commit 01efddb0b8c641a9ebfd955173dd58e015fbe903
author Jeff Brown <jeffbrown@google.com> Wed May 30 13:52:22 2012 -0700
committer Jeff Brown <jeffbrown@google.com> Wed May 30 13:52:22 2012 -0700
tree 6b6a8caf0bbc6e18d1dff379deb1c7f9917c922a
parent 3e93aeae10aa70ab64e78fbab0bb8741d0b04d99

Make make make faster.

Optimize common case of uniq-words where the word is not
actually duplicated.  Reduces make startup overhead.

Change-Id: I1bee13bbd08a7b01248f4452283a64a724663d02

core/node_fns.mk

diff --git a/core/node_fns.mk b/core/node_fns.mk
index 38ecea7..40abff7 100644
--- a/core/node_fns.mk
+++ b/core/node_fns.mk
@@ -98,7 +98,7 @@
 space := $(empty) $(empty)
 define uniq-word
 $(strip \
-  $(if $(filter $(2),$(1)), \
+  $(if $(filter-out 0 1,$(words $(filter $(2),$(1)))), \
     $(eval h := |||$(subst $(space),|||,$(strip $(1)))|||) \
     $(eval h := $(subst |||$(strip $(2))|||,|||$(space)|||,$(h))) \
     $(eval h := $(word 1,$(h)) $(2) $(wordlist 2,9999,$(h))) \