Makefile

override NASM 		:= nasm
override CC			:= gcc
override LD			:= i686-elf-ld

CFLAGS				:= -I ../src/
CFLAGS				+= -ffreestanding
CFLAGS				+= -m32
CFLAGS				+= -fno-stack-protector
CFLAGS				+= -fno-PIE 

CFLAGS				+= -g


LDFLAGS				+= -m32
LDFLAGS				+= -fno-PIE
LDFLAGS				+= -g
LDFLAGS				+= -nostartfiles
LDFLAGS				+= -nostdlib

S_SRC				:= $(shell find . -type f -name '*.asm')
C_SRC				:= $(shell find . -type f -name '*.c')
LIBGCC 				:= $(shell $(CC) $(CFLAGS) --print-libgcc-file-name)

OBJ					:= $(S_SRC:.asm=.o) $(C_SRC:.c=.o)

all: kernel.bin

kernel.bin: $(OBJ)
	$(CC) -T ../link.ld $(LDFLAGS) -o $@ $^ $(LIBGCC)

%.o: %.c
	$(CC) $(CFLAGS)  -c $^ -o $@

%.o: %.asm
	$(NASM) -felf32 $^ -o $@


run: kernel.bin
	qemu-system-x86_64 -m 128M -kernel $< 

.PHONY: run all clean

gcc -T ../link.ld -m32 -fno-PIE -o kernel.bin idt/idt_.o gdt/gdt_.o kernel/boot.o video/video.o memory/memory.o idt/isr.o idt/idt.o gdt/gdt.o string/string.o kernel/kernel.o shell/shell.o keyboard/keyboard.o
/usr/bin/ld: gdt/gdt_.o: warning: relocation in read-only section .text' /usr/bin/ld: /usr/lib/gcc/x86_64-pc-linux-gnu/11.2.0/../../../../lib32/Scrt1.o: in function _start':
(.text+0x22): undefined reference to `main'
/usr/bin/ld: warning: creating DT_TEXTREL in a PIE
collect2: error: ld returned 1 exit status
make: *** [Makefile:23: kernel.bin] Error 1