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# Writing Makefiles
## Pattern rules
In prerequesite, use exactly one `%`. Can then be used in requirements. E.g.
%.o: %.c
# compile .c file to .o
Details: <https://www.gnu.org/software/make/manual/html_node/Pattern-Rules.html>
## Automatic variables
* `$@`: current target
* `$<`: first prerequisite
* `$^`: all prerequisites, separated by spaces
* `$*`: target without extension
* `$(@F)`: file-within-directory part of target path
More: <https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html>
## C-related flags
* `CC`: C compiler
* `CFLAGS`: flags for `CC`
* `LDFLAGS`: flags for the linker
## Text functions
* `$(var:suffix=replacement)`, syntax sugar for
`$(patsubst %suffix, $replacement, $(var))`
More: <https://www.gnu.org/software/make/manual/html_node/Text-Functions.html>
## Filename functions
<https://www.gnu.org/software/make/manual/html_node/File-Name-Functions.html>
## Recipes
* `@<command>`: don't print command ran
* `-<command>`: don't exit on command failure
## Arguments
* `-B, --always-make`: force to make all targets
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