[tor-bugs] #22106 [Core Tor/Tor]: Initial Rust support

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#22106: Initial Rust support
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 Reporter:  Sebastian     |          Owner:
     Type:  defect        |         Status:  needs_revision
 Priority:  Medium        |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by Sebastian):

 Wow. This took half a day and a lot of ugly hacks, but this is ready for
 review now. It can build without rust (default), with rust and locally
 supplied dependencies via submodule (default if using rust), with rust and
 locally supplied dependencies in a given directory (via configure env
 variable) or with rust and using crates.io (via configure switch).

 We detect Rust compiler version (requiring 1.14 as of now, which will be
 included in stretch) as well as the presence of all required crates during
 configure.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22106#comment:13>
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