

You don’t. In C everything gets referenced by a symbol during the link stage of compilation. Libraries ultimately get treated like your source code during compilation and all items land in a symbol table. Two items with the same name result in a link failure and compilation aborts. So a library and a program with main is no bueno.
When Linux loads an executable they basically look at the program’s symbol table and search for “main” then start executing at that point
Windows behaves mostly the same way, as does MacOS. Most RTOS’s have their own special way of doing things, bare metal you’re at the mercy of your CPU vendor. The C standard specifies that “main” is the special symbol we all just happen to use
That’s kind of the point though, isn’t it?
If I were to post with “Extend the plank!” there’s a near zero chance that even fans of the movie, or even the franchise, I’m thinking of will get the movie right. If I instead say “Who am I to argue with the Captain of the Enterprise” a normie might guess Star Trek, a true nerd and fan of the franchise will peg that instantly as from Star Trek Generations
Edit: That said, there are several lines in this thread that aren’t necessarily only recognizable to fans or people familiar with the movie, but instead just pop culture references.