O = 1
CC = ${PSMLDIR}/psml-bochs/toolchain/install/bin/i586-elf-gcc
OBJCOPY = objcopy
LIBDIR = ../newlibsys
LDS = ${LIBDIR}/512K.lds

# set optimization level
CFLAGS := -O${O}
# i386-gcc pass -g so we do too ;-)
CFLAGS := -g
# set lang standard to c99
CFLAGS += -std=c99
# turn on all warnings
CFLAGS += -Wall
# force 32 bit code and address generation
CFLAGS += -m32 
# strip extraneous info from binary explicity ensure no comment section is 
# generated
CFLAGS += -s
# ensure no startup files are included
CFLAGS += -nostartfiles 
# avoid generating exception frame (.eh_frame) support
CFLAGS += -fno-asynchronous-unwind-tables
# use a freestanding environment eg no standard libs no start (may want to remove this)
CFLAGS += -ffreestanding 
# ensure that we only statically link things
CFLAGS += --static
# use custom vm linker script
CFLAGS += -T ${LDS} 
# remove identity generation from the binary
CFLAGS += -Wl,--build-id=none

CFLAGS += -Wl,-M

LIBSYSOBJS = ${LIBDIR}/sbrk.o ${LIBDIR}/read.o ${LIBDIR}/write.o ${LIBDIR}/isatty.o ${LIBDIR}/lseek.o ${LIBDIR}/close.o ${LIBDIR}/fstat.o ${LIBDIR}/_exit.o

all: protected_bios.bin ${EXPTYPE}.bin
.PHONY: all

protected_bios.bin: protected_bios.s
	as86 -2 -b $@ $< -l > protected_bios.lst

${EXPTYPE}.bin: ${EXPTYPE}.elf
	$(OBJCOPY) -S $< --output-target=binary $@

${EXPTYPE}.elf: ${EXPTYPE}.o ${LIBDIR}/crt0.o $(LIBSYSOBJS) $(LDS)
	$(CC) ${CFLAGS} -o $@ ${LIBDIR}/crt0.o $< $(LIBSYSOBJS) > ${EXPTYPE}.map

${EXPTYPE}.o: ${EXPTYPE}.c
	$(CC) $(CFLAGS) ${CDEFINES} -c $<


${LIBSYSOBJS}:
	$(MAKE) -C ${LIBDIR} libsys.a

${LIBDIR}/crt0.o:
	$(MAKE) -C ${LIBDIR} crt0.o


clean:
	-rm -rf *.o *.map *.elf *.bin *~