Trouble building GHC

Wed May 31 07:13:03 UTC 2023

Hi Lyle,

I'm sorry that you have so much trouble in getting your first build done.
The Classes.hi issue sounds like something I had experienced in the past,
but I'm not having it at the moment.
Are you also using symlinks by any chance? Then it is very likely that you
have been bitten by https://gitlab.haskell.org/ghc/ghc/-/issues/22451, the
workaround to which would be to do something like `cd "$(readlink -f .)"`
before you start your build.

Regarding your second issue using ghc.nix, a quick google turned up
https://gitlab.haskell.org/ghc/ghc/-/issues/20429#note_379762.
Is it possible that you didn't start from a clean build?
E.g., at the least you should `rm -rf _build` (note that `hadrian/cabal
clean` sadly is insufficient IIRC for reasons I don't recall).
I often simply do `git clean -fxd` to be extra sure.
After that, you'll have to boot, configure (including passing
$CONFIGURE_ARGS) and build again.
By the way, are you using ZSH? I'm using it and I have to pass the
CONFIGURE_ARGS in a slightly different way
<https://github.com/alpmestan/ghc.nix#building-ghc>: `./configure
${=CONFIGURE_ARGS}`.

I also updated
https://gitlab.haskell.org/ghc/ghc/-/wikis/building/preparation/linux#nixnixos
to account for new-style flakified builds+direnv, if that's a workflow that
you are familiar with.

Hope that helps,
Sebastian

Am Mi., 31. Mai 2023 um 05:14 Uhr schrieb Lyle Kopnicky <lists at qseep.net>:

> Hi folks, I’m new here. I’ll be attending the GHC Contributors’ Workshop
> next week, and in preparation, I’m trying to build GHC, both the native
> code backend and the JS backend. So far, I’ve only tried to build it with
> the native code backend, but I haven’t been able to get it to work. I’ve
> gotten help from some friendly folks on the #ghc channel on Matrix, and
> made some progress, but I’m still stuck.
>
> Is there anyone here who could be a point person for helping me get it to
> build? BTW I’m located on the west coast of the US (until next week when
> I’ll be in Switzerland), so time lag may be a factor.
>
> I’m using a Mac with aarch64 and macOS 13.3. Here are some of the things
> I’ve tried, and issues I’ve run into:
>
>
>    - Started with the advice from this wiki:
>    https://gitlab.haskell.org/ghc/ghc/-/wikis/building
>    - Checked out the ghc source, on HEAD.
>    - The rest of the steps were at
>    https://gitlab.haskell.org/ghc/ghc/-/wikis/building/preparation/mac-osx
>    - Already had Apple’s command line tools, but when I tried to do
>    operations using them, I got an error saying I needed the full Xcode, so I
>    installed that.
>    - brew install autoconf automake python sphinx-doc
>       - Worked fine, also added sphinx-build to the path
>    - Initially tried using ghc 9.2.7 to build - later tried switching to
>    9.4.4 and eventually 9.4.5
>    - cabal update; cabal install alex happy haddock
>    - This is where I ran into trouble - couldn’t build haddock. Cabal
>       said it couldn’t resolve the dependencies.
>       - I tried switching to ghc 9.4.4 and cabal 3.10.1.0 - same problem
>       - User romes (Rodrigo) on #ghc helped with this - was able to
>       reproduce it and filed a ticket:
>       https://github.com/haskell/haddock/issues/1596
>       - However he pointed out that haddock was already supplied through
>       ghcup so I don’t need to build it.
>    - Already had MacTex installed and I installed the DejaVu font family.
>    - ./boot && ./configure
>       - Worked fine, although ./boot gave me lots of autoconf warnings
>       like:
>       configure.ac:9: warning: The macro `AC_HELP_STRING' is obsolete.
>       configure.ac:9: You should run autoupdate.
>       - Apparently autoconf has renamed these macros to pluralize them,
>       and also encloses the arguments in square brackets.
>    - hadrian/build
>       - Ran into another problem: The build failed with:
>       Error, file does not exist and no rule available:
>
>       /Users/lyle/devel/haskell/ghc/_build/stage1/libraries/ghc-prim/build/GHC/Classes.hi
>       - Rodrigo helped me out with this. Introduced me to other build
>       flags like -j —flavour-quick.
>       - The issue proved quite persistent, but it might fail on different
>       .hi files.
>       - It turns out if you ask Hadrian to build that specific file, it
>       works. So somehow it can find a rule! Then you can proceed to rebuild and
>       it will fail on a different .hi file. Obviously it would be tedious
>       to do this for all the possible files it can fail on.
>       - I also tried not building profiled libraries.
>       - I tried, instead of using the Apple toolchain, using llvm 12,
>       then llvm 16. But I got different errors from that.
>       - Rodrigo was unable to reproduce the issue.
>    - So, I thought I’d try the Nix approach.
>    - First I had to repair my nix installation, because apparently
>    updating macOS overwrites /etc/zshrc, overwriting the bit that sources
>    '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh’
>    - Nix reminded me when I ran commands that I needed to add the
>    flag '--extra-experimental-features nix-command’ and
>    sometimes '--extra-experimental-features flakes’
>    - The instructions from the wiki
>    <https://gitlab.haskell.org/ghc/ghc/-/wikis/building/preparation/mac-osx>
>    didn’t work, got an error:
>       -
>       - nix build -f .gitlab/darwin/toolchain.nix -o toolchain.sh
>       --extra-experimental-features nix-command
>       - error: cannot evaluate a function that has an argument without a
>       value ('system’)
>    - But folks on #ghc recommended I use ghc.nix instead
>       - Pointed me to https://ghc.dev/
>       - That linked to these instructions:
>       https://github.com/alpmestan/ghc.nix#building-ghc
>       - But those instructions failed with:
>          - error: nix-shell requires a single derivation
>          - User Artem said my command was wrong, instead recommended:
>          - nix develop
>          https://github.com/alpmestan/ghc.nix/archive/master.tar.gz
>       - Once I added the magic experimental flags…
>       - It failed, with:
>          - error: NAR hash mismatch in input
>          'github:commercialhaskell/all-cabal-hashes/02bb1361217e690d83af9cc132b1d2bf2096763c'
>          (/nix/store/zbav3qqbyz7mn7rh4iwybs0ni01ppdbj-source), expected
>          'sha256-HdAnlSc4U8ftnZrBZr2CewsPQs03V9K2gkTVHKG8IfA=', got
>          'sha256-86BgvJ+ebMxTp+nPxo659hsNJbhE6CYJWiIbQXX+sBM=
>          - User MangoIV helped me out with this.
>       - First I tried regenerating the lock file, with nix flake update.
>          - Didn’t fix the problem.
>       - Then, I checked out the branch update_flake_lock_action
>          - This is apparently a branch designed to fix the problem
>          - Didn’t fix the problem
>       - Then I regenerated the lock file again, with nix flake update
>          - That worked! Well, at least that got me to a ghc.nix prompt
>       - So, I did:
>          - ./boot
>          - ./configure
>          - cabal v2-update
>          - hadrian/build -j --flavour=quick
>          - It chugged along for quite a while. Sadly, it ended with this
>       error:
>          -
>          - Linking
>          /Users/lyle/Sync/devel/haskell/ghc/hadrian/dist-newstyle/build/aarch64-osx/ghc-9.2.4/hadrian-0.1.0.0/x/hadrian/build/hadrian/hadrian
>          ...
>          Data.Binary.Get.runGet at position 1181: Unknown encoding for
>          constructor
>       - What also worries me is that I thought I read somewhere that
>       ghc.nix doesn’t work for cross-compilers, so even if it works for
>       the native backend, it may not work for the JS backend.
>
>
> Any help would be much appreciated!
> — Lyle
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