Makefile Patterns
Using the basic example, you can make a complete backup of all backup files.
This file will depend upon everything inside the $(storage_directory).
Unlike bash, you can't just say storage_directory/*: the pattern must be stated as a 'wildcard'.
1$(storage_directory)/backup.tgz: $(wildcard $(storage_directory)/*.md)
2 tar czf $@ $^
The make rules start by processing variables:
1backups/backup.tgz: $(wildcard backups/*.md)
2 tar czf backups/backup.tgz $^
Then the wildcard variable equals whichever backup files are in the backups/ directory:
1backups/backup.tgz: backups/backup_29.md backups/backup_30.md
2 tar czf backups/backup.tgz backups/backup_29.md backups/backup_30.md
The phony backup target should now point to this tar backup.
1current_minute != date +%M
2
3storage_directory = backups
4
5.PHONY: backup
6backup: $(storage_directory)/backup.tgz
7$(storage_directory)/backup.tgz: $(wildcard $(storage_directory)/*.md)
8 tar czf $@ $^
9
10README.md: Makefile
11 echo "Basic makefile example." > $@
12 echo "" >> $@
13 echo '```' >> $@
14 cat $< >> $@
15 echo '```' >> $@
16
17$(storage_directory)/backup_$(current_minute).md: README.md
18 mkdir -p $(@D)
19 cp $< $@