Troubles when building ghc

[John Ericson]

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 
>> <mailto: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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>
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