CMake应用程序依赖于基于Qt的库(CMake app dependency on Qt

CMake应用程序依赖于基于Qt的库(CMake app dependency on Qt-based library)

我将描述我的CMake项目目前是如何安排的。 这是早期的，所以欢迎提出更好安排的建议。

App依赖于Lib1 Lib1依赖于Lib2 Lib2使用Qt

文件夹结构：

顶层 LIB1 LIB2 应用

我在每个级别都有CMakeLists.txt。

在Lib1中我添加了lib_library（STATIC），然后是带有Lib2的target_link_library，它也是STATIC。

Lib2的CMakeLists.txt为Qt5Widgets，Qt5Core和Qt5Gui执行find_package调用。

最后，App的CMakeLists.txt执行add_executable，然后执行Lib1的target_link_libraries。

一切都编译和链接，直到我实际在App代码中调用以使用Lib2中的函数。 然后我得到一堆未解决的符号链接器错误，指向Lib2中的函数。 如果我将Lib2设为OBJECT库并相应地更改Lib1中的链接似乎并不重要。 我也尝试将App与Lib1和Lib2连接起来，结果相同。

我在这做错了什么？

I'll describe how my CMake project is currently arranged. It's early, so suggestions for a better arrangement are welcome.

App depends on Lib1 Lib1 depends on Lib2 Lib2 uses Qt

folder structure:

top-level Lib1 Lib2 App

I have CMakeLists.txt at each level.

In Lib1 I add_library (STATIC), then target_link_library with Lib2 which is also STATIC.

Lib2's CMakeLists.txt does the find_package calls for Qt5Widgets, Qt5Core, and Qt5Gui.

Finally, App's CMakeLists.txt does the add_executable followed by target_link_libraries for Lib1.

Everything compiles and links until I actually make a call in the App code to use a function in Lib2. Then I get a bunch of unresolved symbol linker errors pointing to functions from Lib2. It doesn't seem to matter if I make Lib2 an OBJECT library and change the linking in Lib1 accordingly. I've also tried linking App against both Lib1 and Lib2 with the same results.

What am I doing wrong here?

最满意答案

Find_packages只是使用库位置填充变量。

您需要使用Qt5Widgets，Qt5Core和Qt5Gui在Lib2上使用target_link_libraries，以便cmake可以正确链接它们。

Find_packages simply populates the variable with the library locations.

You need to target_link_libraries on Lib2 with Qt5Widgets, Qt5Core, and Qt5Gui so cmake can properly link them.