itechmeat/llm-code/makefile

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GNU Make automation and build system guidance. Use when creating or maintaining Makefiles, writing Make targets and recipes, or configuring GNU Make build automation. Keywords: Makefile, GNU Make, targets, recipes, build automation.

Install

npx vskill@latest install itechmeat/llm-code/makefile

SKILL.md

Makefile Skill

Guidance for creating and maintaining GNU Make build automation.

Quick Navigation

TopicReference
Rules, prerequisites, targetssyntax.md
Variable types and assignmentvariables.md
Built-in functionsfunctions.md
Special and phony targetstargets.md
Recipe execution, parallelrecipes.md
Implicit and pattern rulesimplicit.md
Common practical patternspatterns.md

Core Concepts

Rule Structure
makefile
target: prerequisites
recipe

Critical: Recipe lines MUST start with TAB character.

File vs Phony Targets
makefile
# File target - creates/updates a file
build/app.o: src/app.c
$(CC) -c $< -o $@
# Phony target - action, not a file
.PHONY: clean test install
clean:
rm -rf build/
Variable Assignment
OperatorNameWhen Expanded
:=SimpleOnce, at definition
?=ConditionalIf not already set
=RecursiveEach use (late binding)
+=AppendAdds to existing value
makefile
CC := gcc # Immediate
CFLAGS ?= -O2 # Default, overridable
DEBUG = $(VERBOSE) # Late binding
CFLAGS += -Wall # Append
Automatic Variables
VariableMeaning
$@Target
$<First prerequisite
$^All prerequisites (unique)
$?Prerequisites newer than target
$*Stem in pattern rules

Essential Patterns

Self-Documenting Help
makefile
.DEFAULT_GOAL := help
help: ## Show available targets
@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
awk 'BEGIN {FS = ":.*?## "}; {printf " %-15s %s\n", $$1, $$2}'
install: ## Install dependencies
uv sync
test: ## Run tests
uv run pytest
Platform Detection
makefile
UNAME_S := $(shell uname -s)
ifeq ($(UNAME_S),Darwin)
OPEN := open
else ifeq ($(UNAME_S),Linux)
OPEN := xdg-open
endif
Build Directory
makefile
BUILDDIR := build
SOURCES := $(wildcard src/*.c)
OBJECTS := $(patsubst src/%.c,$(BUILDDIR)/%.o,$(SOURCES))
$(BUILDDIR)/%.o: src/%.c | $(BUILDDIR)
$(CC) -c $< -o $@
$(BUILDDIR):
mkdir -p $@
Environment Export
makefile
export PYTHONPATH := $(PWD)/src
export DATABASE_URL
test:
pytest tests/ # sees exported variables

Common Targets

Quality Checks
makefile
.PHONY: lint format check test
lint: ## Run linters
ruff check .
mypy src/
format: ## Format code
ruff format .
check: format lint test ## All quality checks
Cleanup
makefile
.PHONY: clean clean-all
clean: ## Remove build artifacts
rm -rf build/ dist/ *.egg-info
find . -type d -name __pycache__ -exec rm -rf {} + 2>/dev/null || true
clean-all: clean ## Remove all generated files
rm -rf .venv .pytest_cache .mypy_cache
Docker Integration
makefile
IMAGE := myapp
VERSION := $(shell git describe --tags --always)
docker-build: ## Build Docker image
docker build -t $(IMAGE):$(VERSION) .
docker-run: ## Run container
docker run -d -p 8000:8000 $(IMAGE):$(VERSION)

Recipe Execution

Each Line = Separate Shell
makefile
# Won't work - cd lost between lines
bad:
cd subdir
pwd # Still in original dir!
# Correct - combine commands
good:
cd subdir && pwd
# Or use line continuation
also-good:
cd subdir && \
pwd && \
make
Silent and Error Handling
makefile
target:
@echo "@ suppresses command echo"
-rm -f maybe.txt # - ignores errors
Parallel Execution
bash
make -j4 # 4 parallel jobs
make -j4 lint test # Run lint and test in parallel

Output Discipline

One line in, one line out. Avoid echo spam.

makefile
# ❌ Too chatty
start:
@echo "Starting services..."
docker compose up -d
@echo "Waiting..."
@sleep 3
@echo "Done!"
# ✅ Concise
start: ## Start services
@echo "Starting at http://localhost:8000 ..."
@docker compose up -d
@echo "Logs: docker compose logs -f"

Conditionals

makefile
DEBUG ?= 0
ifeq ($(DEBUG),1)
CFLAGS += -g -O0
else
CFLAGS += -O2
endif
ifdef CI
TEST_FLAGS := --ci
endif

Including Files

makefile
# Required include (error if missing)
include config.mk
# Optional include (silent if missing)
-include local.mk
-include .env

Common Pitfalls

PitfallProblemSolution
Spaces in recipesRecipes need TABUse actual TAB character
Missing .PHONYmake test fails if test file existsDeclare .PHONY: test
cd in recipesEach line is new shellUse cd dir && command
= vs := confusionUnexpected late expansionUse := by default
Unexported varsSubprocesses don't see varsexport VAR
Complex shell in makeHard to maintainMove to external script

Quick Reference

makefile
# Makefile Template
.DEFAULT_GOAL := help
SHELL := /bin/bash
.SHELLFLAGS := -ec
.PHONY: help install test lint format clean
help: ## Show this help
@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
awk 'BEGIN {FS = ":.*?## "}; {printf " %-15s %s\n", $$1, $$2}'
install: ## Install dependencies
uv sync --extra dev
test: ## Run tests
uv run pytest tests/ -v
lint: ## Run linters
uv run ruff check .
format: ## Format code
uv run ruff format .
clean: ## Clean artifacts
rm -rf build/ dist/ .pytest_cache

Links

See Also

Security

  • Security scanPassed, 100 of 100Pattern checks on the skill's files.
  • Model reviewNot runA model review is scheduled for the next rescan.

Quality evaluation

  • Task evaluationWarning, 83 of 100Marginal. 1 run. Evaluated 7 months ago.

Source

Popularity

Repository stars
10
7-day trend score
12

Stars and forks are for the whole GitHub repository, not this skill alone. Refreshed 24 Mar 2026, 7 months ago.

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