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d816eda3c7
never returns, which is true by design. Initially assumed that the reason is llvm_unreachable being dependent on NDEBUG. However, even if llvm_unreachable is replaced by __assume(false), VC still warns in Release modes but not in Debug modes... The real reason turned out to be optimization flags. With /Od in Debug modes the warning is not issued whereas with /O1 it is. I could not find any documentation to this effect, but it is reproducable: Try compiling http://msdn.microsoft.com/en-us/library/khwfyc5d(v=vs.90).aspx with /O1 and then with /Od. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204659 91177308-0d34-0410-b5e6-96231b3b80d8
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