From e117f78ef3cd392bd9e00344188931f35fa4c968 Mon Sep 17 00:00:00 2001
From: tegwick <bernd.worsch@gmail.com>
Date: Sat, 2 May 2026 00:06:31 +0200
Subject: [PATCH] chore(debug): force -j1 to serialize GHC parallel code
 generation

With -j8, GHC generates code for 8 modules in parallel. A parallel merging
step might read combined objects via Data.Binary.Get hitting 287 MB. Forcing
-j1 serializes codegen to test if parallel merging is the crash cause.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 flake.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/flake.nix b/flake.nix
index 813a6e9..5543231 100644
--- a/flake.nix
+++ b/flake.nix
@@ -125,7 +125,7 @@
                                                "--ghc-option=-O0"
                                                "--ghc-option=-fomit-interface-pragmas"
                                                "--disable-split-sections"
-                                               "--ghc-option=-fno-dynamic-too"
+                                               "--ghc-option=-j1"
                                            ];
                                            postUnpack = (old.postUnpack or "") + ''
                                                _actual="$sourceRoot/build/Generated/ActualTypes.hs"