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/recursion.html | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 devdocs/gnu_make/recursion.html (limited to 'devdocs/gnu_make/recursion.html') diff --git a/devdocs/gnu_make/recursion.html b/devdocs/gnu_make/recursion.html new file mode 100644 index 00000000..4f7c86a5 --- /dev/null +++ b/devdocs/gnu_make/recursion.html @@ -0,0 +1,32 @@ +

Recursive Use of make

Recursive use of make means using make as a command in a makefile. This technique is useful when you want separate makefiles for various subsystems that compose a larger system. For example, suppose you have a sub-directory subdir which has its own makefile, and you would like the containing directory’s makefile to run make on the sub-directory. You can do it by writing this: 

subsystem:
+        cd subdir && $(MAKE)
+
+

or, equivalently, this (see Summary of Options): 

subsystem:
+        $(MAKE) -C subdir
+
+

You can write recursive make commands just by copying this example, but there are many things to know about how they work and why, and about how the sub-make relates to the top-level make. You may also find it useful to declare targets that invoke recursive make commands as ‘.PHONY’ (for more discussion on when this is useful, see Phony Targets).

For your convenience, when GNU make starts (after it has processed any -C options) it sets the variable CURDIR to the pathname of the current working directory. This value is never touched by make again: in particular note that if you include files from other directories the value of CURDIR does not change. The value has the same precedence it would have if it were set in the makefile (by default, an environment variable CURDIR will not override this value). Note that setting this variable has no impact on the operation of make (it does not cause make to change its working directory, for example).

+ + + + + + + + + + + + + + + +
• MAKE Variable + The special effects of using ‘$(MAKE)’.
• Variables/Recursion + How to communicate variables to a sub-make.
• Options/Recursion + How to communicate options to a sub-make.
• -w Option + How the ‘-w’ or ‘--print-directory’ option helps debug use of recursive make commands.
+

+ 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/Recursion.html +

+
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