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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>
This commit is contained in:
Quentin Schulz 2022-08-02 14:35:59 +02:00 committed by Yann E. MORIN
parent 83f71e7ceb
commit ec82347cde
1 changed files with 4 additions and 0 deletions
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4
Makefile
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@ -1058,6 +1058,10 @@ 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)))), \