Rcpp project clean and rebuild - c++

Question

I'm trying to build the sample hello world file that comes by default when an Rcpp package project is created in RStudio on Mac.
I'm using latest version of RStudio (Version 1.3.959) and R (4.0.2). The clang version is 11.0.3 and have the command line tools installed.
Unlike the expected compile output of rcpp_hello_world.cpp to create .o objects I see that in my project, RStudio uses R and tries to byte-compile, avoiding the C compilation.
I also updated the Makeconf for gnu++17
(CXX = clang++ -mmacosx-version-min=10.13 -std=gnu++17)
I haev installed Rcpp, RcppEigen and BH packages and created a new Rcpp project and I updated the NAMESPACE file to recognize the Rcpp tags for interface functions.
Here is the output I got:
==> Rcpp::compileAttributes()
* Updated R/RcppExports.R
==> R CMD INSTALL --preclean --no-multiarch --with-keep.source RcppPackage003a
* installing to library ‘/Users/username/Library/R/4.0/library’
* installing *source* package ‘RcppPackage003a’ ...
** using staged installation
** R
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for ‘RcppPackage003a’ in library.dynam(lib, package, package.lib):
shared object ‘RcppPackage003a.so’ not found
Error: loading failed
Execution halted
Any pointers on what I could be doing wrong and why it's not trying to compile the src files?
As a quick Rcpp install test I was able to call a C++ function from R (referring this doc - http://heather.cs.ucdavis.edu/Rcpp.pdf)
by sourcing a test cpp file with following function -
#include <Rcpp.h>
// [[Rcpp::export]]
void hello()
{
Rprintf("Hello, world!\n");
}
and then in R console calling the hello function after sourcing the cpp file:
library(Rcpp)
sourceCpp("hello.cpp")
hello()
How can I debug the missing link where it is not picking up the cpp file to be compiled?
Thanks in advance!