set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_PROCESSOR ARM)

set(CMAKE_C_COMPILER arm-none-eabi-gcc)
set(CMAKE_CXX_COMPILER arm-none-eabi-g++)
set(CMAKE_ASM_COMPILER arm-none-eabi-gcc)

set(CMAKE_OBJCOPY arm-none-eabi-objcopy CACHE INTERNAL "objcopy tool")
set(CMAKE_SIZE_UTIL arm-none-eabi-size CACHE INTERNAL "size tool")

set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)

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(shared_options "-Wall -Wextra -Os -mlittle-endian -mthumb -mcpu=cortex-m4 -mthumb-interwork -mfloat-abi=hard -mfpu=fpv4-sp-d16")
set(CMAKE_C_FLAGS_INIT "${shared_options}" CACHE INTERNAL "Initial options for C compiler.")
set(CMAKE_CXX_FLAGS_INIT "${shared_options}" CACHE INTERNAL "Initial options for C++ compiler.")
set(CMAKE_EXE_LINKER_FLAGS_INIT "-Wl,--gc-sections,--print-memory-usage,-Map=${PROJECT_BINARY_DIR}/${PROJECT_NAME}.map" CACHE INTERNAL "Initial options for executable linker.")
# set(CMAKE_EXE_LINKER_FLAGS_INIT "${CMAKE_EXE_LINKER_FLAGS_INIT}, -T ${CMAKE_SOURCE_DIR}/lib/src/stm32f439zi_flash.ld")