[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:  patch
        Priority:  normal                        |        Milestone:
       Component:  Compiler                      |          Version:  7.6.3
      Resolution:                                |         Keywords:
Operating System:  Unknown/Multiple              |     Architecture:
 Type of failure:  Compile-time performance bug  |  Unknown/Multiple
       Test Case:                                |       Difficulty:
        Blocking:                                |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
-------------------------------------------------+-------------------------
Changes (by nh2):

 * status:  new => patch


Comment:

 I wrote a patch:

 https://github.com/nh2/ghc/compare/fix-interface-hashes-mtime
 https://github.com/nh2/packages-base/compare/fix-interface-hashes-mtime

 It contains some preparatory cleanup commits, the main change is at
 https://github.com/nh2/ghc/commit/e368816.

 This fixes my test case.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8144#comment:10>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler