[llvm-commits] PATCH: exception-free bugpoint

[Nick Lewycky]

LLVM is nearly exception-free, but we still have exceptions on in the 
VMCore because bugpoint uses them internally. Bugpoint uses them for 
things like stopping a bisection on the pass list when the code 
generator crashes and switches to debugging the codegen crash instead. 
(This means that bugpoint has functions taking function pointer 
parameters which in turn throw exceptions.)

This patch threads error return values and/or std::string 
pointers/references all over bugpoint to replicate the existing behaviour.

There is supposed to be absolutely no functionality change. I've tested 
this side-by-side with unmodified bugpoint and fixed all the problems I 
could find, but honestly I still don't trust this patch very much.

Please review!

Nick

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