ARCH=riscv64-unknown-elf
GNU_DIR=$(HOME)/riscv/riscv/
GNU_BIN=$(GNU_DIR)/bin


CC=$(GNU_BIN)/$(ARCH)-gcc
CXX=$(GNU_BIN)/$(ARCH)-g++
AS=$(GNU_BIN)/$(ARCH)-as
LD=$(GNU_BIN)/$(ARCH)-ld
OBJCOPY=$(GNU_BIN)/$(ARCH)-objcopy
OBJDUMP=$(GNU_BIN)/$(ARCH)-objdump
SIZE=$(GNU_BIN)/$(ARCH)-size
AR=$(GNU_BIN)/$(ARCH)-ar
RANLIB=$(GNU_BIN)/$(ARCH)-ranlib


CFLAGS+=-ffreestanding 
CFLAGS+=-fno-pic
CFLAGS+=-march=rv32i -mabi=ilp32
CFLAGS+=  -g


LDFLAGS+=-nostdlib
LDFLAGS+=-Wl,-Ttext=0x00000000

# see: https://github.com/riscv/riscv-gcc/issues/120
#LDFLAGS+=-Wl,--no-relax



ASFLAGS+=$(CFLAGS)
CXXFLAGS+=$(CFLAGS)

CLEAN_DIRS=$(SUBDIRS:%=clean-%)
ALL_DIRS=$(SUBDIRS:%=all-%)

OBJDUMPFLAGS+=-Mnumeric,no-aliases

.PHONY: all clean world $(CLEAN_DIRS) $(ALL_DIRS)


%.bin : %
	$(OBJCOPY) $< -O binary $@

%.lst : %
	$(OBJDUMP) $(OBJDUMPFLAGS) -dr --disassemble-all $< > $<.lst

% : %.o
	$(LINK.cc) $(LDFLAGS) -o $@ $^ $(LDLIBS)
	$(SIZE) -x -A $@

%.s: %.c
	$(COMPILE.c) -S -o $@ $<

%.s: %.cc
	$(COMPILE.cc) -S -o $@ $<

%.o: %.c
	$(COMPILE.c) -o $@ $<

%.o: %.cc
	$(COMPILE.cc) -o $@ $<

%.srec: %
	$(OBJCOPY) $< -O srec $@ 




all:: $(ALL_DIRS)

clean:: $(CLEAN_DIRS)

$(ALL_DIRS)::
	$(MAKE) -C $(@:all-%=%) all

$(CLEAN_DIRS)::
	$(MAKE) -C $(@:clean-%=%) clean

world:: clean all