set(CROSS_NDK_TOOLCHAIN $ENV{ROOTFS_DIR}/..)
set(CROSS_ROOTFS ${CROSS_NDK_TOOLCHAIN}/sysroot)
set(CLR_CMAKE_PLATFORM_ANDROID "Android")

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_PROCESSOR arm)

## Specify the toolchain
set(TOOLCHAIN "arm-linux-androideabi")
set(CMAKE_PREFIX_PATH ${CROSS_NDK_TOOLCHAIN})

find_program(CMAKE_C_COMPILER ${TOOLCHAIN}-clang)
find_program(CMAKE_CXX_COMPILER ${TOOLCHAIN}-clang++)
find_program(CMAKE_ASM_COMPILER ${TOOLCHAIN}-clang)
find_program(CMAKE_OBJCOPY ${TOOLCHAIN}-objcopy)
find_program(CMAKE_OBJDUMP ${TOOLCHAIN}-objdump)

add_compile_options(--sysroot=${CROSS_ROOTFS})
add_compile_options(-fPIE)

# Some libraries, like libcurl, check for the __ANDROID__ flag to include some required headers.
add_compile_options(-D__ANDROID__)

set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} -B ${CROSS_ROOTFS}/usr/lib/gcc/${TOOLCHAIN}")
set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} -L${CROSS_ROOTFS}/lib/${TOOLCHAIN}")
set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} --sysroot=\"${CROSS_ROOTFS}\"")
set(CROSS_LINK_FLAGS "${CROSS_LINK_FLAGS} -fPIE -pie")

set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    ${CROSS_LINK_FLAGS}" CACHE STRING "" FORCE)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CROSS_LINK_FLAGS}" CACHE STRING "" FORCE)
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${CROSS_LINK_FLAGS}" CACHE STRING "" FORCE)

set(CMAKE_FIND_ROOT_PATH "${CROSS_ROOTFS}")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)