Qt5::Help CMake target fails on Ubuntu 22.04.1 LTS

[rayment]

Update: Can confirm same problem when using x86_64-w64-mingw32.shared.

I have successfully built qtbase and qttools, and then qt5 after noticing the error on a brand-new Ubuntu 22.04.1 LTS virtual machine by running the following commands:

git clone https://github.com/mxe/mxe
cd mxe
make qtbase qtools qt5 -j9 MXE_TARGETS='x86_64-w64-mingw32.static'

When I try to build my project with the bundled CMake:

cd ~/project
mkdir build
cd build
PATH=$PATH:/home/finn/mxe/usr/bin
x86_64-w64-mingw32.static-cmake -DCMAKE_BUILD_TYPE=Release ../CMakeLists.txt

I get the following output:

== Using MXE wrapper: /home/finn/mxe/usr/bin/x86_64-w64-mingw32.static-cmake
     - cmake version 3.26.3
     - warnings for unused CMAKE_POLICY_DEFAULT variables can be ignored
== Using MXE toolchain: /home/finn/mxe/usr/x86_64-w64-mingw32.static/share/cmake/mxe-conf.cmake
== Using MXE runresult: /home/finn/mxe/usr/share/cmake/modules/TryRunResults.cmake
loading initial cache file /home/finn/mxe/usr/share/cmake/modules/TryRunResults.cmake
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
CMake Error at /home/finn/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/cmake/Qt5Help/Qt5HelpConfig.cmake:14 (message):
  The imported target "Qt5::Help" references the file

     "/home/finn/mxe/usr/x86_64-w64-mingw32.static/qt5/bin/qcollectiongenerator"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     "/home/finn/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/cmake/Qt5Help/Qt5HelpConfigExtras.cmake"

  but not all the files it references.

Call Stack (most recent call first):
  /home/finn/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/cmake/Qt5Help/Qt5HelpConfigExtras.cmake:6 (_qt5_Help_check_file_exists)
  /home/finn/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/cmake/Qt5Help/Qt5HelpConfig.cmake:407 (include)
  /home/finn/mxe/usr/x86_64-w64-mingw32.static/qt5/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package)
  CMakeLists.txt:38 (find_package)

We shouldn't need to include either qcollectiongenerator or qhelpgenerator as the cross-compilation negates their usefulness.

Here is my CMakelists.txt:

cmake_minimum_required(VERSION 3.26)

set(VERSION_MAJOR 1)
set(VERSION_MINOR 0)
set(VERSION_PATCH 0)
set(COPYRIGHT 2023)

project(piper
        VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}
        LANGUAGES CXX)

set(CMAKE_INSTALL_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/dist)
set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_AUTOUIC_SEARCH_PATHS src)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

if (UNIX AND NOT APPLE)
	set(LINUX TRUE)
endif()

if (WIN32 OR MSVC OR MSYS OR MINGW)
	set(CMAKE_PREFIX_PATH $ENV{QTDIR})
	set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS
	             $<$<CONFIG:RELWITHDEBINFO>:QT_MESSAGELOGCONTEXT
	)
endif()

find_package(QT
             NAMES Qt5 Qt6
             REQUIRED COMPONENTS Core Widgets Help PrintSupport)
find_package(Qt${QT_VERSION_MAJOR}
             NAMES Qt5 Qt6
             REQUIRED COMPONENTS Core Widgets Help PrintSupport)

file(GLOB_RECURSE PROJECT_SOURCES CONFIGURE_DEPENDS
     "src/*"
     "*/*.qrc"
)

if (${QT_VERSION_MAJOR} GREATER_EQUAL 6)
	qt_add_executable(
		${PROJECT_NAME}
	    MANUAL_FINALIZATION
	    ${PROJECT_SOURCES}
	)
else()
	add_executable(
		${PROJECT_NAME}
	    ${PROJECT_SOURCES}
	)
endif()

# force Qt error if using unoptimised string operations
target_compile_options(
    ${PROJECT_NAME} PRIVATE
    "-DQT_NO_CAST_FROM_ASCII"
    "-DQT_NO_CAST_TO_ASCII"
    "-DQT_NO_CAST_FROM_BYTEARRAY"
    "-DQT_NO_URL_CAST_FROM_STRING"
    "-DQT_USE_QSTRINGBUILDER"
)

target_compile_definitions(
    ${PROJECT_NAME} PRIVATE
    PROJECT_NAME="Piper"
    VERSION_MAJOR=${VERSION_MAJOR}
    VERSION_MINOR=${VERSION_MINOR}
    VERSION_PATCH=${VERSION_PATCH}
    COPYRIGHT=${COPYRIGHT}
)

if(MSVC)
	target_compile_options(
		${PROJECT_NAME} PRIVATE
		/W4
	)
else()
	target_compile_options(
		${PROJECT_NAME} PRIVATE
		-Wall -Wextra
		-fdiagnostics-show-option
	)
endif()

target_link_libraries(
	${PROJECT_NAME} PRIVATE
	Qt${QT_VERSION_MAJOR}::Core
	Qt${QT_VERSION_MAJOR}::Widgets
	Qt${QT_VERSION_MAJOR}::Help
	Qt${QT_VERSION_MAJOR}::PrintSupport
)

add_subdirectory(contrib/Qt-Advanced-Docking-System)
add_subdirectory(contrib/nodeeditor)
include_directories(
	contrib/Qt-Advanced-Docking-System/src
	contrib/nodeeditor/include
)
target_link_libraries(
	${PROJECT_NAME} PRIVATE
	qt${QT_VERSION_MAJOR}advanceddocking
	QtNodes
)

set_target_properties(
	${PROJECT_NAME} PROPERTIES
	MACOSX_BUNDLE_DUI_IDENTIFIER ${PROJECT_NAME}.rayment.fr
	MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
	MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
	MACOSX_BUNDLE TRUE
	WIN32_EXECUTABLE TRUE
)

install(TARGETS ${PROJECT_NAME}
        BUNDLE DESTINATION src
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

if (QT_VERSION_MAJOR GREATER_EQUAL 6)
	qt_finalize_executable(${PROJECT_NAME})
endif()

file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/docs/gen/help.qch
     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/docs/gen/help.qhc
     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})

Environment:

$ uname -a
Linux ubuntu-dev-server 5.15.0-73-generic #80-Ubuntu SMP Mon May 15 15:18:26 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy