Makefile done, main to test, ft_strlen done

Makefile

@@ -0,0 +1,38 @@
+CC 	:= gcc
+AS	:= nasm
+ASFLAGS := -g -Wall
+CFLAGS  := -g -Wall -Wextra -Wno-override-init -std=c2x 
+MAIN	:= $(wildcard *.c)
+SRC	:= $(wildcard src/*.s)
+OBJ_DIR := build
+OBJ_CC  := $(addprefix $(OBJ_DIR)/, $(patsubst %.c,%.o, $(MAIN)))
+OBJ_AS  := $(addprefix $(OBJ_DIR)/, $(patsubst %.s,%.o, $(SRC)))
+DIR 	:= .
+NAME    := main
+LIB_NAME:= asm
+
+LD  	:= $(CC)
+LDFLAGS := -L$(OBJ_DIR) -l$(LIB_NAME)
+
+
+all: $(NAME)
+
+$(NAME): $(OBJ_CC) $(OBJ_AS)
+	ar rcs $(OBJ_DIR)/lib$(LIB_NAME).a $(OBJ_AS)
+	$(LD) $(OBJ_CC) $(LDFLAGS) -o $(DIR)/$(NAME)
+
+$(OBJ_DIR)/%.o: %.c
+	@mkdir -p $(@D)
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+$(OBJ_DIR)/%.o: %.s
+	@mkdir -p $(@D)
+	$(AS) $(ASFLAGS) -f elf64 $< -o $@
+
+clean:
+	@rm -f $(NAME)
+	@rm -rf $(OBJ_DIR)
+
+re:
+	@make --no-print clean
+	@make --no-print all

main.c

@@ -0,0 +1,7 @@
+#include "main.h"
+
+int main(void) {
+	size_t size = ft_strlen("test\n");
+	printf("size: %ld\n", size);
+	return 0;
+}

main.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <string.h>
+#include <stdio.h>
+
+extern size_t ft_strlen(const char *s);

src/ft_strlen.s

@@ -0,0 +1,29 @@
+bits 64
+
+%define STDOUT 1
+%define SYS_WRITE 1
+%define SYS_EXIT 60
+
+section .text
+	global ft_strlen
+	ft_strlen:
+
+		; empilement
+		push rbp
+
+		; code
+		mov rbx, rdi
+		mov rsi, -1
+
+		loop:
+			inc rsi
+			mov al, [rbx + rsi]
+			cmp al, 0
+			jne loop
+
+		; rétablissement
+		pop rbp
+
+		; return
+		mov rax, rsi
+		ret