CMakeLists.txt

cmake_minimum_required(VERSION 3.13)
include($ENV{PICO_SDK_PATH}/external/pico_sdk_import.cmake)

project(swift-blinky)
pico_sdk_init()

if(APPLE)
execute_process(COMMAND xcrun -f swiftc OUTPUT_VARIABLE SWIFTC OUTPUT_STRIP_TRAILING_WHITESPACE)
else()
execute_process(COMMAND which swiftc OUTPUT_VARIABLE SWIFTC OUTPUT_STRIP_TRAILING_WHITESPACE)
endif()


set(SWIFT_TARGET "armv6m-none-none-eabi") # default for rp2040

if(PICO_PLATFORM STREQUAL "rp2350-arm-s")
    message(STATUS "PICO_PLATFORM is set to rp2350-arm-s, using armv7em")
    set(SWIFT_TARGET "armv7em-none-none-eabi")
elseif(PICO_PLATFORM STREQUAL "rp2350-riscv")
    # Untested, gives PICO-SDK errors when building
    message(WARNING "PICO_PLATFORM is set to rp2350-riscv, using riscv32 (untested). It is recommended to use rp2350-arm-s.")
    set(SWIFT_TARGET "riscv32-none-none-eabi")
endif()

add_executable(swift-blinky)
add_custom_command(
    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o
    COMMAND
        ${SWIFTC}
        -target ${SWIFT_TARGET} -Xcc -mfloat-abi=soft -Xcc -fshort-enums
        -Xfrontend -function-sections -enable-experimental-feature Embedded -wmo -parse-as-library
        $$\( echo '$<TARGET_PROPERTY:swift-blinky,INCLUDE_DIRECTORIES>' | tr '\;' '\\n' | sed -e 's/\\\(.*\\\)/-Xcc -I\\1/g' \)
        $$\( echo '${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}'             | tr ' '  '\\n' | sed -e 's/\\\(.*\\\)/-Xcc -I\\1/g' \)
        -import-bridging-header ${CMAKE_CURRENT_LIST_DIR}/BridgingHeader.h
        ${CMAKE_CURRENT_LIST_DIR}/Main.swift
        -c -o ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o
    DEPENDS
        ${CMAKE_CURRENT_LIST_DIR}/BridgingHeader.h
        ${CMAKE_CURRENT_LIST_DIR}/Main.swift
)
add_custom_target(swift-blinky-swiftcode DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o)

target_link_libraries(swift-blinky
    pico_stdlib hardware_uart hardware_gpio
    ${CMAKE_CURRENT_BINARY_DIR}/_swiftcode.o
)
add_dependencies(swift-blinky swift-blinky-swiftcode)
pico_add_extra_outputs(swift-blinky)