Difficulties creating CMake project using existing source files

[Perdrix]

I've created a CMakeLists.txt for one of my projects:

# Require C++20 and disable extensions for all targets.
# NOTE: See further below for how to do this more robustly.
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

set(CMAKE_PREFIX_PATH
	"C:/Qt/6.8.0/msvc2022_64"
	CACHE STRING "" FORCE
	)
	
set(PROJECT_NAME DeepSkyStacker)

set(COMPILE_WARNING_AS_ERROR YES)

find_package(Qt6 6.8 REQUIRED COMPONENTS Gui Widgets Network Charts)
qt_standard_project_setup()

  :
  :

set(Ui_Files
	"./ui/About.ui"
	"./ui/AlignmentParameters.ui"
	"./ui/AskRegistering.ui"
	"./ui/BackgroundOptions.ui"
	"./ui/BatchStacking.ui"
	"./ui/CheckAbove.ui"
	"./ui/CometStacking.ui"
	"./ui/DropFilesDlg.ui"
	"./ui/ExplorerBar.ui"
	"./ui/ImageProperties.ui"
	"./ui/IntermediateFiles.ui"
	"./ui/OutputTab.ui"
	"./ui/PictureList.ui"
	"./ui/PostCalibration.ui"
	"./ui/ProcessingControls.ui"
	"./ui/ProcessingDlg.ui"
	"./ui/ProcessingSettingsDlg.ui"
	"./ui/ProgressDlg.ui"
	"./ui/RawDDPSettings.ui"
	"./ui/RecommendedSettings.ui"
	"./ui/RegisterSettings.ui"
	"./ui/RenameGroup.ui"
	"./ui/resources.qrc"	
	"./ui/ResultParameters.ui"
	"./ui/SaveEditChanges.ui"
	"./ui/StackingDlg.ui"
	"./ui/StackingParameters.ui"
	"./ui/StackRecap.ui"
	"./ui/StackSettings.ui"
	"./ui/StarMaskDlg.ui"
	)
	
source_group("Qt\\ui" FILES ${Ui_Files})

set(i18n_Files
	"./i18n/DSS_ca.ts"
	"./i18n/DSS_cs.ts"
	"./i18n/DSS_de.ts"
	"./i18n/DSS_en.ts"
	"./i18n/DSS_es.ts"
	"./i18n/DSS_fr.ts"
	"./i18n/DSS_it.ts"
	"./i18n/DSS_ja_JP.ts"
	"./i18n/DSS_nl.ts"
	"./i18n/DSS_pt_BR.ts"
	"./i18n/DSS_ro.ts"
	"./i18n/DSS_ru.ts"
	"./i18n/DSS_tr.ts"
	"./i18n/DSS_zh_CN.ts"
	"./i18n/DSS_zh_TW.ts"
	"./i18n/translations.qrc"
	)
	
source_group("Qt\\i18n" FILES ${i18n_Files})

set(Tools
    "../Tools/imageview.cpp"
    "../Tools/QElidedLabel.cpp"
    "../Tools/QLinearGradientCtrl.cpp"
)
source_group("Tools" FILES ${Tools})

set(ALL_FILES
    ${Dialogs}
    ${Dialogs__Processing}
    ${Dialogs__Registering}
    ${Dialogs__Settings}
    ${Dialogs__Stacking}
    ${Header_Files}
	${Ui_Files}
	${i18n_Files}
    ${Source_Files}
    ${Tools}
)

################################################################################
# Target
################################################################################
qt_add_executable(DeepSkyStacker ${ALL_FILES})

If I run CMake configure that works OK, but when I try to run generate I get:

CMake Error at C:/Qt/6.8.0/msvc2022_64/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:703 (add_executable):
  Cannot find source file:

    C:/Users/amonra/Documents/GitHub/DSS/build/DeepSkyStacker/ui/resources.qrc

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm
  .ccm .cxxm .c++m .h .hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90
  .f95 .f03 .hip .ispc
Call Stack (most recent call first):
  C:/Qt/6.8.0/msvc2022_64/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:644 (_qt_internal_create_executable)
  C:/Qt/6.8.0/msvc2022_64/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:957 (qt6_add_executable)
  DeepSkyStacker/CMakeLists.txt:167 (qt_add_executable)

Why is it looking under the build directory for that file when all the other files are searched for and found under C:/Users/amonra/Documents/GitHub/DSS/DeepSkyStacker?

Clearly I did something wrong ... but what?

[ChrisW67]

Does your CMakeLists.txt invoke (directly or indirectly):

set(CMAKE_AUTORCC ON)

[Perdrix]

I found my error, the file was indeed correctly reported as "not found" (it was up one level in the heirarchy).

But it wasn't in the build tree (even though the error message suggested it was/should have been)?????