# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

if(NOT ARM_TARGET_OS STREQUAL "android")
    return()
endif()

set(ANDROID TRUE)
add_definitions(-DLITE_WITH_LINUX)
add_definitions(-DLITE_WITH_ANDROID)

if(NOT DEFINED ANDROID_NDK)
    set(ANDROID_NDK $ENV{NDK_ROOT})
    if(NOT ANDROID_NDK)
        message(FATAL_ERROR "Must set ANDROID_NDK or env NDK_ROOT")
    endif()
endif()

if(ARM_TARGET_LANG STREQUAL "gcc")
    # gcc do not need set lang on android
    set(ARM_TARGET_LANG "")
endif()

if(NOT DEFINED ANDROID_API_LEVEL)
    set(ANDROID_API_LEVEL "23")
    if(ARM_TARGET_ARCH_ABI STREQUAL "armv7")
        if(LITE_WITH_NPU AND NOT LITE_ON_TINY_PUBLISH)
            set(ANDROID_API_LEVEL "21") # HIAI DDK depends on android-24
        else()
            set(ANDROID_API_LEVEL "21")
        endif()
    endif()
endif()

# then check input arm abi
if(ARM_TARGET_ARCH_ABI STREQUAL "armv7hf")
    message(FATAL_ERROR "ANDROID does not support hardfp on v7 use armv7 instead.")
endif()

set(ANDROID_ARCH_ABI ${ARM_TARGET_ARCH_ABI} CACHE STRING "Choose Android Arch ABI")
if(ARM_TARGET_ARCH_ABI STREQUAL "armv8")
    set(ANDROID_ARCH_ABI "arm64-v8a")
endif()

if(ARM_TARGET_ARCH_ABI STREQUAL "armv7")
    set(ANDROID_ARCH_ABI "armeabi-v7a")
endif()

check_input_var(ANDROID_ARCH_ABI DEFAULT ${ANDROID_ARCH_ABI} LIST "arm64-v8a" "armeabi-v7a"
    "armeabi-v6" "armeabi" "mips" "mips64" "x86" "x86_64")
check_input_var(ANDROID_STL_TYPE DEFAULT "c++_static" LIST "c++_static" "gnustl_static" "c++_shared")

if(ANDROID_ARCH_ABI STREQUAL "armeabi-v7a")
    message(STATUS "armeabi-v7a use softfp by default.")
    set(CMAKE_ANDROID_ARM_NEON ON)
    message(STATUS "NEON is enabled on arm-v7a with softfp.")
endif()

set(CMAKE_SYSTEM_NAME Android)
set(CMAKE_SYSTEM_VERSION ${ANDROID_API_LEVEL})
set(CMAKE_ANDROID_ARCH_ABI ${ANDROID_ARCH_ABI})
set(CMAKE_ANDROID_NDK ${ANDROID_NDK})
set(CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION ${ARM_TARGET_LANG})
set(CMAKE_ANDROID_STL_TYPE ${ANDROID_STL_TYPE})

if (ARM_TARGET_LANG STREQUAL "clang")
    if(ARM_TARGET_ARCH_ABI STREQUAL "armv8")
        set(triple aarch64-v8a-linux-android)
    elseif(ARM_TARGET_ARCH_ABI STREQUAL "armv7")
        set(triple arm-v7a-linux-android)
        set(LITE_WITH_OPENMP OFF CACHE STRING "Due to libomp's bug(For ARM64, it has been fixed by https://reviews.llvm.org/D19879, but still exists on ARM32), disable OpenMP on armv7 when cross-compiling using Clang" FORCE)
        if(ANDROID_STL_TYPE MATCHES "^c\\+\\+_")
            # Use CMAKE_CXX_STANDARD_LIBRARIES_INIT to ensure libunwind and libc++ is linked in the right order
            set(CMAKE_CXX_STANDARD_LIBRARIES_INIT "${CMAKE_CXX_STANDARD_LIBRARIES_INIT} ${ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libs/${ANDROID_ARCH_ABI}/libunwind.a")
            if (ANDROID_API_LEVEL LESS 21)
                set(CMAKE_CXX_STANDARD_LIBRARIES_INIT "${CMAKE_CXX_STANDARD_LIBRARIES_INIT} ${ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libs/${ANDROID_ARCH_ABI}/libandroid_support.a")
            endif()
            if(ANDROID_STL_TYPE STREQUAL "c++_shared")
                set(CMAKE_CXX_STANDARD_LIBRARIES_INIT "${CMAKE_CXX_STANDARD_LIBRARIES_INIT} ${ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libs/${ANDROID_ARCH_ABI}/libc++_shared.so")
            elseif(ANDROID_STL_TYPE STREQUAL "c++_static")
                set(CMAKE_CXX_STANDARD_LIBRARIES_INIT "${CMAKE_CXX_STANDARD_LIBRARIES_INIT} ${ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libs/${ANDROID_ARCH_ABI}/libc++_static.a")
                set(CMAKE_CXX_STANDARD_LIBRARIES_INIT "${CMAKE_CXX_STANDARD_LIBRARIES_INIT} ${ANDROID_NDK}/sources/cxx-stl/llvm-libc++/libs/${ANDROID_ARCH_ABI}/libc++abi.a")
            else()
                message(FATAL_ERROR "Invalid Android STL TYPE: ${ANDROID_STL_TYPE}.")
            endif()
        endif()
    else()
        message(FATAL_ERROR "Clang do not support this ${ARM_TARGET_ARCH_ABI}, use armv8 or armv7")
    endif()

    set(CMAKE_C_COMPILER clang)
    set(CMAKE_C_COMPILER_TARGET ${triple})
    set(CMAKE_CXX_COMPILER clang++)
    set(CMAKE_CXX_COMPILER_TARGET ${triple})

    message(STATUS "CMAKE_CXX_COMPILER_TARGET: ${CMAKE_CXX_COMPILER_TARGET}")
endif()