CMake 在 Qt6 安装中找不到包

问题描述 投票：0回答：5

我正在尝试通过 CMake 构建项目，并将环境变量 

Qt6_DIR
设置为包含 
Qt6Config.cmake
的目录。

但是，构建似乎无法在 Qt6 安装中找到它所需的任何其他依赖项，我不确定下一步需要做什么。

我看到对其他可能的环境变量的引用，例如

Qt6CoreTools_DIR
，我想知道我是否真的需要独立设置每个环境变量，或者是否有一个包含需要正确链接的信息的工具链。

-- GUI Frontend: Qt6
CMake Warning at C:/Program Files/CMake/share/cmake-3.20/Modules/CMakeFindDependencyMacro.cmake:47 (find_package):
  By not providing "FindQt6CoreTools.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "Qt6CoreTools", but CMake did not find one.

  Could not find a package configuration file provided by "Qt6CoreTools"
  (requested version 6.2.3) with any of the following names:

    Qt6CoreToolsConfig.cmake
    qt6coretools-config.cmake

  Add the installation prefix of "Qt6CoreTools" to CMAKE_PREFIX_PATH or set
  "Qt6CoreTools_DIR" to a directory containing one of the above files.  If
  "Qt6CoreTools" provides a separate development package or SDK, be sure it
  has been installed.
Call Stack (most recent call first):
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6WidgetsTools/Qt6WidgetsToolsDependencies.cmake:9 (find_dependency)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6WidgetsTools/Qt6WidgetsToolsConfig.cmake:34 (include)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Widgets/Qt6WidgetsDependencies.cmake:71 (find_package)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake:40 (include)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package)
  src/CMakeLists.txt:22 (find_package)


CMake Warning at C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Widgets/Qt6WidgetsDependencies.cmake:71 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6WidgetsTools/Qt6WidgetsToolsConfig.cmake

  but it set Qt6WidgetsTools_FOUND to FALSE so package "Qt6WidgetsTools" is
  considered to be NOT FOUND.  Reason given by package:

  Qt6WidgetsTools could not be found because dependency Qt6CoreTools could
  not be found.

Call Stack (most recent call first):
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake:40 (include)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package)
  src/CMakeLists.txt:22 (find_package)


CMake Warning at C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake

  but it set Qt6Widgets_FOUND to FALSE so package "Qt6Widgets" is considered
  to be NOT FOUND.  Reason given by package:

  Target "Qt6::Widgets" was not found.

Call Stack (most recent call first):
  src/CMakeLists.txt:22 (find_package)


-- Could NOT find WrapVulkanHeaders (missing: Vulkan_INCLUDE_DIR)
-- Could NOT find Qt6CoreTools (missing: Qt6CoreTools_DIR)
CMake Warning at C:/Program Files/CMake/share/cmake-3.20/Modules/CMakeFindDependencyMacro.cmake:47 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Core/Qt6CoreConfig.cmake

  but it set Qt6Core_FOUND to FALSE so package "Qt6Core" is considered to be
  NOT FOUND.  Reason given by package:

  Target "Qt6::Core" was not found.

Call Stack (most recent call first):
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:14 (find_dependency)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLDependencies.cmake:91 (_qt_internal_find_dependencies)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLConfig.cmake:40 (include)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package)
  src/CMakeLists.txt:22 (find_package)


CMake Warning at C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLConfig.cmake

  but it set Qt6OpenGL_FOUND to FALSE so package "Qt6OpenGL" is considered to
  be NOT FOUND.  Reason given by package:

  Qt6OpenGL could not be found because dependency Qt6Core could not be found.

Call Stack (most recent call first):
  src/CMakeLists.txt:22 (find_package)


-- Could NOT find WrapVulkanHeaders (missing: Vulkan_INCLUDE_DIR)
-- Could NOT find Qt6CoreTools (missing: Qt6CoreTools_DIR)
CMake Warning at C:/Program Files/CMake/share/cmake-3.20/Modules/CMakeFindDependencyMacro.cmake:47 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Core/Qt6CoreConfig.cmake

  but it set Qt6Core_FOUND to FALSE so package "Qt6Core" is considered to be
  NOT FOUND.  Reason given by package:

  Target "Qt6::Core" was not found.

Call Stack (most recent call first):
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:14 (find_dependency)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLDependencies.cmake:91 (_qt_internal_find_dependencies)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLConfig.cmake:40 (include)
  C:/Program Files/CMake/share/cmake-3.20/Modules/CMakeFindDependencyMacro.cmake:47 (find_package)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:14 (find_dependency)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGLWidgets/Qt6OpenGLWidgetsDependencies.cmake:91 (_qt_internal_find_dependencies)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGLWidgets/Qt6OpenGLWidgetsConfig.cmake:40 (include)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package)
  src/CMakeLists.txt:22 (find_package)


CMake Warning at C:/Program Files/CMake/share/cmake-3.20/Modules/CMakeFindDependencyMacro.cmake:47 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLConfig.cmake

  but it set Qt6OpenGL_FOUND to FALSE so package "Qt6OpenGL" is considered to
  be NOT FOUND.  Reason given by package:

  Qt6OpenGL could not be found because dependency Qt6Core could not be found.

Call Stack (most recent call first):
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:14 (find_dependency)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGLWidgets/Qt6OpenGLWidgetsDependencies.cmake:91 (_qt_internal_find_dependencies)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGLWidgets/Qt6OpenGLWidgetsConfig.cmake:40 (include)
  C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package)
  src/CMakeLists.txt:22 (find_package)


CMake Warning at C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake:177 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGLWidgets/Qt6OpenGLWidgetsConfig.cmake

  but it set Qt6OpenGLWidgets_FOUND to FALSE so package "Qt6OpenGLWidgets" is
  considered to be NOT FOUND.  Reason given by package:

  Qt6OpenGLWidgets could not be found because dependency Qt6OpenGL could not
  be found.

Call Stack (most recent call first):
  src/CMakeLists.txt:22 (find_package)


CMake Error at src/CMakeLists.txt:22 (find_package):
  Found package configuration file:

    C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6/Qt6Config.cmake

  but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
  FOUND.  Reason given by package:

  Failed to find Qt component "Widgets".

  Expected Config file at
  "C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake" exists

  Failed to find Qt component "OpenGL".

  Expected Config file at
  "C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGL/Qt6OpenGLConfig.cmake" exists

  Failed to find Qt component "OpenGLWidgets".

  Expected Config file at
  "C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6OpenGLWidgets/Qt6OpenGLWidgetsConfig.cmake"
  exists
c++ windows qt cmake qt6
5个回答
9
投票

Qt≥6.4.2

使用 

-DQt6_DIR=~/Qt/6.5.0/gcc_64/lib/cmake/Qt6

运行 cmake

Qt< 6.4.2

将此添加到您的根 CMakeLists.txt。

list(APPEND CMAKE_PREFIX_PATH "~/Qt/6.3.0/gcc_64")

根据需要更改路径。

或者，您可以将其设置为环境变量。

export PATH="~/Qt/6.3.0/gcc_64/:$PATH"

搜索标准系统环境变量。如果传递 NO_SYSTEM_ENVIRONMENT_PATH 或将 CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH 设置为 FALSE，则可以跳过此操作。以 /bin 或 /sbin 结尾的路径条目会自动转换为其父目录：

  • 路径

参考资料：

CMake 

find_package()
搜索路径

cmake 特定的缓存变量中指定的搜索路径。这些旨在通过 -DVAR=VALUE 在命令行上使用。这些值被解释为以分号分隔的列表。如果传递 NO_CMAKE_PATH 或将 CMAKE_FIND_USE_CMAKE_PATH 设置为 FALSE，则可以跳过此操作：

  • CMAKE_PREFIX_PATH
  • CMAKE_FRAMEWORK_PATH
  • CMAKE_APPBUNDLE_PATH

CMAKE_PREFIX_PATH：

FIND_XXX() 用于搜索的路径，并添加适当的后缀。 指定 FIND_XXX() 命令将使用的路径。它包含“基”目录，FIND_XXX() 命令将适当的子目录附加到基目录。因此 FIND_PROGRAM() 将 /bin 添加到路径中的每个目录，FIND_LIBRARY() 将 /lib 添加到每个目录，FIND_PATH() 和 FIND_FILE() 将 /include 添加。默认情况下它是空的，它是由项目设置的。另请参阅 CMAKE_SYSTEM_PREFIX_PATH、CMAKE_INCLUDE_PATH、CMAKE_LIBRARY_PATH、CMAKE_PROGRAM_PATH。 

QT BUG [97615]

7
投票

根据 QTBUG-97615，不支持使用单个 

Qt6_DIR
配置构建的正确支持（还？），配置应用程序构建的“官方”方法是使用 
CMAKE_PREFIX_PATH
（如建议的那样）其他答案）。
但是，如果您的工具不能轻松支持此类方法（例如 VisualStudio/VSCode），则有一种针对这种情况的解决方法（我在挖掘 Qt6 的混乱 cmake 脚本时发现了它）。
您可以使用 
QT_ADDITIONAL_PACKAGES_PREFIX_PATH
来指定 Qt 根（以及 
Qt6_DIR
来最初挂钩它）。
命令行将如下所示（只是为了说明方法）：
cmake -DQt6_DIR:PATH=C:/Qt6/6.2.3/mingw_64/lib/cmake/Qt6 -DQT_ADDITIONAL_PACKAGES_PREFIX_PATH=C:/Qt6/6.2.3/mingw_64 ..

这两个变量都可以通过 VisualStudio/VSCode 中的 UI 轻松配置。
快乐建设！ :)

4
投票

由于我在评论中看到一些人专门询问 VS(-Code) 设置/配置，因此以下内容在 Windows 上对我有用：

我将 

CMAKE_PREFIX_PATH
设置为 
C:/Qt/6.4.2/msvc2019_64
（将 
C:/Qt/6.4.2
替换为您的 Qt 安装路径和版本）。 注意：对于 Qt 5，您可以使用 
[..]/msvc2019_64/lib/cmake
，这不再适用于 Qt 6 。如果您需要 
CMAKE_PREFIX_PATH
中的多个路径，请用分号 (
;
) 将它们连接起来。

示例 

.vscode/settings.json
可能如下所示：

{
  "cmake.configureSettings": {
    "CMAKE_PREFIX_PATH": "C:/Qt/6.4.2/msvc2019_64"
  }
}
2
投票

来自 Qt 文档：

您可以通过不同的方式告诉 CMake 有关 Qt 的信息，但最常见和推荐的方法是设置 CMake 缓存变量 CMAKE_PREFIX_PATH 以包含 Qt 6 安装前缀。

因此您应该将 C:/Qt6/6.2.3/mingw_64/ 添加到 CMAKE_PREFIX_PATH 以分号分隔的列表中。

0
投票

您可以检查

CMAKE_PREFIX_PATH
是否由项目提供的cmake脚本之一设置或修改。

我在 Linux 操作系统上的另一个项目中遇到了同样的问题，最终似乎有效的方法是将名为 

QT_PREFIX
的项目特定变量设置为 
/opt/Qt/6.2.4/gcc_64/
。

通过查看项目的文件 

CMakeLists_Dependencies.cmake
我注意到 
CMAKE_PREFIX_PATH
是由脚本设置的，如下所示： 
set(CMAKE_PREFIX_PATH "${QT_PREFIX}/lib/cmake")
。 我的猜测是，这个语句掩盖了我在命令行中对 
CMAKE_PREFIX_PATH
的定义。

我通过在

message(CMAKE_PREFIX_PATH="${CMAKE_PREFIX_PATH}")
下方插入语句
set(CMAKE_PREFIX_PATH "${QT_PREFIX}/lib/cmake")
来检查它。

当not设置

QT_PREFIX
时，无论我是否在命令行中包含
CMAKE_PREFIX_PATH="/lib/cmake"
，输出都是
-DCMAKE_PREFIX_PATH=…
。 （在我的例子中
/lib/cmake/
是不是有效的路径。）

如果按上述方式设置 

QT_DIR
，则输出为 
CMAKE_PREFIX_PATH="/opt/Qt/6.2.4/gcc_64//lib/cmake"
，这使得 cmake 能够找到该目录，即使有双斜杠也是如此。

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