"cxxStandardLibrary: libc++" only works when clang is build against libc++abi on linux

property string cxxAbiLibrary: "libsupc++"
PropertyOptions {
        name: "cxxAbiLibrary"
        allowedValues: [ "libsupc++", "libc++abi", "libcxxrt" ]
        description: "version of the C++ABI library to use"
}
...
cpp.dynamicLibraries: {
        if ( qbs.toolchain.contains( "clang" ) && cxxStandardLibrary === "libc++" ) {
            if ( cxxAbiLibrary === "libsupc++" ) {
                return [ "supc++" ]
            } else if ( cxxAbiLibrary === "libc++abi" ) {
                return [ "c++abi" ]
            } else if ( cxxAbiLibrary === "libcxxrt" ) {
                return [ "cxxrt" ]
            }
        }
    }