mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Debug ..
cd ..
make -C build

# directly
qemu-system-i386 -kernel kernel.bin

# via Grub:
# https://wiki.osdev.org/GRUB_2#Installing_GRUB_2_on_OS_X
# brew install xorriso
./mkiso.sh kernel.bin
qemu-system-i386 -cdrom os.iso

# support exit
-device isa-debug-exit,iobase=0xf4,iosize=0x04

# remote gdb (port 1234):
-s

# stdio serial:
-serial stdio

# IDE drive:
-drive file=hd.img,if=ide,format=raw

# HAXM (macOS)
-enable-hax

# KVM (Linux)
-enable-kvm

# -----------------
# Full example:
make -C build && ./mkiso.sh build/kernel.bin && ./mkhd.sh build && \
qemu-system-i386 -cdrom os.iso -serial stdio \
-device isa-debug-exit,iobase=0xf4,iosize=0x04 \
-drive file=hd.img,if=ide,format=raw -boot d