我在项目中需要Makefile的帮助

Question

I'm trying to make a Makefile but I'm having some problems

first I have

2 source files: ~/main.c ~/lib/library.c 1 header file: ~/include/library.h

main.c and library.c both share the same header file library.h

# Compiler options
CC = gcc
INC = -I../include
CFLAGS = -Wall -g -c $(INC)
LIB = -L../lib
LFLAGS = -Wall -g $(LIB)

# Dependencies
LIBS = -libmylib
OBJS = main.o
SRCS = $(OBJS:.o=.c)
EXEC = a.out

# Other rules
RM = rm -rf
TAGS = tags
BAK = Makefile.bak

all: $(EXEC)
    @echo ------------------------ Compile Complete ----------------------------

.PHONY: clean depend

$(EXEC): $(OBJS)
    $(CC) $(LFLAGS) -o $@ $^ $(LIBS)

.c.o:
    $(CC) $(INC) -M $^
    $(CC) $(CFLAGS) -o $@ $<

clean:
    $(RM) *.o *~ $(EXEC) $(TAGS) $(BAK)

depend: $(SRCS)
    makedepend $(INC) $^

it keeps saying that I it can't make a rule out of library.o

plus I have another question

I acknowledge the fact that when Makefile comes in to action after calling 'make',

and subsequently go to the line .co or %c: %o(in GNU enhanced version) and make

.o files. but why doesn't it also call clean and depend automatically?

---

I've edited some things from the previous version of Makefile

this time, (well pretty similar to the previous problem) even though I

clarified the library path(-I../lib),

the Makefile cannot find the archive file (which I created as libmylib.a in ../lib dir)

now it's driving me crazy

Answer 1

but why doesn't it also call clean and depend automatically?

Because make only builds the target you tell it. If you don't specify one, the first target is built, which in many cases, such as yours, is the 'all' target.