--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to jpakkane from comment #0)
> If linking supported generating dependency files like -M does for source
> compilations, this would not be a problem and
The main problem is that GCC doesn't do the linking, it just calls the linker.
GCC is not involved in resolving -lmydep to a file on disk, that's the linker.
So the feature would have to be added to the linker, not to GCC.