# See the end of this file for copyright and license terms.

cmake_minimum_required(VERSION 3.14.0)

include(options.cmake)
include(arch/${ARCH}/toolchain.cmake)

project(ardix VERSION 0.1.0 LANGUAGES C ASM)
set(CMAKE_C_STANDARD 17)
set(CMAKE_C_EXTENSIONS OFF)

if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
    set_property(GLOBAL PROPERTY USE_FOLDERS ON)
endif()

find_package(Git QUIET)
if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
	option(GIT_SUBMODULE "Update git submodules during build" ON)
	if(GIT_SUBMODULE)
		message(STATUS "Git submodule update")
		execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
				WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
				RESULT_VARIABLE GIT_SUBMOD_RESULT)
		if(NOT GIT_SUBMOD_RESULT EQUAL "0")
			message(FATAL_ERROR "git submodule update --init --recursive failed with ${GIT_SUBMOD_RESULT}, please checkout submodules")
		endif()
	endif()

	execute_process(
		COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
		WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
		OUTPUT_VARIABLE ardix_GIT_REVISION
		ERROR_QUIET
		OUTPUT_STRIP_TRAILING_WHITESPACE
	)
	if (NOT "${ardix_GIT_REVISION}" STREQUAL "")
		set(ardix_VERSION_SUFFIX "-${ardix_GIT_REVISION}")
	endif()
endif()

add_library(ardix INTERFACE)
set(ARDIX_INCLUDE_DIRS
	${CMAKE_CURRENT_SOURCE_DIR}/include
	${CMAKE_CURRENT_SOURCE_DIR}/arch/${ARCH}/include
	${CMAKE_CURRENT_BINARY_DIR}/include
)
set(ARDIX_COMPILE_OPTIONS
	-nodefaultlibs
	-nostartfiles
	-fno-builtin
	-Wall
	-Wno-sign-conversion
	-Wstrict-prototypes
	-Wredundant-decls
	-Wnested-externs
	-Wbad-function-cast
	-Wshadow
	-Wsign-compare
	-Wunreachable-code
	-Wwrite-strings
	-Wconversion
	-Waggregate-return
	-Winline
	-Wcast-align
)

configure_file(
	${CMAKE_SOURCE_DIR}/include/config.h.in
	${CMAKE_BINARY_DIR}/include/config.h
)

add_subdirectory(arch)

add_subdirectory(init)
add_subdirectory(kernel)
add_subdirectory(lib)

target_include_directories(ardix INTERFACE ${ARDIX_INCLUDE_DIRS})
target_compile_options(ardix INTERFACE ${ARDIX_COMPILE_OPTIONS})
target_link_options(ardix INTERFACE ${ARDIX_LINK_OPTIONS})
list(JOIN ARDIX_LINKER_FLAGS " " ARDIX_LINK_OPTIONS)

add_custom_target(ardix.elf DEPENDS ardix)
add_custom_command(
	TARGET ardix.elf
	COMMAND ${CMAKE_LINKER}
	ARGS ${ARDIX_LINKER_FLAGS} -o ardix.elf
		$<TARGET_FILE:ardix_arch>
		$<TARGET_FILE:ardix_init>
		$<TARGET_FILE:ardix_kernel>
		$<TARGET_FILE:ardix_kernel_fs>
		$<TARGET_FILE:ardix_lib>
)

add_custom_target(ardix.bin ALL DEPENDS ardix.elf)
add_custom_command(
	TARGET ardix.bin
	COMMAND ${CMAKE_OBJCOPY}
	ARGS -O binary -R .eeprom ardix.elf ardix.bin
)

# This file is part of Ardix.
# Copyright (c) 2021 Felix Kopp <owo@fef.moe>.
#
# Ardix is non-violent software: you may only use, redistribute,
# and/or modify it under the terms of the CNPLv6+ as found in
# the LICENSE file in the source code root directory or at
# <https://git.pixie.town/thufie/CNPL>.
#
# Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
# permitted by applicable law.  See the CNPLv6+ for details.