[issue17781] optimize compilation options

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Hum, does it make sense to enable LTO without PGO?

Probably not.

By the way, I now have a small ARM system to play with, and there the gain of LTO+PGO over PGO alone is around 10%.

Also note LTO can make compilation times much longer (it's the linking step actually, which can take minutes).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17781>
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