workaround for `The module 'foo.bar' is already defined` when recompiling objects?

[timotheecour via Digitalmars-d]

On Sunday, 11 June 2017 at 07:09:33 UTC, timotheecour wrote:
> On Sunday, 11 June 2017 at 05:21:23 UTC, Timothee Cour wrote:
>> [...]
>
> NOTE: this is on linux, and the above simple case doesn't 
> reproduce
> the error, but my test case is similar albeit from a larger 
> program
> that's hard to reduce.
>
> [...]

On Sunday, 11 June 2017 at 07:09:33 UTC, timotheecour wrote:

Removing `-l:libphobos2.so.0.72` from dub.json "lflags" fixed the 
issue, but I'd like to understand why?