An other problem is when GCC drops architecture support -- say some old arch which Linux doesn't run on but which the BSDs do -- then the BSDs are forced to maintain multiple old versions of GCC...
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This document is intended for people applying to Ph.D. programs in computer science or related areas. The document is informal in nature, and is meant to express only the opinions of the author. The author is currently an assistant professor of computer science at CMU, and has been involved in the Ph.D. admissions process at CMU, U.C. Berkeley, and MIT."
www.cs.cmu.edu/~harchol/gradschooltalk.pdf