M1 Mac support

[srid]

Make nix build (and bin/run) succeed on M1 Mac with native Nix installed.

No rosetta.

• nix build works
• nix develop works, with HLS, ormolu, etc.
• GitHub CI (pending on Support for VMs on Apple M1 actions/runner-images#2187 )

[srid]

diff --git a/flake.lock b/flake.lock
index 60b86d5..4b2a246 100644
--- a/flake.lock
+++ b/flake.lock
@@ -33,11 +33,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1637533542,
-        "narHash": "sha256-9jR9AOz4OZf4IxMdIgveOur8n5WbZJBAXtXOe434l78=",
+        "lastModified": 1637882183,
+        "narHash": "sha256-J2PoXItGsstIP4NoI36ipEgZMP8Hhht0HmwtvFyBHA0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b2181bc967053310657128d687e44ec683e7604b",
+        "rev": "96cf0b7f273370aaa4cdef40e0282a139170cba3",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index a927662..e151796 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,7 +8,7 @@
     };
   };
   outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
-    flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" ] (system:
+    flake-utils.lib.eachSystem [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" ] (system:
       let
         overlays = [ ];
         pkgs =
@@ -27,11 +27,11 @@
               pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
               [
                 # Specify your build/dev dependencies here.
-                cabal-fmt
+                # cabal-fmt
                 cabal-install
-                ghcid
-                haskell-language-server
-                ormolu
+                # ghcid
+                # haskell-language-server
+                # ormolu
                 pkgs.nixpkgs-fmt
               ]);
           };

---

/nix/store/7vjmcgcxm0jy0w2jsyk99n0kiq52q296-compiler-rt-libc-9.0.1.drv failed to build:

[ 48%] Building C object lib/builtins/CMakeFiles/clang_rt.cc_kext_arm64_osx.dir/floatsidf.c.o
/tmp/nix-build-compiler-rt-libc-9.0.1.drv-0/compiler-rt-9.0.1.src/lib/sanitizer_common/sanitizer_platform_limits_posix.cc:168:31: error: invalid application of 'sizeof' to an incomplete
  unsigned struct_stat64_sz = sizeof(struct stat64);
                              ^     ~~~~~~~~~~~~~~~
/tmp/nix-build-compiler-rt-libc-9.0.1.drv-0/compiler-rt-9.0.1.src/lib/sanitizer_common/sanitizer_platform_limits_posix.cc:168:45: note: forward declaration of '__sanitizer::stat64'
  unsigned struct_stat64_sz = sizeof(struct stat64);
                                            ^
/tmp/nix-build-compiler-rt-libc-9.0.1.drv-0/compiler-rt-9.0.1.src/lib/sanitizer_common/sanitizer_platform_limits_posix.cc:194:33: error: invalid application of 'sizeof' to an incomplete
  unsigned struct_statfs64_sz = sizeof(struct statfs64);
                                ^     ~~~~~~~~~~~~~~~~~
/tmp/nix-build-compiler-rt-libc-9.0.1.drv-0/compiler-rt-9.0.1.src/lib/sanitizer_common/sanitizer_platform_limits_posix.cc:194:47: note: forward declaration of '__sanitizer::statfs64'
  unsigned struct_statfs64_sz = sizeof(struct statfs64);
                                              ^
[ 49%] Building C object lib/builtins/CMakeFiles/clang_rt.builtins_arm64_osx.dir/fixunsdfdi.c.o
2 errors generated.
make[2]: *** [lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoHooks.osx.dir/build.make:370: lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoHooks.osx.dir/sanitizer_platform_limits_
make[1]: *** [CMakeFiles/Makefile2:851: lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoHooks.osx.dir/all] Error 2

[srid]

I should note this happens in nix-shell and not nix-build: NixOS/nixpkgs#147739

[srid]

After advancing Nixpkgs,

[srid]

@sternenseemann - Any chance I can entertain your interest in this?

I advanced Nixpkgs past your NixOS/nixpkgs#147260 hoping that that might fix it (maybe it fix the llvm error above), but still I can't build even cabal2nix (fails at th-abstraction). As an aside, I wonder why cabal2nix's dependencies are not cached.

[sternenseemann]

Any chance I can entertain your interest in this?

I entertain the littlest interest in aarch64-darwin possible to be honest, I don't have no M1 machine nor plan purchasing one, so the whole platform just causes me a lot of annoyance I can't do anything about…

maybe it fix the llvm error above

Indeed, LLVM 9 was used for haskellPackages before which did not support aarch64-darwin at all. LLVM >= 11 should support it though, hence the build failure disappears.

but still I can't build even cabal2nix (fails at th-abstraction).

Looking at the error it seems to me that this might be some kind of code signing issue, you should be able to confirm this using the log(1) utility. My first instinct was that this was due to execution of the test suite, but this doesn't seem to be the case as ./Setup actually gets killed, at seemingly random places in other builds. Interestingly this seemingly only started happening after upgrading LLVM, e. g. th-abstraction was building with LLVM 9.

At this point, I can't really guess what the issue might be. Worth a try might be recompiling GHC and the package set using LLVM 11.

Regrettably, the contributed support for aarch64-darwin has been limited to getting GHC to compile and very little work has gone into actually making the packages produced by it work properly.

As an aside, I wonder why cabal2nix's dependencies are not cached.

Well, it is kind of hard to cache dependencies that don't build.

[sternenseemann]

Should be fixed on current nixpkgs master.

[srid]

Awesome, @sternenseemann ! 🕺🏿

It mostly works now after a0672b6. One final thing left to resolve is build failures for ghcid, ormolu, etc (see below) ... but nix build with these build tools commented out works.

error: cycle detected in build of '/nix/store/am90h7yjq0jdk5ha80r2gwq5xs1kqfnl-ghcid-0.8.7.drv' 
  in the references of output 'bin' from output 'out'

Looks to be this issue: NixOS/nixpkgs#140774

[sternenseemann]

Looks to be this issue: NixOS/nixpkgs#140774

Yes.