Skip to content

Instantly share code, notes, and snippets.

What would you like to do?
Fix for "undefined reference to dlopen" in CMake projects

Suppose you get this error with the main.cpp file below:

 Linking CXX executable testlink
 CMakeFiles/testlink.dir/main.cpp.o: In function `main':
 main.cpp:(.text+0x1a): undefined reference to `dlopen'
 main.cpp:(.text+0x2a): undefined reference to `dlclose'
 collect2: ld returned 1 exit status
 make[2]: *** [testlink] Error 1
 make[1]: *** [CMakeFiles/testlink.dir/all] Error 2
 make: *** [all] Error 2

All you need to do is add ${CMAKE_DL_LIBS} to the target_link_libraries() call:

 target_link_libraries(testlink ${CMAKE_DL_LIBS})
add_executable(testlink main.cpp)
#include <dlfcn.h>
int main(int argc, char* argv[]) {
void *handle = dlopen("/usr/lib/", 0);
return 0;
Copy link

kamranrad1993 commented Dec 4, 2020

its a shortcut for :
find_library(dl NAMES dl PATH /usr/lib/x86_64-linux-gnu/
target_link_libraries(${PROJECT_NAME} ${dl})

Copy link

FreePhoenix888 commented Mar 7, 2022

You saved my time! Thank you!

Copy link

PGoski commented Apr 15, 2022

Saved my time also! Thank you!

Copy link

Alireza67 commented May 15, 2022


Copy link

taovc commented May 16, 2022


Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment