Compile cpplib cpplib.cpp
Linking cpplib
Compile cwrapper cwapper.cpp
Compile cpp-exec main.cpp
Linking cwrapper
Compile Swift Module 'swift_exec' (1 sources)
Linking ./.build/debug/swift-exec
Linking cpp-exec
Undefined symbols for architecture x86_64:
  "std::__1::basic_ostream<char, std::__1::char_traits<char> >::operator<<(int)", referenced from:
      _main in main.cpp.o
  "std::__1::cout", referenced from:
      _main in main.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
<unknown>:0: error: build had 1 command failures