From e526873c5277ad28f7efb24d949240f07a95dd43 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Wed, 17 May 2023 17:13:51 +0200
Subject: make: add comment about cmdline args

---
 src/development/make.md | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'src/development/make.md')

diff --git a/src/development/make.md b/src/development/make.md
index dcc9fe6..1ebe98e 100644
--- a/src/development/make.md
+++ b/src/development/make.md
@@ -54,7 +54,7 @@ bbb:
 ```
 
 Running above `Makefile` gives:
-```test
+```text
 @ = foobar
 < = aaa
 ^ = aaa bbb
@@ -72,6 +72,25 @@ Running above `Makefile` gives:
 Variables related to filesystem paths:
 - `$(CURDIR)`: Path of current working dir after using `make -C path`
 
+## Arguments
+
+Arguments specified on the command line *override* ordinary variable
+assignments in the makefile ([overriding variables][make-var-override]).
+
+```make
+VAR = abc
+all:
+	@echo VAR=$(VAR)
+```
+
+```text
+# make
+VAR=abc
+
+# make VAR=123
+VAR=123
+```
+
 ## Useful functions
 
 ### Substitution references
@@ -108,3 +127,5 @@ Resolve each file name as canonical path.
 ```make
 $(realpath fname1 fname2 ..)
 ```
+
+[make-var-override]: https://www.gnu.org/software/make/manual/html_node/Overriding.html
-- 
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