From e89082346762164f5a9f7f3ebc3afa13fb964718 Mon Sep 17 00:00:00 2001
From: adisbladis <adisbladis@gmail.com>
Date: Thu, 23 Jul 2020 21:34:55 +0200
Subject: [PATCH] emacs: Add native builds for nativeComp enabled emacsen

---
 pkgs/build-support/emacs/generic.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkgs/build-support/emacs/generic.nix b/pkgs/build-support/emacs/generic.nix
index 6fa27f0983927..956787ad59e4e 100644
--- a/pkgs/build-support/emacs/generic.nix
+++ b/pkgs/build-support/emacs/generic.nix
@@ -56,6 +56,16 @@ stdenv.mkDerivation ({
   meta = defaultMeta // meta;
 }
 
+// lib.optionalAttrs (emacs.nativeComp or false) {
+
+  LIBRARY_PATH = "${lib.getLib stdenv.cc.libc}/lib";
+
+  postInstall = ''
+    find $out/share/emacs -type f -name '*.el' -print0 | xargs -0 -n 1 -I {} -P $NIX_BUILD_CORES sh -c "emacs --batch -f batch-native-compile {} || true"
+  '';
+
+}
+
 // removeAttrs args [ "buildInputs" "packageRequires"
                       "meta"
                     ])