cheatsheets/makefile.md

title	layout
Makefile	default

Var assignment

JS_COMPRESSOR := $(uglify)

# Safe assignment
prefix ?= /usr/local

Magic variables

$^   -- dependencies
$@   -- the thing to be built

$@   -- Rule target
$%   -- Target member name ('foo' in 'foo.c' for '%.c')
$^   -- Prerequisites (all, without duplication)
$+   -- Prerequisites (all, with duplication)
$?   -- Prerequisites (new ones)
$|   -- Prerequisites (order-only?)
$<   -- Prerequisite (first)
$*   -- Basename without extension of the target (?)

Command prefixes

-    Ignore errors
@    Don't print command
+    Run even if Make is in 'don't execute' mode

Examples:

build:
    @echo "Building"
    -gcc $< $@
    @echo "Construction complete"

-include .depend

Cool stuff

gitdir ?= $(shell git --exec-path)
gitver ?= $(word 3,$(shell git --version))

Find files

FILES = $(shell find images -name "*")
FILES = $(shell find test/*.js)

$(patsubst images/%, assets/%, $(shell find images -name "*"))

Substitutions

# Same
$(SOURCE:.cpp=.o)
$(patsubst %.cpp, %.c, $(SOURCES))

$(strip $(string_var))

$(filter %.less, $(files))
$(filter-out %.less, $(files))

Executing

JS_COMPRESSOR := $(uglify)

docs:
  $(JS_COMPRESSOR) file.js

Building files

%.o: %.c
  ffmpeg -i $< > $@   # Input and output
  foo $^

Inclusion

include assets.make