How to correctly deal with dmd.conf with multiple dmd installations - [ref osx, brew, digger]

[Vladimir Panteleev]

On Tuesday, 25 September 2018 at 10:34:17 UTC, aliak wrote:
> When you do `digger install` it seems to not “install” a 
> `dmd.conf` but it does install the `dmd` binary in 
> `/usr/local/bin/dmd` - but that wasn’t built with `SYSCONFDIR` 
> so it doesn’t find `/usr/local/etc/dmd.conf` either, but even 
> if it did, that’s the wrong `dmd.conf` (i.e. not the one that 
> the build was based on - so would it even point to the right 
> env?).

The solution I'm thinking of for Digger is to attempt to detect 
the SYSCONFDIR of the current `dmd` binary in `PATH`, and use 
that by default when Digger builds D. Doing so would break 
Digger's "maximally reproducible builds" policy a little, so we'd 
need to be loud about it.

An alternative would be to complain loudly when attempting to 
build or (especially) install a compiler with a mismatching 
SYSCONFDIR, but still proceed with the default.