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-rw-r--r--rules.mk10
1 files changed, 4 insertions, 6 deletions
diff --git a/rules.mk b/rules.mk
index 14ff5acdf2..d36c994953 100644
--- a/rules.mk
+++ b/rules.mk
@@ -138,12 +138,10 @@ $(call shvar,$(1))=$$(call $(1))
export $(call shvar,$(1))
endef
-define confvar
-$(1):=$$(strip $$($(1)))_
-$(foreach v,$(2),
- $(1):=$$(strip $$($(1)))$(if $($(v)),y,n)
-)
-endef
+empty:=
+space:= $(empty) $(empty)
+merge=$(subst $(space),,$(1))
+confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
# file extension
ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))