Troubles when building ghc

[Neophytos Michael]

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 at 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 <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
>
> 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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-- 
Neophytos
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