Thank you for that. After downgrading alex I was able to build ghc properly.
By the way, is there a way from cabal to uninstall a package? I actually had both versions of alex on my machine but somehow ghc would always pick up the latest one. I couldn't find a way to uninstall alex, so I just gave up and removed the entire cabal directory and reinstalled everything (which fortunately wasn't much) plus the old version of alex. Neo On Wed, Dec 23, 2020 at 9:12 PM John Ericson <john.ericson@obsidian.systems> wrote: > Actually, your alex is *too* new. See > https://gitlab.haskell.org/ghc/ghc/-/merge_requests/4657. If you take the > latest master, it will contain that, and your problem will be fixed. > On 12/23/20 2:10 PM, Richard Eisenberg wrote: > > Without having particular knowledge about this specific error: try > upgrading `alex`, the tool that GHC uses to produce its lexer. It's > possible a newer version of that tool will fix this problem. > > Richard > > On Dec 23, 2020, at 1:37 PM, Neophytos Michael <nmich...@gmail.com> wrote: > > I am having some trouble building ghc on ubuntu. I have ghc 8.8.4 > installed on the machine. I pulled from the main repository and followed > the instructions here: > https://gitlab.haskell.org/ghc/ghc/-/wikis/building/hadrian > > Building with: > ./hadrian/build -j > > it builds for a long time until it finally fails with the message below. > I would appreciate some advice on how to fix this. > > Thank you, > Neo > > =========================== > Exit code: 1 > Stderr and Stdout: > _build/stage1/compiler/build/GHC/Parser/Lexer.hs:3495:3: error: > Variable not in scope: int16ToInt# :: Int# -> Int# > | > 3495 | int16ToInt# > | ^^^^^^^^^^^ > > _build/stage1/compiler/build/GHC/Parser/Lexer.hs:3520:3: error: > Variable not in scope: int32ToInt# :: Int# -> Int# > | > 3520 | int32ToInt# > | ^^^^^^^^^^^ > =========================== > On that line (in Lexer.hs) we see: > > #if __GLASGOW_HASKELL__ >= 901 > int16ToInt# > #endif > (indexInt16OffAddr# arr off) > #endif > > so we are in the "then" clause and somehow "int16ToInt#" is nowhere to be > found. > > -- > Neo > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > > > _______________________________________________ > ghc-devs mailing > listghc-devs@haskell.orghttp://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > -- Neophytos
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