[PATCH] D39673: Toolchain: Normalize dwarf, sjlj and seh eh

Martin Storsjö via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Tue Nov 7 00:09:37 PST 2017

mstorsjo added a comment.

In https://reviews.llvm.org/D39673#917524, @martell wrote:

> I mostly expect this to be useful where environment has builds all 3 versions of the libunwind. where the library is named differently based on the eh model.
>  e.g. `libunwind-sjlj.a` `libunwind-seh.a` and `libunwind-dwarf.a`
>  With the above exception flags the version of libunwind with the matching model should be automatically linked, I imagine it to be stored in a similar locations as the compiler-rt libs.

Ah, I see. I'm a little hesitant about such an environment, because code built with each exception handling model is essentially a different ABI, and having them all in the same setup feels pretty prone to errors. Like, you need to have built your libcxx and libcxxabi with matching exception handling models as well, so then you need three copies of them as well.



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