Adding ccache-like output caching to dmd

[Petar]

On Tuesday, 29 December 2020 at 17:41:49 UTC, Petar Kirov 
[ZombineDev] wrote:
> On Tuesday, 29 December 2020 at 12:49:45 UTC, Stefan Koch wrote:
>> On Monday, 28 December 2020 at 23:14:02 UTC, Per Nordlöw wrote:
>>> [...]
>>
>> The issue is that because of string imports you don't know the 
>> full set of files you are depending on.
>> which means any change can cause any file to be required.
>
> If we pass the complete set of files (instead of using relying 
> on [string] import paths, which not very precise), this 
> definitely doable.
>
> Sure, the developer "experience" would be a bit more clumsy, 
> but not a big deal either - a wrapper tool could first compile 
> your code with `dmd -i -makedeps` [1] and then save the 
> currently known set of files and then the incremental 
> compilation would use it.
>
> [1]: coming soon: https://github.com/dlang/dmd/pull/12049

Edit: What John Colvin said :D