【CMake报错】Cannot specify compile definitions for target “PRIVATE“ which is not built...

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【CMake报错】Cannot specify compile definitions for target “PRIVATE” which is not built…

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报错：Cannot specify compile definitions for target “PRIVATE” which is not built by this project.

1）报错内容

CMake Error at CMakeLists.txt:72 (target_link_directories):
Cannot specify link directories for target “PRIVATE” which is not built by this project.

CMake Error at CMakeLists.txt:73 (target_compile_definitions):
Cannot specify compile definitions for target “PRIVATE” which is not built by this project.

CMake Error at CMakeLists.txt:80 (target_link_directories): Cannot
specify link directories for target “PRIVATE” which is not built by this project.

2）解决方案

这个错误提示的是在CMakeLists.txt文件中，试图为一个名为"PRIVATE"的目标设置属性，但是这个目标在项目中并不存在。
实际上，“PRIVATE”、"PUBLIC"和"INTERFACE"是target_*命令中的关键字，用于指定如何传递这些属性。

错误可能是因为没有正确地为target_*命令提供目标名称，或者目标名称和关键字的顺序被弄反了。

错误情况一

如果存在以下代码：

target_include_directories(PRIVATE ${CMAKE_SOURCE_DIR}/include)

应该更正为：

target_include_directories(YourActualTargetName PRIVATE ${CMAKE_SOURCE_DIR}/include)

错误情况二

如果存在以下代码：

target_link_directories(${ProjectName} PRIVATE ${RELEASE_LIB_DIR})

应该更正为：

target_link_directories(YourActualTargetName PRIVATE ${RELEASE_LIB_DIR})

其中，YourActualTargetName是你要设置属性的实际目标名称，

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