D-Programming-Language/dmd — pull request #2686 by blackwhale (2013-10-20 15:13:50+00:00)
Title: fix Issue 10290 DMD with -m64 doesn't append .exe to -of option

See the issue:
http://d.puremagic.com/issues/show_bug.cgi?id=10290

Still a novice in DMD development - how do I make a test case for this?