How can I set extra, custom arguments for androiddeployqt via CMakeLists.txt?

Is it possible to append an argument to the androiddeployqt call via CMakeLists.txt (Qt 6.4+)?

Looking at the source code, I think the answer is currently no. At the time of this writing, the latest version of the Android/Androiddeployqt.cmake file works like this:

> cmake
> # create a custom command that will run the androiddeployqt utility to generate the APK
> add_custom_target(
> apk
> DEPENDS ${ARG_TARGET}
> COMMAND ${CMAKE_COMMAND} -E remove_directory ${CMAKE_CURRENT_BINARY_DIR}/libs/${ANDROID_ABI} # it seems that recompiled libraries are not copied if we don't remove them first
> COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/libs/${ANDROID_ABI}
> COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:${ARG_TARGET}> ${CMAKE_CURRENT_BINARY_DIR}/libs/${ANDROID_ABI}
> COMMAND ${ANDROID_DEPLOY_QT} $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose> --output ${CMAKE_CURRENT_BINARY_DIR} --input ${CMAKE_CURRENT_BINARY_DIR}/qtdeploy.json $<$<CONFIG:Debug>:--no-strip> $<$<CONFIG:RelWithDebInfo>:--no-strip> $<$<CONFIG:Release>:--release> $<$<CONFIG:RelWithDebInfo>:--release> $<$<CONFIG:MinSizeRel>:--release> --no-generated-assets-cache --jdk ${JAVA_HOME_DIR} --gradle ${TARGET_LEVEL_OPTIONS} ${SIGN_OPTIONS}
> )
>
> # create a custom command that will install the APK on a connected android device
> add_custom_target(
> apk-install
> DEPENDS apk
> COMMAND ${ANDROID_DEPLOY_QT} $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose> --no-build --reinstall --output ${CMAKE_CURRENT_BINARY_DIR} --input ${CMAKE_CURRENT_BINARY_DIR}/qtdeploy.json $<$<CONFIG:Debug>:--no-strip> $<$<CONFIG:RelWithDebInfo>:--no-strip> $<$<CONFIG:Release>:--release> $<$<CONFIG:RelWithDebInfo>:--release> $<$<CONFIG:MinSizeRel>:--release> --no-generated-assets-cache --jdk ${JAVA_HOME_DIR} --gradle ${TARGET_LEVEL_OPTIONS} ${SIGN_OPTIONS}
> )
>

I don't see any points for adding extra things. SIGN_OPTIONS does not look to be a free configuration point. You can create an issue ticket requesting such functionality and explaining why it would be useful. If you do, please comment under this answer with a link to that issue ticket for posterity. The only other option you have if you don't want to do that, or need to make such changes urgently, is to patch the Android/Androiddeployqt.cmake yourself.