cmake/toolchains/litertlm_android.toolchain.cmake

# ==============================================================================
# LiteRT-LM Android Toolchain Wrapper
# ==============================================================================

list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES
    ANDROID_NDK_ROOT
    ANDROID_ABI
    ANDROID_PLATFORM
    ANDROID_STL
    CMAKE_SYSTEM_NAME
    CMAKE_SYSTEM_VERSION
    CMAKE_ANDROID_ARCH_ABI
    CMAKE_ANDROID_NDK
    CMAKE_ANDROID_STL_TYPE
)

if(NOT DEFINED ANDROID_ABI)
    set(ANDROID_ABI "arm64-v8a" CACHE STRING "Target Android Architecture")
    if(NOT CMAKE_C_COMPILER_LOADED)
        message(STATUS "[LiteRTLM] No ANDROID_ABI provided. Defaulting to ${ANDROID_ABI}.")
    endif()
endif()

if(NOT DEFINED ANDROID_PLATFORM)
    set(ANDROID_PLATFORM "android-28" CACHE STRING "Target Android API Level")
    if(NOT CMAKE_C_COMPILER_LOADED)
        message(STATUS "[LiteRTLM] No ANDROID_PLATFORM provided. Defaulting to ${ANDROID_PLATFORM}.")
    endif()
endif()

if(NOT DEFINED ANDROID_STL)
    set(ANDROID_STL "c++_shared" CACHE STRING "Target Android STL")
endif()

if(NOT DEFINED CMAKE_SYSTEM_NAME)
    set(CMAKE_SYSTEM_NAME "Android" CACHE STRING "Target OS")
endif()

if(NOT DEFINED CMAKE_ANDROID_ARCH_ABI)
    set(CMAKE_ANDROID_ARCH_ABI "${ANDROID_ABI}" CACHE STRING "Target Android Architecture (Native)")
endif()

if(NOT DEFINED CMAKE_SYSTEM_VERSION)
    string(REPLACE "android-" "" _API_LEVEL "${ANDROID_PLATFORM}")
    set(CMAKE_SYSTEM_VERSION "${_API_LEVEL}" CACHE STRING "Target Android API Level (Native)")
endif()

if(NOT DEFINED CMAKE_ANDROID_STL_TYPE)
    set(CMAKE_ANDROID_STL_TYPE "${ANDROID_STL}" CACHE STRING "Target Android STL (Native)")
endif()

if(NOT DEFINED CMAKE_ANDROID_NDK)
    set(CMAKE_ANDROID_NDK "${_LITERTLM_NDK_ROOT}" CACHE PATH "Path to the Android NDK (Native)")
endif()

set(_REAL_NDK_TOOLCHAIN "${ANDROID_NDK_ROOT}/build/cmake/android.toolchain.cmake")

if(NOT EXISTS "${_REAL_NDK_TOOLCHAIN}")
    message(FATAL_ERROR "[LiteRTLM] Could not find the Android NDK toolchain at: ${_REAL_NDK_TOOLCHAIN}")
endif()

list(APPEND LITERTLM_TOOLCHAIN_ARGS
    # Legacy Google Variables
    "-DANDROID_ABI=${ANDROID_ABI}"
    "-DANDROID_PLATFORM=${ANDROID_PLATFORM}"
    "-DANDROID_STL=${ANDROID_STL}"
    "-DANDROID_NDK_ROOT=${ANDROID_NDK_ROOT}"

    # Native CMake Variables (The Bridge for Corrosion/Rust)
    "-DCMAKE_SYSTEM_NAME=${CMAKE_SYSTEM_NAME}"
    "-DCMAKE_SYSTEM_VERSION=${CMAKE_SYSTEM_VERSION}"
    "-DCMAKE_ANDROID_ARCH_ABI=${CMAKE_ANDROID_ARCH_ABI}"
    "-DCMAKE_ANDROID_STL_TYPE=${CMAKE_ANDROID_STL_TYPE}"
    "-DCMAKE_ANDROID_NDK=${CMAKE_ANDROID_NDK}"
)

include("${_REAL_NDK_TOOLCHAIN}")