Good news on this, though it took a day of head scratching to figure it
out.
It turns out that ARM clang 3.3 and earlier implements C++ exceptions
using the inefficient SJLJ exception ABI - you know, the one that calls
setjmp all the time for every place an unwind might happen. Anyway, they
BTW I think some history may be at work here. clang didn't support
native cpu detection back when I was the chief clang person at
BlackBerry, it may well still not. I would assume the default choice of
arm-linux-gnueabihf, judging from google searching, was mainly driven by
RaspPI enthusiasts who
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