[tor-bugs] #27468 [Core Tor/Tor]: CI: add builds with the latest clang and gcc

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#27468: CI: add builds with the latest clang and gcc
--------------------------+------------------------------------
 Reporter:  teor          |          Owner:  teor
     Type:  enhancement   |         Status:  assigned
 Priority:  Medium        |      Milestone:  Tor: 0.3.5.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-ci        |  Actual Points:
Parent ID:  #27389        |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by teor):

 The exact compiler versions are:

 Appveyor:
 {{{
 /mingw64/bin/x86_64-w64-mingw32-gcc
 x86_64-w64-mingw32-gcc.exe (Rev1, Built by MSYS2 project) 8.2.0
 }}}
 https://ci.appveyor.com/project/torproject/tor/build/1.0.812/job/b6u0ch7yee8k9wbq?fullLog=true#L117

 {{{
 /mingw32/bin/i686-w64-mingw32-gcc
 i686-w64-mingw32-gcc.exe (Rev2, Built by MSYS2 project) 7.3.0
 }}}
 https://ci.appveyor.com/project/torproject/tor/build/1.0.812/job/p6n8jma1xb6adci1?fullLog=true#L116

 Travis:

 Linux:
 {{{
 gcc version
 gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
 ...
 clang version
 clang version 5.0.0 (tags/RELEASE_500/final)
 Target: x86_64-unknown-linux-gnu
 Thread model: posix
 InstalledDir: /usr/local/clang-5.0.0/bin
 }}}
 https://travis-ci.org/torproject/tor/jobs/426696914#L27

 macOS:
 {{{
 LLVM 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/torproject/tor/jobs/426696919#L40

 Unfortunately, this isn't very useful, because Apple's open-source clangs
 stop at 800:
 https://opensource.apple.com/source/clang/

 But that's ok, because we should run unusual compilers on Linux, because
 it's faster.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27468#comment:2>
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