From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/gnu_make/value-function.html | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 devdocs/gnu_make/value-function.html (limited to 'devdocs/gnu_make/value-function.html') diff --git a/devdocs/gnu_make/value-function.html b/devdocs/gnu_make/value-function.html new file mode 100644 index 00000000..29bc0ed1 --- /dev/null +++ b/devdocs/gnu_make/value-function.html @@ -0,0 +1,14 @@ +

The value Function

The value function provides a way for you to use the value of a variable without having it expanded. Please note that this does not undo expansions which have already occurred; for example if you create a simply expanded variable its value is expanded during the definition; in that case the value function will return the same result as using the variable directly.

The syntax of the value function is: 

$(value variable)
+
+

Note that variable is the name of a variable, not a reference to that variable. Therefore you would not normally use a ‘$’ or parentheses when writing it. (You can, however, use a variable reference in the name if you want the name not to be a constant.)

The result of this function is a string containing the value of variable, without any expansion occurring. For example, in this makefile: 

FOO = $PATH
+
+all:
+        @echo $(FOO)
+        @echo $(value FOO)
+
+

The first output line would be ATH, since the “$P” would be expanded as a make variable, while the second output line would be the current value of your $PATH environment variable, since the value function avoided the expansion.

The value function is most often used in conjunction with the eval function (see Eval Function).

+

+ Copyright © 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Free Software Foundation, Inc.
Licensed under the GNU Free Documentation License.
+ https://www.gnu.org/software/make/manual/html_node/Value-Function.html +

+
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