The flag will activate LTO and PGO build support when available.
Thanks to Alecsandur Patrascu of Intel for the original patch.

Issue #16334. Patch written by Serhiy Storchaka.

modules.

Issue #27776: The os.urandom() function does now block on Linux 3.17 and newer
until the system urandom entropy pool is initialized to increase the security.

This change is part of the PEP 524.

Class was dead code. Thanks to Xiang Zhang for the patch.

Issue #27778: Expose the Linux getrandom() syscall as a new os.getrandom()
function.

This change is part of the PEP 524.

Initial patch by Alex LordThorsen.

This completes PEP 519.

Issue #17884.

This is to add support for os.exec*() and os.spawn*() functions. Part
of PEP 519.

Patch by Brett Cannon.

C implementation of unpickler.  UnpicklingError is now raised instead of
AttributeError and ValueError in some cases.