Please don't *ever* make this change. I agree with Zack, and just for CI purposes; it is simply too big of an incompatibility to inflict at this late date.
Mike, thanks for the suggestion, but let's skip this one. --karl P.S. Personally, I am no fan of silent builds. I find that inevitably I need to debug a build at some point and any debugging is greatly impaired by the silence. And it is not necessarily easy to completely undo it (make V=1 does not do everything, in my experience.) Anyway ...