Module index files not properly generated in WebXML

With Qt 5.13.0, I can successfully generate the module index files (for instance, for ActiveQt, qaxserver-module) in HTML, but not in WebXML: the file is almost empty. The only change I make on my side is passing the --outputformat WebXML argument to qdoc in order to generate the WebXML version. As far as I can see, the classes have no such problem.

To be more precise, this is what I mean by empty:

<?xml version="1.0" encoding="UTF-8"?>
<WebXML>
<document/>
</WebXML>

OTOH, in HTML, I get a full-fledged file, with the right content (in attachment).

Here is how I call qdoc:

{{ C:\Qt\5.13.0\mingw73_64\bin\qdoc.exe
--outputdir C:\Qt\Doc513__
--installdir C:\Qt\Doc513__
C:\Qt\Doc513\qtdoctools-main.qdocconf
--single-exec
--log-progress
--timestamps
--debug
-I C:\Qt\Tools\mingw730_64\lib\gcc\x86_64-w64-mingw32\7.3.0\include\c++
-I C:\Qt\Tools\mingw730_64\lib\gcc\x86_64-w64-mingw32\7.3.0\include\c++\x86_64-w64-mingw32
-I C:\Qt\Tools\mingw730_64\lib\gcc\x86_64-w64-mingw32\7.3.0\include\c++\backward
-I C:\Qt\Tools\mingw730_64\lib\gcc\x86_64-w64-mingw32\7.3.0\include
-I C:\Qt\Tools\mingw730_64\lib\gcc\x86_64-w64-mingw32\7.3.0\include-fixed
-I C:\Qt\Tools\mingw730_64\x86_64-w64-mingw32\include
-I C:\Qt\5.13.0\mingw73_64\include
-I C:\Qt\5.13.0\Src\qtbase\qmake
-I C:\Qt\5.13.0\Src\qtandroidextras\src\androidextras\doc\QtAndroidExtras
-I C:\Qt\5.13.0\mingw73_64\include\ActiveQt
-I C:\Qt\5.13.0\mingw73_64\include\ActiveQt\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\ActiveQt\5.13.0\ActiveQt
-I C:\Qt\5.13.0\mingw73_64\include\ActiveQt\5.13.0\ActiveQt\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DAnimation
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DAnimation\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DAnimation\5.13.0\Qt3DAnimation
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DAnimation\5.13.0\Qt3DAnimation\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DCore
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DCore\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DCore\5.13.0\Qt3DCore
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DCore\5.13.0\Qt3DCore\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DExtras
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DExtras\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DExtras\5.13.0\Qt3DExtras
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DExtras\5.13.0\Qt3DExtras\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DInput
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DInput\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DInput\5.13.0\Qt3DInput
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DInput\5.13.0\Qt3DInput\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DLogic
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DLogic\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DLogic\5.13.0\Qt3DLogic
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DLogic\5.13.0\Qt3DLogic\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuick
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuick\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuick\5.13.0\Qt3DQuick
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuick\5.13.0\Qt3DQuick\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickAnimation
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickAnimation\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickAnimation\5.13.0\Qt3DQuickAnimation
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickAnimation\5.13.0\Qt3DQuickAnimation\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickExtras
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickExtras\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickExtras\5.13.0\Qt3DQuickExtras
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickExtras\5.13.0\Qt3DQuickExtras\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickInput
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickInput\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickInput\5.13.0\Qt3DQuickInput
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickInput\5.13.0\Qt3DQuickInput\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickRender
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickRender\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickRender\5.13.0\Qt3DQuickRender
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickRender\5.13.0\Qt3DQuickRender\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickScene2D
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickScene2D\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickScene2D\5.13.0\Qt3DQuickScene2D
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DQuickScene2D\5.13.0\Qt3DQuickScene2D\private
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DRender
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DRender\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DRender\5.13.0\Qt3DRender
-I C:\Qt\5.13.0\mingw73_64\include\Qt3DRender\5.13.0\Qt3DRender\private
-I C:\Qt\5.13.0\mingw73_64\include\QtAccessibilitySupport
-I C:\Qt\5.13.0\mingw73_64\include\QtAccessibilitySupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtAccessibilitySupport\5.13.0\QtAccessibilitySupport
-I C:\Qt\5.13.0\mingw73_64\include\QtAccessibilitySupport\5.13.0\QtAccessibilitySupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtANGLE
-I C:\Qt\5.13.0\mingw73_64\include\QtBluetooth
-I C:\Qt\5.13.0\mingw73_64\include\QtBluetooth\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtBluetooth\5.13.0\QtBluetooth
-I C:\Qt\5.13.0\mingw73_64\include\QtBluetooth\5.13.0\QtBluetooth\private
-I C:\Qt\5.13.0\mingw73_64\include\QtBodymovin
-I C:\Qt\5.13.0\mingw73_64\include\QtBodymovin\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtBodymovin\5.13.0\QtBodymovin
-I C:\Qt\5.13.0\mingw73_64\include\QtBodymovin\5.13.0\QtBodymovin\private
-I C:\Qt\5.13.0\mingw73_64\include\QtCharts
-I C:\Qt\5.13.0\mingw73_64\include\QtCharts\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtCharts\5.13.0\QtCharts
-I C:\Qt\5.13.0\mingw73_64\include\QtCharts\5.13.0\QtCharts\private
-I C:\Qt\5.13.0\mingw73_64\include\QtConcurrent
-I C:\Qt\5.13.0\mingw73_64\include\QtCore
-I C:\Qt\5.13.0\mingw73_64\include\QtCore\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtCore\5.13.0\QtCore
-I C:\Qt\5.13.0\mingw73_64\include\QtCore\5.13.0\QtCore\private
-I C:\Qt\5.13.0\mingw73_64\include\QtDataVisualization
-I C:\Qt\5.13.0\mingw73_64\include\QtDataVisualization\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtDataVisualization\5.13.0\QtDataVisualization
-I C:\Qt\5.13.0\mingw73_64\include\QtDataVisualization\5.13.0\QtDataVisualization\private
-I C:\Qt\5.13.0\mingw73_64\include\QtDBus
-I C:\Qt\5.13.0\mingw73_64\include\QtDBus\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtDBus\5.13.0\QtDBus
-I C:\Qt\5.13.0\mingw73_64\include\QtDBus\5.13.0\QtDBus\private
-I C:\Qt\5.13.0\mingw73_64\include\QtDesigner
-I C:\Qt\5.13.0\mingw73_64\include\QtDesigner\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtDesigner\5.13.0\QtDesigner
-I C:\Qt\5.13.0\mingw73_64\include\QtDesigner\5.13.0\QtDesigner\private
-I C:\Qt\5.13.0\mingw73_64\include\QtDesignerComponents
-I C:\Qt\5.13.0\mingw73_64\include\QtDesignerComponents\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtDesignerComponents\5.13.0\QtDesignerComponents
-I C:\Qt\5.13.0\mingw73_64\include\QtDesignerComponents\5.13.0\QtDesignerComponents\private
-I C:\Qt\5.13.0\mingw73_64\include\QtDeviceDiscoverySupport
-I C:\Qt\5.13.0\mingw73_64\include\QtDeviceDiscoverySupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtDeviceDiscoverySupport\5.13.0\QtDeviceDiscoverySupport
-I C:\Qt\5.13.0\mingw73_64\include\QtDeviceDiscoverySupport\5.13.0\QtDeviceDiscoverySupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtEdidSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtEdidSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtEdidSupport\5.13.0\QtEdidSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtEdidSupport\5.13.0\QtEdidSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtEglSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtEglSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtEglSupport\5.13.0\QtEglSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtEglSupport\5.13.0\QtEglSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtEventDispatcherSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtEventDispatcherSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtEventDispatcherSupport\5.13.0\QtEventDispatcherSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtEventDispatcherSupport\5.13.0\QtEventDispatcherSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtFbSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtFbSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtFbSupport\5.13.0\QtFbSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtFbSupport\5.13.0\QtFbSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtFontDatabaseSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtFontDatabaseSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtFontDatabaseSupport\5.13.0\QtFontDatabaseSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtFontDatabaseSupport\5.13.0\QtFontDatabaseSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtGamepad
-I C:\Qt\5.13.0\mingw73_64\include\QtGamepad\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtGamepad\5.13.0\QtGamepad
-I C:\Qt\5.13.0\mingw73_64\include\QtGamepad\5.13.0\QtGamepad\private
-I C:\Qt\5.13.0\mingw73_64\include\QtGui
-I C:\Qt\5.13.0\mingw73_64\include\QtGui\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtGui\5.13.0\QtGui
-I C:\Qt\5.13.0\mingw73_64\include\QtGui\5.13.0\QtGui\private
-I C:\Qt\5.13.0\mingw73_64\include\QtHelp
-I C:\Qt\5.13.0\mingw73_64\include\QtHelp\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtHelp\5.13.0\QtHelp
-I C:\Qt\5.13.0\mingw73_64\include\QtHelp\5.13.0\QtHelp\private
-I C:\Qt\5.13.0\mingw73_64\include\QtLocation
-I C:\Qt\5.13.0\mingw73_64\include\QtLocation\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtLocation\5.13.0\QtLocation
-I C:\Qt\5.13.0\mingw73_64\include\QtLocation\5.13.0\QtLocation\private
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimedia
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimedia\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimedia\5.13.0\QtMultimedia
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimedia\5.13.0\QtMultimedia\private
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaQuick
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaQuick\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaQuick\5.13.0\QtMultimediaQuick
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaQuick\5.13.0\QtMultimediaQuick\private
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaWidgets
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaWidgets\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaWidgets\5.13.0\QtMultimediaWidgets
-I C:\Qt\5.13.0\mingw73_64\include\QtMultimediaWidgets\5.13.0\QtMultimediaWidgets\private
-I C:\Qt\5.13.0\mingw73_64\include\QtNetwork
-I C:\Qt\5.13.0\mingw73_64\include\QtNetwork\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtNetwork\5.13.0\QtNetwork
-I C:\Qt\5.13.0\mingw73_64\include\QtNetwork\5.13.0\QtNetwork\private
-I C:\Qt\5.13.0\mingw73_64\include\QtNetworkAuth
-I C:\Qt\5.13.0\mingw73_64\include\QtNetworkAuth\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtNetworkAuth\5.13.0\QtNetworkAuth
-I C:\Qt\5.13.0\mingw73_64\include\QtNetworkAuth\5.13.0\QtNetworkAuth\private
-I C:\Qt\5.13.0\mingw73_64\include\QtNfc
-I C:\Qt\5.13.0\mingw73_64\include\QtNfc\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtNfc\5.13.0\QtNfc
-I C:\Qt\5.13.0\mingw73_64\include\QtNfc\5.13.0\QtNfc\private
-I C:\Qt\5.13.0\mingw73_64\include\QtOpenGL
-I C:\Qt\5.13.0\mingw73_64\include\QtOpenGL\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtOpenGL\5.13.0\QtOpenGL
-I C:\Qt\5.13.0\mingw73_64\include\QtOpenGL\5.13.0\QtOpenGL\private
-I C:\Qt\5.13.0\mingw73_64\include\QtOpenGLExtensions
-I C:\Qt\5.13.0\mingw73_64\include\QtPacketProtocol
-I C:\Qt\5.13.0\mingw73_64\include\QtPacketProtocol\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtPacketProtocol\5.13.0\QtPacketProtocol
-I C:\Qt\5.13.0\mingw73_64\include\QtPacketProtocol\5.13.0\QtPacketProtocol\private
-I C:\Qt\5.13.0\mingw73_64\include\QtPlatformCompositorSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtPlatformCompositorSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtPlatformCompositorSupport\5.13.0\QtPlatformCompositorSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtPlatformCompositorSupport\5.13.0\QtPlatformCompositorSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtPlatformHeaders
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioning
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioning\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioning\5.13.0\QtPositioning
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioning\5.13.0\QtPositioning\private
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioningQuick
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioningQuick\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioningQuick\5.13.0\QtPositioningQuick
-I C:\Qt\5.13.0\mingw73_64\include\QtPositioningQuick\5.13.0\QtPositioningQuick\private
-I C:\Qt\5.13.0\mingw73_64\include\QtPrintSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtPrintSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtPrintSupport\5.13.0\QtPrintSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtPrintSupport\5.13.0\QtPrintSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtPurchasing
-I C:\Qt\5.13.0\mingw73_64\include\QtPurchasing\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtPurchasing\5.13.0\QtPurchasing
-I C:\Qt\5.13.0\mingw73_64\include\QtPurchasing\5.13.0\QtPurchasing\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQml
-I C:\Qt\5.13.0\mingw73_64\include\QtQml\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQml\5.13.0\QtQml
-I C:\Qt\5.13.0\mingw73_64\include\QtQml\5.13.0\QtQml\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQmlDebug
-I C:\Qt\5.13.0\mingw73_64\include\QtQmlDebug\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQmlDebug\5.13.0\QtQmlDebug
-I C:\Qt\5.13.0\mingw73_64\include\QtQmlDebug\5.13.0\QtQmlDebug\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuick
-I C:\Qt\5.13.0\mingw73_64\include\QtQuick\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuick\5.13.0\QtQuick
-I C:\Qt\5.13.0\mingw73_64\include\QtQuick\5.13.0\QtQuick\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickControls2
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickControls2\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickControls2\5.13.0\QtQuickControls2
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickControls2\5.13.0\QtQuickControls2\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickParticles
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickParticles\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickParticles\5.13.0\QtQuickParticles
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickParticles\5.13.0\QtQuickParticles\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickShapes
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickShapes\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickShapes\5.13.0\QtQuickShapes
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickShapes\5.13.0\QtQuickShapes\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTemplates2
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTemplates2\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTemplates2\5.13.0\QtQuickTemplates2
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTemplates2\5.13.0\QtQuickTemplates2\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTest
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTest\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTest\5.13.0\QtQuickTest
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickTest\5.13.0\QtQuickTest\private
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickWidgets
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickWidgets\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickWidgets\5.13.0\QtQuickWidgets
-I C:\Qt\5.13.0\mingw73_64\include\QtQuickWidgets\5.13.0\QtQuickWidgets\private
-I C:\Qt\5.13.0\mingw73_64\include\QtRemoteObjects
-I C:\Qt\5.13.0\mingw73_64\include\QtRemoteObjects\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtRemoteObjects\5.13.0\QtRemoteObjects
-I C:\Qt\5.13.0\mingw73_64\include\QtRemoteObjects\5.13.0\QtRemoteObjects\private
-I C:\Qt\5.13.0\mingw73_64\include\QtRepParser
-I C:\Qt\5.13.0\mingw73_64\include\QtScript
-I C:\Qt\5.13.0\mingw73_64\include\QtScript\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtScript\5.13.0\QtScript
-I C:\Qt\5.13.0\mingw73_64\include\QtScript\5.13.0\QtScript\private
-I C:\Qt\5.13.0\mingw73_64\include\QtScriptTools
-I C:\Qt\5.13.0\mingw73_64\include\QtScriptTools\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtScriptTools\5.13.0\QtScriptTools
-I C:\Qt\5.13.0\mingw73_64\include\QtScriptTools\5.13.0\QtScriptTools\private
-I C:\Qt\5.13.0\mingw73_64\include\QtScxml
-I C:\Qt\5.13.0\mingw73_64\include\QtScxml\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtScxml\5.13.0\QtScxml
-I C:\Qt\5.13.0\mingw73_64\include\QtScxml\5.13.0\QtScxml\private
-I C:\Qt\5.13.0\mingw73_64\include\QtSensors
-I C:\Qt\5.13.0\mingw73_64\include\QtSensors\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtSensors\5.13.0\QtSensors
-I C:\Qt\5.13.0\mingw73_64\include\QtSensors\5.13.0\QtSensors\private
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialBus
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialBus\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialBus\5.13.0\QtSerialBus
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialBus\5.13.0\QtSerialBus\private
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialPort
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialPort\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialPort\5.13.0\QtSerialPort
-I C:\Qt\5.13.0\mingw73_64\include\QtSerialPort\5.13.0\QtSerialPort\private
-I C:\Qt\5.13.0\mingw73_64\include\QtSql
-I C:\Qt\5.13.0\mingw73_64\include\QtSql\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtSql\5.13.0\QtSql
-I C:\Qt\5.13.0\mingw73_64\include\QtSql\5.13.0\QtSql\private
-I C:\Qt\5.13.0\mingw73_64\include\QtSvg
-I C:\Qt\5.13.0\mingw73_64\include\QtSvg\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtSvg\5.13.0\QtSvg
-I C:\Qt\5.13.0\mingw73_64\include\QtSvg\5.13.0\QtSvg\private
-I C:\Qt\5.13.0\mingw73_64\include\QtTest
-I C:\Qt\5.13.0\mingw73_64\include\QtTest\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtTest\5.13.0\QtTest
-I C:\Qt\5.13.0\mingw73_64\include\QtTest\5.13.0\QtTest\private
-I C:\Qt\5.13.0\mingw73_64\include\QtTextToSpeech
-I C:\Qt\5.13.0\mingw73_64\include\QtTextToSpeech\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtTextToSpeech\5.13.0\QtTextToSpeech
-I C:\Qt\5.13.0\mingw73_64\include\QtTextToSpeech\5.13.0\QtTextToSpeech\private
-I C:\Qt\5.13.0\mingw73_64\include\QtThemeSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtThemeSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtThemeSupport\5.13.0\QtThemeSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtThemeSupport\5.13.0\QtThemeSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtUiPlugin
-I C:\Qt\5.13.0\mingw73_64\include\QtUiTools
-I C:\Qt\5.13.0\mingw73_64\include\QtUiTools\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtUiTools\5.13.0\QtUiTools
-I C:\Qt\5.13.0\mingw73_64\include\QtUiTools\5.13.0\QtUiTools\private
-I C:\Qt\5.13.0\mingw73_64\include\QtVirtualKeyboard
-I C:\Qt\5.13.0\mingw73_64\include\QtVirtualKeyboard\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtVirtualKeyboard\5.13.0\QtVirtualKeyboard
-I C:\Qt\5.13.0\mingw73_64\include\QtVirtualKeyboard\5.13.0\QtVirtualKeyboard\private
-I C:\Qt\5.13.0\mingw73_64\include\QtVulkanSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtVulkanSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtVulkanSupport\5.13.0\QtVulkanSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtVulkanSupport\5.13.0\QtVulkanSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtWebChannel
-I C:\Qt\5.13.0\mingw73_64\include\QtWebChannel\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtWebChannel\5.13.0\QtWebChannel
-I C:\Qt\5.13.0\mingw73_64\include\QtWebChannel\5.13.0\QtWebChannel\private
-I C:\Qt\5.13.0\mingw73_64\include\QtWebSockets
-I C:\Qt\5.13.0\mingw73_64\include\QtWebSockets\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtWebSockets\5.13.0\QtWebSockets
-I C:\Qt\5.13.0\mingw73_64\include\QtWebSockets\5.13.0\QtWebSockets\private
-I C:\Qt\5.13.0\mingw73_64\include\QtWidgets
-I C:\Qt\5.13.0\mingw73_64\include\QtWidgets\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtWidgets\5.13.0\QtWidgets
-I C:\Qt\5.13.0\mingw73_64\include\QtWidgets\5.13.0\QtWidgets\private
-I C:\Qt\5.13.0\mingw73_64\include\QtWindowsUIAutomationSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtWindowsUIAutomationSupport\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtWindowsUIAutomationSupport\5.13.0\QtWindowsUIAutomationSupport
-I C:\Qt\5.13.0\mingw73_64\include\QtWindowsUIAutomationSupport\5.13.0\QtWindowsUIAutomationSupport\private
-I C:\Qt\5.13.0\mingw73_64\include\QtWinExtras
-I C:\Qt\5.13.0\mingw73_64\include\QtWinExtras\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtWinExtras\5.13.0\QtWinExtras
-I C:\Qt\5.13.0\mingw73_64\include\QtWinExtras\5.13.0\QtWinExtras\private
-I C:\Qt\5.13.0\mingw73_64\include\QtXml
-I C:\Qt\5.13.0\mingw73_64\include\QtXml\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtXml\5.13.0\QtXml
-I C:\Qt\5.13.0\mingw73_64\include\QtXml\5.13.0\QtXml\private
-I C:\Qt\5.13.0\mingw73_64\include\QtXmlPatterns
-I C:\Qt\5.13.0\mingw73_64\include\QtXmlPatterns\5.13.0
-I C:\Qt\5.13.0\mingw73_64\include\QtXmlPatterns\5.13.0\QtXmlPatterns
-I C:\Qt\5.13.0\mingw73_64\include\QtXmlPatterns\5.13.0\QtXmlPatterns\private}}

qtdoctools-main.qdocconf only contains the path to ActiveQt's qdocconf:

C:\Qt\5.13.0\Src\qtactiveqt\src\activeqt\doc\activeqt.qdocconf

The debug output is not really different between WebXML and HTML, I still attach them, just in case. I see a lot of errors from Clang, signalling methods that are redefined (with messages such as /fn_dummyfile.cpp:1:18: error: redefinition of 'generateDocumentation'), but I guess it's just because there is an inline definition in the header file and just the doc in the CPP file.