[MacPorts] #56878: openscad-devel @2018.04-1: error: use of undeclared identifier 'nullptr'

[MacPorts]

#56878: openscad-devel @2018.04-1: error: use of undeclared identifier 'nullptr'
--------------------+----------------------
 Reporter:  kencu   |      Owner:  dstrubbe
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 On darwin11, build fails with above error.

 adding
 {{{
 PortGroup cxx11 1.1
 }}}
 didn't fix it. Thereafter adding both these:
 {{{
 configure.cxxflags-append -std=c++11
 configure.objcxxflags-append -std=c++11
 }}}
 didn't fix it either.

 qt4 is a bit picky/tricky about these things. I may need to edit the build
 file directly and add `-std=c++11` to the QMAKE OJCXX flags, unless there
 is an easier way.

 It seems (in the log) that this build specifically disables `c++11`
 earlier in the build configuration due to `libstdc++` (I guess it doesn't
 see `libc++`, and/or doesn't know what `macports-libstdc++` might be).

 This built fine on 10.6.8 configured to libc++, amongst other systems,
 earlier this year. I have a feeling this may be another example of the
 type of fixes we will no longer have to do once we default to `libc++` on
 all systems.

-- 
Ticket URL: <https://trac.macports.org/ticket/56878>
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