Readonly file io error (#1346)

* Copy cpp source with copy.mode = false

Fixes #1345

* Add to ChangeLog

* Fix ChangeLog formatting

---------

Co-authored-by: Simon Guest <[email protected]>

Author: tesujimath

ChangeLog

@@ -1,3 +1,7 @@
+2024-11-25  Simon Guest  <[email protected]>
+
+	* src/attributes.cpp: fix CPP source having to be writable
+
 2024-11-03  Marco Colombo  <[email protected]>
 
 	* vignettes/rmd/Rcpp-FAQ.Rmd: Fixed typos

src/attributes.cpp

@@ -3279,7 +3279,7 @@ namespace {
 
             // copy the source file to the build dir
             Rcpp::Function filecopy = Rcpp::Environment::base_env()["file.copy"];
-            filecopy(cppSourcePath_, generatedCppSourcePath(), true);
+            filecopy(cppSourcePath_, generatedCppSourcePath(), true, Rcpp::_["copy.mode"] = false);
 
             // parse attributes
             SourceFileAttributesParser sourceAttributes(cppSourcePath_, "", true);