[MacPorts] #57590: py-fiona @1.7.13: fatal error: 'type_traits' file not found

[MacPorts]

#57590: py-fiona @1.7.13: fatal error: 'type_traits' file not found
-------------------------------+----------------------
 Reporter:  ryandesign         |      Owner:  stromnov
     Type:  defect             |     Status:  assigned
 Priority:  Normal             |  Milestone:
Component:  ports              |    Version:
 Keywords:  lion mountainlion  |       Port:  py-fiona
-------------------------------+----------------------
 py-fiona fails to build on 10.7 and 10.8:

 {{{
 /opt/local/bin/clang-mp-5.0 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-
 prototypes -arch x86_64 -I/opt/local/include
 -I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7
 -c fiona/_transform.cpp -o
 build/temp.macosx-10.7-x86_64-2.7/fiona/_transform.o -std=c++11
 In file included from fiona/_transform.cpp:609:
 /opt/local/include/cpl_conv.h:372:10: fatal error: 'type_traits' file not
 found
 #include <type_traits> // for std::is_base_of
          ^~~~~~~~~~~~~
 1 error generated.
 error: command '/opt/local/bin/clang-mp-5.0' failed with exit status 1
 }}}

 Since the port requires C++11, it needs to include the cxx11 1.1
 portgroup. But that's not enough, because you'll notice it is compiling
 C++ code using the C compiler, and MacPorts doesn't supply C++ flags to a
 C compiler. This appears to be because unfortunately distutils doesn't
 really support C++ software at all. There is a
 [https://bugs.python.org/issue1222585 13-year-old upstream bug report]
 about that, with a patch, but I guess the python developers don't care.

 So somehow the CXXFLAGS will need to be given to the C compiler to make
 this work.

-- 
Ticket URL: <https://trac.macports.org/ticket/57590>
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