LLVM C11 support

[l@…]

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