cpython/Misc/NEWS.d/next/Core and Builtins/2019-09-24-05-32-27.bpo-114...

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Better control over symbol visibility is provided through use of the
visibility attributes available in gcc >= 4.0, provided in a uniform way
across POSIX and Windows. The POSIX build files have been updated to compile
with -fvisibility=hidden, minimising exported symbols.