What is a Makefile used for?

A Makefile is used to define a set of tasks to be executed. It is commonly used in software development to automate the build process of a project. Here are some key purposes of a Makefile:

1. Compilation Management: It specifies how to compile and link the program, detailing which source files need to be compiled and how they depend on each other.

2. Automation: It automates repetitive tasks, such as building executables, running tests, and cleaning up temporary files.

3. Dependency Tracking: It tracks dependencies between files, ensuring that only the necessary parts of the project are rebuilt when changes are made.

4. Custom Commands: It allows users to define custom commands that can be executed with simple commands in the terminal.

A typical Makefile consists of rules that define how to build targets, along with dependencies and commands to execute. Here's a simple example:

# Makefile example
CC = gcc
CFLAGS = -Wall

all: myprogram

myprogram: main.o utils.o
	$(CC) -o myprogram main.o utils.o

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

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

clean:
	rm -f *.o myprogram

In this example, the Makefile defines how to compile a program called myprogram from main.c and utils.c, and includes a clean target to remove generated files.