CMake错误:无法确定目标的链接语言 [英] CMake Error: Cannot determine link language for target

问题描述

我创建了以下目录:

FrameWork/
├── CMakeLists.txt ==> contains only add_subdirectory(UtilsBasic)
└── UtilsBasic
    ├── CMakeLists.txt ==> Contains only add_subdirectory(SmartSingleton)
    └── SmartSingleton
        ├── CMakeLists.txt
        ├── include
        │   └── SmartSingleton.hpp

---

SmartSingleton 目录中的 CMakeLists.txt 包含:

set(codeprod_list
        include/SmartSingleton.hpp)

USR_add_shared_lib(SmartSingleton "${codeprod_list}")
target_link_libraries(SmartSingleton PUBLIC Common)
target_include_directories(SmartSingleton PUBLIC include/)

---

该项目的主要 CMakeLists.txt 如下:

cmake_minimum_required (VERSION 3.4)

project (MyProject)
USR_init_project(MyProject)

add_subdirectory(src/FrameWork)

---

错误

-配置完成的CMake错误:CMake无法确定目标:SmartSingleton的链接器语言CMake错误:无法确定链接目标"SmartSingleton"的语言.

-- Configuring done CMake Error: CMake can not determine linker language for target: SmartSingleton CMake Error: Cannot determine link language for target "SmartSingleton".

我不明白为什么会出现该错误.我的意思是，在 Framework 中，我创建了 UtilsBasic 的链接，然后又创建了 SmartSingleton 的链接.

I don't understand Why I am getting that Error. I mean In the Framework I created a link to UtilsBasic and in turn a link to SmartSingleton.

推荐答案

在您的 SmartSingleton/CMakeLists.txt 文件中尝试以下操作:

Try this in your SmartSingleton/CMakeLists.txt file:

set_target_properties(SmartSingleton属性LINKER_LANGUAGE CXX)

这将直接告诉CMake用于该目标的语言.

This will directly tell CMake which language to use for that target.

如果您的库实际上只是头文件，则可能还会收到您提到的错误.考虑将此库设为 INTERFACE 库:

If your library is truly only header files though, you will likely receive the error you mention also. Consider making this library an INTERFACE library:

add_library(SmartSingleton INTERFACE)
target_include_directories(SmartSingleton INTERFACE include/)

以下是 docs 用于接口库.

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