Undefined reference to symbol ‘dlclose@@GLIBC_2.2.5‘ //lib/x86_64-linux-gnu/libdl.so.2

我用cmake編譯經常遇到一個問題，今天在這裡記錄一下：

undefined reference to symbol 'dlclose@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
           

解決方法：

加一個 -ldl，将下面這句話加在CMakeLists.txt裡面

set (CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE} -ldl") 

參考連結：

https://stackoverflow.com/questions/23141575/undefined-reference-to-symbol-dso-missing-from-command-line