From Reddit

[bearophile]

Don:
> No. But that's nothing to do with D. This is an object file 
> incompatibility, not a language issue.
> You can't use a MingW object file from DMC, or from MSVC, either.
> DMD can however use an object file from any C compiler which uses OMF 
> object files, such as Watcom or DMC.
> OTOH you can get a MinGW object file, run it through an obj conversion 
> utility, and then link it to DMD.

I understand now, thank you for explaining me. I'll add such information to that part of the blog post.
(I also have a lot of comments to answer there still, they are all anonymous).

Bye,
bearophile