makefile for creating (.so) file from existing files

Question

I have 4 files: 1.c, 1.h, 2.c, 2.h. I need a makefile, which will create a dynamic library (.so) from tho

Answer 1

CC = gcc                                # C compiler
CFLAGS = -fPIC -Wall -Wextra -g         # C flags
LDFLAGS = -shared                       # linking flags
RM = rm -f                              # rm command
TARGET_LIB = sh_main.so                 # target lib

SRCS = add.c sub.c main.c               # source file
DEPS = header.h                         # header file
OBJS = $(SRCS:.c=.o)                    # object file

.PHONY: all
all: ${TARGET_LIB}

$(TARGET_LIB): $(OBJS)
        $(CC) ${LDFLAGS} -o $@ $^       # -o $@ says, put the output of the compilation in the file named on the left side of the :

$(SRCS:.c=.d):%.d:%.c
        $(CC) $(CFLAGS) -MM $< >$@      # the $< is the first item in the dependencies list, and the CFLAGS macro is defined as above
include $(SRCS:.c=.d)

.PHONY: clean
clean:
        -${RM} ${TARGET_LIB} ${OBJS} $(SRCS:.c=.d)

After the shared library created successfully. We need to install it.
Become the root user.
Copy the shared library into standard directory "/usr/lib".
Run ldcofig command.

Recompile your .c file with shared library. root@Admin:~/C/SharedLibrary# gcc -c main.c root@Admin:~/C/SharedLibrary# gcc -o main main.o sh_main.so

root@Admin:~/C/SharedLibrary# ldd main

Note: In my case.
main.c: main C file
sh_main.so: shared library.