Linux c error undefined reference to dlopen

Question

I work in Linux with C    Eclipse   and want to use a library  Eclipse shows me an error   undefined reference to  dlopen     Do you know a solution    Here is my code     include  lt stdlib h gt   include  lt stdio h gt   include  lt dlfcn h gt   int main int argc  char   argv        void  handle      double   desk  char        char  error       handle   dlopen    lib CEDD LIB so 6   RTLD LAZY       if   handle            fputs  dlerror    stderr           exit 1              desk  dlsym handle   Apply         if   error   dlerror       NULL             fputs error  stderr           exit 1              dlclose handle

User · Answer

I was using CMake to compile my project and I ve found the same problem   The solution described here works like a charm  simply add    CMAKE DL LIBS  to the target link libraries   call

User · Answer

I met the same problem even using -ldl    Besides this option  source files need to be placed before libraries  see undefined reference to  dlopen  39

User · Answer

You have to link against libdl  add     -ldl   to your linker options

User · Answer

In order to use dl functions you need to use the -ldl flag for the linker   how you do it in eclipse       Press Project --  Properties --  C C   build --  Settings --  GCC C   Linker --  Libraries --    in the  Libraries -l   box press the     sign --  write  dl   without the quotes -  press ok --  clean  amp  rebuild your project

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Try to rebuild openssl  if you are linking with it  with flag no-threads  Then try to link like this  target link libraries   project name  dl pthread crypt m   CMAKE DL LIBS

User · Answer

you can try to add this  LIBS -ldl CFLAGS -fno-strict-aliasing   to the configure options

User · Answer

this doesn t work   gcc -ldl dlopentest c       But this does   gcc dlopentest c -ldl            That s one annoying  feature  for sure      I was struggling with it when writing heredoc syntax and found some interesting facts  With CC Clang  this works    CC -ldl -x c -o app exe -  lt  lt  EOF  include  lt dlfcn h gt   include  lt stdio h gt  int main void      if dlopen  libc so 6   RTLD LAZY   RTLD GLOBAL       printf  libc so 6 loading succeeded n      else     printf  libc so 6 loading failed n      return 0    EOF    app exe   as well as all of these     CC -ldl -x c -o app exe -  lt  lt  EOF  CC -x c -ldl -o app exe -  lt  lt  EOF  CC -x c -o app exe -ldl -  lt  lt  EOF  CC -x c -o app exe - -ldl  lt  lt  EOF   However  with CC gcc  only the last variant works  -ldl after -  the stdin argument symbol

User · Answer

Masci is correct  but in case you re using C  and the gcc compiler  take in account that this doesn t work   gcc -ldl dlopentest c   But this does   gcc dlopentest c -ldl   Took me a bit to figure out

User · Answer

The topic is quite old  yet I struggled with the same issue today while compiling cegui 0 7 1  openVibe prerequisite    What worked for me was to set  LDFLAGS  -Wl --no-as-needed  in the Makefile    I ve also tried -ldl for LDFLAGS but to no avail

User · Answer

gcc -o program program c -l  lt library to resolve program c s unresolved symbols gt    A good description of why the placement of -l dl matters  But there s also a pretty succinct explanation in the docs From  man gcc      -llibrary    -l library        Search the library named library when linking    The second        alternative with the library as a separate argument is only for POSIX        compliance and is not recommended             It makes a difference where in the command you write this option  the        linker searches and processes libraries and object files in the order        they are specified   Thus  foo o -lz bar o searches library z after        file foo o but before bar o   If bar o refers to functions in z         those functions may not be loaded

User · Answer

You needed to do something like this for the makefile    LDFLAGS  -ldl  make install   That ll pass the linker flags from make through to the linker  Doesn t matter that the makefile was autogenerated

[c++] Linux c++ error: undefined reference to 'dlopen'

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