CC       ?= gcc
AR       ?= ar
RANLIB   ?= ranlib
CFLAGS   ?= -Os -fno-builtin -ffreestanding -nostdinc
LDFLAGS  ?= -nostdlib -static

-include config.mak
ARCH     ?= x86_64

CFLAGS   += -I. -I include

SRC_DIRS  = src/string src/stdio src/stdlib src/internal
OBJ_DIR   = obj
LIB_DIR   = lib

SRCS := $(shell find $(SRC_DIRS) -name '*.c' 2>/dev/null)
OBJS := $(SRCS:%=$(OBJ_DIR)/%.o)
CRT_OBJ := crt/crt1.o

.PHONY: all clean distclean

all: $(LIB_DIR)/libc.a $(CRT_OBJ)

$(OBJ_DIR)/%.c.o: %.c
	@mkdir -p $(dir $@)
	$(CC) $(CFLAGS) -c -o $@ $<

$(LIB_DIR)/libc.a: $(OBJS)
	@mkdir -p $(LIB_DIR)
	$(AR) crs $@ $^
	$(RANLIB) $@

crt/crt1.o: crt/crt1.c
	$(CC) $(CFLAGS) -c -o $@ $<

clean:
	rm -rf $(OBJ_DIR) $(LIB_DIR)

distclean: clean
	rm -f config.mak