has_devel returns TRUE or FALSE. check_devel
throws an error if you don't have developer tools installed. Implementation
based on a suggestion by Simon Urbanek. End-users (particularly those on
Windows) should generally run check_build_tools() rather than
check_compiler().
Usage
has_compiler(debug = FALSE)
check_compiler(debug = FALSE)
Arguments
debug
If TRUE, will print out extra information useful for
debugging. If FALSE, it will use result cached from a previous run.