[MacPorts] #51726: Gildas Install Fail

[MacPorts]

#51726: Gildas Install Fail
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  Reporter:  jtb1435@…  |      Owner:  bardeau
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:             |   Keywords:
      Port:  gildas     |
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Comment (by ryandesign):

 This is basically the same as #59753 now.

 Back when this ticket was filed, MacPorts used the same default C++ stdlib
 as Apple, which meant that on 10.8 and earlier we used libstdc++. But
 gildas has its build system hardcoded to use `-lc++` when linking
 something that was built with clang++, which would have been the wrong
 decision on 10.8 and earlier back then. clang++ would have built stuff
 using libstdc++, and then when it came time to link, gildas would try to
 link that with libc++, which couldn't possibly work.

 But now MacPorts 2.6.0 has been released, in which we changed the default
 C++ stdlib for 10.6-10.8 from libstdc++ to libc++ for better compatibility
 with newer software requiring C++11 and later. This should mask the
 `-lc++` problem in the gildas build system, except that (per #59753) the
 portfile isn't passing the necessary `-stdlib=...` flag when building
 things with clang++, so it's still (erroneously now) building things for
 the compiler's default of libstdc++.

 This problem would not occur on 10.9 or later, where Apple's default C++
 stdlib is libc++, which explains why the user no longer sees the problem
 after upgrading the OS.

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Ticket URL: <https://trac.macports.org/ticket/51726#comment:24>
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