[tor-bugs] #27376 [Core Tor/Tor]: Travis: Actually use gcc on OS X

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#27376: Travis: Actually use gcc on OS X
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     Reporter:  teor          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-ci, gcc, easy, intro
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 On macOS, gcc is an alias to clang:
 {{{
 GCC version
 Apple LLVM version 9.1.0 (clang-902.0.39.2)
 Target: x86_64-apple-darwin17.4.0
 Thread model: posix
 InstalledDir:
 /Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 }}}
 https://travis-ci.org/teor2345/tor/jobs/421941946#L35

 Doc update:
 https://github.com/travis-ci/docs-travis-ci-com/pull/2002

 If we want to use gcc on OS X, we have to set a specific GCC version in
 the environmental variables:
 https://deploy-preview-2002--musing-lamport-
 7fb66c.netlify.com/user/languages/c/#gcc-on-os-x

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27376>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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