Makefile & Build

---

name: makefile-build description: Write Makefiles for any project type. Use when setting up build automation, defining multi-target builds, managing dependencies between tasks, creating project task runners, or using Make for non-C projects (Go, Python, Docker, Node.js). Also covers Just and Task as modern alternatives. metadata: {"clawdbot":{"emoji":"🔨","requires":{"anyBins":["make","just","task"]},"os":["linux","darwin","win32"]}}

---

Makefile & Build

Write Makefiles for project automation across any language. Covers targets, dependencies, variables, pattern rules, phony targets, and using Make for Go, Python, Docker, and Node.js projects. Includes Just and Task as modern alternatives.

When to Use

Automating build, test, lint, deploy commands

Defining dependencies between tasks (build before test)

Creating a project-level task runner (consistent across team)

Replacing long CLI commands with short memorable targets

Managing multi-step build processes

Any project that needs a make build && make test && make deploy workflow

Makefile Basics

Structure

# target: prerequisites
    recipe (MUST be indented with TAB, not spaces)
build: src/main.go
	go build -o bin/app src/main.go
test: build
	go test ./...
clean:
	rm -rf bin/
First target is the default (runs with bare make)

Variables

# Simple assignment
CC = gcc
CFLAGS = -Wall -O2
Deferred assignment (expanded when used)
FILES = $(wildcard src/*.go)
Immediate assignment (expanded when defined)
VERSION := $(shell git describe --tags --always)
Conditional assignment (only if not already set)
PORT ?= 8080
Use variables
build:
	$(CC) $(CFLAGS) -o app main.c
	@echo "Version: $(VERSION)"

Automatic variables

# $@ = target name
$< = first prerequisite
$^ = all prerequisites
$* = stem (pattern match)
$(@D) = directory of target
$(@F) = filename of target
bin/app: src/main.go src/util.go
	go build -o $@ $^
$@ = bin/app
$^ = src/main.go src/util.go
$< = src/main.go
Pattern rule
%.o: %.c
	$(CC) -c -o $@ $<
For foo.o: $@ = foo.o, $< = foo.c, $* = foo

Phony targets (not files)

# Without .PHONY, if a file named "clean" exists, make clean does nothing
.PHONY: build test clean lint fmt help
build:
	go build -o bin/app ./cmd/app
test:
	go test ./...
clean:
	rm -rf bin/ dist/
List all targets
help:
	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | \
		awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2}'

Self-documenting Makefile

.DEFAULT_GOAL := help
build: ## Build the application
	go build -o bin/app ./cmd/app
test: ## Run all tests
	go test -v ./...
lint: ## Run linters
	golangci-lint run
clean: ## Remove build artifacts
	rm -rf bin/ dist/
help: ## Show this help
	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | \
		awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2}'

Language-Specific Makefiles

Go

BINARY_NAME := myapp
VERSION := $(shell git describe --tags --always --dirty)
LDFLAGS := -ldflags "-X main.version=$(VERSION)"
GOFILES := $(shell find . -name '*.go' -not -path './vendor/*')
.PHONY: all build test lint clean run
all: lint test build
build: ## Build binary
	CGO_ENABLED=0 go build $(LDFLAGS) -o bin/$(BINARY_NAME) ./cmd/$(BINARY_NAME)
test: ## Run tests
	go test -race -coverprofile=coverage.out ./...
test-coverage: test ## Show coverage report
	go tool cover -html=coverage.out
lint: ## Run linters
	golangci-lint run ./...
fmt: ## Format code
	gofmt -w $(GOFILES)
run: build ## Build and run
	./bin/$(BINARY_NAME)
clean: ## Clean build artifacts
	rm -rf bin/ coverage.out
Cross-compilation
build-linux: ## Build for Linux
	GOOS=linux GOARCH=amd64 go build $(LDFLAGS) -o bin/$(BINARY_NAME)-linux-amd64 ./cmd/$(BINARY_NAME)
build-all: ## Build for all platforms
	GOOS=linux GOARCH=amd64 go build $(LDFLAGS) -o bin/$(BINARY_NAME)-linux-amd64 ./cmd/$(BINARY_NAME)
	GOOS=darwin GOARCH=arm64 go build $(LDFLAGS) -o bin/$(BINARY_NAME)-darwin-arm64 ./cmd/$(BINARY_NAME)
	GOOS=windows GOARCH=amd64 go build $(LDFLAGS) -o bin/$(BINARY_NAME)-windows-amd64.exe ./cmd/$(BINARY_NAME)

Python

PYTHON := python3
VENV := .venv
BIN := $(VENV)/bin
.PHONY: all install test lint fmt clean run
all: install lint test
$(VENV)/bin/activate:
	$(PYTHON) -m venv $(VENV)
	$(BIN)/pip install --upgrade pip
install: $(VENV)/bin/activate ## Install dependencies
	$(BIN)/pip install -r requirements.txt
	$(BIN)/pip install -r requirements-dev.txt
test: ## Run tests
	$(BIN)/pytest -v --cov=src --cov-report=term-missing
lint: ## Run linters
	$(BIN)/ruff check src/ tests/
	$(BIN)/mypy src/
fmt: ## Format code
	$(BIN)/ruff format src/ tests/
run: ## Run application
	$(BIN)/python -m src.main
clean: ## Remove venv and caches
	rm -rf $(VENV) __pycache__ .pytest_cache .mypy_cache .ruff_cache
	find . -type d -name '__pycache__' -exec rm -rf {} + 2>/dev/null || true

Node.js / TypeScript

.PHONY: all install build test lint clean dev
all: install lint test build
node_modules: package.json
	npm install
	@touch node_modules
install: node_modules ## Install dependencies
build: node_modules ## Build TypeScript
	npx tsc
test: node_modules ## Run tests
	npx vitest run
test-watch: node_modules ## Run tests in watch mode
	npx vitest
lint: node_modules ## Lint code
	npx eslint src/ --ext .ts,.tsx
	npx tsc --noEmit
fmt: node_modules ## Format code
	npx prettier --write 'src/**/*.{ts,tsx}'
dev: node_modules ## Run in development mode
	npx tsx watch src/index.ts
clean: ## Clean build artifacts
	rm -rf dist/ node_modules/.cache

Docker

IMAGE_NAME := myapp
VERSION := $(shell git describe --tags --always)
REGISTRY := ghcr.io/myorg
.PHONY: build push run stop clean
build: ## Build Docker image
	docker build -t $(IMAGE_NAME):$(VERSION) -t $(IMAGE_NAME):latest .
push: build ## Push to registry
	docker tag $(IMAGE_NAME):$(VERSION) $(REGISTRY)/$(IMAGE_NAME):$(VERSION)
	docker tag $(IMAGE_NAME):latest $(REGISTRY)/$(IMAGE_NAME):latest
	docker push $(REGISTRY)/$(IMAGE_NAME):$(VERSION)
	docker push $(REGISTRY)/$(IMAGE_NAME):latest
run: ## Run container
	docker run --rm -p 8080:8080 --name $(IMAGE_NAME) $(IMAGE_NAME):latest
stop: ## Stop container
	docker stop $(IMAGE_NAME) 2>/dev/null || true
clean: ## Remove images
	docker rmi $(IMAGE_NAME):$(VERSION) $(IMAGE_NAME):latest 2>/dev/null || true
compose-up: ## Start with docker compose
	docker compose up -d --build
compose-down: ## Stop compose
	docker compose down
compose-logs: ## Follow compose logs
	docker compose logs -f

Advanced Patterns

Conditional logic

# OS detection
UNAME := $(shell uname -s)
ifeq ($(UNAME),Darwin)
    SED := sed -i ''
else
    SED := sed -i
endif
Environment-based config
ENV ?= development
ifeq ($(ENV),production)
    CFLAGS += -O2
    LDFLAGS += -s -w
else
    CFLAGS += -g -O0
endif
Check if command exists
HAS_DOCKER := $(shell command -v docker 2>/dev/null)
docker-build:
ifndef HAS_DOCKER
	$(error "docker is not installed")
endif
	docker build -t myapp .

Multi-directory builds

SERVICES := api worker scheduler
.PHONY: build-all test-all $(SERVICES)
build-all: $(SERVICES)
$(SERVICES):
	$(MAKE) -C services/$@ build
test-all:
	@for svc in $(SERVICES); do \
		echo "Testing $$svc..."; \
		$(MAKE) -C services/$$svc test || exit 1; \
	done

Include other Makefiles

# Split large Makefile into modules
include mk/docker.mk
include mk/test.mk
include mk/deploy.mk
Optional include (no error if missing)
-include .env.mk

Silent execution and output control

# @ suppresses command echo
install:
	@echo "Installing dependencies..."
	@npm install
.SILENT for entire targets
.SILENT: help clean
Make less verbose globally
MAKEFLAGS += --no-print-directory

Just (Modern Alternative)

Justfile syntax

# justfile — simpler than Make, no TAB requirement
Set shell
set shell := ["bash", "-euo", "pipefail", "-c"]
Variables
version := git describe --tags --always
default_port := "8080"
Default recipe (first one)
default: lint test build
Recipes
build: ## Build the application
    go build -ldflags "-X main.version={{version}}" -o bin/app ./cmd/app
test: ## Run tests
    go test -race ./...
lint: ## Run linters
    golangci-lint run
run port=default_port: build ## Run with optional port
    ./bin/app --port {{port}}
clean: ## Clean artifacts
    rm -rf bin/ dist/
Recipes with dependencies
deploy: build test
    ./scripts/deploy.sh
OS-specific
[linux]
install-deps:
    sudo apt install -y build-essential
[macos]
install-deps:
    brew install go golangci-lint
List recipes
help:
    @just --list

# Install: https://github.com/casey/just
Run:
just          # Default recipe
just build    # Specific recipe
just run 9090 # With argument
just --list   # List all recipes

Task (Go Task Runner)

Taskfile.yml

# Taskfile.yml
version: '3'
vars:
  VERSION:
    sh: git describe --tags --always
  BINARY: myapp
tasks:
  default:
    deps: [lint, test, build]
  build:
    desc: Build the application
    cmds:
      - go build -ldflags "-X main.version={{.VERSION}}" -o bin/{{.BINARY}} ./cmd/{{.BINARY}}
    sources:
      - ./**/*.go
    generates:
      - bin/{{.BINARY}}
  test:
    desc: Run tests
    cmds:
      - go test -race ./...
  lint:
    desc: Run linters
    cmds:
      - golangci-lint run
  run:
    desc: Build and run
    deps: [build]
    cmds:
      - ./bin/{{.BINARY}} {{.CLI_ARGS}}
  clean:
    desc: Clean artifacts
    cmds:
      - rm -rf bin/ dist/
  docker:build:
    desc: Build Docker image
    cmds:
      - docker build -t {{.BINARY}}:{{.VERSION}} .
  # Task with preconditions
  deploy:
    desc: Deploy to production
    preconditions:
      - sh: test -f bin/{{.BINARY}}
        msg: "Build first: task build"
      - sh: git diff --quiet
        msg: "Uncommitted changes detected"
    cmds:
      - ./scripts/deploy.sh

# Install: https://taskfile.dev/installation/
Run:
task          # Default task
task build    # Specific task
task --list   # List all tasks

Make vs Just vs Task

| Feature | Make | Just | Task | |---|---|---|---| | Config format | Makefile (TAB-sensitive) | justfile | Taskfile.yml | | Dependencies | File-based + phony | Recipe-based | Task-based | | File change detection | Built-in | No | sources/generates | | Variables | Yes (complex) | Yes (simple) | Yes (YAML) | | Cross-platform | Needs make installed | Single binary | Single binary | | Learning curve | High | Low | Low | | Best for | C/C++ builds, complex deps | Task runner replacement | YAML-native projects |

Tips

The number one Makefile bug: using spaces instead of tabs for indentation. Make requires literal TAB characters in recipes.

.PHONY every target that isn't a real file. Without it, make clean won't run if a file named clean exists.

Use @ prefix to suppress command echo for cleaner output: @echo "Building..." prints only "Building...", not the echo command itself.

The self-documenting help target (with ## comments) is worth adding to every Makefile. make help becomes the project's command reference.

Make is overkill for simple task running. If you just want named commands, Just or Task are simpler and don't have the TAB footgun.

Use ?= for variables users might want to override: PORT ?= 8080 lets PORT=9090 make run work.

For polyglot projects (Go + Python + Docker), a Makefile at the root that delegates to language-specific tools is a clean pattern.

Make's file-based dependency tracking is genuinely powerful for build systems. If your project compiles files, Make's target: prerequisites model avoids unnecessary rebuilds.

The number one Makefile bug: using spaces instead of tabs for indentation. Make requires literal TAB characters in recipes.

.PHONY every target that isn't a real file. Without it, make clean won't run if a file named clean exists.

Use @ prefix to suppress command echo for cleaner output: @echo "Building..." prints only "Building...", not the echo command itself.

The self-documenting help target (with ## comments) is worth adding to every Makefile. make help becomes the project's command reference.

Make is overkill for simple task running. If you just want named commands, Just or Task are simpler and don't have the TAB footgun.

Use ?= for variables users might want to override: PORT ?= 8080 lets PORT=9090 make run work.

For polyglot projects (Go + Python + Docker), a Makefile at the root that delegates to language-specific tools is a clean pattern.

Make's file-based dependency tracking is genuinely powerful for build systems. If your project compiles files, Make's target: prerequisites model avoids unnecessary rebuilds.