O = 1
CC = ${PSMLDIR}/psml-bochs/toolchain/install/bin/i586-elf-gcc

# 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 = sbrk.o read.o write.o isatty.o lseek.o close.o fstat.o _exit.o
LIBSYS = libsys.a

all: crt0.o ${LIBSYS}
.PHONY: all

crt0.o: crt0.s
	$(CC) $(CFLAGS) -c $<

${LIBSYS}: $(LIBSYSOBJS)
	ar -c -r $(LIBSYS) $(LIBSYSOBJS)

read.o: read.c
	$(CC) $(CFLAGS) $< -c

write.o: write.c
	$(CC) $(CFLAGS) $< -c

sbrk.o: sbrk.c $(LDS)
	$(CC) $(CFLAGS) $< -c

lseek.o: lseek.c
	$(CC) $(CFLAGS) $< -c

isatty.o: isatty.c
	$(CC) $(CFLAGS) $< -c

fstat.o: fstat.c
	$(CC) $(CFLAGS) $< -c

_exit.o: _exit.c
	$(CC) $(CFLAGS) $< -c

clean:
	-rm -rf *.o *.a *~