flanker Disable writing parsetab files to disk.

This fixes https://github.com/mailgun/flanker/issues/206.

Before this change, when multiple Python processes are simultaneously doing a from flanker.addresslib import address, it's possible for some of them to crash in ply code.

See https://github.com/dabeaz/ply/pull/184, where I attempted to work around this issue by changing ply. You can see in this comment: https://github.com/dabeaz/ply/pull/184#issuecomment-425413897 that the author of ply suggests two workarounds for this issue:

Remove ply as a dependency in setup.py and copy the source code of ply into flanker.
Disable writing parsetab files to disk when invoking yacc.

seemed like the simpler solution to me, so that's what I've done here.

Sep 30 '18 20:09 jfly

Can one of the admins verify this patch?

Sep 30 '18 20:09 mailgun-ci

(Full disclosure, I haven't tested this at all because I'm not sure how to.)

Sep 30 '18 20:09 jfly

Bump! Any feedback on this PR?

Oct 22 '18 19:10 jfly

Bump!

Jan 08 '19 21:01 jfly

Bump! Can anyone take a look?

Mar 21 '19 02:03 jfly

Bump! Anyone got some time to take a look at this?

Jun 17 '19 21:06 jfly