makefile - evanmoran/quick GitHub Wiki
The file make uses to define its build rules.
Variables and Rules:
# Variables use '='. By convention these are ALL_CAPS
MY_VARIABLE=string of characters
# Rules use ':'. Notice one tab indention (spaces don't work)
<targets>: <dependencies>
<command1>
<command2>
...
Automatic variables:
$@ Target full path
$(@D) Target directory
$(@F) Target filename
$< First dependency
$? List of only those dependencies that have changed
$^ List of all dependencies with duplicates removed
$+ List of all dependencies with duplicates kept