removed usage of emptyString which would lead to a copy

Author: firewave

lib/checkunusedfunctions.cpp

@@ -412,7 +412,7 @@ void CheckUnusedFunctions::unusedFunctionError(ErrorLogger& errorLogger,
         locationList.back().fileIndex = fileIndex;
     }
 
-    const ErrorMessage errmsg(std::move(locationList), emptyString, Severity::style, "$symbol:" + funcname + "\nThe function '$symbol' is never used.", "unusedFunction", CWE561, Certainty::normal);
+    const ErrorMessage errmsg(std::move(locationList), "", Severity::style, "$symbol:" + funcname + "\nThe function '$symbol' is never used.", "unusedFunction", CWE561, Certainty::normal);
     errorLogger.reportErr(errmsg);
 }
 

lib/cppcheck.cpp

@@ -1298,7 +1298,7 @@ void CppCheck::internalError(const std::string &filename, const std::string &msg
     ErrorMessage::FileLocation loc1(filename, 0, 0);
 
     ErrorMessage errmsg({std::move(loc1)},
-                        emptyString,
+                        "",
                         Severity::error,
                         fullmsg,
                         "internalError",
@@ -1333,7 +1333,7 @@ void CppCheck::checkNormalTokens(const Tokenizer &tokenizer, AnalyzerInformation
                 if (mSettings.debugwarnings) {
                     ErrorMessage::FileLocation loc(tokenizer.list.getFiles()[0], 0, 0);
                     ErrorMessage errmsg({std::move(loc)},
-                                        emptyString,
+                                        "",
                                         Severity::debug,
                                         "Checks maximum time exceeded",
                                         "checksMaxTime",
@@ -1843,7 +1843,7 @@ void CppCheck::tooManyConfigsError(const std::string &file, const int numberOfCo
 
 
     ErrorMessage errmsg(std::move(loclist),
-                        emptyString,
+                        "",
                         Severity::information,
                         msg.str(),
                         "toomanyconfigs", CWE398,
@@ -1865,7 +1865,7 @@ void CppCheck::purgedConfigurationMessage(const std::string &file, const std::st
     }
 
     ErrorMessage errmsg(std::move(loclist),
-                        emptyString,
+                        "",
                         Severity::information,
                         "The configuration '" + configuration + "' was not checked because its code equals another one.",
                         "purgedConfiguration",

lib/preprocessor.cpp

@@ -340,7 +340,7 @@ std::list<Directive> Preprocessor::createDirectives(const simplecpp::TokenList &
                 continue;
             if (tok->next && tok->next->str() == "endfile")
                 continue;
-            Directive directive(tok->location, emptyString);
+            Directive directive(tok->location, "");
             for (const simplecpp::Token *tok2 = tok; tok2 && tok2->location.line == directive.linenr; tok2 = tok2->next) {
                 if (tok2->comment)
                     continue;

lib/templatesimplifier.cpp

@@ -3175,7 +3175,7 @@ bool TemplateSimplifier::simplifyTemplateInstantiations(
             if (mSettings.debugwarnings) {
                 ErrorMessage::FileLocation loc(mTokenList.getFiles()[0], 0, 0);
                 ErrorMessage errmsg({std::move(loc)},
-                                    emptyString,
+                                    "",
                                     Severity::debug,
                                     "Template instantiation maximum time exceeded",
                                     "templateMaxTime",
@@ -3251,7 +3251,7 @@ bool TemplateSimplifier::simplifyTemplateInstantiations(
             if (mSettings.debugwarnings) {
                 ErrorMessage::FileLocation loc(mTokenList.getFiles()[0], 0, 0);
                 ErrorMessage errmsg({std::move(loc)},
-                                    emptyString,
+                                    "",
                                     Severity::debug,
                                     "Template instantiation maximum time exceeded",
                                     "templateMaxTime",

lib/tokenize.cpp

@@ -1225,7 +1225,7 @@ void Tokenizer::simplifyTypedefCpp()
             if (mSettings.debugwarnings) {
                 ErrorMessage::FileLocation loc(list.getFiles()[0], 0, 0);
                 ErrorMessage errmsg({std::move(loc)},
-                                    emptyString,
+                                    "",
                                     Severity::debug,
                                     "Typedef simplification instantiation maximum time exceeded",
                                     "typedefMaxTime",