Steve Dower <steve.do...@python.org> added the comment:

> What matters there is compiling the underlying lzma, bz2, and sqlite3 
> libraries with PGO.  that isn't done as part of our build system.

On Windows they are linked in as source files, which is why it matters for us. 
On platforms where we rely on system libraries for this it doesn't matter.

We currently don't PGO OpenSSL on Windows, which would probably be nice but is 
much harder to set up as we use their build scripts. Libffi is built in our 
build though, so adding ctypes would get that covered, but I'm not so worried 
about it.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36044>
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