llvmlibc-callee-namespace

Checks all calls resolve to functions within __llvm_libc namespace.

namespace __llvm_libc {

// Allow calls with the fully qualified name.
__llvm_libc::strlen("hello");

// Allow calls to compiler provided functions.
(void)__builtin_abs(-1);

// Bare calls are allowed as long as they resolve to the correct namespace.
strlen("world");

// Disallow calling into functions in the global namespace.
::strlen("!");

} // namespace __llvm_libc