#11784: panic "hscCmmFile: no_mod" with `-v2 and above -------------------------------------+------------------------------------- Reporter: erikd | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Initailly found this on powerpc when debugging #11773, but it also happens on x86_64. The command line: {{{ inplace/bin/ghc-stage1 -static -H64m -O0 -Wall -v2 -Iincludes \ -Iincludes/dist -Iincludes/dist-derivedconstants/header \ -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build \ -DCOMPILING_RTS -this-unit-id rts -optc-DNOSMP -dcmm-lint -i -irts \ -irts/dist/build -irts/dist/build/autogen -Irts/dist/build \ -Irts/dist/build/autogen -O2 -Wnoncanonical-monad-instances -c\ rts/StgStartup.cmm -o rts/dist/build/StgStartup.o }}} panics with a message: {{{ ghc-stage1: panic! (the 'impossible' happened) (GHC version 8.1.20160402 for powerpc-unknown-linux): hscCmmFile: no_mod }}} The only thing that was added to the command line that is different from the normal build command is the `-v2`. This is caused by the code (in compiler/main/HscMain.hs): {{{ no_mod = panic "hscCmmFile: no_mod" }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11784 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler