[MacPorts] #65778: libfilezilla @0.32.0: link fails for 10.7 thru 10.12: undefined symbols for std::bad_variant_access

[MacPorts]

#65778: libfilezilla @0.32.0: link fails for 10.7 thru 10.12: undefined symbols for
std::bad_variant_access
---------------------------+----------------------
  Reporter:  mascguy       |      Owner:  mascguy
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:
      Port:  libfilezilla  |
---------------------------+----------------------

Comment (by barracuda156):

 Replying to [comment:2 kencu]:
 > if libfilezilla doesn’t use exceptions in the code, then explicitly
 turning exceptions off with -f flag that disables them should fix this. No
 exceptions, no throws, so no missing throw function. Code errors will
 abort instead of throwing an exception.
 >
 > if it does use exceptions, then macports-libcxx would be plan B.
 Slightly riskier, and possibly Filezilla might need to use it too if they
 share a lot of objects back and forth. Have to test that to see if it
 crashes.
 >
 > Longer-term, there are currently three c++17 headers that throw, and all
 are broken on 10.7 to 10.12 as libcxx there does not have the symbols
 (although 10.5 and 10.6 are OK as they use a newer libcxx), and none of
 this applies to libgcc so that route is available.
 >
 > These missing libcxx functions could most easily probably be  static
 inlined into the three headers on 10.7 through 10.12, or might be added to
 compiler_rt in clang to provide them… both of those would be fairly easy
 projects for someone interested. Easy to implement, easy to test.
 >
 > It is also conceivable that filesystem from the libcxx subproject could
 be added to compiler_rt as well on those systems, but with more work and
 testing needed there to be sure everything filesystem needs from libcxx
 can be found in the system libcxx.
 >

 Thank you! I will try that.

 Seen this error with some other ports too, for instance `spot`:
 https://build.macports.org/builders/ports-10.8_x86_64-builder/builds/133092/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/65778#comment:3>
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