[Makefile] Passing additional variables from command line to make
The simplest way is:
make foo=bar target
Then in your makefile you can refer to
$(foo). Note that this won't propagate to sub-makes automatically.
If you are using sub-makes, see this article: Communicating Variables to a Sub-make
Can I pass variables to a GNU Makefile as command line arguments? In other words, I want to pass some arguments which will eventually become variables in the Makefile.
From the manual:
Variables in make can come from the environment in which make is run. Every environment variable that make sees when it starts up is transformed into a make variable with the same name and value. However, an explicit assignment in the makefile, or with a command argument, overrides the environment.
So you can do (from bash):
resulting in a variable
FOOBAR in your Makefile.
Then use the variable,
$(ROOT_DIR) in the Makefile.