[tor-bugs] #24629 [Core Tor/Tor]: Activate osx builds on travis, at low priority

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#24629: Activate osx builds on travis, at low priority
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  not-just-linux, tor-ci, teor-was-    |  Actual Points:
  assigned, 034-triage-20180328,                 |
  034-removed-20180328, 034-backport,            |
  035-removed-20180711, fast-fix                 |
Parent ID:                                       |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  assigned => needs_review


Comment:

 Please see my branch travis-osx-v7 on https://github.com/teor2345/tor.git

 I rewrote and simplified the build matrix.

 We have the following builds on all platforms (Linux, macOS) and compilers
 (gcc, clang):
 * no Rust (with hardening, which is the default)
 * Rust online (without hardening due to #25386/#26398)

 We have the following builds on Linux gcc:
 * coverage
 * no hardening
 * distcheck
 * disable module dirauth
 * Rust offline (without hardening due to #25386/#26398)
 * distcheck with Rust online (without hardening due to #25386/#26398)
 * disable module dirauth with Rust online (without hardening due to
 #25386/#26398)

 That gives us 15 builds rather than the previous 13, so CI should complete
 in a similar time. (I'm seeing 5 builders allocated at a time when
 building this branch.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24629#comment:19>
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