ScriptCraft/jni.build.gradle

def cDir = new File(rootProject.projectDir.absolutePath, 'src/main/c')

class JNIPlatform {
    String name
    String[] cmakeArgs
    String libExtension

    JNIPlatform(String name, String libExtension, File rootDir) {
        this.name = name
        this.cmakeArgs = ["-DCMAKE_TOOLCHAIN_FILE=${rootDir.absolutePath}/cmake/${name}-toolchain.cmake"] as String[]
        this.libExtension = libExtension
    }
}

JNIPlatform[] jniPlatforms = [
        new JNIPlatform("linux-x86_64", ".so", rootDir),
        new JNIPlatform("linux-x86", ".so", rootDir),
        new JNIPlatform("linux-armhf", ".so", rootDir),
        new JNIPlatform("linux-arm64", ".so", rootDir),
        new JNIPlatform("windows-x86_64", ".dll", rootDir),
        new JNIPlatform("windows-x86", ".dll", rootDir)
]

task cleanJNI {}
task compileJNI {}

for (JNIPlatform platform : jniPlatforms) {
    def buildDir = new File(cDir, "build-${platform.name}")
    if (!buildDir.exists()) {
        buildDir.mkdir()
    }

    tasks.create(name: "cmake-${platform.name}", group: 'jni', type: Exec) {
        workingDir buildDir

        executable 'cmake'
        args platform.cmakeArgs + ['..']
    }

    tasks.create(name: "compileJNI-${platform.name}", group: 'jni', type: Exec) {
        workingDir buildDir

        executable 'make'

        dependsOn tasks.getByName("cmake-${platform.name}")
    }

    compileJNI.dependsOn tasks.getByName("compileJNI-${platform.name}")

    tasks.create(name: "cleanJNI-${platform.name}", group: 'jni', type: Delete) {
        delete buildDir.absolutePath
    }

    cleanJNI.dependsOn tasks.getByName("cleanJNI-${platform.name}")
}

clean.dependsOn cleanJNI
processResources.dependsOn compileJNI

processResources {
    for (JNIPlatform platform : jniPlatforms) {
        def buildDir = new File(cDir, "build-${platform.name}")
        if (!buildDir.exists()) {
            buildDir.mkdir()
        }

        def file = new File(buildDir, 'libscriptcraft' + platform.libExtension)
        inputs.files file

        from(file.absolutePath) {
            into new File('natives', platform.name).path
        }
    }
}