#16379: JuicyPixels build panics on s390x ghc-8.4.4 -------------------------------------+------------------------------------- Reporter: juhpetersen | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.4.4 Keywords: | Operating System: Linux Architecture: | Type of failure: Compile-time Unknown/Multiple | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When I try to build JuicyPixels on Fedora s390x Linux with ghc-8.4.4 I get a compiler panic: {{{ [ 9 of 30] Compiling Codec.Picture.ColorQuant ( src/Codec/Picture/ColorQuant.hs, dist/build/Codec/Picture/ColorQuant.o ) BUILDSTDERR: src/Codec/Picture/ColorQuant.hs:123:26: warning: [-Woverflowed-literals] BUILDSTDERR: Literal 256 is out of the GHC.Word.Word8 range 0..255 BUILDSTDERR: | BUILDSTDERR: 123 | (PixelRGB8 (r .&. (256 - dr)) (g .&. (256 - dg)) (b .&. (256 - db))) BUILDSTDERR: | ^^^ BUILDSTDERR: src/Codec/Picture/ColorQuant.hs:123:45: warning: [-Woverflowed-literals] BUILDSTDERR: Literal 256 is out of the GHC.Word.Word8 range 0..255 BUILDSTDERR: | BUILDSTDERR: 123 | (PixelRGB8 (r .&. (256 - dr)) (g .&. (256 - dg)) (b .&. (256 - db))) BUILDSTDERR: | ^^^ BUILDSTDERR: src/Codec/Picture/ColorQuant.hs:123:64: warning: [-Woverflowed-literals] BUILDSTDERR: Literal 256 is out of the GHC.Word.Word8 range 0..255 BUILDSTDERR: | BUILDSTDERR: 123 | (PixelRGB8 (r .&. (256 - dr)) (g .&. (256 - dg)) (b .&. (256 - db))) BUILDSTDERR: | ^^^ BUILDSTDERR: ghc: panic! (the 'impossible' happened) BUILDSTDERR: (GHC version 8.4.4 for s390x-ibm-linux): BUILDSTDERR: pprStatics: float BUILDSTDERR: F32 BUILDSTDERR: F32 BUILDSTDERR: I32 BUILDSTDERR: Call stack: BUILDSTDERR: CallStack (from HasCallStack): BUILDSTDERR: callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable BUILDSTDERR: pprPanic, called at compiler/cmm/PprC.hs:525:5 in ghc:PprC BUILDSTDERR: Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I would test on ghc-8.6.3 too, but I haven't been able to build ghc-8.6 yet on s390x (unregisterized on unregisterized): see issue 15913. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16379 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler