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authorPeter Korsgaard <jacmet@sunsite.dk>2010-05-06 18:46:49 (GMT)
committer Peter Korsgaard <jacmet@sunsite.dk>2010-05-06 18:56:18 (GMT)
commit4efdd9f3d949576392d0f0a7ed06e41b125916c5 (patch)
tree4060da4f25bac7965b997efd39126ad8254e686b
parentd701a82321ad2f3e5bfa16639e93532294cad4ce (diff)
downloadbuildroot-4efdd9f3d949576392d0f0a7ed06e41b125916c5.tar.gz
buildroot-4efdd9f3d949576392d0f0a7ed06e41b125916c5.tar.bz2
Makefile.package.in: optimize UPPERCASE macro
As noticed by Thomas, we call the UPPERCASE macro a lot, and it slows down startup quite a bit. Optimize it by implementing it in make, rather than forking a shell + tr. The implementation is heavily based on the 'up' macro from gmsl (http://gmsl.sf.net) With this in place, startup time is ~5 times lower. Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
-rw-r--r--package/Makefile.package.in16
1 files changed, 15 insertions, 1 deletions
diff --git a/package/Makefile.package.in b/package/Makefile.package.in
index e98fda8..c2f86c7 100644
--- a/package/Makefile.package.in
+++ b/package/Makefile.package.in
@@ -24,7 +24,21 @@
# UPPERCASE Macro -- transform its argument to uppercase and replace dots and
# hyphens to underscores
-UPPERCASE = $(shell echo $(1) | tr "a-z.-" "A-Z__")
+
+# Heavily inspired by the up macro from gmsl (http://gmsl.sf.net)
+# This is approx 5 times faster than forking a shell and tr, and
+# as this macro is used a lot it matters
+# This works by creating translation character pairs (E.G. a:A b:B)
+# and then looping though all of them running $(subst from,to,text)
+[FROM] := a b c d e f g h i j k l m n o p q r s t u v w x y z . -
+[TO] := A B C D E F G H I J K L M N O P Q R S T U V W X Y Z _ _
+
+UPPERCASE = $(strip $(eval __tmp := $1) \
+ $(foreach c, $(join $(addsuffix :,$([FROM])),$([TO])), \
+ $(eval __tmp := \
+ $(subst $(word 1,$(subst :, ,$c)),$(word 2,$(subst :, ,$c)),\
+ $(__tmp)))) \
+ $(__tmp))
# Define extrators for different archive suffixes
INFLATE.bz2 = $(BZCAT)