uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/tools/build-managers/gn/default.nix

@@ -0,0 +1,10 @@
+{ callPackage, ... } @ args:
+
+callPackage ./generic.nix args {
+  # Note: Please use the recommended version for Chromium, e.g.:
+  # https://git.archlinux.org/svntogit/packages.git/tree/trunk/chromium-gn-version.sh?h=packages/gn
+  rev = "fd3d768bcfd44a8d9639fe278581bd9851d0ce3a";
+  revNum = "1718"; # git describe HEAD --match initial-commit | cut -d- -f3
+  version = "2020-03-09";
+  sha256 = "1asc14y8by7qcn10vbk467hvx93s30pif8r0brissl0sihsaqazr";
+}

pkgs/development/tools/build-managers/gn/generic.nix

@@ -0,0 +1,60 @@
+{ stdenv, lib, fetchgit, darwin, writeText
+, ninja, python3
+, ...
+}:
+
+{ rev, revNum, version, sha256 }:
+
+let
+  revShort = builtins.substring 0 7 rev;
+  lastCommitPosition = writeText "last_commit_position.h" ''
+    #ifndef OUT_LAST_COMMIT_POSITION_H_
+    #define OUT_LAST_COMMIT_POSITION_H_
+
+    #define LAST_COMMIT_POSITION_NUM ${revNum}
+    #define LAST_COMMIT_POSITION "${revNum} (${revShort})"
+
+    #endif  // OUT_LAST_COMMIT_POSITION_H_
+  '';
+
+in stdenv.mkDerivation {
+  pname = "gn-unstable";
+  inherit version;
+
+  src = fetchgit {
+    # Note: The TAR-Archives (+archive/${rev}.tar.gz) are not deterministic!
+    url = "https://gn.googlesource.com/gn";
+    inherit rev sha256;
+  };
+
+  nativeBuildInputs = [ ninja python3 ];
+  buildInputs = lib.optionals stdenv.isDarwin (with darwin; with apple_sdk.frameworks; [
+    libobjc
+    cctools
+
+    # frameworks
+    ApplicationServices
+    Foundation
+    AppKit
+  ]);
+
+  buildPhase = ''
+    python build/gen.py --no-last-commit-position
+    ln -s ${lastCommitPosition} out/last_commit_position.h
+    ninja -j $NIX_BUILD_CORES -C out gn
+  '';
+
+  installPhase = ''
+    install -vD out/gn "$out/bin/gn"
+  '';
+
+  setupHook = ./setup-hook.sh;
+
+  meta = with lib; {
+    description = "A meta-build system that generates build files for Ninja";
+    homepage = "https://gn.googlesource.com/gn";
+    license = licenses.bsd3;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ stesie matthewbauer primeos ];
+  };
+}

pkgs/development/tools/build-managers/gn/rev1924.nix

@@ -0,0 +1,8 @@
+{ callPackage, ... } @ args:
+
+callPackage ./generic.nix args {
+  rev = "24e2f7df92641de0351a96096fb2c490b2436bb8";
+  revNum = "1924"; # git describe HEAD --match initial-commit | cut -d- -f3
+  version = "2021-08-08";
+  sha256 = "1lwkyhfhw0zd7daqz466n7x5cddf0danr799h4jg3s0yvd4galjl";
+}

pkgs/development/tools/build-managers/gn/setup-hook.sh

@@ -0,0 +1,14 @@
+gnConfigurePhase() {
+    runHook preConfigure
+
+    echo "gn flags: $gnFlags ${gnFlagsArray[@]}"
+
+    gn gen out/Release --args="$gnFlags ${gnFlagsArray[@]}"
+    cd out/Release/
+
+    runHook postConfigure
+}
+
+if [ -z "${dontUseGnConfigure-}" -a -z "${configurePhase-}" ]; then
+    configurePhase=gnConfigurePhase
+fi