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cmake_minimum_required(VERSION 3.21)
project(kernel C ASM)
set(SRC
boot/gdt/gdt.cc
boot/gdt/gdt.s
boot/init/boot.s
drivers/serial.cc
drivers/vga_text_buffer.cc
kernel/halt.cc
kernel/io.cc
kernel/kernel.cc
kernel/spinlock.cc
kernel/stack_smashing_protector.cc
libk/printf.cc
libk/printk.cc
libk/strlen.cc
libk/kmalloc.cc
mm/memory_map.cc
mm/physical_mm/bitmap.cc
mm/physical_mm/physical_mm.cc
mm/virtual_mm/virtual_mm.cc
mm/virtual_mm/pages.cc
)
add_executable(kernel ${SRC})
target_include_directories(kernel PRIVATE include)
set(C_COMPILE_OPTIONS
-ffreestanding
-fstack-protector
-fstack-protector-all
# -O3
-Wall
-Wextra
-pedantic
# -Werror
# TODO: This doesn't actually work right now because of the linker script :')
-g
)
set(CXX_COMPILE_OPTIONS
-fno-exceptions
-fno-rtti
-std=c++98
-Wno-write-strings
-Wno-missing-field-initializers
)
target_compile_options(kernel PRIVATE
$<$<COMPILE_LANGUAGE:C>: ${C_COMPILE_OPTIONS}>
$<$<COMPILE_LANGUAGE:CXX>: ${C_COMPILE_OPTIONS} ${CXX_COMPILE_OPTIONS}>
)
set(LINKER_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/boot/linker.ld")
set(LINKER_FLAGS
-T ${LINKER_SCRIPT}
-nostdlib
)
execute_process(COMMAND ${CMAKE_CXX_COMPILER}
-print-file-name=crtbegin.o
OUTPUT_VARIABLE CRTBEGIN_O
OUTPUT_STRIP_TRAILING_WHITESPACE
)
execute_process(COMMAND ${CMAKE_CXX_COMPILER}
-print-file-name=crtend.o
OUTPUT_VARIABLE CRTEND_O
OUTPUT_STRIP_TRAILING_WHITESPACE
)
add_library(crti OBJECT boot/init/crti.s)
add_library(crtn OBJECT boot/init/crtn.s)
add_dependencies(kernel crti crtn)
get_target_property(CRTI_SRC crti SOURCES)
get_target_property(CRTN_SRC crtn SOURCES)
get_target_property(CRTI_OUT crti BINARY_DIR)
get_target_property(CRTN_OUT crtn BINARY_DIR)
set(CRTI_O "${CRTI_OUT}/CMakeFiles/crti.dir/${CRTI_SRC}.o")
set(CRTN_O "${CRTN_OUT}/CMakeFiles/crtn.dir/${CRTN_SRC}.o")
# FIXME: This isn't a good way of setting the link order.
set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_COMPILER} <CMAKE_CXX_LINK_FLAGS> <FLAGS> <LINK_FLAGS> \
${CRTI_O} \
${CRTBEGIN_O} \
<OBJECTS> \
${CRTEND_O} \
${CRTN_O} \
-o <TARGET> <LINK_LIBRARIES>"
)
target_link_options(kernel PRIVATE ${LINKER_FLAGS})
target_link_libraries(kernel PRIVATE gcc)
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