Geoffrey Malcolm Oxberry 853a3f14c7 Make libunwind provider of unwind virtual pkg ... This commit begins addressing the ideas discussed in #8823. The libunwind library now provides the "unwind" virtual package, which represents the "libunwind base API" common to LLVM libunwind, Apple's LLVM libunwind, and non-GNU libunwind.		2018-08-06 22:01:50 -07:00
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spack	Make libunwind provider of unwind virtual pkg	2018-08-06 22:01:50 -07:00