OUTPREFIX     ?= $(abspath .)/
ROOTDIR       := $(abspath $(shell git rev-parse --show-toplevel))
SHODANROOTDIR := $(abspath $(ROOTDIR)/../..)
SRCDIR        := $(abspath .)
BUILDDIR      := $(OUTPREFIX)build

CFLAGS   += -std=gnu11

CCFLAGS  += -std=gnu++11
CCFLAGS  += -fno-exceptions

CXXFLAGS += -Wall
CXXFLAGS += -Werror
CXXFLAGS += -march=rv32imfv
CXXFLAGS += -I${ROOTDIR}/springbok/include
CXXFLAGS += -O3 -g3 -ggdb
CXXFLAGS += -fomit-frame-pointer
CXXFLAGS += -ffreestanding
CXXFLAGS += -fstack-usage
CXXFLAGS += -mstrict-align

LDFLAGS  += -nostartfiles
LDFLAGS  += -specs=nano.specs
LDFLAGS  += -Wl,--gc-sections
LDFLAGS  += -Wl,--print-memory-usage
LDFLAGS  += -Wl,-Map=${BUILDDIR}/hello_vec.map
LDFLAGS  += -T${ROOTDIR}/springbok/matcha.ld

CC       := ${SHODANROOTDIR}/cache/toolchain_vp/bin/riscv32-unknown-elf-gcc
CPP      := ${SHODANROOTDIR}/cache/toolchain_vp/bin/riscv32-unknown-elf-g++

${BUILDDIR}/hello_vec.elf: ${BUILDDIR}/main.o ${BUILDDIR}/springbok_gloss.o ${BUILDDIR}/crt0.o
	mkdir -p $(dir $@)
	${CPP} ${CXXFLAGS} ${CPPFLAGS} $^ ${LDFLAGS} -o $@
	@cat ${BUILDDIR}/hello_vec.map | awk '/\.heap/ {printf("%16s: %13s\n", "heap (reserved)", int(strtonum($$3)/1024) " KB")} /\.stack/ {printf("%16s: %13s\n", "stack (reserved)", int(strtonum($$3)/1024) " KB")}'

${BUILDDIR}/main.o: ${SRCDIR}/main.cpp ${MAKEFILE_LIST}
	mkdir -p $(dir $@)
	${CPP} ${CXXFLAGS} ${CPPFLAGS} -c $< -o $@

${BUILDDIR}/springbok_gloss.o: ${ROOTDIR}/springbok/springbok_gloss.cpp ${MAKEFILE_LIST}
	mkdir -p $(dir $@)
	${CPP} ${CXXFLAGS} ${CPPFLAGS} -c $< -o $@

${BUILDDIR}/crt0.o: ${ROOTDIR}/springbok/crt0.s ${MAKEFILE_LIST}
	mkdir -p $(dir $@)
	${CC} ${CXXFLAGS} ${CFLAGS} -c $< -o $@

.PHONY: clean
clean:
	rm -rf ${BUILDDIR}