problem exporting Rcpp functions

I want to make a C++ function aviliable to R with the // [[Rcpp::export]] command. This does not work when using the rstan.package.skeleton. I get the error "object '[name of the rcpp function]' not found". It appears to be some problem with registering the routine.

However, if I remove lines 16:20 from src\init.cpp the registration works. Here is the code from those lines:

void attribute_visible R_init_sem5r1c(DllInfo *dll) {
  // next line is necessary to avoid a NOTE from R CMD check
  R_registerRoutines(dll, NULL, CallEntries, NULL, NULL);
  R_useDynamicSymbols(dll, TRUE); // necessary for .onLoad() to work
}

What do these lines of code actually do and are they safe to remove?

Read src/init.cpp lines 16:20 and the rstan.package.skeleton-generated registration path, then reproduce the missing-object error with an Rcpp::export function. Done means documenting the role of these lines and determining whether they can be removed without breaking registration or .onLoad().