makefile can not be used when making a shared object

Makefile is a build automation tool that is used to build executable programs and libraries from source code. To create a shared object using Makefile, you need to specify the appropriate compiler flags and linker flags for building shared objects.

Here is an example Makefile for building a shared object:

CC=gcc
CFLAGS=-fPIC -Wall -Wextra -O2
LDFLAGS=-shared

all: libexample.so

libexample.so: example.o
	$(CC) $(LDFLAGS) -o $@ $<

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

clean:
	rm -f *.o *.so

In this Makefile, the `-fPIC` flag is used to generate position-independent code, which is required for building shared objects. The `-shared` flag is used to specify that we want to build a shared object.

To build the shared object, simply run the `make` command in the directory where the Makefile is located. The resulting shared object will be named `libexample.so`.

I hope this helps! Let me know if you have any further questions.