CMake：安装两个Qt版本时查找Qt软件包

问题描述

在我的计算机（Ubuntu-Gnome）上，安装了两个Qt版本。一个带有程序包管理器（5.x），另一个带有 / opt / Qt （5.9）手动。

On my computer (Ubuntu-Gnome) are two Qt-versions installed. One with the package manager (5.x) and one manually to /opt/Qt (5.9).

对于一个项目，我需要在CMake中使用 / opt / Qt 安装。但是 find_package（需要Qt5Core 5.9组件）找不到正确的安装：

For one project I need to use the /opt/Qt-installation with CMake. But find_package(Qt5Core 5.9 COMPONENTS CORE REQUIRED) does not find the correct installation:

  Could not find a configuration file for package "Qt5Core" that is
  compatible with requested version "5.9".

  The following configuration files were considered but not accepted:

    /usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreConfig.cmake, version: 5.7.1

我尝试设置 CMAKE_PREFIX_PATH 和 CMAKE_MODULE_PATH 将具有所有路径变体的搜索路径添加到CMake，但根本不起作用。

I tried to set CMAKE_PREFIX_PATH and CMAKE_MODULE_PATH to add a search path to CMake with all variants of paths but it does not work at all.

我该如何正确地将搜索路径设置为第二个安装的 / opt / Qt / ？

How can I correctly set the search path to the second installation at /opt/Qt/?

更新以便@Florian输入

Updates in order to @Florian input

这有效：

find_package(
   Qt5Core 5.9
   COMPONENTS
      Core
   REQUIRED
)

与

cmake -DQt5_DIR:PATH=/opt/Qt/5.9.2/gcc_64/lib/cmake/Qt5Core

但在这种情况下，我只找到了QT5Core。

but in this case I found only QT5Core. With that it seems to work for all components as well:

find_package(
   Qt5 5.9
   COMPONENTS
      Core
   REQUIRED
)

连同

cmake -DQt5_DIR:PATH=/opt/Qt/5.9.2/gcc_64/lib/cmake/Qt5

---

第二次编辑

---

2nd Edit

避免始终将完整路径放在呼叫中，我将此添加到我的 CMakeLists.txt 中：

To avoid to always put the the full path in the call I add this to the my CMakeLists.txt:

set(QT_INSTALL_PATH /opt/Qt)
file( GLOB_RECURSE sres ${QT_INSTALL_PATH}/*/Qt5Config.cmake )
get_filename_component( Qt5_DIR ${sres} DIRECTORY )

此后工作正常：

find_package(
   Qt5 5.9
   COMPONENTS
      Core
      Network
   REQUIRED
)

推荐答案

使用 cmake -DQt5_DIR：PATH = / opt / Qt5 / 5.9.2 / gcc_64 / lib / cmake / Qt5

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