From 0e05b394787272aec536aea38942cf43a5e6397b Mon Sep 17 00:00:00 2001
From: Dave Walker <dave@daviey.com>
Date: Sat, 11 Oct 2025 00:27:19 +0100
Subject: [PATCH] conduit: fix reproducibility by not leaking kernel version

Override CMAKE_SYSTEM_VERSION to prevent the build kernel version
from being embedded in the build output. This fixes non-reproducible
builds where CONDUIT_SYSTEM_TYPE would vary between builds
(e.g., "Linux-6.12.47" vs "Linux-6.16.9").

The fix follows the same approach used in Qt6 packages to ensure
reproducible builds across different build environments.

Fixes: #450434
---
 pkgs/by-name/co/conduit/package.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkgs/by-name/co/conduit/package.nix b/pkgs/by-name/co/conduit/package.nix
index 499802a528a2..e5172dd05976 100644
--- a/pkgs/by-name/co/conduit/package.nix
+++ b/pkgs/by-name/co/conduit/package.nix
@@ -36,6 +36,8 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   cmakeFlags = [
+    # Don't leak kernel version into the build output for reproducibility
+    "-DCMAKE_SYSTEM_VERSION="
     (lib.cmakeBool "ENABLE_MPI" mpiSupport)
   ];