CC = gcc -g
CFLAGS = -Og -Wall -Wstrict-prototypes
AS = as -g
ASFLAGS = 
CPPFLAGS = -Iinclude
LDLIBS = -Llibcsapp -lcsapp
SED = sed

# Recognize operating system
ifeq ($(shell uname -s), Darwin)
CPPFLAGS += -DMACOS
SED = gsed
endif

ifeq ($(shell uname -s), Linux)
CPPFLAGS += -DLINUX
endif

ifeq ($(shell uname -s), FreeBSD)
CPPFLAGS += -DFREEBSD
endif

# Pass "VERBOSE=1" at command line to display command being invoked by GNU Make
ifneq ($(VERBOSE), 1)
.SILENT:
endif

LIBSRC_C = $(wildcard libcsapp/*.c)
LIBSRC_S = $(wildcard libcsapp/*.s)
LIBSRC_H = $(wildcard include/*.h)
LIBSRCS = $(LIBSRC_C) $(LIBSRC_S) $(LIBSRC_H)
LIBOBJS = $(LIBSRC_C:%.c=%.o)
ifneq ($(shell uname -s), Darwin)
LIBOBJS += $(LIBSRC_S:%.s=%.o)
endif
LIB = libcsapp/libcsapp.a

SRC_C = $(wildcard *.c)
SRC_S = $(wildcard *.s)
SRC_H = $(wildcard *.h)
SRCS = $(SRC_C) $(SRC_S)
OBJS = $(SRC_C:%.c=%.o) 

SOURCES = $(SRCS) $(LIBSRCS)
OBJECTS = $(OBJS) $(LIBOBJS)
DEPFILES = $(foreach f,$(SRC_C) $(LIBSRC_C),\
	     $(dir $(f))$(patsubst %.c,.%.d,$(notdir $(f))))

ARCHIVE = so$(shell date +'%y')_$(shell basename $(PWD))
FILES = Makefile Makefile.include $(EXTRA-FILES)

all: $(DEPFILES) $(LIB) $(PROGS)

$(LIB): $(LIBOBJS)

# Generate dependencies automatically
ifeq ($(words $(findstring $(MAKECMDGOALS), archive clean)), 0)
  -include $(DEPFILES)
endif

# Disable all built-in recipes and define our own
.SUFFIXES:

.%.d: %.c
	$(CC) $(CPPFLAGS) -MM -MG -o $@ $<

%.o: %.c .%.d
	@echo "[CC] $@ <- $<"
	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<

%.o: %.s
	@echo "[AS] $@ <- $<"
	$(AS) $(ASFLAGS) -c -o $@ $<

%.a:
	@echo "[AR] $@ <- $^"
	$(AR) rc $@ $^

%: %.o $(LIB)
	@echo "[LD] $@ <- $^"
	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)

clean:
	rm -vf $(PROGS) $(OBJECTS) $(DEPFILES) $(LIB)
	rm -vf $(shell find -L . -iname '*~')
	rm -vf $(ARCHIVE).tar.gz
	rm -vrf $(EXTRA-CLEAN) *.dSYM

format:
	clang-format --style=file -i $(LIBSRC_C) $(LIBSRC_H) $(SRC_C) $(SRC_H)

archive: clean
	mkdir -p $(ARCHIVE) $(ARCHIVE)/libcsapp $(ARCHIVE)/include
	cp -L $(SRCS) $(SRC_H) $(FILES) $(ARCHIVE)/
	cp -L $(LIBSRCS) $(ARCHIVE)/libcsapp/
	cp -L $(LIBSRC_H) $(ARCHIVE)/include/
	for f in $(SRCS:%=$(ARCHIVE)/%); do \
	  $(SED) --in-place='' -e '/^#if.*STUDENT/,/^#endif.*STUDENT/d' $$f; \
	done
	tar cvzhf $(ARCHIVE).tar.gz $(ARCHIVE)
	rm -rf $(ARCHIVE)

.PHONY: all clean format archive 

# vim: ts=8 sw=8 noet