[llvm-commits] [PATCH] An option to selectively enable parts of ARM EHABI support

[Evgeniy Stepanov]

Hi,

at the moment, ARM EHABI instructions for frame unwinding are in a
pretty good shape (I mean the language-independent part, referenced as
"unwinding instructions" in the spec). Unfortunately, "unwinding
descriptors" are broken and universally fail in the personality
routine. I did not dig deeper, but a descriptor of type 1,1 (see ARM
EHABI spec page 39) is very common in the current implementation - and
invalid at the same time.

This patch adds an option to disable emitting unwinding descriptors.
This lets us, by enabling ehabi and disabling descriptors, get a
working backtrace() on ARM.

Please review.
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