I have tried to make a makefile from a template and this is what I've got:
CFLAGS = -Wall -pedantic
LFLAGS = -lpthread
CC = gcc
OBJS = bank5.o client2.o
PROGRAM = ex2
all: bank client
ex2: $(OBJS)
$(CC) $(LFLAGS) $(OBJS) -o $(PROGRAM)
bank: bank5.c
$(CC) $(CFLAGS) -c bank5.c receive_message.c send_message.c -o bank5
client: client2.c
$(CC) $(CFLAGS) -c client2.c receive_message.c send_message.c -o client2
When I try to run it I get this error:
gcc -Wall -pedantic -c bank5.c receive_message.c send_message.c -o bank5
gcc: fatal error: cannot specify -o with -c, -S or -E with multiple files
compilation terminated.
make: *** [bank] Error 4
This is what my makefile looked like before -Wall and -pedantic, this ran normally:
all: bank client
bank: bank5.c
gcc bank5.c receive_message.c send_message.c -o bank5 -lpthread
client: client2.c
gcc -o client2 client2.c send_message.c receive_message.c
-c
will just compile each file (i.e., produce an object file), not link them together. Because one object file corresponds to one source file, multiple object files will be created.-o
specifies one output file.Obviously, both contradict each other.
Remove the
-c
to fix the problem.Anyway, your makefile looks broken. What does
ex2
do there?bank5.o
andclient2.o
are nowhere created.