first commit

Makefile

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+#############GUIDE LIST##########################################
+#   G1.     CC:                                                 #
+#               Flag to mention the C compiler to used.         #
+#                                                               #
+#   G2.     CFLAGS:                                             #
+#           Flag to specify the option for C compiler.          #
+#                                                               #
+#   G3.     OUTPUT_OPTION:                                      #
+#               Tells compiler(mainly gcc or clang) to find     #
+#               the dependencies(include header file) of src    #
+#               file and add those to *.d files. This is a      #
+#               easy workaround for G12.                        #
+#                                                               #
+#   G4.     CXX:                                                #
+#               Flag to mention the C++ compiler to used.       #
+#                                                               #
+#   G5.     CXXFLAGS:                                           #
+#               Flag to specify the option for C++ compiler.    #
+#                                                               #
+#   G6.     EXE_NAME:                                           #
+#               Name of the executable to be created.           #
+#                                                               #
+#   G7.     SOURCE:                                             #
+#               All the source to be used for compilation.      #
+#                                                               #
+#   G8.     OBJS:                                               #
+#               All the object file for linking.                #
+#                                                               #
+#   G9.     DEPS:                                               #
+#               All the dependencies information file.          #
+#                                                               #
+#   G10.    -include                                            #
+#               Tells GNU make to include all the file to       #
+#               specify dependencies. Healthy replacment of     #
+#               G12.                                            #
+#                                                               #
+#   G11.    "Mentioned below"                                   #
+#                                                               #
+#   G12.    "Mentioned below"                                   #
+#                                                               #
+#   G13.    "Mentioned below"                                   #
+#                                                               #
+#   G14.    "Mentioned below"                                   #
+#################################################################
+
+#include Makefile.config
+
+#Flags
+# C program
+CC                              = gcc
+CFLAGS                          = -g
+OUTPUT_OPTION                   = -MMD -MP -o $@
+SHARED_LIBRARY_EXTENSION        = so  
+SHARED_LIBRARY_FLAG             = -shared
+
+# C++ program
+#CXX         = g++
+#CXXFLAGS   = -g
+
+#Variables
+EXE_NAME    = exe                       #Executable name.
+SOURCE      = $(wildcard *.c)           #Source files.
+OBJS        = $(SOURCE:.c=.o)           #Object files.
+DEPS        = $(SOURCE:.c:.d)           #dependencies (To know the include files used in src)
+-include      ${DEPS}
+LIB         = lib
+# OR can provide name of the file individually.
+# The above for files present in the same directory as this
+# files is present.
+# 
+# .d files look like a part of Makefile.
+# and it IS the part of Makefile.
+
+
+##G11.
+#####RULES IN MAKEFILE###################################
+#   ruleName: "files that are dependencies"             #
+#               "Specify the commands to be executed"   #
+#                                                       #
+#       These are the rules that Makefile uses          #
+#       to do the operations, as a build tool.          #
+#########################################################
+
+
+#Executables and library with dependencies
+
+${EXE_NAME}: ${OBJS}
+                ${CC} ${OJBS} -o ${EXE_NAME}
+
+
+##G12.
+#####SOURCE FILE DEPENDENT ON HEADER FILE################
+#   "src or obj file": "header file"                    #
+#            for exe -> src.o: header.h                 #
+#                                                       #
+#       If the src file of the given header file is     #
+#       modified then, this specification ensures       #
+#       the compilation of that source file if any      #
+#       change is done.                                 #
+#########################################################
+
+
+#Friendly help rule.
+help:
+        -@echo "Customise the help rule to print help log."
+
+
+##G13.
+#######HIDING AND SKIPPING COMMANDS##########################
+# -@ Tells the GNU make to not print the command before     #
+#   executing it and enable to skip the command if it       #
+#   failed to compile, as make stop if any command fails.   #
+#############################################################
+
+
+#Building the Static library.
+${LIB}: ${OBJS}
+        ar cr ${LIB}.a ${OBJS}
+
+#Shorthand of doing the above same thing
+${LIB}: ${LIB}(${OBJS})
+
+
+#This link is about creating and using shared library
+#https://www.cprogramming.com/tutorial/shared-libraries-linux-gcc.html
+
+#Bulding the dynamic library.
+${LIB}.${SHARED_LIBRARY_EXTENSION}: ${OBJS}
+        ${CC} ${SHARED_LIBRARY_FLAG} -o $@ $^
+
+##G14.
+###MEANING OF $@ AND $^ SYMBOLS ON ABOVE RULE####################
+#       $@ -> Replacing itself with rule under which            #
+#             its written.                                      #
+#       $^ -> Replacing itself with dependencies of rule.       #
+#################################################################
+
+
+#Rules for cleaning.
+clean:
+        -@rm -f ${OBJS}
+
+realclean: clean
+        -@rm -f ${LIB}

Makefile.config

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+#Flags
+# C program
+CC                              = gcc
+CFLAGS                          = -g
+OUTPUT_OPTION                   = -MMD -MP -o $@
+SHARED_LIBRARY_EXTENSION        = so  
+SHARED_LIBRARY_FLAG             = -shared
+
+# C++ program
+#CXX         = g++
+#CXXFLAGS   = -g
+
+#   This file can be solely used to configure
+#   according the OS and tools used for building
+#   programs.
+#
+#   This make the Makefile more clean and easy to
+#   use.

Makefile.config.in

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+#Flags
+# C program
+CC                              = @CC@
+CFLAGS                          = -g
+OUTPUT_OPTION                   = -MMD -MP -o $@
+SHARED_LIBRARY_EXTENSION        = so  
+SHARED_LIBRARY_FLAG             = -shared
+
+# C++ program
+#CXX         = g++
+#CXXFLAGS   = -g
+
+
+#   These kind of files are used as an input
+#   for autoconf tools to automatically
+#   configure makefile based on the OS and 
+#   tools used.

configure.in

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+AC_INIT(["Name of Program"], [ Version X.X.X], ["author email"])
+
+AM_INIT_AUTOMAKE
+
+AC_CHECK_PROGS(CC,[clang, gcc, xlc, icc], [""])
+AC_PROG_CC
+AC_SUBST(CC)
+
+AC_CHECK_HEADERS(string.h)
+AC_CHECK_HEADERS(strings.h)
+
+AC_CONFIG_FILES([Makefile.config])
+AC_CONFIG_HEADERS([config.h])
+AC_OUTPUT
+
+
+
+###GUIDE LIST############
+#
+#   G1. AC_INIT():
+#       Tells autoconf tool to make