Re: Troubles when building ghc

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 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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