Auto-linking is a mechanism for automatically determining which libraries to link to while building a C, C++ or Obj-C program. It is activated by means of #pragma comment(lib, <name>) statements in the header files of the library, or @import <name> depending on the compiler.
Most Windows compilers support auto-linking, as does Clang, while GCC does not support auto-linking [1]
References
Auto-linking Wikipedia(Text) CC BY-SA