[MacPorts] #53123: botan links against libstdc++ on 10.6 with libcxx, preventing qca from building. And workaround.

[MacPorts]

#53123: botan  links against libstdc++ on 10.6 with libcxx, preventing qca from
building. And workaround.
---------------------+--------------------------------
  Reporter:  kencu   |      Owner:  macports-tickets@…
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard
      Port:  botan   |
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Comment (by kencu):

 Still lots of troubles with botan -- on a 10.7 machine it needs to be
 installed with cxx11 1.1 to support qt5-qtcreator, and in doing so the c++
 standard lib linkages are all wrong. I found this block in db60 which
 works nicely when added to botan, though, to fix this issue by adding the
 standard library setting onto the compiler spec:

 {{{
 set cxx_stdlibflags {}
 if {[string match *clang* ${configure.cxx}]} {
     set cxx_stdlibflags -stdlib=${configure.cxx_stdlib}
 }
 configure.cxx ${configure.cxx} ${cxx_stdlibflags}
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53123#comment:5>
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