From ce20ef1ea9b30e9fa19ed8b019953a677d5a8add Mon Sep 17 00:00:00 2001
From: zowoq <59103226+zowoq@users.noreply.github.com>
Date: Sun, 28 Sep 2025 12:04:39 +1000
Subject: [PATCH] zfs_2_3: fix building with llvm 21

---
 pkgs/os-specific/linux/zfs/2_3.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/os-specific/linux/zfs/2_3.nix b/pkgs/os-specific/linux/zfs/2_3.nix
index 7c175ba48a46..224070a720d1 100644
--- a/pkgs/os-specific/linux/zfs/2_3.nix
+++ b/pkgs/os-specific/linux/zfs/2_3.nix
@@ -3,6 +3,7 @@
   lib,
   nixosTests,
   stdenv,
+  fetchpatch,
   ...
 }@args:
 
@@ -17,6 +18,14 @@ callPackage ./generic.nix args {
   # this package should point to the latest release.
   version = "2.3.4";
 
+  extraPatches = [
+    (fetchpatch {
+      name = "fix_llvm-21_-wuninitialized-const-pointer_warning.patch";
+      url = "https://github.com/openzfs/zfs/commit/9acedbaceec362d08a33ebfe7c4c7efcee81d094.patch";
+      hash = "sha256-bjMRuT8gsMuwCnrS5PfG9vYthRvcFaWCCfQbCTVZdpw=";
+    })
+  ];
+
   tests = {
     inherit (nixosTests.zfs) series_2_3;
   }