cmTarget: Move member `Utilities` to impl

Source/cmTarget.cxx

@@ -168,6 +168,7 @@ public:
   cmStateEnums::TargetType TargetType;
   cmMakefile* Makefile;
   cmPropertyMap Properties;
+  std::set<BT<std::string>> Utilities;
   std::set<std::string> SystemIncludeDirectories;
   std::vector<std::string> IncludeDirectoriesEntries;
   std::vector<cmListFileBacktrace> IncludeDirectoriesBacktraces;
@@ -481,10 +482,15 @@ cmGlobalGenerator* cmTarget::GetGlobalGenerator() const
   return impl->Makefile->GetGlobalGenerator();
 }
 
-void cmTarget::AddUtility(std::string const& u, cmMakefile* mf)
+void cmTarget::AddUtility(std::string const& name, cmMakefile* mf)
 {
-  BT<std::string> util(u, mf ? mf->GetBacktrace() : cmListFileBacktrace());
-  this->Utilities.insert(util);
+  impl->Utilities.insert(
+    BT<std::string>(name, mf ? mf->GetBacktrace() : cmListFileBacktrace()));
+}
+
+std::set<BT<std::string>> const& cmTarget::GetUtilities() const
+{
+  return impl->Utilities;
 }
 
 cmListFileBacktrace const& cmTarget::GetBacktrace() const
@@ -1461,12 +1467,12 @@ const char* cmTarget::GetProperty(const std::string& prop) const
       return output.c_str();
     }
     if (prop == propMANUALLY_ADDED_DEPENDENCIES) {
-      if (this->Utilities.empty()) {
+      if (impl->Utilities.empty()) {
         return nullptr;
       }
 
       static std::string output;
-      output = cmJoin(this->Utilities, ";");
+      output = cmJoin(impl->Utilities, ";");
       return output.c_str();
     }
     if (prop == propIMPORTED) {

Source/cmTarget.h

@@ -184,16 +184,14 @@ public:
   bool GetIsGeneratorProvided() const { return this->IsGeneratorProvided; }
   void SetIsGeneratorProvided(bool igp) { this->IsGeneratorProvided = igp; }
 
-  /** Add a utility on which this project depends. A utility is an executable
+  /**
+   * Add a utility on which this project depends. A utility is an executable
    * name as would be specified to the ADD_EXECUTABLE or UTILITY_SOURCE
    * commands. It is not a full path nor does it have an extension.
    */
-  void AddUtility(std::string const& u, cmMakefile* mf = nullptr);
+  void AddUtility(std::string const& name, cmMakefile* mf = nullptr);
   ///! Get the utilities used by this target
-  std::set<BT<std::string>> const& GetUtilities() const
-  {
-    return this->Utilities;
-  }
+  std::set<BT<std::string>> const& GetUtilities() const;
 
   ///! Set/Get a property of this target file
   void SetProperty(const std::string& prop, const char* value);
@@ -301,7 +299,6 @@ private:
 
 private:
   bool IsGeneratorProvided;
-  std::set<BT<std::string>> Utilities;
   cmPolicies::PolicyMap PolicyMap;
   std::string Name;
   std::string InstallPath;