How possible is it to put DWARF debug infos in MSCOFF objects ?

[Basile B.]

Now that -m64 + LLD + MINGW works, the question is obvious.

The background idea is of course to allow the use of GDB under 
Windows. At first glance the debug info API is not uniform. This 
is visible if you compare dmd.backend.dwarf and dmd.backend.cgcv 
and the naive idea which would be to replace all the calls 
starting with 'cv8_' with their "dwarf_" equivalent won't work 
(let's say to test in a first time, later a new compiler switch 
could be added to select the debug info format).