Courtesy of Karl Zylinkski's blog on how to do hot code reloading with Odin. Find his more comprehensive template here.

Install the Odin programming language.

Build the game DLL:

odin build game -build-mode:dll -out:game.dll

Compile main and run it:

odin run main

In game/game.odin, modify game_update:

game_update :: proc() -> bool
{
-   memory.some_state += 1
+   memory.some_state -= 1
    fmt.println(memory.some_state)
    return true
}

Rebuild the game DLL:

odin build game -build-mode:dll -out:game.dll

Now you're "hot relodin"!

odin build main_release