[MacPorts] #59753: gildas @201911b: does not build for the right C++ stdlib (undefined symbols)

[MacPorts]

#59753: gildas @201911b: does not build for the right C++ stdlib (undefined
symbols)
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  bardeau
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  gildas      |
-------------------------+----------------------

Comment (by bardeau):

 Regarding the C++ link: I am a bit confused by all the information given,
 in particular in #51726. But as far as I understand, you suggest to use
 the MacPorts variable ${configure.cxxflags} to compile the C++ files.
 Under my environment, it resolves as "-Os -stdlib=libc++". This is
 unfortunate as it provides a compilation flag (-Os) together with a link
 flag (-stdlib=libc++). In Gildas, compilation and link are 2 clearly
 separated steps. Which configuration variable provides only the C++
 **compilation** flags?

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Ticket URL: <https://trac.macports.org/ticket/59753#comment:6>
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