From 6671aff83e4082f3a825c456cf259b9e30ae702c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Sat, 3 Jan 2015 12:29:52 +0100
Subject: [PATCH] linux kernel determinism: unify timestamp style

Testing showed the linux build is sensitive to /usr/include/ncursesw
unless chrooted (on non-nixos).
On a single chrooted nixos machine, -A linux is binary reproducible.

CC #2281 & @alexanderkjeldaas.
---
 pkgs/os-specific/linux/kernel/generic.nix       | 5 ++++-
 pkgs/os-specific/linux/kernel/manual-config.nix | 1 -
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/generic.nix b/pkgs/os-specific/linux/kernel/generic.nix
index af2ae3b54db4..b42892f9f2d8 100644
--- a/pkgs/os-specific/linux/kernel/generic.nix
+++ b/pkgs/os-specific/linux/kernel/generic.nix
@@ -57,7 +57,10 @@ let
     autoModules = stdenv.platform.kernelAutoModules;
     arch = stdenv.platform.kernelArch;
 
-    KBUILD_BUILD_TIMESTAMP = 1; # (time_t)1
+    preConfigure = ''
+        buildFlagsArray+=("KBUILD_BUILD_TIMESTAMP=Thu Jan 1 00:00:01 UTC 1970")
+    '';
+
     crossAttrs = let
         cp = stdenv.cross.platform;
       in {
diff --git a/pkgs/os-specific/linux/kernel/manual-config.nix b/pkgs/os-specific/linux/kernel/manual-config.nix
index acc593035591..6d9baed7f2dd 100644
--- a/pkgs/os-specific/linux/kernel/manual-config.nix
+++ b/pkgs/os-specific/linux/kernel/manual-config.nix
@@ -105,7 +105,6 @@ let
       '';
 
       buildFlags = [
-        "KBUILD_BUILD_TIMESTAMP=1" # (time_t)1
         "KBUILD_BUILD_VERSION=1-NixOS"
         platform.kernelTarget
       ] ++ optional isModular "modules";