[MacPorts] #55510: cmake 3.10.0 fails to build on leopard

[MacPorts]

#55510: cmake 3.10.0 fails to build on leopard
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  Reporter:  rmottola  |      Owner:  michaelld
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  leopard
      Port:  cmake     |
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Comment (by rmottola):

 That looks nasty - it is failing inside Apple's header if I understand it
 right.

 I found references to this error both elsewhere, e.g:
 [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61759] but the poster says
 it "went away" and in other tickets on MacPorts:
 [https://trac.macports.org/ticket/54358]

 I understand that I should patch my system a little according to
 [https://trac.macports.org/wiki/LeopardSDKFixes]
 I already fixed the Mac version define: I found that out some time ago
 while compiling some perfectly good software that works on 10.4 and 10.6
 and mysteriously failed to compile on 10.5!

 And switch to clang? or did somebody understand/fix gcc6 in the meanwhile.
 Perhaps gcc7 can be attempted? Can I easily change the port to test gcc7
 or clang? Currently I have clang3.4 and gcc6 installed, not gcc7.

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Ticket URL: <https://trac.macports.org/ticket/55510#comment:10>
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