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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://haskell4nix.readthedocs.io/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org148 Servers

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15 Mar 2026
@aiya:catgirl.cloudaiyaRedacted or Malformed Event18:55:13
16 Mar 2026
@maralorn:maralorn.demaralorn sterni: If we switch to nightly that means going to ghc 9.12, right? 10:35:06
@maralorn:maralorn.demaralornIs that safe in regards to the whole miscompilation thingy?10:35:22
@maralorn:maralorn.demaralorne.g. do we maybe want to wait for 9.12.4?10:35:36
@sternenseemann:systemli.orgsterni (he/him)We patched that in 9.12.3, but we could also wait for 9.12.410:35:48
@sternenseemann:systemli.orgsterni (he/him)Maybe it is sensible to wait for the next HLS release (which is coming soon right?) and the update10:36:47
@maralorn:maralorn.demaralornI don’t know. I am not aware of immediate plans.10:41:29
@maralorn:maralorn.demaralornIt seems likely that they would want to make a release after 9.12.4 to provide binaries.10:41:48
@maralorn:maralorn.demaralornBut I also wouldn’t be other than from it being discussed on the hls matrix channel.10:44:38
@sternenseemann:systemli.orgsterni (he/him)I just saw new versions of lsp and lsp-types so I assumed that was the reason10:44:58
@sternenseemann:systemli.orgsterni (he/him)in any case, most stuff I had on my mind we can do with LTS is done, what remains are things like pandoc 3.9 which are probably best addressed by jumping to nightly10:46:42
@sternenseemann:systemli.orgsterni (he/him)Also if anyone is interested in trying out 9.12.4-rc1 https://github.com/NixOS/nixpkgs/pull/50010811:10:27
@sternenseemann:systemli.orgsterni (he/him) alexfmpe: this was on darwin, right? https://github.com/NixOS/nixpkgs/pull/497811#issuecomment-4019565283 17:34:15
@alexfmpe:matrix.orgalexfmpeaaah yeah22:10:03
@alexfmpe:matrix.orgalexfmpeI forgot that threw off regen script22:10:13
@eveeifyeve:matrix.orgeveeifyeveI experienced this as well in this pr: https://github.com/NixOS/nixpkgs/pull/499983#issuecomment-406291605822:39:11
@eveeifyeve:matrix.orgeveeifyeve* I forgot to mention this, It's not just that pr is linked it's across globally: https://github.com/NixOS/nixpkgs/pull/499983#issuecomment-406291605822:40:10
@eveeifyeve:matrix.orgeveeifyeve* I forgot to mention this, It's not just that pr is linked it's across globally, because I was happened to reproduce it. Ref: https://github.com/NixOS/nixpkgs/pull/499983#issuecomment-406291605822:40:32
@alexfmpe:matrix.orgalexfmpeheh you barely missed 500k22:44:25
18 Mar 2026
@alex:tunstall.xyzAlex

It seems that we have a regression in pkgsCross.riscv64.buildPackages.ghc:

error: In file included from /nix/store/77digc4i0ny4i31cwns7zpirak96np5r-libffi-riscv64-unknown-linux-gnu-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/77digc4i0ny4i31cwns7zpirak96np5r-libffi-riscv64-unknown-linux-gnu-3.5.2-dev/include/ffitarget.h:36:2: error: #error "libffi was configured for a RIS
C-V target but this does not appear to be a RISC-V compiler."
   36 | #error "libffi was configured for a RISC-V target but this does not appear to be a RISC-V compiler."
      |  ^~~~~

(On latest nixpkgs-unstable)

sterni Is this known about?
We might need to bisect for the cause.

pkgsCross.riscv64.haskell.compiler.ghc94 still builds, but cross-compiling other Haskell packages has been a bit of a blind spot for me.

02:27:59
@alex:tunstall.xyzAlex *

It seems that we have a regression in pkgsCross.riscv64.buildPackages.ghc:

error: In file included from /nix/store/77digc4i0ny4i31cwns7zpirak96np5r-libffi-riscv64-unknown-linux-gnu-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/77digc4i0ny4i31cwns7zpirak96np5r-libffi-riscv64-unknown-linux-gnu-3.5.2-dev/include/ffitarget.h:36:2: error: #error "libffi was configured for a RIS
C-V target but this does not appear to be a RISC-V compiler."
   36 | #error "libffi was configured for a RISC-V target but this does not appear to be a RISC-V compiler."
      |  ^~~~~

(On latest nixpkgs-unstable)

sterni Is this known about?
We might need to bisect for the cause, assuming this ever worked.

pkgsCross.riscv64.haskell.compiler.ghc94 still builds, but cross-compiling other Haskell packages has been a bit of a blind spot for me.

02:30:11
@alex:tunstall.xyzAlex Reproducer: https://gist.github.com/colemickens/78af9a28c01b888726322ca6628b27f5 02:30:29
@alex:tunstall.xyzAlex I went back to 22.05 and it still failed.
Did this ever work? 		04:00:56
@alexfmpe:matrix.orgalexfmpeno clue but I've also seen FFI define errors for a few months now when trying to build for other archs04:21:32
@alexfmpe:matrix.orgalexfmpe 
$ nix-build -A pkgsCross.loongarch64-linux.haskellPackages.ghc
error: In file included from /nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffitarget.h:38:2: error: #error "libffi was configured for a LoongArch target but this does not appear to be a LoongArch compiler."
04:21:41
@alexfmpe:matrix.orgalexfmpehttps://github.com/libffi/libffi/blob/master/src/loongarch64/ffitarget.h#L39 https://github.com/libffi/libffi/blob/master/src/riscv/ffitarget.h#L3604:23:15
@alexfmpe:matrix.orgalexfmpeI do not see these "was configured" errors coming from symbol checks in x86 or aarch64 https://github.com/libffi/libffi/blob/master/src/x86/ffitarget.h https://github.com/libffi/libffi/blob/master/src/aarch64/ffitarget.h04:24:25
@alexfmpe:matrix.orgalexfmpe* https://github.com/libffi/libffi/blob/master/src/loongarch64/ffitarget.h#L39 https://github.com/libffi/libffi/blob/master/src/mips/ffitarget.h#L57 https://github.com/libffi/libffi/blob/master/src/riscv/ffitarget.h#L3604:37:11
@alexfmpe:matrix.orgalexfmpe * 
$ nix-build -A pkgsCross.loongarch64-linux.haskellPackages.ghc
error: In file included from /nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffitarget.h:38:2: error: #error "libffi was configured for a LoongArch target but this does not appear to be a LoongArch compiler."

$ nix-build -A pkgsCross.mips64-linux-gnuabi64.haskellPackages.ghc 
error: In file included from /nix/store/8q1grm46k375rmfmbzvsxnhzbakksf6n-libffi-mips64-unknown-linux-gnuabi64-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/8q1grm46k375rmfmbzvsxnhzbakksf6n-libffi-mips64-unknown-linux-gnuabi64-3.5.2-dev/include/ffitarget.h:57:3: error: #error -- something is very wrong --
   57 | # error -- something is very wrong --
      |   ^~~~~
04:38:46
@alexfmpe:matrix.orgalexfmpe * 
$ nix-build -A pkgsCross.loongarch64-linux.haskellPackages.ghc
error: In file included from /nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffitarget.h:38:2: error: #error "libffi was configured for a LoongArch target but this does not appear to be a LoongArch compiler."
   38 | #error \
      |  ^~~~~
/nix/store/kn3j1mjbcj7w39h0s0wgxxhchw3gg56f-libffi-loongarch64-unknown-linux-gnu-3.5.2-dev/include/ffitarget.h:66:2: error: #error unsupported LoongArch base architecture
   66 | #error unsupported LoongArch base architecture
      |  ^~~~~

$ nix-build -A pkgsCross.mips64-linux-gnuabi64.haskellPackages.ghc 
error: In file included from /nix/store/8q1grm46k375rmfmbzvsxnhzbakksf6n-libffi-mips64-unknown-linux-gnuabi64-3.5.2-dev/include/ffi.h:84,
                 from FFI.hsc:33:
/nix/store/8q1grm46k375rmfmbzvsxnhzbakksf6n-libffi-mips64-unknown-linux-gnuabi64-3.5.2-dev/include/ffitarget.h:57:3: error: #error -- something is very wrong --
   57 | # error -- something is very wrong --
      |   ^~~~~
04:41:10

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