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# How to write makefiles
and useful notes on understanding them
## Manual
[gnu](https://www.gnu.org/software/make/manual/html_node/index.html)
## [Variables](https://www.gnu.org/software/make/manual/html_node/Setting.html)
:= expanded variable, right-hand side can contain variables
?= only set if it doesn't have a value
!= execute a shell script on the right-hand side and assign its result to the left-hand side
## Targets
$@ is target
$< is first dependency
$^ is all dependencies
## Dependencies
Use compiled -MMD switch to create rules (.d files)
Include .d files for targets using -include (include if available)
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