warp-3.4.0 failed to build with Cabal on macOS

[SpeedyOrc-C]

This project failed to build warp-3.4.0 as a dependency when building with Cabal.

Environment

macOS: 14.4.1 (23E224) GHC: 9.8.2 Cabal: 3.10.3.0 Kernel:

Darwin DESKTOP-CHENZHANMING-OSX.local 23.4.0
Darwin Kernel Version 23.4.0: Fri Mar 15 00:11:05 PDT 2024;
root:xnu-10063.101.17~1/RELEASE_X86_64 x86_64

Error message

Network/Wai/Handler/Warp/Settings.hs:307:20: error: [GHC-83865]
    • Couldn't match expected type: GHC.Prim.State# GHC.Prim.RealWorld
                                    -> (# GHC.Prim.State# GHC.Prim.RealWorld, a0 #)
                  with actual type: IO ()
    • In the first argument of ‘fork#’, namely ‘(io unsafeUnmask)’
      In the expression: fork# (io unsafeUnmask) s0
      In the expression:
        case fork# (io unsafeUnmask) s0 of (# s1, _tid #) -> (# s1, () #)
    |
307 |         case fork# (io unsafeUnmask) s0 of
    |                    ^^^^^^^^^^^^^^^^^
Error: cabal: Failed to build warp-3.4.0 (which is required by
exe:irminsul-api from irminsul-api-0.1.0.0). See the build log above for
details.

It seems that the condition __GLASGOW_HASKELL__ >= 904 of the #if macro wasn't working.

[kazu-yamamoto]

I tries to reproduce this with GHC 9.8.2 on macOS 14.4.1 on my M2 mac. But I could not reproduce this. The build successes.

[SpeedyOrc-C]

My Mac is Intel-based :(

[kazu-yamamoto]

I don't understand why intel-based mac gets the wrong macro.

[gfarrell]

I get the same error on GHC 9.4.8 (archlinux x86_64) but it builds fine on 9.4.7:

Network/Wai/Handler/Warp/Settings.hs:307:20: error:
    • Couldn't match expected type: GHC.Prim.State# GHC.Prim.RealWorld
                                    -> (# GHC.Prim.State# GHC.Prim.RealWorld, a0 #)
                  with actual type: IO ()
    • In the first argument of ‘fork#’, namely ‘(io unsafeUnmask)’
      In the expression: fork# (io unsafeUnmask) s0
      In the expression:
        case fork# (io unsafeUnmask) s0 of (# s1, _tid #) -> (# s1, () #)
    |
307 |         case fork# (io unsafeUnmask) s0 of
    |                    ^^^^^^^^^^^^^^^^^
Error: cabal: Failed to build warp-3.4.0 (which is required by
exe:gtf-website-server from gtf-website-0.1.0.0). See the build log above for
details.

[georgefst]

I'm seeing this on GHC 9.6.4, also on x86_64 Arch Linux.

[kazu-yamamoto]

No problem with GHC 9.6.4 on x86_64 CentOS.

[georgefst]

Well, I've run out of time for investigating this right now, but it's pretty bizarre. The macros seem to pick up the GHC version installed from the Arch repos rather than the GHCup-installed version (9.2 vs 9.6 in my case), despite the latter having precedence in my PATH and clearly being used (log shows Build profile: -w ghc-9.6.4 -O1). This issue isn't actually specific to warp. It occurs for any project which depends on streaming-commons...

[kazu-yamamoto]

Please bring this to streaming-commons. Let's close.

[Iizuki]

Well, I've run out of time for investigating this right now, but it's pretty bizarre. The macros seem to pick up the GHC version installed from the Arch repos rather than the GHCup-installed version (9.2 vs 9.6 in my case), despite the latter having precedence in my PATH and clearly being used (log shows Build profile: -w ghc-9.6.4 -O1). This issue isn't actually specific to warp. It occurs for any project which depends on streaming-commons...

I don't really understand what's going on here, but based on this uninstalling the system ghc solved the issue for me.

Did someone open up an issue at the correct place?

[georgefst]

I've got my findings half written up. Will post to Cabal in the next few days.

Basically it's interference from the system GHC. Quick fix is pacman -R ghc. EDIT: just noticed you've already mentioned this!