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The MSys 2 version of 'env' cannot be used to set 'TZ' in the environment due to some portability hacks in the process spawning compatibility layer[1]. This affects test/Object/archive-toc.test, which tries to set TZ in the environment. Other than that, this saves a subprocess invocation of a small unix utility, which is makes the tests faster. The internal shell does not support shell variable expansion, so this idiom in the ASan tests isn't supported yet: RUN: env ASAN_OPTIONS=$ASAN_OPTIONS:opt=1 ... [1] https://github.com/Alexpux/MSYS2-packages/issues/294 Differential Revision: http://reviews.llvm.org/D11350 llvm-svn: 242696
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