[MacPorts] #39975: Add --enable-cxx11 for some variants

[MacPorts]

#39975: Add --enable-cxx11 for some variants
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 Reporter:  jfcaron@…    |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.0
 Keywords:  cxx11        |       Port:  root
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 The current ROOT can compile (with ACLiC) code with C++11 extensions, but
 emits a warning unless ROOT was built with --enable-cxx11.  It seems that
 several of the +gcc4X and +clang variants should be able to handle C++11,
 so could we make those variants use --enable-cxx11 in order to suppress
 warnings for progressive users?  I don't know what else --enable-cxx11
 actually does beyond suppress the warnings.

 ROOT Talk reference:  http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=15591

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Ticket URL: <https://trac.macports.org/ticket/39975>
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