修改CMakeLists.txt使CLion识别本地Qt6以运行CGAL Qt6 Demo

问题背景 #

• 基于CLion + vcpkg开发，已通过C:\dev\vcpkg> .\vcpkg.exe install qt5安装Qt5，可正常运行部分CGAL Demo，但依赖Qt6的Demo（如Hyperbolic_triangulation_2）无法编译
• vcpkg暂未提供Qt6包，已手动安装MSVC2019 64位版Qt6至C:\Qt\6.7.2\msvc2019_64
• 需要配置CMake使其找到手动安装的Qt6，或修改Demo自带的CMakeLists.txt

解决方案 #

方法1：CLion配置CMake参数（推荐，无需修改代码） #

1. 打开CLion，进入项目设置：File > Settings > Build, Execution, Deployment > CMake
2. 在CMake options输入框中添加Qt6路径配置：

   -DCMAKE_PREFIX_PATH=C:\Qt\6.7.2\msvc2019_64
   

3. 确认CLion使用的工具链为MSVC2019 64位（Settings > Build, Execution, Deployment > Toolchains），与Qt6版本匹配
4. 点击Apply后重新加载CMake项目，CMake即可识别到Qt6

方法2：修改Demo的CMakeLists.txt #

直接在CMakeLists.txt开头添加Qt6的配置路径提示，修改后的完整代码如下：

cmake_minimum_required(VERSION 3.12...3.29)
project(Hyperbolic_triangulation_2_Demo)

# 指定Qt6的CMake配置文件路径，帮助CMake定位Qt6
set(Qt6_DIR "C:/Qt/6.7.2/msvc2019_64/lib/cmake/Qt6")

# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)

find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Core Qt6)
find_package(LEDA QUIET)

# 查找Qt6 Widgets组件，改为REQUIRED以便排查定位失败问题
find_package(Qt6 REQUIRED COMPONENTS Widgets)

if(CGAL_Qt6_FOUND
        AND Qt6_FOUND
        AND (CGAL_Core_FOUND OR LEDA_FOUND))

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

    qt_add_executable ( HDT2 HDT2.cpp HDT2.ui resources/Delaunay_triangulation_2.qrc
            include/internal/Qt/HyperbolicPainterOstreamCK.h
            include/internal/Qt/TriangulationGraphicsItemWithColorInfo.h
            include/internal/Qt/TriangulationMovingPoint.h
            include/internal/Qt/TriangulationRemoveVertex.h)
    target_include_directories(HDT2 PRIVATE ./ ./include)
    add_to_cached_list( CGAL_EXECUTABLE_TARGETS HDT2 )
    target_link_libraries ( HDT2 PRIVATE CGAL::CGAL CGAL::CGAL_Qt6 Qt6::Widgets)
    if(CGAL_Core_FOUND)
        target_link_libraries ( HDT2 PRIVATE CGAL::CGAL_Core)
    else()
        target_link_libraries ( HDT2 PRIVATE ${LEDA_LIBRARIES})
    endif()

    include(${CGAL_MODULES_DIR}/CGAL_add_test.cmake)
    cgal_add_compilation_test( HDT2 )
else()
    message("NOTICE: This demo requires CGAL_Core (or LEDA), and Qt6 and will not be compiled.")
endif()

修改说明

• 新增set(Qt6_DIR ...)：直接指定Qt6的CMake配置文件所在路径，这是CMake定位Qt6的核心步骤
• 将find_package(Qt6 QUIET ...)改为REQUIRED：若Qt6定位失败会直接抛出错误，便于快速排查问题，而非静默跳过

注意事项 #

• 确保vcpkg使用的编译器与Qt6版本一致（均为MSVC2019 64位），避免编译链接错误
• CGAL 5.6.1已支持Qt6，无需额外升级CGAL
• 无需让vcpkg识别手动安装的Qt6，直接通过CMake配置定位即可，vcpkg继续管理CGAL等其他依赖

内容的提问来源于stack exchange，提问作者Traubenzucker