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sof authored
Interface file version checking support. Added a compiler version field to the interface file header. The format is now _interface_ <IfaceName> <ModuleVersion> <CompilerVersion> where the compiler version follow the value of $(ProjectVersionInt). Any mismatch in version numbers causes the renamer to give up. A compiler version number of 0 means turn off version checking (used by PrelGHC.hi to avoid having to update every time we release.) .hi-boot files are treated specially, the absence of a compiler version number in the header is taken to mean that there was a `0'. Need to do this since hsc's .hi-boot files have to also be useable by versions of the compiler that don't grok version info in interface files (e.g., ghc-2.10.)
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