Why do we have Dmain?

[Dukc]

On Friday, 22 October 2021 at 07:00:25 UTC, Mike Parker wrote:
> The entry point for your program is a function `_start`. That's 
> implemented in the C runtime, which all D programs depend on. 
> It in turn calls `main`, as it does for C and C++ programs.

It is possible, in both C and D, to write your own `_start` and 
not depend on the C runtime.

This is something you want to do only if necessary though - C 
runtime is so small that you don't want to drop it for any 
realistic desktop or even a smartphone program. The usual reason 
to do this is if there is no C runtime easily available - meaning 
mainly embedded targets.