cmMakefile: Create a unified raii for macro scopes.

Source/cmMacroCommand.cxx

@@ -96,12 +96,8 @@ bool cmMacroHelperCommand::InvokeInitialPass
     return false;
     }
 
-  // Enforce matching logical blocks inside the macro.
-  cmMakefile::LexicalPushPop lexScope(this->Makefile);
-
-  // Push a weak policy scope which restores the policies recorded at
-  // macro creation.
-  cmMakefile::PolicyPushPop polScope(this->Makefile, true, this->Policies);
+  cmMakefile::MacroPushPop macroScope(this->Makefile,
+                                      this->Policies);
 
   // set the value of argc
   std::ostringstream argcDefStream;
@@ -191,8 +187,7 @@ bool cmMacroHelperCommand::InvokeInitialPass
       {
       // The error message should have already included the call stack
       // so we do not need to report an error here.
-      lexScope.Quiet();
-      polScope.Quiet();
+      macroScope.Quiet();
       inStatus.SetNestedError(true);
       return false;
       }

Source/cmMakefile.cxx

@@ -1582,6 +1582,22 @@ void cmMakefile::PopFunctionScope(bool reportError)
   this->PopScope();
 }
 
+void cmMakefile::PushMacroScope(const cmPolicies::PolicyMap& pm)
+{
+  this->PushFunctionBlockerBarrier();
+
+  this->PushPolicy(true, pm);
+  this->PushPolicyBarrier();
+}
+
+void cmMakefile::PopMacroScope(bool reportError)
+{
+  this->PopPolicyBarrier(reportError);
+  this->PopPolicy();
+
+  this->PopFunctionBlockerBarrier(reportError);
+}
+
 //----------------------------------------------------------------------------
 class cmMakefileCurrent
 {
@@ -5451,3 +5467,16 @@ cmMakefile::FunctionPushPop::~FunctionPushPop()
 {
   this->Makefile->PopFunctionScope(this->ReportError);
 }
+
+
+cmMakefile::MacroPushPop::MacroPushPop(cmMakefile* mf,
+                                       const cmPolicies::PolicyMap& pm)
+  : Makefile(mf), ReportError(true)
+{
+  this->Makefile->PushMacroScope(pm);
+}
+
+cmMakefile::MacroPushPop::~MacroPushPop()
+{
+  this->Makefile->PopMacroScope(this->ReportError);
+}

Source/cmMakefile.h

@@ -759,8 +759,23 @@ public:
     bool ReportError;
   };
 
+  class MacroPushPop
+  {
+  public:
+    MacroPushPop(cmMakefile* mf,
+                    cmPolicies::PolicyMap const& pm);
+    ~MacroPushPop();
+
+    void Quiet() { this->ReportError = false; }
+  private:
+    cmMakefile* Makefile;
+    bool ReportError;
+  };
+
   void PushFunctionScope(cmPolicies::PolicyMap const& pm);
   void PopFunctionScope(bool reportError);
+  void PushMacroScope(cmPolicies::PolicyMap const& pm);
+  void PopMacroScope(bool reportError);
   void PushScope();
   void PopScope();
   void RaiseScope(const std::string& var, const char *value);