don't declare unused arguments (#716)

for -Wextra

Author: krlmlr

inst/include/Rcpp/exceptions.h

@@ -33,7 +33,7 @@ namespace Rcpp {
             include_call_(include_call){
             rcpp_set_stack_trace(Shield<SEXP>(stack_trace()));
         }
-        exception(const char* message_, const char* file, int line, bool include_call = true) :
+        exception(const char* message_, const char*, int, bool include_call = true) :
             message(message_),
             include_call_(include_call){
             rcpp_set_stack_trace(Shield<SEXP>(stack_trace()));

src/attributes.cpp

@@ -2199,7 +2199,7 @@ namespace attributes {
         }
     }
 
-    void CppExportsIncludeGenerator::writeEnd(bool hasPackageInit) {
+    void CppExportsIncludeGenerator::writeEnd(bool) {
         ostr() << "}" << std::endl;
         ostr() << std::endl;
         ostr() << "#endif // " << getHeaderGuard() << std::endl;
@@ -2283,7 +2283,7 @@ namespace attributes {
         includeDir_ = packageDir +  fileSep + "inst" +  fileSep + "include";
     }
 
-    void CppPackageIncludeGenerator::writeEnd(bool hasPackageInit) {
+    void CppPackageIncludeGenerator::writeEnd(bool) {
         if (hasCppInterface()) {
             // header guard
             std::string guard = getHeaderGuard();			// #nocov start
@@ -2390,7 +2390,7 @@ namespace attributes {
         }
     }
 
-    void RExportsGenerator::writeEnd(bool hasPackageInit) {
+    void RExportsGenerator::writeEnd(bool) {
         if (hasCppInterface()) {				// #nocov start
              // register all C-callable functions
             ostr() << "# Register entry points for exported C++ functions"