Fix headers for clang 6 build

[aknarts]

Fixes these issues during the build:

------- Build details --------
  Using clang (/usr/bin/clang++) version '6.0.0' (string), 6 (major), 0 (minor), 0 (patch)
  Using bundled libc++ standard C++ library.
  Using lld linker
  Using llvm-ar : /usr/bin/llvm-ar
  Using fast way to relink  circularly dependent libraries (no FixDeps).
  ------------------------------
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonConsole/Private/PyFbxFactory.cpp(1): error: Expected PyFbxFactory.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonConsole/Private/PythonConsoleModule.cpp(1): error: Expected PythonConsoleModule.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonConsole/Private/PythonScriptFactory.cpp(1): error: Expected PythonScriptFactory.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonConsole/Private/SPythonConsole.cpp(1): error: Expected SPythonConsole.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonConsole/Private/SPythonLog.cpp(1): error: Expected SPythonLog.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/DirectoryScanner.cpp(1): error: Expected DirectoryScanner.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PYRichTextSyntaxHighlighterTextLayoutMarshaller.cpp(1): error: Expected PYRichTextSyntaxHighlighterTextLayoutMarshaller.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonEditorCustomization.cpp(1): error: Expected PythonEditorCustomization.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonEditorStyle.cpp(1): error: Expected PythonEditorStyle.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonProject.cpp(1): error: Expected PythonProject.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonProjectEditor.cpp(1): error: Expected PythonProjectEditor.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonProjectEditorCommands.cpp(1): error: Expected PythonProjectEditorCommands.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonProjectEditorToolbar.cpp(1): error: Expected PythonProjectEditorToolbar.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonProjectItem.cpp(1): error: Expected PythonProjectItem.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/PythonSyntaxTokenizer.cpp(1): error: Expected PythonSyntaxTokenizer.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/SProjectViewItem.cpp(1): error: Expected SProjectViewItem.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/SPythonEditableText.cpp(1): error: Expected SPythonEditableText.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/SPythonEditor.cpp(1): error: Expected SPythonEditor.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/SPythonProjectEditor.cpp(1): error: Expected SPythonProjectEditor.h to be first header included.
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/PythonEditor/Private/WhiteSpaceTextRun.cpp(1): error: Expected WhiteSpaceTextRun.h to be first header included.
  ERROR: Build canceled.

[aknarts]

Just a note this still fails with:

  ------- Build details --------
  Using clang (/usr/bin/clang++) version '6.0.0' (string), 6 (major), 0 (minor), 0 (patch)
  Using bundled libc++ standard C++ library.
  Using lld linker
  Using llvm-ar : /usr/bin/llvm-ar
  Using fast way to relink  circularly dependent libraries (no FixDeps).
  ------------------------------
  Performing 190 actions (8 in parallel)
  [1/190] Compile UEPyAudio.cpp
  [2/190] Compile UEPyCapture.cpp
  [3/190] Compile UEPyController.cpp
  [4/190] Compile UEPyDataTable.cpp
  [5/190] Compile UEPyExporter.cpp
  [6/190] Compile UEPyHUD.cpp
  [7/190] Compile UEPyInput.cpp
  [8/190] Compile UEPyLandscape.cpp
  [9/190] Compile UEPyMaterial.cpp
  [10/190] Compile UEPyMovements.cpp
  [11/190] Compile UEPyNavigation.cpp
  [12/190] Compile UEPyObject.cpp
  [13/190] Compile UEPyPackage.cpp
  [14/190] Compile UEPyPawn.cpp
  [15/190] Compile UEPyPhysics.cpp
  [16/190] Compile UEPyPlayer.cpp
  [17/190] Compile UEPySequencer.cpp
  [18/190] Compile UEPySkeletal.cpp
  [19/190] Compile UEPySpline.cpp
  [20/190] Compile UEPyAttaching.cpp
  [21/190] Compile UEPyStaticMesh.cpp
  [22/190] Compile UEPyAnimSequence.cpp
  [23/190] Compile UEPyFSlateApplication.cpp
  [24/190] Compile UEPySPythonEditorViewport.cpp
  [26/190] Compile UEPySPythonShelf.cpp
  [25/190] Compile UEPySPythonListView.cpp
  [27/190] Compile UEPySPythonTreeView.cpp
  [28/190] Compile UEPySPythonWidget.cpp
  [29/190] Compile UEPySRotatorInputBox.cpp
  [30/190] Compile UEPySScrollBox.cpp
  [31/190] Compile UEPySSlider.cpp
  [32/190] Compile UEPySSpacer.cpp
  [33/190] Compile UEPySSplitter.cpp
  [34/190] Compile UEPySTableViewBase.cpp
  [35/190] Compile UEPySTextBlock.cpp
  [36/190] Compile UEPySTreeView.cpp
  [37/190] Compile UEPySVectorInputBox.cpp
  [38/190] Compile UEPySVerticalBox.cpp
  [39/190] Compile UEPySViewport.cpp
  [40/190] Compile UEPySWidget.cpp
  [41/190] Compile UEPySWindow.cpp
  [42/190] Compile UEPySlate.cpp
  [43/190] Compile UEPyActor.cpp
  [44/190] Compile UEPySPythonComboBox.cpp
  [45/190] Compile UEPyTexture.cpp
  [46/190] Compile UEPyTransform.cpp
  [47/190] Compile UEPyFSoftSkinVertex.cpp
  [48/190] Compile UEPyFStringAssetReference.cpp
  [49/190] Compile UEPyFTransform.cpp
  [50/190] Compile UEPyFVector.cpp
  [51/190] Compile UEPyFViewportClient.cpp
  [52/190] Compile PyActor.gen.cpp
  [53/190] Compile PyCharacter.gen.cpp
  [54/190] Compile PyCommandlet.gen.cpp
  [55/190] Compile PyHUD.gen.cpp
  [56/190] Compile PyNativeWidgetHost.gen.cpp
  [57/190] Compile PyPawn.gen.cpp
  [58/190] Compile PyUserWidget.gen.cpp
  [59/190] Compile PythonBlueprintFunctionLibrary.gen.cpp
  [60/190] Compile PythonClass.gen.cpp
  [61/190] Compile PythonComponent.gen.cpp
  [62/190] Compile PythonDelegate.gen.cpp
  [63/190] Compile PythonFunction.gen.cpp
  [64/190] Compile PythonScript.gen.cpp
  [65/190] Compile UnrealEnginePython.init.gen.cpp
  [66/190] Compile UEPyFSocket.cpp
  [67/190] Compile UEPyTraceAndSweep.cpp
  [68/190] Compile UEPyFSlowTask.cpp
  [69/190] Compile UEPyFRawMesh.cpp
  [70/190] Compile UEPyUserDefinedStruct.cpp
  [71/190] Compile UEPyViewport.cpp
  [72/190] Compile UEPyWidget.cpp
  [73/190] Compile UEPyWidgetComponent.cpp
  [74/190] Compile UEPyWorld.cpp
  [75/190] Compile UEPyIVoiceCapture.cpp
  [76/190] Compile UEPyESlateEnums.cpp
  [77/190] Compile UEPyFARFilter.cpp
  [78/190] Compile UEPyFAssetData.cpp
  [79/190] Compile UEPyFColor.cpp
  [80/190] Compile UEPyFEditorViewportClient.cpp
  [81/190] Compile UEPyFHitResult.cpp
  [82/190] Compile UEPyFLinearColor.cpp
  [83/190] Compile UEPyFMorphTargetDelta.cpp
  [84/190] Compile UEPyFObjectThumbnail.cpp
  [85/190] Compile UEPyFPythonOutputDevice.cpp
  [86/190] Compile UEPyFQuat.cpp
  [87/190] Compile UEPyFRandomStream.cpp
  [88/190] Compile UEPyFRawAnimSequenceTrack.cpp
  [89/190] Compile UEPyFRotator.cpp
  [90/190] Compile UEPySProgressBar.cpp
  [91/190] Compile UEPySPythonMultiColumnTableRow.cpp
  [92/190] Compile UEPySOverlay.cpp
  [93/190] Compile UEPyUClassesImporter.cpp
  [94/190] Compile UEPyUScriptStruct.cpp
  [95/190] Compile UEPyUStructsImporter.cpp
  [96/190] Compile UEPyVisualLogger.cpp
  [97/190] Compile UnrealEnginePython.cpp
  [98/190] Compile UEPyEdGraph.cpp
  [99/190] Compile UEPyEdGraphPin.cpp
  [100/190] Compile UEPyICollectionManager.cpp
  [101/190] Compile UEPyIConsoleManager.cpp
  [102/190] Compile UEPyFbxIOSettings.cpp
  [103/190] Compile UEPyFbxImporter.cpp
  [104/190] Compile UEPyFbxManager.cpp
  [105/190] Compile UEPyFbxMesh.cpp
  [106/190] Compile UEPyFbxNode.cpp
  [107/190] Compile UEPyFbxObject.cpp
  [108/190] Compile UEPyFbxPose.cpp
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxIOSettings.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxIOSettings.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxImporter.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxImporter.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxManager.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxManager.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxMesh.cpp:2:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxMesh.h:7:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxNode.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxNode.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxObject.cpp:2:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxObject.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  [109/190] Compile UEPyFbxProperty.cpp
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxPose.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxPose.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  1 error generated.
  [110/190] Compile UEPySPanel.cpp
  1 error generated.
  [111/190] Compile UEPyIHttpBase.cpp
  1 error generated.
  [112/190] Compile UEPyTimer.cpp
  1 error generated.
  [113/190] Compile UEPyIHttpRequest.cpp
  1 error generated.
  [114/190] Compile UEPyTicker.cpp
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxProperty.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxProperty.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  1 error generated.
  [115/190] Compile UEPyModule.cpp
  1 error generated.
  [116/190] Compile PyActor.cpp
  [117/190] Compile PyCharacter.cpp
  [118/190] Compile PyCommandlet.cpp
  1 error generated.
  [119/190] Compile PyHUD.cpp
  [120/190] Compile PyNativeWidgetHost.cpp
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UEPyModule.cpp:45:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbx.h:7:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxManager.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  [121/190] Compile PyPawn.cpp
  [122/190] Compile PyUserWidget.cpp
  [123/190] Compile PythonBlueprintFunctionLibrary.cpp
  [124/190] Compile PythonComponent.cpp
  1 error generated.
  [125/190] Compile PythonDelegate.cpp
  [126/190] Compile PythonFunction.cpp
  [127/190] Compile PythonScript.cpp
  [128/190] Compile PythonSmartDelegate.cpp
  [129/190] Compile UEPyAssetUserData.cpp
  [130/190] Compile UEPyCallable.cpp
  [131/190] Compile UEPyEditor.cpp
  [132/190] Compile UEPyEngine.cpp
  [133/190] Compile UEPyEnumsImporter.cpp
  [134/190] Compile UEPyIPlugin.cpp
  [135/190] Compile UEPySubclassing.cpp
  [136/190] Compile UEPyIHttpResponse.cpp
  [137/190] Compile UEPyFbxScene.cpp
  [138/190] Compile UEPyFCharacterEvent.cpp
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxScene.cpp:1:
  In file included from /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/Fbx/UEPyFbxScene.h:6:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk.h:98:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxloadingstrategy.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxplugin.h:20:
  In file included from ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxobject.h:21:
  ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h:1188:70: error: binding dereferenced null pointer to reference has undefined behavior [-Werror,-Wnull-dereference]
                  return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);
                                                                                     ^~~~~~~~~~~~~~~~~~~
  [139/190] Compile UEPySDirectoryPicker.cpp
  [140/190] Compile UEPySDockTab.cpp
  [141/190] Compile UEPyFMaterialEditorUtilities.cpp
  [142/190] Compile UEPySEditableTextBox.cpp
  [143/190] Compile UEPySEditorViewport.cpp
  1 error generated.
  [144/190] Compile UEPySFilePathPicker.cpp
  [145/190] Compile UEPySGraphEditor.cpp
  [146/190] Compile UEPySGraphPanel.cpp
  [147/190] Compile UEPySGridPanel.cpp
  [148/190] Compile UEPySHeaderRow.cpp
  [149/190] Compile UEPySHorizontalBox.cpp
  [150/190] Compile UEPySImage.cpp
  [151/190] Compile UEPySLeafWidget.cpp
  [152/190] Compile UEPySLevelViewport.cpp
  [153/190] Compile UEPySListView.cpp
  [154/190] Compile UEPySMultiLineEditableText.cpp
  [155/190] Compile UEPySNodePanel.cpp
  [156/190] Compile UEPySNumericEntryBox.cpp
  [157/190] Compile UEPySObjectPropertyEntryBox.cpp
  [158/190] Compile UEPySCompoundWidget.cpp
  [159/190] Compile UEPySColorBlock.cpp
  [160/190] Compile UEPySDropTarget.cpp
  [161/190] Compile UEPySCanvas.cpp
  [162/190] Compile UEPyFGeometry.cpp
  [163/190] Compile UEPyFInputEvent.cpp
  [164/190] Compile UEPyFKeyEvent.cpp
  [165/190] Compile UEPyFMenuBuilder.cpp
  [166/190] Compile UEPyFModifierKeysState.cpp
  [167/190] Compile UEPySCheckBox.cpp
  [168/190] Compile UEPyFPointerEvent.cpp
  [169/190] Compile UEPyFSlateIcon.cpp
  [170/190] Compile UEPyFSlateStyleSet.cpp
  [171/190] Compile UEPyFPaintContext.cpp
  [172/190] Compile UEPyFTabSpawnerEntry.cpp
  [173/190] Compile UEPyFTabManager.cpp
  [174/190] Compile UEPySBoxPanel.cpp
  [175/190] Compile UEPySBox.cpp
  [176/190] Compile UEPySBorder.cpp
  [177/190] Compile UEPySButton.cpp
  [178/190] Compile UEPyIStructureDetailsView.cpp
  [179/190] Compile UEPyIDetailsView.cpp
  [180/190] Compile UEPyFToolBarBuilder.cpp
  [181/190] Compile UEPySAssetDropTarget.cpp
  [182/190] Compile Module.PythonEditor.gen.cpp
  [183/190] Compile Module.PythonAutomation.cpp
  [184/190] Compile Module.PythonConsole.cpp
  [185/190] Compile Module.PythonConsole.gen.cpp
  [186/190] Compile Module.PythonEditor.cpp
  ERROR: UBT ERROR: Failed to produce item: /home/user/temp/HostProject/Plugins/UnrealEnginePython/Binaries/Linux/libUE4Editor-UnrealEnginePython.so
  Total build time: 274.81 seconds (Local executor: 0.00 seconds)
Took 275.174322s to run mono, ExitCode=5

Looking into it, this is not this plugins issue but more of an engine not supporting clang 6 yet officially(Although it builds and compiles ok).

[rdeioris]

Hi, the error is present in clang-3.9 too. I am investigating if i can bypass it

[aknarts]

I found a way to bypass it but it requires modification of the fbxproperty.h which is not really desirable from the plugin standpoint.

Just for the posterity this works:(line 1188 in Engine/Source/ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h)

                return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(eFbxEnum), pValue, pForceSet, pFlags);
//              return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);

After this the errors move a bit further(working on it).

  [104/184] Compile UEPyFbxImporter.cpp
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:303:18: error: use of undeclared identifier 'IPlugin'
          for (TSharedRef<IPlugin>plugin : IPluginManager::Get().GetEnabledPlugins())
                          ^
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:303:26: error: unknown type name 'plugin'
          for (TSharedRef<IPlugin>plugin : IPluginManager::Get().GetEnabledPlugins())
                                  ^
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:303:33: error: expected unqualified-id
          for (TSharedRef<IPlugin>plugin : IPluginManager::Get().GetEnabledPlugins())
                                         ^
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:312:2: error: expected ';' in 'for' statement specifier
          if (ZipPath.IsEmpty())
          ^
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:312:2: error: expected expression
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:360:17: error: expected ')'
          Py_Initialize();
                         ^
  /home/user/temp/HostProject/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Private/UnrealEnginePython.cpp:303:6: note: to match this '('
          for (TSharedRef<IPlugin>plugin : IPluginManager::Get().GetEnabledPlugins())
              ^
  [105/184] Compile UEPyFbxManager.cpp
  6 errors generated.
  [106/184] Compile UEPyFbxMesh.cpp

I might just be building it wrong at this point

/home/user/fastrepos/UnrealEngine/Engine/Build/BatchFiles/RunUAT.sh -nop4 -verbose BuildPlugin -NoHostPlatform -TargetPlatforms=Linux -plugin=/home/user/repos/UnrealEnginePython/UnrealEnginePython.uplugin -Unversioned -package=/home/user/temp/

[mmmaat]

Hello, I experimented the same error with the FBX module when compiling with clang-3.9 on the new Ubuntu-18.04 (clang-3.8 is no more available on that distribution). The fix you propose @aknarts works pretty well. So modifying line 1188 in Engine/Source/ThirdParty/FBX/2018.1.1/include/fbxsdk/core/fbxproperty.h is sufficient:

return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(eFbxEnum), pValue, pForceSet, pFlags);
// return StaticInit(pObject, pName, FbxGetDataTypeFromEnum(FbxTypeOf(*((FbxReference*)0))), pValue, pForceSet, pFlags);

Thank you!