#14481: Mutually dependent modules with orphan instances causes missing symbols with single-shot compilation -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.4.1 Component: Compiler (Type | Version: 8.2.1 checker) | Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #14482 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): There may be more bugs along the lines of #14482. In general we require that hs-boot files are compiled before hs files. However, we aren't very good at checking this in single-shot mode. `tcHiBootIface` makes something of an attempt, but the logic there will fail if the compiler hasn't seen any SOURCE imports of the module being compiled (since the module will have no entry in `eps_is_boot`, leading `tcHiBootIface` to conclude that the module simply has no boot file). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14481#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler