Build systems: make

Today's lesson is presented by Josh Asplund

On this page

An introduction to make
Defining variables
Evaluating multiple rules
Special targets
Automatic variables
Questions

This lesson contains approximately 35 minutes of video content.

An introduction to make

Defining variables

Evaluating multiple rules

Special targets

Automatic variables

Questions

QMake Q1

This question is ungraded.

What is a makefile? Select the best answer.

A C++ file that is compiled alongside program files.

A configuration file that describes how to produce a target from prerequisite files.

A file required by C++ to compile source code.

A file that C++ code requires in order to run.

Practice question: try as many times as you like

Questions 2-6

Please answer questions 2-6 with respect to the following Makefile:

CXX=clang++
CXX_FLAGS=-std=c++20 -Iincludes -g -fstandalone-debug -O0 -Wall -Wextra -Werror

exec: bin/exec
tests: bin/tests

bin/exec: ./src/main.cc ./src/functions.cc
	$(CXX) $(CXX_FLAGS) $^ -o $@

bin/tests: ./tests/tests.cc ./src/functions.cc
	$(CXX) $(CXX_FLAGS) $^ -o $@

.DEFAULT_GOAL := tests
.PHONY: exec tests clean

clean:
	rm -f bin/*

QMake Q2

This question is ungraded.

Why was exec a phony target? Select the best answer.

The prerequisite files for `exec` mirrors `bin/exec`.

The recipe for `exec` only compiles `main.cc`.

The recipe for `exec` only runs `bin/exec`.

`exec` is a target that will always run irrespective of the state of the file system.

Practice question: try as many times as you like

QMake Q3

This question is ungraded.

What source files will make exec compile?

`exec`

`functions.cc`

`main.cc`

`main.cc` and `functions.cc`.

Practice question: try as many times as you like

QMake Q4

This question is ungraded.

Given the following make command/commands, which command/commands generate the executable bin/tests? Select the single best, most comprehensive answer.

`main.cc`

`make tests`

`make` and `make tests`.

`test make`

Practice question: try as many times as you like

QMake Q5

This question is ungraded.

What will make clean do? Select the single best answer.

Does nothing.

Remove all files from the `bin` directory.

Remove all files from the project's root directory.

Removes only the executable `exec` from the `bin` directory.

Practice question: try as many times as you like

QMake Q6

This question is ungraded.

Is CXX is a variable?

False.

True.

Practice question: try as many times as you like