[MacPorts] #69455: poppler @24.03.0: build failure on macOS 10.14 and earlier due to use of std::filesystem

[MacPorts]

#69455: poppler @24.03.0: build failure on macOS 10.14 and earlier due to use of
std::filesystem
-------------------------+-------------------------------------------------
  Reporter:  lukaso      |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  tiger leopard snowleopard lion
                         |  mountainlion mavericks yosemite elcapitan
      Port:  poppler     |  sierra highsierra mojave
-------------------------+-------------------------------------------------

Comment (by erikbs):

 Replying to [comment:25 thetrial]:
 > But I did not understand the macports-libcxx linking thing?

 Putting that statement in the Portfile makes MacPorts insert a few
 compile/link options so that Clang links against
 `/opt/local/lib/libcxx/libc++.dylib` (updated libc++ provided through
 MacPorts) instead of `/usr/lib/libc++.dylib` (provided by the OS, will be
 whatever version came with the OS). Compiling with Clang 16/17 is in
 itself not enough, because, like older Clang versions, these newer
 versions will also link against the libc++ version in /usr/lib by default,
 and it lacks std::filesystem support on 10.14 and older.

-- 
Ticket URL: <https://trac.macports.org/ticket/69455#comment:26>
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