kernel 4.14 require libelf to compile modules.

[...]
make modules -C /nix/store/h1vzl6bq4wif3m8dd1bw2p3fv4shjg3n-linux-4.14.9-dev/lib/modules/4.14.9/build EXTRA_CFLAGS=-Werror-implicit-function-declaration M=/tmp/nix-build-spl-kernel-2017-11-16-4.14.9.drv-0/source/build
/nix/store/h1vzl6bq4wif3m8dd1bw2p3fv4shjg3n-linux-4.14.9-dev/lib/modules/4.14.9/source/Makefile:939: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel". Stop.

This patch introduces kernel.moduleBuildDependencies to avoid the logic "stdenv.lib.optional (stdenv.lib.versionAtLeast kernel.version "4.14") libelf" in multiple places.

[dezgeg did some minor tweaks on top]

1 files changed, 4 insertions, 1 deletions

diff --git a/pkgs/os-specific/linux/kernel/manual-config.nix b/pkgs/os-specific/linux/kernel/manual-config.nix
index 355fbde6268..e1936495921 100644
--- a/pkgs/os-specific/linux/kernel/manual-config.nix
+++ b/pkgs/os-specific/linux/kernel/manual-config.nix
@@ -49,6 +49,9 @@ let
   inherit (stdenv.lib)
     hasAttr getAttr optional optionalString optionalAttrs maintainers platforms;
 
+  # Dependencies that are required to build kernel modules
+  moduleBuildDependencies = stdenv.lib.optional (stdenv.lib.versionAtLeast version "4.14") libelf;
+
   installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
     #!${stdenv.shell} -e
     mkdir -p $4
@@ -85,7 +88,7 @@ let
         (isModular || (config.isDisabled "FIRMWARE_IN_KERNEL"));
     in (optionalAttrs isModular { outputs = [ "out" "dev" ]; }) // {
       passthru = {
-        inherit version modDirVersion config kernelPatches configfile;
+        inherit version modDirVersion config kernelPatches configfile moduleBuildDependencies;
       };
 
       inherit src;