build.sh

#!/bin/bash
set -e

echo "--- Starting REAL OS Build Process ---"

# Cleanup
echo "Cleaning old build files..."
rm -rf isodir myos.bin myos.iso *.o

# Autodetect compiler
if command -v i686-elf-gcc &> /dev/null; then
    CC="i686-elf-gcc"
    AS="i686-elf-as"
else
    echo "Warning: i686-elf-gcc not found, attempting host gcc with -m32"
    CC="gcc -m32"
    AS="as --32"
fi

# 1. Assemble boot.s
echo "[1/4] Assembling boot.s..."
$AS boot.s -o boot.o

# 2. Compile Kernel
echo "[2/4] Compiling kernel.c..."
$CC -c kernel.c -o kernel.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra

# 3. Link objects
echo "[3/4] Linking objects into kernel binary..."
$CC -T linker.ld -o myos.bin -ffreestanding -O2 -nostdlib boot.o kernel.o -lgcc

# 4. Create ISO
echo "[4/4] Packaging ISO..."
mkdir -p isodir/boot/grub
cp myos.bin isodir/boot/myos.bin
cat > isodir/boot/grub/grub.cfg << EOF
menuentry "OS-Studio MyOS" {
	multiboot /boot/myos.bin
}
EOF

if command -v grub-mkrescue &> /dev/null; then
    grub-mkrescue -o myos.iso isodir
    echo "--- Build Finished Successfully! Created myos.iso ---"
else
    echo "Warning: grub-mkrescue not found (install mtools and xorriso). Continuing without ISO."
    echo "--- Build Finished Successfully! Created myos.bin ---"
fi