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[Driver] [NetBSD] Add -D_REENTRANT when using sanitizers
NetBSD intends to support only reentrant interfaces in interceptors. When -lpthread is used without _REENTRANT defined, things are not guaranteed to work. This is especially important for <stdio.h> and sanitization of interfaces around FILE. Some APIs have alternative modes depending on the _REENTRANT definition, and NetBSD intends to support sanitization of the _REENTRANT ones. Differential Revision: https://reviews.llvm.org/D55654 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@349650 91177308-0d34-0410-b5e6-96231b3b80d8
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