[tor-bugs] #20492 [Core Tor/Tor]: Tor git version displayed on Linux, but not macOS

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#20492: Tor git version displayed on Linux, but not macOS
------------------------------+-----------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  regression, log, easy
Actual Points:                |  Parent ID:
       Points:  0.5           |   Reviewer:
      Sponsor:                |
------------------------------+-----------------------------------
 When I compile tor on macOS, it doesn't log the git version on startup:
 {{{
 Oct 29 01:27:48.261 [notice] Tor 0.3.0.0-alpha-dev running on Darwin with
 Libevent 2.0.22-stable, OpenSSL 1.0.2j and Zlib 1.2.8.
 }}}

 This happens regardless of compiler and architecture:
 gcc (MacPorts gcc49 4.9.4_0+universal) 4.9.4 (i386/x86_64)
 clang version 3.9.0 (tags/RELEASE_390/final) (x86_64)

 $ git --version
 git version 2.10.1


 But when I compile it on Linux, I see a git commit hash:
 {{{
 Oct 28 14:28:15.669 [notice] Tor 0.3.0.0-alpha-dev (git-f3e158edf7d8128d)
 running on Linux with Libevent 2.0.21-stable, OpenSSL 1.0.2g and Zlib
 1.2.8.
 }}}

 Compiler:
 gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4

 $ git --version
 git version 2.6.3.36.g9a8c740

 I'm putting this in 0.3.0 because it makes diagnosing issues much easier
 if we have the full commit. But feel free to disagree.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20492>
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