[GHC] #8144: Interface hashes include time stamp of dependent files (UsageFile mtime)

[GHC]

#8144: Interface hashes include time stamp of dependent files (UsageFile mtime)
-------------------------------------+-------------------------------------
              Reporter:  nh2         |            Owner:
                  Type:  bug         |           Status:  infoneeded
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.6.3
            Resolution:              |         Keywords:  testcase
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time performance bug               |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by thoughtpolice):

 Here's a WIP patch:
 https://github.com/ghc/ghc/commit/a3bf4bfae694572b0bf886fcb1191d066d242aed
 on `wip/8144`

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8144#comment:29>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler