Adding ccache-like output caching to dmd

[Max Haughton]

On Monday, 28 December 2020 at 23:14:02 UTC, Per Nordlöw wrote:
> Has anyone considered integrating into a `dmd` a ccache-like 
> caching of output files indexed by digests based on
>
> - environment variables,
> - process arguments which, in turn, decide
> - input file contents (including import files detected upon 
> first uncached compile)
> - dmd compiler binary fingerprint
> - ...probably something more I missed
>
> Initial call stores that list alongside content hash and 
> resulting binary(s).
>
> If not, would anyone have any strong objections against adding 
> this?

If it's implemented in a sensible manner I don't see why not. My 
only worry would be that dmd code tends to be a weird blend of C, 
C++, and Java - if the cache is properly wrapped up in a way that 
compartmentalizes the things that can go wrong then go for it.