TARGET ?= sh4-unknown-linux-gnu-
AS=$(TARGET)as
LD=$(TARGET)ld
CC=$(TARGET)gcc
OBJCOPY=$(TARGET)objcopy
ENDIAN ?= little
ifeq ($(ENDIAN),little)
AS_ENDIAN = --little
LD_ENDIAN = -EL
CC_ENDIAN = -ml
OBJ_ENDIAN = -O elf32-sh-linux
else
AS_ENDIAN = --big
LD_ENDIAN = -EB
CC_ENDIAN = -mb
OBJ_ENDIAN = -O elf32-sh
endif

OPT = -Og

DEBUG = -g -gdwarf-4
AARCH = --isa=sh4
CARCH = -m4-single-only
OBJARCH = -B sh4
CFLAGS += -Wall -Werror -Wfatal-errors
CFLAGS += -falign-functions=4 -ffunction-sections -fdata-sections -fshort-enums
CFLAGS += -ffreestanding -nostdlib
DEPFLAGS = -MMD -MP
LDFLAGS += --no-warn-execstack

ALL_ELF =
all:

%.o: %.c
	$(CC) $(CARCH) $(CC_ENDIAN) $(CFLAGS) $(OPT) $(DEBUG) $(DEPFLAGS) -MF ${<}.d -c $< -o $@

%.o: %.s
	$(AS) $(AARCH) $(AS_ENDIAN) $(DEBUG) $< -o $@

define DEFAULT_LINK
	$(LD) $(LD_ENDIAN) $(LDFLAGS) \
		--section-start=.text=0x0 \
		--entry=_start $^ -o $@
endef

define BUILD_BINARY_O
	$(OBJCOPY) \
		-I binary $(OBJARCH) $(OBJ_ENDIAN) \
		$< $@
endef

%.txt.o: %.txt
	$(BUILD_BINARY_O)

%.elf: %.o
	$(DEFAULT_LINK)

%.bin: %.elf
	$(OBJCOPY) -O binary --remove-section=.stack $< $@

clean:
	find -P \
		-regextype posix-egrep \
		-regex '.*\.(o|bin|elf|d)$$' \
		-exec rm {} \;

.SUFFIXES:
.INTERMEDIATE:
.SECONDARY:
.PHONY: all clean

%: RCS/%,v
%: RCS/%
%: %,v
%: s.%
%: SCCS/s.%

MAKEFLAGS += --no-builtin-rules

include 2019/deps.mk
include 2020/deps.mk

all: $(subst .elf,.bin,$(ALL_ELF))