Hi Eric,

  >Why use this instead of just setting the exceptions enabled by default flag 
to false otherwise?

  Are you thinking along the lines of the original patch [[ 
http://llvm-reviews.chandlerc.com/differential/diff/6509/ | 6509 ]]?
  The original patch decided upon whether exceptions were enabled differently 
for the compiler's and linker's input.
  This refactors the decision into one place.

  > I imagine there's another test for the default behavior on some other 
platforms, but could you verify?

  The default behavior is tested in test/Driver/clang-exception-flags.cpp

  Thank you
  Robert

http://llvm-reviews.chandlerc.com/D2570
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