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| author | Johannes Stoelp <johannes.stoelp@gmail.com> | 2023-05-17 17:13:51 +0200 |
|---|---|---|
| committer | Johannes Stoelp <johannes.stoelp@gmail.com> | 2023-05-17 17:13:51 +0200 |
| commit | e526873c5277ad28f7efb24d949240f07a95dd43 (patch) | |
| tree | 6a173606e68d2094614a04a96f141d6f807e6f01 | |
| parent | a3c6de1d257ce0b58d4c0386d8044f0673b68c91 (diff) | |
| download | notes-e526873c5277ad28f7efb24d949240f07a95dd43.tar.gz notes-e526873c5277ad28f7efb24d949240f07a95dd43.zip | |
make: add comment about cmdline args
| -rw-r--r-- | src/development/make.md | 23 |
1 files changed, 22 insertions, 1 deletions
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 |