I just built GHC myself with the same commit (32b4bf33989bdda4dffed1866f7a61a7da4ca275) and experienced the same
#9186: GHC panic when compiling compdata -------------------------------------+------------------------------------ Reporter: snoyberg | Owner: Type: bug | Status: new Priority: highest | Milestone: 7.8.3 Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by rwbarton): Replying to [comment:8 snoyberg]: problem with compdata. What steps exactly are you taking to encounter this error? Can you paste your relevant Cabal configuration? Are you using `-j` for either cabal- install or ghc? Also, I wonder if we could be seeing different behavior from the system linker. What distribution/version are you running? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9186#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler