LLVM 6.0 has been tagged yesterday. In the context of a planned upgrade, could we import in one go compiler-rt 6.0.0 even if it will be detached from build? There are GSoC task proposals to integrate the newly added features in compiler-rt (sanitizers, libfuzzer etc) and I have a candidate for one of these tasks. Importing this repository and leaving the integration to go, without need to test patches adding compiler-rt that are over 2MB large [1]. While there, how about an upgrade of LLVM libunwind (src/sys/lib/libunwind/)? [1] http://netbsd.org/~kamil/llvm/compiler-rt-scratch-2018-02-16.txt.bz2 a stub of integration, shared with a student.
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