cmake LINK_DIRECTORIES不起作用,报错的原因

CMake链接库顺序与目录设置

最新推荐文章于 2024-11-26 16:25:09 发布

原创最新推荐文章于 2024-11-26 16:25:09 发布 · 1.8w 阅读

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本文介绍在使用CMake构建项目时，正确设置链接库目录和链接库的顺序至关重要。若LINK_DIRECTORIES指令位于ADD_EXECUTABLE之后，会导致链接器无法找到库文件。应先设置链接库目录，再添加可执行文件。此外，官方建议直接通过target_link_libraries传递绝对路径，避免使用INCLUDE_DIRECTORIES。


ADD_EXECUTABLE(main main.cpp)

TARGET_LINK_LIBRARIES(main libhello.so)

INCLUDE_DIRECTORIES(/tmp/t3/include/hello /tmp/t3/lib)

LINK_DIRECTORIES(/tmp/t3/lib)

这种情况下会出错，说找不到引用，原因是ADD_EXECUTABLE出现在LINK_DIRECTORIES之前。正确的做法是将LINK_DIRECTORIES放在ADD_EXECUTABLE之前。如下：


LINK_DIRECTORIES(/tmp/t3/lib)

ADD_EXECUTABLE(main main.cpp)

TARGET_LINK_LIBRARIES(main libhello.so)

INCLUDE_DIRECTORIES(/tmp/t3/include/hello /tmp/t3/lib)

另外，官网不推荐使用INCLUDE_DIRECTORIES，原文如下：

Note that this command [link_directories] is rarely necessary. Library locations returned by find_package() and find_library() are absolute paths. Pass these absolute library file paths directly to the target_link_libraries() command. CMake will ensure the linker finds them.