[MacPorts] #65314: doxygen-devel @1.9.4: build fails for 10.7 through 10.12: undefined vtable symbols

[MacPorts]

#65314: doxygen-devel @1.9.4: build fails for 10.7 through 10.12: undefined vtable
symbols
----------------------------+-----------------------
  Reporter:  ryandesign     |      Owner:  michaelld
      Type:  defect         |     Status:  reopened
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.2
Resolution:                 |   Keywords:
      Port:  doxygen-devel  |
----------------------------+-----------------------

Comment (by michaelld):

 @kencu: Thanks for that sleuthing! Do you know where the "fix" is in
 libc++ (e.g., "the" commit)?

 OK so we have "Throwing bad_variant_access is supported starting in
 macosx10.13" ... but ... if we instead use MP's libc++.a, which contains
 the fixes that are not in macOS/Apple's libc++.a, then this would "work
 around" the issue?

 Is there some way we can use LegacySupport to declare the problematic
 symbols & then use that to work around the issue? That seems more
 tractable if we can do so.

-- 
Ticket URL: <https://trac.macports.org/ticket/65314#comment:25>
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