Good build system?

[Dennis]

On Saturday, 15 August 2020 at 19:20:39 UTC, Adam D. Ruppe wrote:
> It shouldn't do that; if it does, I'd call it an implementation 
> bug. You can list out the specific files that make up a 
> subpackage.

But an enum / template in a different module could still affect 
the subpackage even if it's not linked in, so dub conservatively 
assumes it invalidated the build. The same applies to  
stringImportPaths. Maybe if dub supported also specifying 
`importFiles` instead of `importPaths` it could assume those 
other modules are not imported.