[tor-bugs] #25386 [Core Tor/Tor]: Link Rust Tests to C Dependencies in Tor (allow integration testing from Rust to C)

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#25386: Link Rust Tests to C Dependencies in Tor (allow integration testing from
Rust to C)
-------------------------------------------------+-------------------------
 Reporter:  Hello71                              |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  accepted
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.3.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  rust, tor-test, 033-backport,        |  Actual Points:
  review-group-34, 034-triage-20180328,          |
  034-included-20180401                          |
Parent ID:                                       |         Points:  3
 Reviewer:  isis                                 |        Sponsor:
                                                 |  SponsorQ
-------------------------------------------------+-------------------------

Comment (by teor):

 Replying to [comment:73 isis]:
 > Replying to [comment:71 nickm]:
 > > > Can we make it optional?
 > >
 > > Sure -- but someone will need to come up with a mechanism that works
 and doesn't cause too much pain.
 >
 > So 1.27 is now the stable rust, and it [https://github.com/rust-
 lang/rust/pull/49956/commits/1a0d7a8207907e2459db8df72a8f604cdcc8285f does
 include] the `-C` option for rustdoc.
 >
 > I'm not exactly understanding which part is supposed to be optional? Is
 it:
 >
 > 1. Passing the same flags as we pass to `RUSTFLAGS` to the `rustdoc -C`
 should be optional?

 Yes, we need to be able to:
 * pass -C when rustdoc supports it (should we do an autoconf test?)
 * not pass -C when rustdoc doesn't support it

 I don't know if we need to be able to:
 * disable -C even if rustdoc supports it - do we need to check that we can
 compile without -C?

 > 2. Or, compiling tests which expect to use C code should be optional?
 (If so, see #26398.)

 Yes, we need to be able to:
 * disable rustdoc tests which use C code when rustdoc doesn't support -C

 I don't know if we need to be able to:
 * disable all rust tests that use C code - do we need to make tests
 faster, or check we can compile rust-only?

 > 3. Or something else?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25386#comment:74>
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