aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/_posts
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--_posts/2020-05-20-makefile-escaping.md52
1 files changed, 5 insertions, 47 deletions
diff --git a/_posts/2020-05-20-makefile-escaping.md b/_posts/2020-05-20-makefile-escaping.md
index 4190fff..7d468dc 100644
--- a/_posts/2020-05-20-makefile-escaping.md
+++ b/_posts/2020-05-20-makefile-escaping.md
@@ -2,6 +2,11 @@
title: Escaping characters in Makefile
excerpt: Making less error-prone.
---
+TL;DR: visit [this page] for a short and concise version of this article.
+{: .alert .alert-success }
+
+[this page]: {{ site.baseurl }}{% link _notes/makefile.md %}
+
I'm a big sucker for irrelevant nitpicks like properly quoting arguments in
shell scripts.
I've also recently started using GNU make as a substitute for one-line shell
@@ -32,53 +37,6 @@ the choice of shell is very relevant.
The Makefiles in this post specify `bash` explicitly using the `SHELL`
variable, but the same rules should apply for all similar `sh`-like shells.
-TL;DR
------
-
-Visit [this page] for an all-in-one Makefile template.
-{: .alert .alert-info }
-
-[this page]: {{ site.baseurl }}{% link _notes/makefile.md %}
-
-* Put the prologue above at the top of your Makefile.
-* Quote command arguments in Makefiles using single quotes `'`.
-* Define a helper function:
-
- escape = $(subst ','\'',$(1))
-
- Instead of:
-
- test:
- echo '$(var)'
-
- do
-
- test:
- echo '$(call escape,$(var))'
-
-* If you use environment variables in your Makefile (or you override variables
-on the command line), add the following lengthy snippet:
-
- define noexpand
- ifeq ($$(origin $(1)),environment)
- $(1) := $$(value $(1))
- endif
- ifeq ($$(origin $(1)),environment override)
- $(1) := $$(value $(1))
- endif
- ifeq ($$(origin $(1)),command line)
- override $(1) := $$(value $(1))
- endif
- endef
-
- Then `eval` the `noexpand` function output for every possibly overridden
-variable or a used environment variable:
-
- has_default ?= Default value
- $(eval $(call noexpand,has_default))
-
- $(eval $(call noexpand,ENV_VAR))
-
Quoting arguments
-----------------