Ben Boeckel via Modules <modules_at_[hidden]> writes:

> Remember that the format is versioned; we may want `-fdep-format=trtbd1`
> *and* `-fdep-format=trtbd2` at some point (to support older tools as
> well as new tools at the same time), so the output needs to support
> taking an argument somewhere (and optional arguments like `make -j` are
> not fun).

Why not just use the version then: -fdep-format=1, -fdep-format=2, etc.
That would similar to how, say, git-status --porcelain does it.