/tmp/ccAceHhY.o: In function `main': main.c:(.text+0xc7): undefined reference to `dlopen' main.c:

  写一些调用dlopen函数的程序，编译的时候总是报： /tmp/ccAceHhY.o: In function `main':
main.c:(.text+0xc7): undefined reference to `dlopen'
main.c:(.text+0x11c): undefined reference to `dlsym'
main.c:(.text+0x160): undefined reference to `dlclose'
collect2: ld returned 1 exit status

解决办法：编译的时候加 -ldl，头文件加, dlopen等函数需要链接到libdl.so动态库上。