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.

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 <nmichael@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

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