Question

during compilation of dynlinktest.c it gives following error:

unipro@ubuguest:~$ cc dynamiclinktest.c -o dynamiclinktest
/tmp/ccli8dp2.o: In function main':
dynamiclinktest.c:(.text+0x53): undefined reference todlopen’
dynamiclinktest.c:(.text+0x83): undefined reference to dlsym'
dynamiclinktest.c:(.text+0x109): undefined reference todlclose’
collect2: ld returned 1 exit status

after using cc dynlinktest.c -o dynlinktest -ldl it runs.
i didn’t get why it is neccessary using -ldl ?

edit1: leaving space before error.

Answer 1

-ldl includes the reference to the library that has the symbols for loading dynamic libraries (such as dlopen).