simple newbie question

[Adam D. Ruppe via Digitalmars-d-learn]

On Sunday, 22 November 2015 at 09:55:10 UTC, fred wrote:
> How to generate temporary files so compilation time speeds up.
> Normal compilation only produce obj, exe.
>
> If what i mean is that if we compile the files that  unchanged, 
> dmd will look for that temporary files instead of .d files.

The .d and .obj files are already designed so compilation speed 
is high.