Smart linking

```
20:51 <@beware> anjbe_: is "smart linking" something you can do? smart linking means: only include things that are actually referenced
20:51 <@beware> this mostly helps with libraries
20:51 <@beware> as not all of the library has to be linked
20:51 <@beware> libraries tend to contain a lot of things a project doesn't need
20:52 <@beware> i think a linker could do this transparently
20:52 <@beware> (as in, as part of the linker)
20:53 <@beware> to resolve "is symbol X being referenced", you need to trace it from the program's entry point
20:53 <@beware> because a library can reference a symbol, but if that library is never used, then this reference doesn't mean it should be included
20:54 <@beware> anything (that has a symbol) that is never referenced is "dead" (as in, dead code, dead data)
```