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Details

Type: Bug
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 6.4.2
Component/s: Build System: CMake
Labels:
- cmake_upstream

Commits:
4e70ab5ee (dev), 15cfb9392 (dev), 4a71a001a (tqtc/lts-6.5)

Description

Upstream issue: https://gitlab.kitware.com/cmake/cmake/-/issues/25195

Project

cmake_minimum_required(VERSION 3.16)
if(CMAKE_GENERATOR STREQUAL "Ninja Multi-Config")
    set(CMAKE_CROSS_CONFIGS "all" CACHE STRING "")
    set(CMAKE_DEFAULT_BUILD_TYPE "RelWithDebInfo" CACHE STRING "")
    set(CMAKE_DEFAULT_CONFIGS "all" CACHE STRING "")
endif()
project(proj LANGUAGES CXX)

find_package(Qt6 REQUIRED COMPONENTS Core Gui)

set(CMAKE_AUTOUIC ON)
add_executable(app
    foo.cpp
    ../problematic.ui
    regular.ui
)

#set_property(TARGET "app"
#PROPERTY EXCLUDE_FROM_ALL "$<NOT:$<CONFIG:RelWithDebInfo>>")

Configure

qt-cmake .. "-DCMAKE_CONFIGURATION_TYPES=RelWithDebInfo;Debug" "-GNinja Multi-Config"

Build

$ ninja
ninja: error: 'app_autogen/include_Debug/ui_regular.h', needed by 'app_autogen:Debug', missing and no known rule to make it

Discovered and refined to the above reproducer, while investigating a failure on Windows when trying to build examples as external projects.

https://codereview.qt-project.org/c/qt/qt5/+/431085/2#message-a4a1d14fbe9e2d70cd2cd50df17ec80702ca27ba

https://testresults.qt.io/coin/integration/qt/qt5/tasks/web_qt_qt5_1667580188137

https://testresults.qt.io/coin/logview/qt/qttools/f86d45fd6b83dd60863aaa6a68bcc8525eabca07/WindowsWindows_10_21H2x86_64WindowsWindows_10_21H2x86_64MSVC2019qtci-windows-10_21H2-x86_64-51-a209fdConan_DebugAndRelease_Sccache_UseConfigure_WarningsAreErrors/f0700752a0d6879a20dcf362533810bcfe4ad5f0/build_1679375462

agent:2022/11/04 20:23:10 build.go:394: ninja: error: 'src/designer/src/designer/designer_autogen/include_Debug/ui_preferencesdialog.h', needed by 'src/designer/src/designer/designer_autogen:Debug', missing and no known rule to make it

The way it's triggered in qttools is due to all example external projects depending on all targets in $repo/src, qttools has the designer app which refers to ../../../shared/qttoolbardialog/qttoolbardialog.ui
preferencesdialog.ui

When examples are not built, the problem does not trigger because qt_internal_add_app does

set_property(TARGET "${name}"
            PROPERTY EXCLUDE_FROM_ALL "$<NOT:$<CONFIG:${QT_MULTI_CONFIG_FIRST_CONFIG}>>")

and the debug variant of the executable is not built.

But with examples building on, an add_dependencies call between an external project custom target and the designer app target forces a dependency on all variants of the app, including debug.