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/compilers/mrustc/bootstrap.nix

@@ -0,0 +1,153 @@
+{ lib, stdenv
+, fetchurl
+, mrustc
+, mrustc-minicargo
+, rust
+, llvm_7
+, llvmPackages_7
+, libffi
+, cmake
+, python3
+, zlib
+, libxml2
+, openssl
+, pkg-config
+, curl
+, which
+, time
+}:
+
+let
+  rustcVersion = "1.29.0";
+  rustcSrc = fetchurl {
+    url = "https://static.rust-lang.org/dist/rustc-${rustcVersion}-src.tar.gz";
+    sha256 = "1sb15znckj8pc8q3g7cq03pijnida6cg64yqmgiayxkzskzk9sx4";
+  };
+  rustcDir = "rustc-${rustcVersion}-src";
+in
+
+stdenv.mkDerivation rec {
+  pname = "mrustc-bootstrap";
+  version = "${mrustc.version}_${rustcVersion}";
+
+  inherit (mrustc) src;
+  postUnpack = "tar -xf ${rustcSrc} -C source/";
+
+  # the rust build system complains that nix alters the checksums
+  dontFixLibtool = true;
+
+  patches = [
+    ./patches/0001-use-shared-llvm.patch
+    ./patches/0002-dont-build-llvm.patch
+    ./patches/0003-echo-newlines.patch
+    ./patches/0004-increase-parallelism.patch
+  ];
+
+  postPatch = ''
+    echo "applying patch ./rustc-${rustcVersion}-src.patch"
+    patch -p0 -d ${rustcDir}/ < rustc-${rustcVersion}-src.patch
+
+    for p in ${lib.concatStringsSep " " llvmPackages_7.compiler-rt.patches}; do
+      echo "applying patch $p"
+      patch -p1 -d ${rustcDir}/src/libcompiler_builtins/compiler-rt < $p
+    done
+  '';
+
+  # rustc unfortunately needs cmake to compile llvm-rt but doesn't
+  # use it for the normal build. This disables cmake in Nix.
+  dontUseCmakeConfigure = true;
+
+  strictDeps = true;
+  nativeBuildInputs = [
+    cmake
+    mrustc
+    mrustc-minicargo
+    pkg-config
+    python3
+    time
+    which
+  ];
+  buildInputs = [
+    # for rustc
+    llvm_7 libffi zlib libxml2
+    # for cargo
+    openssl curl
+  ];
+
+  makeFlags = [
+    # Use shared mrustc/minicargo/llvm instead of rebuilding them
+    "MRUSTC=${mrustc}/bin/mrustc"
+    "MINICARGO=${mrustc-minicargo}/bin/minicargo"
+    "LLVM_CONFIG=${llvm_7.dev}/bin/llvm-config"
+    "RUSTC_TARGET=${rust.toRustTarget stdenv.targetPlatform}"
+  ];
+
+  buildPhase = ''
+    runHook preBuild
+
+    local flagsArray=(
+      PARLEVEL=$NIX_BUILD_CORES
+      ${toString makeFlags}
+    )
+
+    echo minicargo.mk: libs
+    make -f minicargo.mk "''${flagsArray[@]}" LIBS
+
+    echo minicargo.mk: deps
+    mkdir -p output/cargo-build
+    # minicargo has concurrency issues when running these; let's build them
+    # without parallelism
+    for crate in regex regex-0.2.11 curl-sys
+    do
+      echo "building $crate"
+      minicargo ${rustcDir}/src/vendor/$crate \
+        --vendor-dir ${rustcDir}/src/vendor \
+        --output-dir output/cargo-build -L output/
+    done
+
+    echo minicargo.mk: rustc
+    make -f minicargo.mk "''${flagsArray[@]}" output/rustc
+
+    echo minicargo.mk: cargo
+    make -f minicargo.mk "''${flagsArray[@]}" output/cargo
+
+    echo run_rustc
+    make -C run_rustc "''${flagsArray[@]}"
+
+    unset flagsArray
+
+    runHook postBuild
+  '';
+
+  doCheck = true;
+  checkPhase = ''
+    runHook preCheck
+    run_rustc/output/prefix/bin/hello_world | grep "hello, world"
+    runHook postCheck
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out/bin/ $out/lib/
+    cp run_rustc/output/prefix/bin/cargo $out/bin/cargo
+    cp run_rustc/output/prefix/bin/rustc_binary $out/bin/rustc
+
+    cp -r run_rustc/output/prefix/lib/* $out/lib/
+    cp $out/lib/rustlib/${rust.toRustTarget stdenv.targetPlatform}/lib/*.so $out/lib/
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    inherit (src.meta) homepage;
+    description = "A minimal build of Rust";
+    longDescription = ''
+      A minimal build of Rust, built from source using mrustc.
+      This is useful for bootstrapping the main Rust compiler without
+      an initial binary toolchain download.
+    '';
+    maintainers = with maintainers; [ progval r-burns ];
+    license = with licenses; [ mit asl20 ];
+    platforms = [ "x86_64-linux" ];
+  };
+}
+