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nixos/device-tree: preprocess overlays before compiling

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Run the device tree overlays through the preprocessor before compiling it, as
is done in the kernel. This helps make overlays easier to understand, and
improves compatibility with those found in the wild.

I found the correct command line by running the kernel build with V=1, and then
removing all the arguments related to dependency tracking.
This commit is contained in:
Ben Wolsieffer 2022-06-17 21:44:01 -04:00
parent 8e4b3323d1
commit 754005bf48
1 changed files with 3 additions and 2 deletions
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5
nixos/modules/hardware/device-tree.nix
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@ -85,13 +85,14 @@ let
# Compile single Device Tree overlay source
# file (.dts) into its compiled variant (.dtbo)
compileDTS = name: f: pkgs.callPackage({ dtc }: pkgs.stdenv.mkDerivation {
compileDTS = name: f: pkgs.callPackage({ stdenv, dtc }: stdenv.mkDerivation {
name = "${name}-dtbo";
nativeBuildInputs = [ dtc ];
buildCommand = ''
dtc -I dts ${f} -O dtb -@ -o $out
$CC -E -nostdinc -I${getDev cfg.kernelPackage}/lib/modules/${cfg.kernelPackage.modDirVersion}/source/scripts/dtc/include-prefixes -undef -D__DTS__ -x assembler-with-cpp ${f} | \
dtc -I dts -O dtb -@ -o $out
'';
}) {};