set(CMAKE_SYSTEM_PROCESSOR aarch64)
set(CMAKE_C_COMPILER   aarch64-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)

set(SYSROOT /opt/aarch64-sysroot)
set(CMAKE_SYSROOT ${SYSROOT})
set(CMAKE_FIND_ROOT_PATH ${SYSROOT})

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)

set(CMAKE_CROSSCOMPILING TRUE)

set(CUSTOM_FLAGS
  -mlow-precision-recip-sqrt
  -mlow-precision-sqrt
  -mlow-precision-div
)

string(JOIN " " CUSTOM_FLAGS_STR ${CUSTOM_FLAGS})
set(CMAKE_C_FLAGS_INIT   "${CMAKE_C_FLAGS} ${CUSTOM_FLAGS_STR}")
set(CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS} ${CUSTOM_FLAGS_STR}")