cmdstan: add aarch64-darwin support

pkgs/development/compilers/cmdstan/default.nix

@@ -1,25 +1,18 @@
-{ lib, stdenv, fetchurl, python3, runtimeShell }:
+{ lib, stdenv, fetchFromGitHub, stanc, python3, buildPackages, runtimeShell }:
 
-let
-  # FIXME: remove conditional on future release
-  version = if stdenv.isx86_64 then "2.31.0" else "2.30.1";
-  # includes stanc binaries needed to build cmdstand
-  srcs = rec {
-    aarch64-linux = fetchurl {
-      url = "https://github.com/stan-dev/cmdstan/releases/download/v${version}/cmdstan-${version}-linux-arm64.tar.gz";
-      sha256 = "sha256-oj/7JHT4LZcRAHiA2KbM6pZbOe6C98Ff//cNsG9DIm8=";
-    };
-    x86_64-darwin = fetchurl {
-      url = "https://github.com/stan-dev/cmdstan/releases/download/v${version}/cmdstan-${version}.tar.gz";
-      sha256 = "sha256-BMqRRWIC/Z7It2qkESJd9L3ycyxvA6NHiWbAvzVMzIQ=";
-    };
-    x86_64-linux = x86_64-darwin;
-  };
-  src = srcs.${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
-in
 stdenv.mkDerivation rec {
   pname = "cmdstan";
-  inherit version src;
+  version = "2.31.0";
+
+  src = fetchFromGitHub {
+    owner = "stan-dev";
+    repo = pname;
+    rev = "v${version}";
+    fetchSubmodules = true;
+    sha256 = "sha256-Uh/ZhEnbhQwC8xGFjDzH9No3VRgVbHYk2KoC+e3YhJw=";
+  };
+
+  nativeBuildInputs = [ stanc ];
 
   buildFlags = [ "build" ];
   enableParallelBuilding = true;
@@ -38,6 +31,13 @@ stdenv.mkDerivation rec {
       src/test/interface/stansummary_test.cpp
   '';
 
+  preConfigure = ''
+    mkdir -p bin
+    ln -s ${buildPackages.stanc}/bin/stanc bin/stanc
+  '';
+
+  makeFlags = lib.optional stdenv.isDarwin "arch=${stdenv.hostPlatform.darwinArch}";
+
   checkPhase = ''
     ./runCmdStanTests.py -j$NIX_BUILD_CORES src/test/interface
   '';
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
   # Hack to ensure that patchelf --shrink-rpath get rids of a $TMPDIR reference.
   preFixup = "rm -rf stan";
 
-  meta = {
+  meta = with lib; {
     description = "Command-line interface to Stan";
     longDescription = ''
       Stan is a probabilistic programming language implementing full Bayesian
@@ -66,7 +66,8 @@ stdenv.mkDerivation rec {
       likelihood estimation with Optimization (L-BFGS).
     '';
     homepage = "https://mc-stan.org/interfaces/cmdstan.html";
-    license = lib.licenses.bsd3;
-    platforms = [ "aarch64-linux" "x86_64-darwin" "x86_64-linux" ];
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ wegank ];
+    platforms = platforms.unix;
   };
 }

pkgs/development/compilers/stanc/default.nix

@@ -0,0 +1,41 @@
+{ lib
+, fetchFromGitHub
+, ocamlPackages
+}:
+
+ocamlPackages.buildDunePackage rec {
+  pname = "stanc";
+  version = "2.31.0";
+
+  minimalOCamlVersion = "4.12";
+
+  src = fetchFromGitHub {
+    owner = "stan-dev";
+    repo = "stanc3";
+    rev = "v${version}";
+    hash = "sha256-5GOyKVt3LHN1D6UysOZT8isVQLKexwEcK0rwI45dDcg=";
+  };
+
+  # Error: This expression has type [ `Use_Sys_unix ]
+  postPatch = ''
+    substituteInPlace test/integration/run_bin_on_args.ml \
+      --replace "if Sys.file_exists (to_windows path) then to_windows cmd else cmd" "cmd"
+  '';
+
+  buildInputs = with ocamlPackages; [
+    core_unix
+    menhir
+    menhirLib
+    ppx_deriving
+    fmt
+    yojson
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/stan-dev/stanc3";
+    description = "The Stan compiler and utilities";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ wegank ];
+    platforms = platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -15666,6 +15666,8 @@ with pkgs;
 
   stalin = callPackage ../development/compilers/stalin { };
 
+  stanc = callPackage ../development/compilers/stanc { };
+
   metaBuildEnv = callPackage ../development/compilers/meta-environment/meta-build-env { };
 
   svd2rust = callPackage ../development/tools/rust/svd2rust { };