Build: native llama.cpp via CMake, legacy jniLibs packaging for proot

app/build.gradle.kts

@@ -8,6 +8,7 @@ plugins {
 android {
     namespace = "io.github.abrarul.modularai"
     compileSdk = 34
+    ndkVersion = "27.0.12077973"
 
     defaultConfig {
         applicationId = "io.github.abrarul.modularai"
@@ -16,6 +17,16 @@ android {
         versionCode = 1
         versionName = "0.1.0"
         ndk { abiFilters += listOf("arm64-v8a") }
+        externalNativeBuild {
+            cmake {
+                arguments += listOf("-DANDROID_STL=c++_static", "-DCMAKE_BUILD_TYPE=Release")
+                cppFlags += listOf("-O3")
+            }
+        }
+    }
+
+    externalNativeBuild {
+        cmake { path = file("src/main/cpp/CMakeLists.txt") }
     }
 
     buildTypes {
@@ -34,7 +45,11 @@ android {
         compose = true
         buildConfig = true
     }
-    packaging { resources.excludes += "/META-INF/{AL2.0,LGPL2.1}" }
+    packaging {
+        resources.excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        // proot must exist as real files in nativeLibraryDir to be executable on Android 10+
+        jniLibs.useLegacyPackaging = true
+    }
 }
 
 dependencies {
@@ -44,6 +59,7 @@ dependencies {
     implementation("androidx.compose.material3:material3")
     implementation("androidx.compose.ui:ui")
     implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.6")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.6")
     implementation("androidx.biometric:biometric:1.1.0")
     implementation("androidx.room:room-runtime:2.6.1")
     implementation("androidx.room:room-ktx:2.6.1")