[issue31536] `make regen-all` triggers wholesale rebuild

[Antoine Pitrou]

Antoine Pitrou added the comment:

Posted https://github.com/python/cpython/pull/3678 which uses a separate utility.  It seems to save 1 minute off the build step on Travis-CI.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31536>
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