[Issue 13517] Only touch .di generated file if changed

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13517

--- Comment #16 from Ketmar Dark <ketmar at ketmar.no-ip.org> ---
(In reply to Steven Schveighoffer from comment #15)
> .di has no dependencies in the build tool, nor does it know how to build the
> .di file. It's just a side effect of building the .o
ahem. just tried `dmd -c z00.d`. no .di file was built. what kind of "side
effect" are you talking here? ah, and another try: `dmd -c -o- -H z00.d`. this
time i got .di file, but no .o file. i'm confused.

and why build tool doesn't know about '.di'? any sane build tool allows adding
dependencies. and no build tools except DUB and my own knows about D
out-of-the-box anyway.

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