ifneq ($(shell which riscv64-unknown-elf-objdump 2> /dev/null),)
TOOLPREFIX := riscv64-unknown-elf-
else
ifneq ($(shell which riscv64-linxu-gnu-objdump 2> /dev/null),)
TOOLPREFIX := riscv64-linux-gnu-
else
$(error "Couldn't find an riscv64 version of GCC/binutils")
endif
endif

CC      := $(TOOLPREFIX)gcc
LD      := $(TOOLPREFIX)ld
CFLAGS  := -ffreestanding -fno-PIE -g -mcmodel=medany
LDFLAGS := -Ttext=0x80000000 --no-relax

KERNEL  := hello.out

all: $(KERNEL)

$(KERNEL): start.o main.o
	$(LD) $(LDFLAGS) -o $@ $^

clean:
	-rm -f *.o $(KERNEL)

qemu: $(KERNEL)
	qemu-system-riscv64 -machine virt -nographic -bios none -kernel $<