Summary: Some versions of memcpy mark pointer arguments as __nonnull, that triggers UBSan errors even when the length passed is 0. Reviewers: manojgupta, metzman Subscribers: dberris, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D71031 [compiler-rt] FDP: assert that num_bytes_to_consume == 0 when size == 0.
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