Makefile-toAndroidTermuxFromPC

.PHONY: android-exe clean help

# Build Android shared library for all ABIs from macOS (or any PC).
# Usage:
#   make -f Makefile-toAndroidTermuxFromPC android ANDROID_SDK_ROOT=/path/to/Android/Sdk
# If not provided, it uses ANDROID_SDK_ROOT or ANDROID_HOME from env.

# --- Android SDK path handling ---
ANDROID_SDK_ROOT ?=
ANDROID_HOME ?=

SDK := $(strip $(firstword $(ANDROID_SDK_ROOT) $(ANDROID_HOME)))

# --- NDK selection: newest available in $(SDK)/ndk/* ---
NDK_DIR := $(shell if [ -n "$(SDK)" ] && [ -d "$(SDK)/ndk" ]; then ls -1d "$(SDK)/ndk/"* 2>/dev/null | sort -V | tail -n 1; fi)

# --- Project paths ---
ROOT_DIR := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
SRC_DIR := $(ROOT_DIR)/src
ANDROID_DIR := $(SRC_DIR)/android
PARENT_DIR := $(abspath $(ROOT_DIR)/..)
ORT_VERSION ?= 1.23.2
ONNXRUNTIME_ANDROID_DIR := $(PARENT_DIR)/onnxruntime-android/$(ORT_VERSION)

# --- Build output ---
BUILD_DIR := $(PARENT_DIR)/build-android

# --- Defaults ---
ABIS ?= arm64-v8a armeabi-v7a x86_64
MIN_SDK ?= 26

# NDK toolchain (macOS/Linux/Windows)
HOST_OS := $(shell uname -s 2>/dev/null)

ifeq ($(findstring Darwin,$(HOST_OS)),Darwin)
	NDK_HOST_TAGS := darwin-arm64 darwin-x86_64
else ifeq ($(findstring Linux,$(HOST_OS)),Linux)
	NDK_HOST_TAGS := linux-x86_64 linux-arm64
else
	NDK_HOST_TAGS := windows-x86_64 windows
endif

NDK_TOOLCHAIN := $(firstword $(foreach tag,$(NDK_HOST_TAGS),$(wildcard $(NDK_DIR)/toolchains/llvm/prebuilt/$(tag))))

# Common flags
CXXFLAGS_COMMON := -std=c++20 -Wall -Wextra -fPIC -O2 -DTERMUX=1

help:
	@echo "Targets:"
	@echo "  android-exe - build openwakeword executable for ABIs: $(ABIS)"
	@echo "  clean    - remove $(BUILD_DIR)"
	@echo
	@echo "Variables:"
	@echo "  ANDROID_SDK_ROOT=/path/to/Android/Sdk (or ANDROID_HOME env fallback)"
	@echo "  ABIS=\"arm64-v8a armeabi-v7a x86_64\""
	@echo "  MIN_SDK=26 (NDK API level used for clang target)"
	@echo "  ORT_VERSION=1.23.2 (onnxruntime-android/<ver>/... directory to link against)"
	@echo ""
	@echo "Output paths:"
	@echo "  $(BUILD_DIR)/<ABI>/openwakeword"

android-exe:
	@if [ -z "$(SDK)" ]; then \
		echo "[ERROR] Android SDK path not set."; \
		echo "        Pass ANDROID_SDK_ROOT=/path/to/Android/Sdk or set ANDROID_SDK_ROOT/ANDROID_HOME env."; \
		exit 2; \
	fi
	@if [ ! -d "$(SDK)" ]; then \
		echo "[ERROR] Android SDK not found at: $(SDK)"; \
		exit 2; \
	fi
	@if [ -z "$(NDK_DIR)" ]; then \
		echo "[ERROR] No NDK found in $(SDK)/ndk/."; \
		echo "        Install it via Android Studio SDK Manager (NDK (Side by side))."; \
		exit 2; \
	fi
	@if [ ! -d "$(NDK_TOOLCHAIN)" ]; then \
		echo "[ERROR] NDK toolchain not found (expected): $(NDK_TOOLCHAIN)"; \
		echo "        NDK prebuilt should be under: $(NDK_DIR)/toolchains/llvm/prebuilt/"; \
		exit 2; \
	fi
	@if [ ! -d "$(ONNXRUNTIME_ANDROID_DIR)" ]; then \
		echo "[ERROR] Missing $(ONNXRUNTIME_ANDROID_DIR)."; \
		echo "        Expected structure:"; \
		echo "          onnxruntime-android/$(ORT_VERSION)/jni/<ABI>/libonnxruntime.so"; \
		echo "          onnxruntime-android/$(ORT_VERSION)/headers"; \
		exit 2; \
	fi
	@mkdir -p "$(BUILD_DIR)"
	@echo "[LOG] Using SDK: $(SDK)"
	@echo "[LOG] Using NDK: $(NDK_DIR)"
	@echo "[LOG] ABIs: $(ABIS)"
	@for abi in $(ABIS); do \
		echo "[LOG] Building $$abi..."; \
		$(MAKE) -f $(lastword $(MAKEFILE_LIST)) _android_exe_one ABI=$$abi || exit $$?; \
	done
	@echo "[LOG] Done. Outputs in: $(BUILD_DIR)/<ABI>/openwakeword"

_android_exe_one:
	@if [ -z "$(ABI)" ]; then \
		echo "[ERROR] ABI is required"; \
		exit 2; \
	fi
	@mkdir -p "$(BUILD_DIR)/$(ABI)"
	@case "$(ABI)" in \
		arm64-v8a)  TARGET=aarch64-linux-android; ANDROID_API=$(MIN_SDK); ;; \
		armeabi-v7a) TARGET=armv7a-linux-androideabi; ANDROID_API=$(MIN_SDK); ;; \
		x86_64)     TARGET=x86_64-linux-android; ANDROID_API=$(MIN_SDK); ;; \
		*) echo "[ERROR] Unsupported ABI: $(ABI)"; exit 2;; \
	esac; \
	CXX="$(NDK_TOOLCHAIN)/bin/$$TARGET$$ANDROID_API-clang++"; \
	ONNX_JNI_DIR="$(ONNXRUNTIME_ANDROID_DIR)/jni/$(ABI)"; \
	ONNX_LIB="$$ONNX_JNI_DIR/libonnxruntime.so"; \
	if [ ! -f "$$ONNX_LIB" ]; then \
		echo "[ERROR] Missing ONNX Runtime for $(ABI): $$ONNX_LIB"; \
		exit 2; \
	fi; \
	"$$CXX" $(CXXFLAGS_COMMON) \
		-I"$(ONNXRUNTIME_ANDROID_DIR)/headers" \
		-I"$(SRC_DIR)" \
		"$(SRC_DIR)/main.cpp" \
		"$$ONNX_LIB" \
		-llog -landroid -laaudio \
		-o "$(BUILD_DIR)/$(ABI)/openwakeword"

clean:
	rm -rf "$(BUILD_DIR)"