add basic makefile examples

slides/makefiles/makefiles.md

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+---
+title:
+- Making Makefiles
+author:
+- Malin
+
+theme:
+- Warsaw
+colortheme:
+- 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+- *Gotcha*: completely outdated.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