CMake Error at CMakeLists.txt:24

最新推荐文章于 2025-06-11 21:57:39 发布

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最新推荐文章于 2025-06-11 21:57:39 发布 · 1w 阅读

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#Cmake

当遇到CMake Error at CMakeLists.txt:24 (add_subdirectory): add_subdirectory给出的源gtest目录不存在的问题时，原因在于Cmake版本低于3.11不支持没有源文件的add_library。从Cmake 3.11开始，add_library和add_executable命令即使没有源文件也不会报错，只要后续通过target_sources()添加源文件即可。解决方案是创建一个名为'empty.cpp'的文件，并修改flann/src/cpp/CMakeLists.txt中的相应行，将add_library的源文件替换为'empty.cpp'。

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问题：CMake Error at CMakeLists.txt:24 (add_subdirectory):
add_subdirectory given source "gtest" which is not an existing directory.

解答：

Cmake < 3.11 doesn't support add_library without any source file, but flann CMake use a trick that use an empty string "" as source list (i.e add_library(foo SHARED "")).
The existing flann Cmake code violates the new behavior of add_library() for Cmake>=3.11.
buildroot/buildroot@45a39b3

It turns out in Cmake 3.11, "add_library()" and "add_executable()" commands can be called without any sources and won't complain as long as sources are added later via "target_sources()" command.
https://blog.kitware.com/cmake-3-11-0-available-for-download/

Fix is proposed here: