cmake_minimum_required(VERSION 2.6) # or other version
project (foo C)

add_definitions(-funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -flto -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -c -std=gnu99)

add_definitions(-mmcu=atmega88)
list(APPEND MY_LINKER_FLAGS "-mmcu=atmega88 -flto")

add_executable(foo foo.c)

add_definitions(-O0)
 
set_target_properties(foo PROPERTIES SUFFIX ".elf")