Compile deltachat-rpc-server for Android

Co-Authored-By: link2xt <link2xt@testrun.org>

.github/workflows/deltachat-rpc-server.yml

@@ -51,6 +51,50 @@ jobs:
           path: target/aarch64-unknown-linux-musl/release/deltachat-rpc-server
           if-no-files-found: error
 
+  build_android:
+    name: Cross-compile deltachat-rpc-server for Android (armeabi-v7a, arm64-v8a, x86 and x86_64)
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: nttld/setup-ndk@v1
+        id: setup-ndk
+        with:
+          ndk-version: r21d
+
+      - name: Build
+        env:
+          ANDROID_NDK_ROOT: ${{ steps.setup-ndk.outputs.ndk-path }}
+        run: sh scripts/android-rpc-server.sh
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: deltachat-rpc-server-android-armv7
+          path: target/armv7-linux-androideabi/release/deltachat-rpc-server
+          if-no-files-found: error
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: deltachat-rpc-server-android-aarch64
+          path: target/aarch64-linux-android/release/deltachat-rpc-server
+          if-no-files-found: error
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: deltachat-rpc-server-android-i686
+          path: target/i686-linux-android/release/deltachat-rpc-server
+          if-no-files-found: error
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: deltachat-rpc-server-android-x86_64
+          path: target/x86_64-linux-android/release/deltachat-rpc-server
+          if-no-files-found: error
+
   build_windows:
     name: Build deltachat-rpc-server for Windows
     strategy:

scripts/android-rpc-server.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+# Build deltachat-rpc-server for Android.
+
+set -e
+
+test -n "$ANDROID_NDK_ROOT" || exit 1
+
+RUSTUP_TOOLCHAIN="1.64.0"
+rustup install "$RUSTUP_TOOLCHAIN"
+rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android --toolchain "$RUSTUP_TOOLCHAIN"
+
+KERNEL="$(uname -s | tr '[:upper:]' '[:lower:]')"
+ARCH="$(uname -m)"
+NDK_HOST_TAG="$KERNEL-$ARCH"
+TOOLCHAIN="$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/$NDK_HOST_TAG"
+export PATH="$PATH:$TOOLCHAIN/bin/"
+
+PACKAGE="deltachat-rpc-server"
+
+export CARGO_PROFILE_RELEASE_LTO=on
+
+CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_LINKER="$TOOLCHAIN/bin/armv7a-linux-androideabi16-clang" \
+	CFLAGS=-D__ANDROID_API__=16 \
+	TARGET_CC=armv7a-linux-androideabi16-clang \
+	TARGET_AR=llvm-ar \
+	cargo "+$RUSTUP_TOOLCHAIN" rustc --release --target armv7-linux-androideabi -p $PACKAGE
+
+CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER="$TOOLCHAIN/bin/aarch64-linux-android21-clang" \
+	CFLAGS=-D__ANDROID_API__=21 \
+	TARGET_CC=aarch64-linux-android21-clang \
+	TARGET_AR=llvm-ar \
+	cargo "+$RUSTUP_TOOLCHAIN" rustc --release --target aarch64-linux-android -p $PACKAGE
+
+CARGO_TARGET_I686_LINUX_ANDROID_LINKER="$TOOLCHAIN/bin/i686-linux-android16-clang" \
+	CFLAGS=-D__ANDROID_API__=16 \
+	TARGET_CC=i686-linux-android16-clang \
+	TARGET_AR=llvm-ar \
+	cargo "+$RUSTUP_TOOLCHAIN" rustc --release --target i686-linux-android -p $PACKAGE
+
+CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER="$TOOLCHAIN/bin/x86_64-linux-android21-clang" \
+	CFLAGS=-D__ANDROID_API__=21 \
+	TARGET_CC=x86_64-linux-android21-clang \
+	TARGET_AR=llvm-ar \
+	cargo "+$RUSTUP_TOOLCHAIN" rustc --release --target x86_64-linux-android -p $PACKAGE