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-rw-r--r--rules.mk12
1 files changed, 12 insertions, 0 deletions
diff --git a/rules.mk b/rules.mk
index 49044c8cfb..7d3516bc42 100644
--- a/rules.mk
+++ b/rules.mk
@@ -254,4 +254,16 @@ all:
FORCE: ;
.PHONY: FORCE
+val.%:
+ @$(if $(filter undefined,$(origin $*)),\
+ echo "$* undefined" >&2, \
+ echo '$(subst ','"'"',$($*))' \
+ )
+
+var.%:
+ @$(if $(filter undefined,$(origin $*)),\
+ echo "$* undefined" >&2, \
+ echo "$*='"'$(subst ','"'\"'\"'"',$($*))'"'" \
+ )
+
endif #__rules_inc