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/build-support/rust/build-rust-crate/lib.sh

@@ -0,0 +1,174 @@
+echo_build_heading() {
+  if (( $# == 1 )); then
+    echo_colored "Building $1"
+  else
+    echo_colored "Building $1 ($2)"
+  fi
+}
+
+build_lib() {
+  lib_src=$1
+  echo_build_heading $lib_src ${libName}
+
+  noisily rustc \
+    --crate-name $CRATE_NAME \
+    $lib_src \
+    --out-dir target/lib \
+    -L dependency=target/deps \
+    --cap-lints allow \
+    $LIB_RUSTC_OPTS \
+    $BUILD_OUT_DIR \
+    $EXTRA_BUILD \
+    $EXTRA_FEATURES \
+    $EXTRA_RUSTC_FLAGS \
+    --color $colors
+
+  EXTRA_LIB=" --extern $CRATE_NAME=target/lib/lib$CRATE_NAME-$metadata.rlib"
+  if [ -e target/deps/lib$CRATE_NAME-$metadata$LIB_EXT ]; then
+     EXTRA_LIB="$EXTRA_LIB --extern $CRATE_NAME=target/lib/lib$CRATE_NAME-$metadata$LIB_EXT"
+  fi
+}
+
+build_bin() {
+  local crate_name=$1
+  local crate_name_=$(echo $crate_name | tr '-' '_')
+  local main_file=""
+
+  if [[ ! -z $2 ]]; then
+    main_file=$2
+  fi
+  echo_build_heading $@
+  noisily rustc \
+    --crate-name $crate_name_ \
+    $main_file \
+    --crate-type bin \
+    $BIN_RUSTC_OPTS \
+    --out-dir target/bin \
+    -L dependency=target/deps \
+    $LINK \
+    $EXTRA_LIB \
+    --cap-lints allow \
+    $BUILD_OUT_DIR \
+    $EXTRA_BUILD \
+    $EXTRA_FEATURES \
+    $EXTRA_RUSTC_FLAGS \
+    --color ${colors} \
+
+  if [ "$crate_name_" != "$crate_name" ]; then
+    mv target/bin/$crate_name_ target/bin/$crate_name
+  fi
+}
+
+build_lib_test() {
+    local file="$1"
+    EXTRA_RUSTC_FLAGS="--test $EXTRA_RUSTC_FLAGS" build_lib "$1" "$2"
+}
+
+build_bin_test() {
+    local crate="$1"
+    local file="$2"
+    EXTRA_RUSTC_FLAGS="--test $EXTRA_RUSTC_FLAGS" build_bin "$1" "$2"
+}
+
+build_bin_test_file() {
+    local file="$1"
+    local derived_crate_name="${file//\//_}"
+    derived_crate_name="${derived_crate_name%.rs}"
+    build_bin_test "$derived_crate_name" "$file"
+}
+
+# Add additional link options that were provided by the build script.
+setup_link_paths() {
+  EXTRA_LIB=""
+  if [[ -e target/link_ ]]; then
+    EXTRA_BUILD="$(cat target/link_) $EXTRA_BUILD"
+  fi
+
+  echo "$EXTRA_LINK_SEARCH" | while read i; do
+     if [[ ! -z "$i" ]]; then
+       for library in $i; do
+         echo "-L $library" >> target/link
+         L=$(echo $library | sed -e "s#$(pwd)/target/build#$lib/lib#")
+         echo "-L $L" >> target/link.final
+       done
+     fi
+  done
+  echo "$EXTRA_LINK" | while read i; do
+     if [[ ! -z "$i" ]]; then
+       for library in $i; do
+         echo "-l $library" >> target/link
+         echo "-l $library" >> target/link.final
+       done
+     fi
+  done
+
+  if [[ -e target/link ]]; then
+     tr '\n' ' ' < target/link > target/link_
+     LINK=$(cat target/link_)
+  fi
+}
+
+search_for_bin_path() {
+  # heuristic to "guess" the correct source file as found in cargo:
+  # https://github.com/rust-lang/cargo/blob/90fc9f620190d5fa3c80b0c8c65a1e1361e6b8ae/src/cargo/util/toml/targets.rs#L308-L325
+
+  BIN_NAME=$1
+  BIN_NAME_=$(echo $BIN_NAME | tr '-' '_')
+
+  # the first two cases are the "new" default IIRC
+  FILES=( "src/bin/$BIN_NAME.rs" "src/bin/$BIN_NAME/main.rs" "src/bin/$BIN_NAME_.rs" "src/bin/$BIN_NAME_/main.rs" "src/bin/main.rs" "src/main.rs" )
+
+  if ! [ -e "$LIB_PATH" -o -e src/lib.rs -o -e "src/$LIB_NAME.rs" ]; then
+    # if this is not a library the following path is also valid
+    FILES=( "src/$BIN_NAME.rs" "src/$BIN_NAME_.rs" "${FILES[@]}" )
+  fi
+
+  for file in "${FILES[@]}";
+  do
+    echo "checking file $file"
+    # first file that exists wins
+    if [[ -e "$file" ]]; then
+            BIN_PATH="$file"
+            break
+    fi
+  done
+
+  if [[ -z "$BIN_PATH" ]]; then
+    echo_error "ERROR: failed to find file for binary target: $BIN_NAME" >&2
+    exit 1
+  fi
+}
+
+# Extracts cargo_toml_path of the matching crate.
+matching_cargo_toml_path() {
+  local manifest_path="$1"
+  local expected_crate_name="$2"
+
+  # If the Cargo.toml is not a workspace root,
+  # it will only contain one package in ".packages"
+  # because "--no-deps" suppressed dependency resolution.
+  #
+  # But to make it more general, we search for a matching
+  # crate in all packages and use the manifest path that
+  # is referenced there.
+  cargo metadata --no-deps --format-version 1 \
+    --manifest-path "$manifest_path" \
+    | jq -r '.packages[]
+            | select( .name == "'$expected_crate_name'")
+            | .manifest_path'
+}
+
+# Find a Cargo.toml in the current or any sub directory
+# with a matching crate name.
+matching_cargo_toml_dir() {
+  local expected_crate_name="$1"
+
+  find -L -name Cargo.toml | sort | while read manifest_path; do
+    echo "...checking manifest_path $manifest_path" >&2
+    local matching_path="$(matching_cargo_toml_path "$manifest_path" "$expected_crate_name")"
+    if [ -n "${matching_path}" ]; then
+      echo "$(dirname $matching_path)"
+      break
+    fi
+  done
+}