Commits on Jul 9, 2020

1. Avoid colliding with older Cargo fingerprint changes …

   The fingerprint format Cargo stores changed recently in a way that
   older Cargos cannot understand. Unfortunately though older Cargos are
   colliding on some compilation units trying to read the new format and
   they're bailing out. This commit fixes this issue by ensuring that the
   location for fingerprint metadata is different in older Cargos and newer
   Cargos.
   
   Fingerprint metadata is always stored in a location with a hash in the
   file name. This hash typically includes the hash of rustc's version
   information itself, but for units which don't have a `Metadata` it's a
   much simpler hash which is much more likely to collide with other
   versions of Cargo. The fix in this commit is to extract the metadata
   version that we're hashing to a constant, and then also hash it for
   generating a filesystem location to house fingerprint data for a unit
   that has no `Metadata`.
   
   Closes rust-lang#8472

   

   alexcrichton committed Jul 9, 2020
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