Update of bug #56778 (project make):
Status: None => Not A Bug
Open/Closed: Open => Closed
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Follow-up Comment #1:
Questions like this about how make works are best asked on the mailing lists,
such as bug-make@gnu.org or help-m...@gnu.org, rather than being reported as
bugs in the bug tracker.
This is expected behavior. The details of why this happens are described in
https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html and look
up this error in the section
https://www.gnu.org/software/make/manual/html_node/Error-Messages.html
Basically in Makefile4 you have a rule like this:
all:
$(my_rule)
the string $(my_rule) doesn't have an immediate reference to the $(MAKE)
variable so as far as make is concerned, this recipe does not invoke a
recursive make instance.
To tell make that it _does_ perform a recursive make instance, and thus avoid
the warning, you need to use the special + character. You can either prefix
the variable reference in the recipe, like this:
all:
+$(my_rule)
Or include it inside the define like this:
define my_rule
+$(MAKE) -f $(lastword $(MAKEFILE_LIST)) SUB-MAKE=1 hello
endef
(note the TAB is not needed here because you already have a TAB before the
recipe where the $(my_rule) variable appears... you can include it or not it
doesn't matter).
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