C Shared Object Library makefile

Question

I am trying to create a makefile that will create a shared library using the my_sin.o, my_cos.o, and my_tan.o files. I was able to create a static version but am having issues with the changes needed for a shared Library.

Currently also getting the following output when I attempt to make. I have verified that everything that should be a tab is.

make: Nothing to be done for 'libmy_math.so'.

Makefile:

CC=gcc

CFLAGS=-fPIC -Wall -g

OBJECTS=my_sin.o my_cos.o my_tan.o

LIBDIR=-L/home/devin/Desktop/CSCV352/Week9/HW_9_5/HW_9_5

libmy_math.so: my_sin.o my_cos.o my_tan.o

test_9_5:$(OBJECTS) main.c libmy_math.so

.c.o:
        $(CC) $(CFLAGS) -c $<

clean:
        rm -f *~
        rm -f *.o
        rm -f test_9_5

Answer 1

The file 'libmy_math.so' doesn't exist yet or the makefile can't find it. If you want 'libmy_math.so' to be created by the makefile, there needs to be a rule where libmy_math.so appears on the left of the colon.