From 18c4d365af29e6ad939f57bd5cdef19af3d28afc Mon Sep 17 00:00:00 2001
From: ners <ners@gmx.ch>
Date: Sat, 16 Nov 2024 13:00:01 +0100
Subject: [PATCH] Build monad-schedule without parallelism in CI

---
 .github/workflows/ci.yml |  5 ++++-
 flake.nix                | 12 +++++++++---
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 132035d7..5eac7f1c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -132,7 +132,10 @@ jobs:
       - name: Flake check
         run: nix flake check
       - name: Build all packages
-        run: nix build --accept-flake-config
+        run: |
+          # Pre-build monad-schedule without parallelism to avoid timing issues under load
+          nix build --accept-flake-config --max-jobs 1 .#monad-schedule-lib
+          nix build --accept-flake-config
       - name: Run tests
         run: |
           nix develop --accept-flake-config -c cabal update
diff --git a/flake.nix b/flake.nix
index 63909265..e226d8d6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -64,9 +64,6 @@
                 }
                 { };
             })
-            (hfinal: hprev: lib.optionalAttrs prev.stdenv.isDarwin {
-              monad-schedule = dontCheck hprev.monad-schedule;
-            })
             (hfinal: hprev: lib.optionalAttrs (lib.versionOlder hprev.ghc.version "9.4") {
               time-domain = doJailbreak hprev.time-domain;
             })
@@ -142,6 +139,14 @@
                 (prev.linkFarm "docsAndSdist" { docs = final.rhine-docs; sdist = rhine-sdist; })
               ];
             };
+
+          # All monad-schedule libraries
+          monad-schedule-lib = prev.buildEnv
+            {
+              name = "monad-schedule-lib";
+              paths = map (hp: hp.monad-schedule) (attrValues hps);
+              pathsToLink = [ "/lib" ];
+            };
         };
 
       overlay = lib.composeManyExtensions
@@ -165,6 +170,7 @@
       # Usage: nix build
       packages = forAllPlatforms (system: pkgs: {
         default = pkgs.rhine-all;
+        monad-schedule = pkgs.monad-schedule-lib;
       });
 
       # We re-export the entire nixpkgs package set with our overlay.