LLVM doesn't look completely 64-bit capable on Windows. One problem I see is in DataTypes.h where ssize_t is defined for Windows. My understanding is in general, ssize_t is a 32-bit integer on 32-bit machines, and a 64-bit integer on 64-bit machines. So for Windows, this type definition should vary for 32 and 64-bit machines. A potential implementation would be: #ifdef _WIN64 typedef __int64 ssize_t; #else typedef _w64 int ssize_t; #endif A discussion of "_w64" - http://msdn.microsoft.com/en-us/library/s04b5w00(VS.71).aspx. It's only supported on later versions of Visual Studio, so something like #if !defined(_W64) # if !defined(__midl) && (defined(_X86_) || defined(_M_IX86)) && _MSC_VER >= 1300 # define _W64 __w64 # else # define _W64 # endif #endif would be needed. Regards, Michael Smith -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20100401/dc25bf4b/attachment.html>