fix: cmake error about WaylandClientPrivate not found

[felixonmars]

Fixes the following error on Arch:

CMake Error at src/dbus/CMakeLists.txt:31 (target_link_libraries):
  Target "dde_am_dbus" links to:

    Qt::WaylandClientPrivate

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.



-- Generating done (0.1s)
CMake Generate step failed.  Build files cannot be regenerated correctly.

Summary by Sourcery

Build:

• Update Qt6 find_package components list to include WaylandClientPrivate so CMake can resolve the dde_am_dbus linkage.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Extends the Qt6 CMake dependency list to explicitly require the private Wayland client component so that the dde_am_dbus target can link against Qt::WaylandClientPrivate without configuration failures on systems like Arch.

File-Level Changes

Change	Details	Files
Ensure CMake finds the Qt::WaylandClientPrivate target required by the dbus module.	Add WaylandClientPrivate to the list of required Qt6 components in the top-level find_package(Qt6 ...) call so CMake defines the Qt::WaylandClientPrivate target. Leave all other CMake configuration, dependencies, and options unchanged to minimize impact.	CMakeLists.txt

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since WaylandClientPrivate is a private Qt module that may not be present or exported in all Qt builds, consider making this dependency optional (e.g., using find_package(Qt6 COMPONENTS WaylandClientPrivate QUIET) plus a feature toggle) or gating the code that uses it behind a CMake option to avoid hard build failures on platforms without this target.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since `WaylandClientPrivate` is a private Qt module that may not be present or exported in all Qt builds, consider making this dependency optional (e.g., using `find_package(Qt6 COMPONENTS WaylandClientPrivate QUIET)` plus a feature toggle) or gating the code that uses it behind a CMake option to avoid hard build failures on platforms without this target.

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[deepin-ci-robot]

deepin pr auto review

这段代码在 CMake 构建脚本中添加了对 Qt 6.10 及以上版本中 WaylandClientPrivate 组件的条件查找。以下是对该代码的审查意见，涵盖语法逻辑、代码质量、性能和安全性四个方面：

1. 语法逻辑

• 版本判断逻辑：if(Qt6_VERSION VERSION_GREATER_EQUAL 6.10) 的写法在 CMake 中是标准的版本比较语法，逻辑上是正确的。它确保了只有在 Qt 6.10 或更高版本时才会尝试查找私有模块。
• 依赖声明位置：将条件依赖放在公共依赖 find_package(Qt6 ...) 之后是合理的，因为 Qt6_VERSION 变量只有在执行了 find_package(Qt6 ...) 后才会被定义。

2. 代码质量

• 私有模块的使用：代码引入了 WaylandClientPrivate。通常情况下，Qt 的私有模块（如 *Private）是不稳定的，其 API 可能在未来的 Qt 版本中发生变化。建议确认是否真的必须使用该私有模块。如果是，请确保代码中有相应的版本宏保护，以便在未来 API 变更时能够快速定位和修复。
• 缺失版本兼容性处理：代码仅处理了 Qt >= 6.10 的情况。如果项目需要在旧版本（如 6.5, 6.8）上编译，且旧版本不需要该私有模块，目前的写法是可以的。但如果项目在旧版本上编译且旧版本必须通过某种方式（如打补丁或使用旧版私有 API）实现相同功能，则需要补充 else 分支。
• CMake 版本要求：使用 VERSION_GREATER_EQUAL 是比较现代的 CMake 特性，请确保项目根目录的 cmake_minimum_required(VERSION ...) 版本不低于 3.7（虽然现在大多数项目都已高于此版本）。

3. 代码性能

• 构建时间：find_package 操作通常会有一定的开销，但由于这里使用了 if 条件判断，只有在满足特定版本时才会执行额外的查找。因此，对于不满足条件的构建环境，不会增加额外的构建时间开销，性能处理得当。

4. 代码安全

• REQUIRED 关键字：在 find_package(Qt6 COMPONENTS WaylandClientPrivate REQUIRED) 中使用了 REQUIRED。这意味着如果系统安装了 Qt 6.10+ 但由于某种原因（如安装不完整）缺少该私有组件，CMake 配置阶段会直接报错并终止。这是安全且符合预期的做法，防止了后续编译因缺少头文件而产生难以理解的错误。
• 隐式依赖风险：引入 WaylandClientPrivate 可能会引入 Qt 内部未公开的依赖。在打包发布（如制作 deb/rpm 包）时，需要确保生成的依赖关系正确，防止运行时因缺少底层库而崩溃。

改进建议

为了提高代码的健壮性和可维护性，建议对代码进行如下微调：

1. 添加注释：说明为什么需要 6.10 版本以及引入该私有模块的目的。
2. 处理非 REQUIRED 场景（可选）：如果该私有模块是可选的（即有它功能全，没它功能降级），可以将 REQUIRED 改为检查结果并设置定义宏。

优化后的代码示例：

find_package(Qt6 REQUIRED COMPONENTS Core DBus Concurrent WaylandClient Gui)

# 引入 WaylandClientPrivate 以支持 Qt 6.10+ 的新特性
# 注意：使用私有 API 需谨慎，未来版本可能会变动
if(Qt6_VERSION VERSION_GREATER_EQUAL 6.10)
    find_package(Qt6 COMPONENTS WaylandClientPrivate)
    if(Qt6WaylandClientPrivate_FOUND)
        # 如果找到了，定义一个宏，方便在 C++ 代码中进行条件编译
        add_definitions(-DQT_WAYLANDCLIENT_PRIVATE_SUPPORT)
    else()
        message(WARNING "Qt 6.10+ detected but WaylandClientPrivate module not found. Some features may be disabled.")
    endif()
endif()

find_package(Dtk6 REQUIRED COMPONENTS Core)
find_package Threads REQUIRED)
find_package(TreelandProtocols REQUIRED)

修改点说明：

• 移除了 REQUIRED，改为检查 Qt6WaylandClientPrivate_FOUND。这使得构建过程更具弹性，除非该功能是核心必须的。
• 添加了 add_definitions，这样 C++ 代码可以使用 #ifdef QT_WAYLANDCLIENT_PRIVATE_SUPPORT 来安全地包含私有头文件。
• 添加了 message(WARNING ...)，在开发者环境配置不完美时提供明确的提示。

如果该模块是必须的（即没有它程序无法运行），则保持原样即可，但建议添加注释。

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: felixonmars, zccrs

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