CMAKE_PREFIX_PATH 不能帮助 CMake 找到 Qt5

Question

从这里： https ://stackoverflow.com/a/28327499/462608

我试过这个：

 cmake_minimum_required(VERSION 2.8.12)

project(qtquick_hello_cmake)

set(CMAKE_PREFIX_PATH "/opt/Qt5.9.1/5.9.1/")

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

find_package(Qt5 COMPONENTS Quick Core REQUIRED)

qt5_add_resources(RESOURCES qml.qrc)

add_executable(${PROJECT_NAME} "main.cpp" "qml.qrc")

qt5_use_modules(${PROJECT_NAME} Quick Core)

target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5::Quick)

这是 cmake .

 :~/junk/qtquick_hello_cmake$ cmake .
CMake Error at CMakeLists.txt:11 (find_package):
  By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt5", but
  CMake did not find one.

  Could not find a package configuration file provided by "Qt5" with any of
  the following names:

    Qt5Config.cmake
    qt5-config.cmake

  Add the installation prefix of "Qt5" to CMAKE_PREFIX_PATH or set "Qt5_DIR"
  to a directory containing one of the above files.  If "Qt5" provides a
  separate development package or SDK, be sure it has been installed.

-- Configuring incomplete, errors occurred!
See also "/home/.../junk/qtquick_hello_cmake/CMakeFiles/CMakeOutput.log".

这是为了表明 /opt/Qt5.9.1/ 确实存在。

 :~/junk/qtquick_hello_cmake$ cd /opt/Qt5.9.1/5.9.1/
:/opt/Qt5.9.1/5.9.1$ ls
android_armv7  android_x86  gcc_64  Src

在这里，我使用 -DCMAKE 选项运行 cmake，但输出仍然相同：

 :~/junk/qtquick_hello_cmake$ cmake -DCMAKE_PREFIX_PATH=/opt/Qt5.9.1/5.9.1/ -DWITH_QT5=1 .
CMake Error at CMakeLists.txt:11 (find_package):
  By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt5", but
  CMake did not find one.

  Could not find a package configuration file provided by "Qt5" with any of
  the following names:

    Qt5Config.cmake
    qt5-config.cmake

  Add the installation prefix of "Qt5" to CMAKE_PREFIX_PATH or set "Qt5_DIR"
  to a directory containing one of the above files.  If "Qt5" provides a
  separate development package or SDK, be sure it has been installed.

-- Configuring incomplete, errors occurred!
See also "/home/.../junk/qtquick_hello_cmake/CMakeFiles/CMakeOutput.log".

目录内容：

 :~/junk/qtquick_hello_cmake$ ls
CMakeCache.txt  CMakeFiles  CMakeLists.txt  main.cpp  main.qml  qml.qrc

原文由 Aquarius_Girl 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

我安装了以下缺少的软件包：

 sudo apt-get install qtbase5-dev
sudo apt-get install qtdeclarative5-dev

现在不需要附加任何类型的前缀：

制作清单：

     :~/junk/qtquick_hello_cmake$ cat CMakeLists.txt
    cmake_minimum_required(VERSION 2.8.12)

    project(qtquick_hello_cmake)

    set(CMAKE_INCLUDE_CURRENT_DIR ON)
    set(CMAKE_AUTOMOC ON)
    set(CMAKE_AUTORCC ON)

    find_package(Qt5 COMPONENTS Quick Core REQUIRED)

    qt5_add_resources(RESOURCES qml.qrc)

    add_executable(${PROJECT_NAME} "main.cpp" "qml.qrc")

    qt5_use_modules(${PROJECT_NAME} Quick Core)

    target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5::Quick)

新输出：

 :~/junk/qtquick_hello_cmake$ ls
build  CMakeLists.txt  main.cpp  main.qml  qml.qrc

:~/junk/qtquick_hello_cmake$ cd build/
:~/junk/qtquick_hello_cmake/build$ rm -rf *

:~/junk/qtquick_hello_cmake/build$ cmake ../
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/.../junk/qtquick_hello_cmake/build

错误现在消失了。

谢谢：

https://answers.ros.org/question/236324/could-not-find-a-package-configuration-file-provided-by-qt5widgets/

https://askubuntu.com/questions/508503/whats-the-development-package-for-qt5-in-14-04

原文由 Aquarius_Girl 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

对于 macOS，在终端中导出以下变量。

 export CMAKE_PREFIX_PATH=/usr/local/Cellar/qt5/5.15.1/

可能还有另一个版本，请检查您拥有的版本并相应地更改最后一个路径组件。

发出构建重新配置

cmake ../

原文由 3x. 发布，翻译遵循 CC BY-SA 4.0 许可协议