I spoke too soon (sigh) about this new -preview=noXlinker option
actually working, see <https://issues.dlang.org/show_bug.cgi?id=20244>.
Reading that bug report, it appears to me that this is not a simple "preview" option: dmd.conf may need adjustment and thus the user cannot simply switch between the option being on or off. Why not implement LDC's -Xcc as well?
-Johan