From 930e45f4365951f56525da65557509e339c3f0e9 Mon Sep 17 00:00:00 2001
From: Seyon Sivarajah <seyon.sivarajah@cambridgequantum.com>
Date: Fri, 10 Nov 2023 10:54:41 +0000
Subject: [PATCH] chore: use llvm pacakge to enable local cov with devenv
 (#232)

---
 devenv.lock | 26 ++++++++++++++++++++++----
 devenv.nix  | 20 ++++++++++++++------
 devenv.yaml |  4 +++-
 3 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/devenv.lock b/devenv.lock
index ab437e51..d39acf47 100644
--- a/devenv.lock
+++ b/devenv.lock
@@ -25,15 +25,16 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1699510895,
-        "narHash": "sha256-eaOkJUvHeYNW/xEoRotz0rHkKihKoQdWB1ctX4q1MTQ=",
+        "lastModified": 1698819743,
+        "narHash": "sha256-L3vZfifHmog7sJvzXk8qiKISkpyltb+GaThqMJ7PU9Y=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "8eeef23f2c8d092227af40eff98afe5b41891e3b",
+        "rev": "1a92c6d75963fd594116913c23041da48ed9e020",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
+        "ref": "monthly",
         "repo": "fenix",
         "type": "github"
       }
@@ -110,6 +111,22 @@
       }
     },
     "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1699291058,
+        "narHash": "sha256-5ggduoaAMPHUy4riL+OrlAZE14Kh7JWX4oLEs22ZqfU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "41de143fda10e33be0f47eab2bfe08a50f234267",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable_2": {
       "locked": {
         "lastModified": 1685801374,
         "narHash": "sha256-otaSUoFEMM+LjBI1XL/xGB5ao6IwnZOXc47qhIgJe8U=",
@@ -133,7 +150,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "nixpkgs-stable": "nixpkgs-stable"
+        "nixpkgs-stable": "nixpkgs-stable_2"
       },
       "locked": {
         "lastModified": 1699271226,
@@ -154,6 +171,7 @@
         "devenv": "devenv",
         "fenix": "fenix",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-stable": "nixpkgs-stable",
         "pre-commit-hooks": "pre-commit-hooks"
       }
     },
diff --git a/devenv.nix b/devenv.nix
index ed24e6e0..85483656 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -1,15 +1,21 @@
-{ pkgs, lib, config, ... }:
-
+{ pkgs, lib, config, inputs, ... }:
+let
+  pkgs-stable = import inputs.nixpkgs-stable { system = pkgs.stdenv.system; };
+in
 {
-
   # https://devenv.sh/packages/
   # on macos frameworks have to be explicitly specified 
   # otherwise a linker error ocurs on rust packages
-  packages = [ pkgs.just ]
-    ++ lib.optionals pkgs.stdenv.isLinux [
+  packages = [
+    pkgs.just
+    pkgs.llvmPackages_16.libllvm
+    # cargo-llvm-cov is currently marked broken on nixpkgs unstable
+    pkgs-stable.cargo-llvm-cov
+  ]
+  ++ lib.optionals pkgs.stdenv.isLinux [
     pkgs.stdenv.cc.cc.lib
   ]
-    ++ lib.optionals pkgs.stdenv.isDarwin (
+  ++ lib.optionals pkgs.stdenv.isDarwin (
     with pkgs.darwin.apple_sdk; [
       frameworks.CoreServices
       frameworks.CoreFoundation
@@ -28,6 +34,8 @@
     cargo --version
     python --version
     poetry --version
+    export LLVM_COV="${pkgs.llvmPackages_16.libllvm}/bin/llvm-cov"
+    export LLVM_PROFDATA="${pkgs.llvmPackages_16.libllvm}/bin/llvm-profdata"
   '';
 
   # https://devenv.sh/languages/
diff --git a/devenv.yaml b/devenv.yaml
index b8fc6397..3769b06c 100644
--- a/devenv.yaml
+++ b/devenv.yaml
@@ -1,6 +1,8 @@
 inputs:
+  nixpkgs-stable:
+    url: github:NixOS/nixpkgs/nixos-23.05
   fenix:
-    url: github:nix-community/fenix
+    url: github:nix-community/fenix/monthly
     inputs:
       nixpkgs:
         follows: nixpkgs
\ No newline at end of file