No main() Error

[Ron Tarrant]

On Tuesday, 4 February 2025 at 09:25:14 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> On 04/02/2025 10:20 PM, Richard (Rikki) Andrew Cattermole wrote:
>> Syntax does not play a role in this.
>
> I should clarify this, the compiler already has functions for 
> checking if a function is a main function.
>
> https://github.com/dlang/dmd/blob/89b93e8b0952e8bf5dd73020a23cd7cb1897adcb/compiler/src/dmd/func.d#L595
>
> It looks like it can work without semantic analysis having been 
> done too.

Thanks for the clarification.

I confess I know nothing about compiler/linker design.

Is it possible for the compiler, having read the code file, to 
pass along enough information to the linker so it knows that a) 
there is no `main()` function in the code file and b) the current 
build isn't a library, thus making it possible for the linker to 
inform the user in clearer language that something's off?