CMake：为库设置用户定义的路径

Question

我正在使用 Windows，我想创建一个 CMakeLists.txt 以允许我构建 Qt 应用程序。

我已将 Qt 安装在 PATH 环境变量中不存在的文件夹中，我想在调用 CMake 时指定该文件夹。

我想创建一个变量，当我设置 Qt 库路径时，可以在从命令行和 gui 调用 CMake 时设置该变量。有了这个，我可以运行 CMake 并使用存储在任何文件夹中的 Qt 编译项目。我该怎么做？

这是我的 CMakeFile：

cmake_minimum_required (VERSION 3.0)

project (myproject)

set (project_name myproject)
set (project_major_version 0)
set (project_minor_version 1)
set (project_fix_version 0)
set (project_version ${project_major_version}.${project_minor_version}.${project_fix_version})
set (output_dir "build")

# Source files
include_directories (${cmake_current_source_dir})
file (GLOB project_src "*.cpp")

# Project settings
set (cmake_automoc on)
find_package (qt5widgets)
add_executable (myproject ${project_src})
target_link_libraries (${project_name} qt5::widgets)

Answer 1

Qt5 Documentation states:

In order for find_package to be successful, Qt 5 must be found below the CMAKE_PREFIX_PATH, or the Qt5<Module>_DIR must be set in the CMake cache to the location of the Qt5WidgetsConfig.cmake file. The easiest way to use CMake is to set the CMAKE_PREFIX_PATH environment variable to the install prefix of Qt 5.

CMake：为库设置用户定义的路径

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