From a890b593c617e26935252f90f62b1be35759907f Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Thu, 4 Mar 2021 18:01:45 +0200
Subject: Add makefile notes

---
 doc/makefiles.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 doc/makefiles.md

(limited to 'doc/makefiles.md')

diff --git a/doc/makefiles.md b/doc/makefiles.md
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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)
-- 
cgit v1.2.1