#4012: Compilation results are not deterministic -------------------------------------+------------------------------------- Reporter: kili | Owner: niteria Type: bug | Status: new Priority: high | Milestone: 8.2.1 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: Related Tickets: #10424 | Differential Rev(s): Phab:D910, | Phab:D1073, Phab:D1133, Phab:D1192, | Phab:D1268, Phab:D1360, Phab:D1373, Wiki Page: | Phab:D1396, Phab:D1457, Phab:D1468, DeterministicBuilds | Phab:D1487, Phab:D1504, Phab:D1508 -------------------------------------+------------------------------------- Comment (by Bartosz Nitka <niteria@…>): In [changeset:"586d55815401c54f4687d053fb033e53865e0bf1/ghc" 586d558/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="586d55815401c54f4687d053fb033e53865e0bf1" Use UniqFM for SigOf Summary: The Ord instance for ModuleName is currently implemented in terms of Uniques causing potential determinism problems. I plan to change it to use the actual FastStrings and in preparation for that I'm switching to UniqFM where it's possible (you need *one* Unique per key, and you can't get the keys back), so that the performance doesn't suffer. Test Plan: ./validate Reviewers: simonmar, austin, ezyang, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2320 GHC Trac Issues: #4012 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:208> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler