[MacPorts] #55872: gcc7 @7.3.0: Selftests fail with "Illegal instruction: 4"

[MacPorts]

#55872: gcc7 @7.3.0: Selftests fail with "Illegal instruction: 4"
-----------------------+---------------------------
  Reporter:  chucko58  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:  sierra x86_64
      Port:  gcc7      |
-----------------------+---------------------------

Comment (by chucko58):

 We have an old version of XCode installed on this machine. I am going to
 pursue updating it with our local system support people.

 {{{
 razor:~ cfry$ clang --version
 Apple LLVM version 8.0.0 (clang-800.0.38)
 Target: x86_64-apple-darwin16.7.0
 Thread model: posix
 InstalledDir:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 razor:~ cfry$
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55872#comment:1>
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