[MacPorts] #56523: modglue @1.19 fails to build against libsigcxx2 @2.10.0

[MacPorts]

#56523: modglue @1.19 fails to build against libsigcxx2 @2.10.0
----------------------+--------------------
  Reporter:  jmroot   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  modglue  |
----------------------+--------------------

Comment (by kencu):

 The clang in Xcode 10:
 {{{
 $ /usr/bin/clang --version
 Apple LLVM version 10.0.0 (clang-1000.11.45.2)
 Target: x86_64-apple-darwin17.7.0
 Thread model: posix
 InstalledDir:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 }}}
 does not build this, however, so I guess it still is defaulting to the old
 c++ standard.

-- 
Ticket URL: <https://trac.macports.org/ticket/56523#comment:2>
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