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Makefile: error out printvars target when VARS is empty or unset

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printvars returns nothing when VARS is not passed or empty. This is done
on purpose, see commit fd5bd12379 ("Makefile: printvars: don't print
anything when VARS is not set").

An error message making explicit what is required from the user in order
to use printvars is however better than silently doing nothing.

This adds a check for a non-empty VARS variable.

Cc: Quentin Schulz <foss+buildroot@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit ec82347cde)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Quentin Schulz 2022-08-02 14:35:59 +02:00 committed by Peter Korsgaard
parent a344a5b7cb
commit c47f728a78
1 changed files with 4 additions and 0 deletions
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4
Makefile
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@ -1061,6 +1061,10 @@ endif
# to workaround a bug in make 4.3; see https://savannah.gnu.org/bugs/?59093
.PHONY: printvars
printvars:
ifndef VARS
@echo "Please pass a non-empty VARS to 'make printvars'"
@exit 1
endif
@:
$(foreach V, \
$(sort $(foreach X, $(.VARIABLES), $(filter $(VARS),$(X)))), \