[tor-bugs] #14422 [Tor Browser]: Fix makefile rules to make+hash incrementals by default

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#14422: Fix makefile rules to make+hash incrementals by default
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     Reporter:  mikeperry  |      Owner:  tbb-team
         Type:  defect     |     Status:  needs_review
     Priority:  normal     |  Milestone:
    Component:  Tor        |    Version:
  Browser                  |   Keywords:  tbb-gitian, TorBrowserTeam201501R
   Resolution:             |  Parent ID:
Actual Points:             |
       Points:             |
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Comment (by mikeperry):

 Do the incremental rules cause the build to fail if the previous version
 is not present? Perhaps we can make that not be a failure condition, but
 instead simply print out a warning during 'make hash' or equivalent.

 We could also have this warning give a wget scriptlet/command to download
 the previous build's mar files, or also make that a rule, or something?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14422#comment:4>
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