Only output includes once after the start of 'generate-time' when debugging.

During configure-time, GetIncludeDirectories may be called too, for example
if using the export() command. As the content can be different, it should
be output each time then.

Source/cmGlobalGenerator.cxx

@@ -980,6 +980,7 @@ void cmGlobalGenerator::Generate()
   // Generate project files
   for (i = 0; i < this->LocalGenerators.size(); ++i)
     {
+    this->LocalGenerators[i]->GetMakefile()->SetGeneratingBuildSystem();
     this->SetCurrentLocalGenerator(this->LocalGenerators[i]);
     this->LocalGenerators[i]->Generate();
     this->LocalGenerators[i]->GenerateInstallRules();

Source/cmMakefile.cxx

@@ -99,6 +99,7 @@ cmMakefile::cmMakefile(): Internal(new Internals)
   this->AddDefaultDefinitions();
   this->Initialize();
   this->PreOrder = false;
+  this->GeneratingBuildSystem = false;
 }
 
 cmMakefile::cmMakefile(const cmMakefile& mf): Internal(new Internals)

Source/cmMakefile.h

@@ -870,6 +870,9 @@ public:
     return this->IncludeDirectoriesEntries;
   }
 
+  bool IsGeneratingBuildSystem(){ return this->GeneratingBuildSystem; }
+  void SetGeneratingBuildSystem(){ this->GeneratingBuildSystem = true; }
+
 protected:
   // add link libraries and directories to the target
   void AddGlobalLinkInformation(const char* name, cmTarget& target);
@@ -1019,6 +1022,9 @@ private:
 
   // Enforce rules about CMakeLists.txt files.
   void EnforceDirectoryLevelRules();
+
+  bool GeneratingBuildSystem;
+
 };
 
 //----------------------------------------------------------------------------

Source/cmTarget.cxx

@@ -151,6 +151,7 @@ cmTarget::cmTarget()
   this->IsApple = false;
   this->IsImportedTarget = false;
   this->BuildInterfaceIncludesAppended = false;
+  this->DebugIncludesDone = false;
 }
 
 //----------------------------------------------------------------------------
@@ -2739,11 +2740,17 @@ std::vector<std::string> cmTarget::GetIncludeDirectories(const char *config)
     cmSystemTools::ExpandListArgument(debugProp, debugProperties);
     }
 
-  bool debugIncludes = std::find(debugProperties.begin(),
+  bool debugIncludes = !this->DebugIncludesDone
+                    && std::find(debugProperties.begin(),
                                  debugProperties.end(),
                                  "INCLUDE_DIRECTORIES")
                         != debugProperties.end();
 
+  if (this->Makefile->IsGeneratingBuildSystem())
+    {
+    this->DebugIncludesDone = true;
+    }
+
   for (std::vector<cmTargetInternals::IncludeDirectoriesEntry*>::const_iterator
       it = this->Internal->IncludeDirectoriesEntries.begin(),
       end = this->Internal->IncludeDirectoriesEntries.end();

Source/cmTarget.h

@@ -610,6 +610,7 @@ private:
   bool DLLPlatform;
   bool IsApple;
   bool IsImportedTarget;
+  bool DebugIncludesDone;
   mutable std::map<cmStdString, std::set<std::string> >
                                                       LinkDependentProperties;
   mutable std::set<std::string> LinkImplicitNullProperties;