cargoBuild failed with an exception

[SAGARSURI]

Hey @ncalexan I am getting the following error when I run .gradlew cargoBuild

> Task :app:cargoBuildArm FAILED
   Compiling adder v0.1.0 (/Users/surisa/Documents/flutter/flutter_rust_demo/native/adder)
error[E0463]: can't find crate for `std`
  |
  = note: the `armv7-linux-androideabi` target may not be installed
  = help: consider downloading the target with `rustup target add armv7-linux-androideabi`

error: requires `sized` lang_item

For more information about this error, try `rustc --explain E0463`.
error: could not compile `adder` due to 2 previous errors

My active toolchain:

❯ rustup show                              
Default host: aarch64-apple-darwin
rustup home:  /Users/surisa/.rustup

installed targets for active toolchain
--------------------------------------

aarch64-apple-darwin
aarch64-linux-android
armv7-linux-androideabi
i686-linux-android
x86_64-linux-android

active toolchain
----------------

stable-aarch64-apple-darwin (default)
rustc 1.64.0 (a55dd71d5 2022-09-19)

This is my build.gradle:

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion flutter.compileSdkVersion
    ndkVersion "25.1.8937393"

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.flutter_rust_demo"
        // You can update the following values to match your application needs.
        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
        minSdkVersion flutter.minSdkVersion
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

apply plugin: 'org.mozilla.rust-android-gradle.rust-android'

cargo {
    module  = "../../native/adder-ffi"       // Or whatever directory contains your Cargo.toml
    libname = "adder-ffi"          // Or whatever matches Cargo.toml's [package] name.
    targets = ["arm", "arm64", "x86", "x86_64"]  // See bellow for a longer list of options
    profile = "release"
    apiLevel = 21
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

[
        Debug: null,
        Profile: '--release',
        Release: '--release'
].each {
    def taskPostfix = it.key
    def profileMode = it.value
    tasks.whenTaskAdded { task ->
        if (task.name == "javaPreCompile$taskPostfix") {
            task.dependsOn 'cargoBuild'
        }
    }
}