Prepare Toolchain file

CMake needs to be aware about toolchain we would like to use to finally compile the project with. This file will be universal across projects.

• Make new folder in project root: cmake
• Make new file in folder /cmake: ./cmake/gcc-arm-none-eabi.cmake

gcc-arm-none-eabi.cmake

set(CMAKE_SYSTEM_NAME               Generic)
set(CMAKE_SYSTEM_PROCESSOR          arm)

# Some default GCC settings
# arm-none-eabi- must be part of path environment
set(TOOLCHAIN_PREFIX                arm-none-eabi-)
set(FLAGS                           "-fdata-sections -ffunction-sections --specs=nano.specs -Wl,--gc-sections")
set(CPP_FLAGS                       "-fno-rtti -fno-exceptions -fno-threadsafe-statics")

# Define compiler settings
set(CMAKE_C_COMPILER                ${TOOLCHAIN_PREFIX}gcc ${FLAGS})
set(CMAKE_ASM_COMPILER              ${CMAKE_C_COMPILER})
set(CMAKE_CXX_COMPILER              ${TOOLCHAIN_PREFIX}g++ ${FLAGS} ${CPP_FLAGS})
set(CMAKE_OBJCOPY                   ${TOOLCHAIN_PREFIX}objcopy)
set(CMAKE_SIZE                      ${TOOLCHAIN_PREFIX}size)

set(CMAKE_EXECUTABLE_SUFFIX_ASM     ".elf")
set(CMAKE_EXECUTABLE_SUFFIX_C       ".elf")
set(CMAKE_EXECUTABLE_SUFFIX_CXX     ".elf")

set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)