Is MacOS no longer supported?

[santiweight]

As of MacOS Big Sur I get the following error:

ld: file not found: /usr/lib/system/libcache.dylib for architecture x86_64
when adding any dependency to my obelisk project. That's the weird part to me - the minimal ob init project works just fine, but adding any dependency to any cabal file causes the following stack trace:

[1 of 1] Compiling Main             ( Setup.hs, /private/tmp/nix-build-hscolour-1.24.4.drv-0/Main.o )
Linking Setup ...
ld: file not found: /usr/lib/system/libcache.dylib for architecture x86_64
clang-7: error: linker command failed with exit code 1 (use -v to see invocation)
`cc' failed in phase `Linker'. (Exit code: 1)
builder for '/nix/store/81sjwgpi807wiwzq66qyrji2gb74ysqr-hscolour-1.24.4.drv' failed with exit code 1

There is an issue here already. It really sucks for me because I am trying to revive old code, but I am unable to use nix/ob. I wonder if this is a nix issue? But I imagine some of Obsidian's engineers use MacOS - how do you handle Big Sur?

Relevant issue - #832

[o1lo01ol1o]

It looks like this is an upstream issue in nixpkgs: NixOS/nixpkgs#91748. To fix it, obelisk and reflex-dom will need to be moved to a more recent nixpkgs pin (21.05?) to use a more recent linker.

[Ericson2314]

Thanks @o1lo01ol1o for investigating. We have indeed started bumping obelisk and reflex platform to get to a newer Nixpkgs, but it is a slog.

[o1lo01ol1o]

@Ericson2314 I've started to backport an existing fix to the reflex-platform-20.09 branch of nixpkgs. I'm currently building the world, but if it works out I'll open a PR.

[Ericson2314]

Glad to hear it, thanks for your efforts!!

[o1lo01ol1o]

Attempting to use the above pins on #867 built quite a bit and then failed to find Cocoa when building ob command. This appears to be https://gitlab.haskell.org/ghc/ghc/-/issues/18446.

I'm rolling the dice and trying to build off https://github.com/obsidiansystems/obelisk/tree/ll/ghc8_10 now but I have no idea what the state is of the ghc 8.10 work in obelisk (or reflex-platform for that matter).

[santiweight]

Wow thank you for the awesome investment into this issue @o1lo01ol1o

I think there is already a good amount of work invested into ghc-8.10 on both reflex-platform and obelisk (I'm not an Obsidian employee however), so I wonder whether it might be more profitable to push that effort, since I get the impression that 8.6.5 is soon to breathe its last breaths (my impression from obelisk/HLS/other OSS work)

[o1lo01ol1o]

FWIW I was able to enter into a ob shell using an obelisk branch based off the above ghc8_10 work and a similarly pinned rhyolite here on big sur.

I'm still dealing with dependency issues so haven't been able to confirm that ob deploy works. (I would likewise expect that mobile builds fail, but I could be wrong.)

[o1lo01ol1o]

nix-build -A exe on a dummy project with BeFunctional@3771019 cause GHCJS to throw more than a few segfaults while builing dependencies on our nixos system.

[o1lo01ol1o]

@Ericson2314 Just checking to see if this issue is stale. We don't currently have a mac on big sur +; have you had any luck building obelisk there?