Mask definition of Rf_error to avoid longjmp issues

Author: Enchufa2

inst/include/Rcpp/macros/mask.h

@@ -21,15 +21,13 @@
 #define Rcpp_macros_mask_h
 
 #ifndef RCPP_NO_MASK_RF_ERROR
-#ifdef RCPP_MASK_RF_ERROR
 #define Rf_error(...) \
-    _Pragma("GCC warning \"Use of Rf_error() instead of Rcpp::stop(). Calls \
+    _Pragma("GCC error \"Use of Rf_error() instead of Rcpp::stop(). Calls \
 to Rf_error() in C++ contexts are unsafe: consider using Rcpp::stop() instead, \
 or define RCPP_NO_MASK_RF_ERROR if this is a false positive. More info:\n\
  - https://github.com/RcppCore/Rcpp/issues/1247\n\
  - https://github.com/RcppCore/Rcpp/pull/1402\"") \
     Rf_error(__VA_ARGS__)
 #endif
-#endif
 
 #endif