party extensions?

Should we pass the MPX compiler options to third-party extensions by way?

I'm not sure that it's ok to add such change to Python 2.7. It's border line between new feature and supporting a new architecture.

I would suggest to only modify Python 3.6.

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<http://bugs.python.org/issue25300>
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