D-Programming-Language/dmd — pull request #1796 by glycerine (2013-03-25 04:55:48+00:00)
Title: fix issue #9805. 

(Trying pull request again against the repaired master... hopefully 3rd time's a charm.)

Enable the optional DFLAGS_PRE env var to pre-pend arguments to the dmd command line. The is the complement of DFLAGS, which always appends.