[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
-------------------------------------+-------------------------------------
        Reporter:  kili              |                Owner:  niteria
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  6.12.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:  11362             |             Blocking:  12262
 Related Tickets:  #10424            |  Differential Rev(s):  Phab:D910,
                                     |  Phab:D1073, Phab:D1133, Phab:D1192,
                                     |  Phab:D1268, Phab:D1360, Phab:D1373,
                                     |  Phab:D1396, Phab:D1457, Phab:D1468,
       Wiki Page:                    |  Phab:D1487, Phab:D1504, Phab:D1508,
  DeterministicBuilds                |  Phab:D4388
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"d8e47a2ea89dbce647b06132ec10c39a2de67437/ghc"
 d8e47a2e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d8e47a2ea89dbce647b06132ec10c39a2de67437"
 Make cost centre symbol names deterministic.

 Previously, non-CAF cost centre symbol names contained a unique,
 leading to non-deterministic object files which, among other issues,
 can lead to an inconsistency causing linking failure when using cached
 builds sourced from multiple machines, such as with nix. Now, each
 cost centre symbol is annotated with the type of cost centre it
 is (CAF, expression annotation, declaration annotation, or HPC) and,
 when a single module has multiple cost centres with the same name and
 type, a 0-based index.

 Reviewers: bgamari, simonmar

 Reviewed By: bgamari

 Subscribers: niteria, simonmar, RyanGlScott, osa1, rwbarton, thomie,
 carter

 GHC Trac Issues: #4012, #12935

 Differential Revision: https://phabricator.haskell.org/D4388
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:245>
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