[MacPorts] #55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system

[MacPorts]

#55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  tiger leopard snowleopard lion
      Port:  cmake       |  mountainlion
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Comment (by ryandesign):

 Replying to [comment:40 ryandesign]:
 > On 10.5 i386 I am having other problems: #55442, #55443. On 10.5 ppc,
 the port already builds successfully with gcc6. We could just give up on
 libc++ for 10.5 and make the portgroup use gcc6 on 10.5 i386 too.

 I forgot that libcxx/libcxxabi/libunwind force a universal build. On
 Leopard/Tiger that would result in ppc code being built, which clang
 doesn't do. This convinces me that we should forget libc++ for 10.5 and
 use gcc6 there too.

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Ticket URL: <https://trac.macports.org/ticket/55382#comment:42>
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