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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> I'm going to formally reject this, since GCC removed -fmpx support.

"The MPX extensions to the C and C++ languages have been deprecated and will be removed in a future release."
https://gcc.gnu.org/gcc-8/changes.html

Oh. It seems like the reason is to "reduce the maintenance burden".

Some links:

* https://www.kernel.org/doc/Documentation/x86/intel_mpx.txt
* https://en.wikipedia.org/wiki/Intel_MPX
* https://www.phoronix.com/scan.php?page=news_item&px=GCC-Possible-MPX-Deprecation

A patch has been proposed to remove MPX from GCC 9 (no merged?):
https://www.phoronix.com/scan.php?page=news_item&px=GCC-Patch-To-Drop-MPX

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