pico-sdk/cmake/preload/toolchains/pico_arm_gcc.cmake

# todo there is probably a more "cmake" way of doing this going thru the standard path with our "PICO" platform
#  i.e. CMake<Lang>Information and whatnot
include(${CMAKE_CURRENT_LIST_DIR}/find_compiler.cmake)

# include our Platform/PICO.cmake
set(CMAKE_SYSTEM_NAME PICO)
set(CMAKE_SYSTEM_PROCESSOR cortex-m0plus)

if (NOT PICO_GCC_TRIPLE)
    if (DEFINED ENV{PICO_GCC_TRIPLE})
        set(PICO_GCC_TRIPLE $ENV{PICO_GCC_TRIPLE})
        message("PICO_GCC_TRIPLE set from environment: $ENV{PICO_GCC_TRIPLE}")
    else()
        set(PICO_GCC_TRIPLE arm-none-eabi)
        pico_message_debug("PICO_GCC_TRIPLE defaulted to arm-none-eabi")
    endif()
endif()

# Find GCC for ARM.
pico_find_compiler(PICO_COMPILER_CC ${PICO_GCC_TRIPLE}-gcc)
pico_find_compiler(PICO_COMPILER_CXX ${PICO_GCC_TRIPLE}-g++)
set(PICO_COMPILER_ASM "${PICO_COMPILER_CC}" CACHE INTERNAL "")
pico_find_compiler(PICO_OBJCOPY ${PICO_GCC_TRIPLE}-objcopy)
pico_find_compiler(PICO_OBJDUMP ${PICO_GCC_TRIPLE}-objdump)

# Specify the cross compiler.
set(CMAKE_C_COMPILER ${PICO_COMPILER_CC} CACHE FILEPATH "C compiler")
set(CMAKE_CXX_COMPILER ${PICO_COMPILER_CXX} CACHE FILEPATH "C++ compiler")
set(CMAKE_C_OUTPUT_EXTENSION .o)

# todo should we be including CMakeASMInformation anyway - i guess that is host side
set(CMAKE_ASM_COMPILER ${PICO_COMPILER_ASM} CACHE FILEPATH "ASM compiler")
set(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>   -c <SOURCE>")
set(CMAKE_INCLUDE_FLAG_ASM "-I")
set(CMAKE_OBJCOPY ${PICO_OBJCOPY} CACHE FILEPATH "")
set(CMAKE_OBJDUMP ${PICO_OBJDUMP} CACHE FILEPATH "")

# Disable compiler checks.
set(CMAKE_C_COMPILER_FORCED TRUE)
set(CMAKE_CXX_COMPILER_FORCED TRUE)

# Add target system root to cmake find path.
get_filename_component(PICO_COMPILER_DIR "${PICO_COMPILER_CC}" DIRECTORY)
get_filename_component(CMAKE_FIND_ROOT_PATH "${PICO_COMPILER_DIR}" DIRECTORY)

# Look for includes and libraries only in the target system prefix.
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

option(PICO_DEOPTIMIZED_DEBUG "Build debug builds with -O0" 0)

# todo move to platform/Generix-xxx

# on ARM -mcpu should not be mixed with -march
set(ARM_GCC_COMMON_FLAGS " -mcpu=cortex-m0plus -mthumb")
foreach(LANG IN ITEMS C CXX ASM)
    set(CMAKE_${LANG}_FLAGS_INIT "${ARM_GCC_COMMON_FLAGS}")
    if (PICO_DEOPTIMIZED_DEBUG)
        set(CMAKE_${LANG}_FLAGS_DEBUG_INIT "-O0")
    else()
        set(CMAKE_${LANG}_FLAGS_DEBUG_INIT "-Og")
    endif()
    set(CMAKE_${LANG}_LINK_FLAGS "-Wl,--build-id=none")
endforeach()