Troubles when building ghc

[Richard Eisenberg]

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 at 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 <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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