cmake_minimum_required(VERSION 3.15)
project(new_kernel C ASM)
set(CMAKE_C_STANDARD 99)

# Define compiler run time
SET(COMPILER_RT ${CMAKE_CURRENT_LIST_DIR}/compiler/target/bin)
SET(CMAKE_C_COMPILER ${COMPILER_RT}/i686-elf-gcc)
SET(CMAKE_ASM_COMPILER ${COMPILER_RT}/i686-elf-gcc)

# Optionally enable cmake debugging
#SET(CMAKE_VERBOSE_MAKEFILE ON)

# Set compile flags
SET(CMAKE_C_FLAGS "-g -ffreestanding -Wall -Wextra -fno-exceptions -fstack-protector -fno-pie -m32")
SET(CMAKE_ASM_FLAGS "${CFLAGS} -m32 -x assembler-with-cpp")
SET(CMAKE_EXE_LINKER_FLAGS "-T${CMAKE_CURRENT_LIST_DIR}/linker.ld -nostdlib -lgcc")

# Include directory
include_directories(AFTER include)

################
#   Features   #
################

set(ENABLE_ACPI ON CACHE BOOL "Enable ACPI Suppport")

####################
#   ACPI Feature   #
####################
if (ENABLE_ACPI)
    include_directories(AFTER lai/include)
    FILE(GLOB lai lai/core/*.c lai/helpers/*.c lai/driver/*.c)
ELSE()
    set(lai)
endif ()

# Other sourcees
FILE(GLOB_RECURSE kernel_src kernel/**.c)
FILE(GLOB_RECURSE kernel_asm kernel/**.S)
FILE(GLOB_RECURSE boot_asm boot/boot.S)

add_compile_definitions(__kernel__)

#######################
#   Kernel Features   #
#######################

# ACPI
if (ENABLE_ACPI)
    add_compile_definitions(ENABLE_ACPI)
endif ()

# Run IDE in DMA mode if available (NYI)
#add_compile_definitions(IDE_ENABLE_INTERRUPT)
# Kernel Command Line features
add_compile_definitions(ENABLE_K_SHELL) # Run the kernel shell as the main task
add_compile_definitions(ENABLE_SELF_TEST)  # Compile in self test kernel CLI command
add_compile_definitions(ENABLE_PCIPP)  # Support for pretty printing pci class/subclass/interface

# find libgcc.a
add_library(libgcc STATIC IMPORTED)
set_target_properties(libgcc PROPERTIES IMPORTED_LOCATION ${COMPILER_RT}/../lib/gcc/i686-elf/10.2.0/libgcc.a)

add_executable(my-kernel.bin ${kernel_src} ${kernel_asm} ${boot_asm} ${lai})
target_link_libraries(my-kernel.bin libgcc)
set_source_files_properties(${kernel_src} PROPERTIES LANGUAGE C COMPILE_FLAGS "")
set_target_properties(my-kernel.bin PROPERTIES LINKER_LANGUAGE C PREFIX "" SUFFIX "" LINK_FLAGS "")