Darwin added support in its Xcode 8.0 tools (released in the beta) for universal files where offsets and sizes for the objects are 64-bits to allow support for objects contained in universal files to be larger then 4gb. The change is very straight forward. There is a new magic number that differs by one bit, much like the 64-bit Mach-O files. Then there is a new structure that follow the fat_header that has the same layout but with the offset and size fields using 64-bit values instead of 32-bit values. rdar://26899493 llvm-svn: 273207
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