Waste of computing resources in pull requests that only change the ddoc

[Seb via Digitalmars-d]

On Friday, 4 March 2016 at 09:03:43 UTC, BBasile wrote:
> I don't know If it's a known problem but auto tester resources 
> are lost by PR that only change or add DDOC comments. For 
> example whole dmd+runtime+phobos can be rebuild 3 times per day 
> on 8 machines while it's not necessary.
>
> I understand that's a side-effect of the doc being directly in 
> the code, but...
>
> Wouldn't be possible to run a background tool, based on 
> libdparse, that
> - detects changed lines in the diff.
> - run the libdparse-based tool to see if changed lines are only 
> in the ddoc.
>
> Depending on the results, either only CyberShadow's doc builder 
> would run or also the big auto-tester.

I totally agree that this is a problem, but sometimes there are 
weird side effects, e.g.

https://github.com/D-Programming-Language/phobos/pull/4049

(it does change a bit more than just ddoc though)