[MacPorts] #38389: LLVM C11 support

[MacPorts]

#38389: LLVM C11 support
-------------------------+--------------------------------
 Reporter:  l@…          |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Low          |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:  C11          |       Port:  hdf5-18
-------------------------+--------------------------------
 Hello,

 For the C++ support for this port under Xcode if compiling with LLVM
 stdlib the flag -stdlib=libc++ is required if a project has been compiled
 with LLVM C11 support in Xcode. As such the following variant is necessary
 for the linker to not complain.

 variant c11 description {
     Build with C11 support.
 } conflicts universal gcc44 gcc45 gcc46 gcc47 {
     configure.cxxflags          -stdlib=libc++
 }

 Given that LLVM is the default compiler now, this should perhaps even be a
 default variant....

 /Lasse

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Ticket URL: <https://trac.macports.org/ticket/38389>
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