workshops/slides/makefiles/makefiles.md

title	author	theme	colortheme
Making Makefiles	Malin	Warsaw	orchid

Intro

• input, process, output.
• automatic idempotence
• Gotcha: directories
• This, that, and these

---

Variables

• From your shell.
• New variables.
• Filenames as variables.
• Gotcha: no shell variables, only make!

Equality

• Variables with '=', never ':='.
• Gotcha: one shell per line.
• Variables as shell output.

---

Phonies, and the Problems with Lies

• clean (common)
• check (excellent)

---

Non-Compiling Checks

• make -n
• Gotcha: shell output variables.

---

The Fourth Sigil: %

• Standard rules, e.g. ImageMagick, copying, et c.
• Gotcha: intermediaries are deleted.

---

Bling: make2graph

• Gotcha: completely outdated.

---

Inclusivity

• include dir/Makefile
• Gotcha: directory has not changed
• $(MAKEFILE_LIST)

Special Commands

• dirname
• DIR = test -d $(dirname $@) || mkdir $(dirname $@)
• patsubst
• Wildcards (or not?)

Maintanance

• backups
• saving files