Re: [PATCH v3 1/2] difftool: add a skeleton for the upcoming builtin

> On Fri, Nov 25, 2016 at 12:05:00PM +0100, Johannes Schindelin wrote:
> 
> > > I would have expected it to just be a build-time flag, like:
> > > 
> > >   make BUILTIN_DIFFTOOL=Yes test
> > 
> > That works for Git developers.
> > 
> > I want to let as many users as possible test the builtin difftool.
> > Hopefully a lot more users than there are Git developers.
> > 
> > Which means that I need a feature flag in production code, not a build
> > time flag.
> 
> Ah, I didn't realize that was a requirement. If this is going to be part
> of a release and real end-users are going to see it, that does make me
> think the config option is the better path (than the presence of some
> file), as it's our standard way of tweaking run-time behavior.