This happens when the linker is invoked right after the giant call to g++ to build everything:
ld: warning: option -s is obsolete and being ignored ld: internal error: atom not found in symbolIndex(__ZN10GameWindow10TextLayoutC2EjiN4nall6stringE) for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [dice] Error 1