At the present time, for R 3.6.3 and Rcpp v1.0.4 there is an issue with the CRAN binaries of Rcpp.
When compiling, you may receive an error message with:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/unistd.h:655,
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/gethostuuid.h:39:17:
error: 'uuid_t' was not declared in this scope; did you mean 'Rcpp::uuid_t'?
39 | int gethostuuid(uuid_t, const struct timespec *) __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
| ^~~~~~
| Rcpp::uuid_t
Solution
The fix is to download and install a patched version of Rcpp from its source at the Rcpp project’s drat repository using:
install.packages("Rcpp", repos="https://rcppcore.github.io/drat")
This only affects macOS users on macOS later than 10.11 (El Capitan).
Why did this occur?
As part of Rcpp v1.0.4, Rcpp’s exception class – Rcpp::exception – was
made thread-safe in PR #1043.
Unintentionally, the execinfo.h file was placed inside of the Rcpp namespace,
rather than globally. Within PR #1047,
the inclusion order was fixed with a longer-term solution for support on demangling
exceptions raised.
Details of the issue and resolution can be found here: