Makefile Produces Errors but Builds Fine?

Question

I'm using a makefile to build several programs. Here's the code:

SRCS = prog1.c prog2.c prog3.c
TARG = all
CC = gcc
OPTS = -O
LIBS = -lm

OBJS = $(SRCS:.c=.o)

all: $(TARG)

$(TARG): $(OBJS)
    $(CC) -o $(TARG) $(OBJS) $(LIBS)

%.o: %.c
    $(CC) $(OPTS) -c $< -o $@

clean:
    rm -f $(OBJS) $(TARG)

This makefile perfectly generates three prog.o files, but I'm getting one error that is confusing me:

Makefile:12: recipe for target 'all' failed

I've done a fair amount of searching and can't find anything relating to my particular problem, so I was wondering if anyone had some insight into what is going on here. Thanks a bunch!

Answer 1

You have cyclic dependency of all depending on all (because TARG expands to all). The dependency graph must be a DAG. change

TARG = all

to

TARG = something

Answer 2

With TARG = all, you have:

all: all

all: $(OBJS)

Name your program something else, not all.