Question 1

What is a Makefile and when should I use one?

Accepted Answer

A Makefile is a build automation file used by the make utility. It defines targets (tasks) and their dependencies. Use it to automate compilation, testing, deployment, and cleanup tasks in C, C++, Go, and other projects. It saves time by rebuilding only changed files.

Question 2

Why must Makefile commands be indented with a tab, not spaces?

Accepted Answer

The make utility was designed in 1976 and requires recipe lines to start with a literal tab character. Using spaces causes a 'missing separator' error. Most code editors can be configured to insert a tab when pressing Tab in Makefiles.

Question 3

What does .PHONY mean in a Makefile?

Accepted Answer

.PHONY declares targets that are not actual files. Without it, if a file named 'clean' exists in the directory, make clean would do nothing (the target appears up-to-date). Marking it .PHONY ensures the commands always run regardless of file existence.

Question 4

Can I use variables in a Makefile?

Accepted Answer

Yes. Variables are defined with NAME = value or NAME := value (immediate expansion). Reference them with $(NAME). Common variables are CC (C compiler), CFLAGS (compiler flags), TARGET (output binary name), and SRCS (source files list).

Question 5

How can I run a specific Makefile target?

Accepted Answer

Run make followed by the target name: make build, make test, make clean. Running just make runs the first target defined (usually 'all'). You can also run multiple targets: make clean build.

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