[MacPorts] #72023: swi-prolog @9.2.9: Patch idea for macOS 10.11.6

[MacPorts]

#72023: swi-prolog @9.2.9: Patch idea for macOS 10.11.6
--------------------------+---------------------------
  Reporter:  kogule       |      Owner:  JanWielemaker
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.10.5
Resolution:               |   Keywords:  elcapitan
      Port:  swi-prolog   |
--------------------------+---------------------------
Changes (by ryandesign):

 * keywords:   => elcapitan


Comment:

 Don't close the ticket, please. It's an accurate bug report. swi-prolog
 doesn't build on OS X 10.11 and earlier.

 If you would like to know which compilers MacPorts believes support each
 language standard, see CompilerSelection.

 The user's compiler is not misconfigured. It is normal that the system C++
 library will be used, even when a newer compiler is used. The system C++
 library may not support newer C++ language features.

 The [source:macports-ports/_resources/port1.0/group/legacysupport-1.1.tcl
 legacy support portgroup] offers the `legacysupport.use_mp_libcxx` option
 which can be set to `yes` to indicate that MacPorts should use a newer
 MacPorts copy of the C++ library instead for this port. I cannot guarantee
 that doing this won't have adverse consequences. For example, I don't know
 what happens if any of swi-prolog's dependencies use the system C++
 library and swi-prolog uses a newer MacPorts C++ library and objects
 created with one library are passed to code using the other library. Back
 when the C++ library was GCC's libstdc++ that kind of thing did definitely
 cause runtime crashes but I don't know if the same applies to LLVM's
 libc++.

-- 
Ticket URL: <https://trac.macports.org/ticket/72023#comment:7>
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