Hi experts,

lyang001@lyang0-9010:~/kvm_32/layers/oe-core$ git blame -c
meta/conf/bitbake.conf
9cb71137 meta/conf/bitbake.conf         (Khem Raj
2011-03-17 16:54:30 -0700 524) FULL_OPTIMIZATION = "-O2 -pipe
${DEBUG_FLAGS}"

lyang001@lyang0-9010:~/kvm_32/layers/oe-core$ git show 9cb71137
commit 9cb7113790d716a4c5cf7d511535ba87fdecd1ac
Author: Khem Raj <raj.k...@gmail.com>
Date:   Thu Mar 17 16:54:30 2011 -0700
.................................."
 ##################################################################
 # Optimization flags.
 ##################################################################
-
-FULL_OPTIMIZATION = "-fexpensive-optimizations -fomit-frame-pointer
-frename-registers -O2 -ggdb -feliminate-unused-debug-types"
-DEBUG_OPTIMIZATION = "-O -fno-omit-frame-pointer -g"
+DEBUG_FLAGS ?= "-g -feliminate-unused-debug-types -feliminate-dwarf2-dups"
+FULL_OPTIMIZATION = "-O2 -pipe ${DEBUG_FLAGS}"
+DEBUG_OPTIMIZATION = "-O -fno-omit-frame-pointer ${DEBUG_FLAGS} -pipe"
 SELECTED_OPTIMIZATION = "${@bb.data.getVar(['FULL_OPTIMIZATION',
'DEBUG_OPTIMIZATION'][bb.data.getVar('DEBUG_BUILD', d, 1) == '1'], d,
1)}"
-BUILD_OPTIMIZATION = "-O2"
+BUILD_OPTIMIZATION = "-O2 -pipe"



git blame tells me 9cb71137  ever change it .but it doesn't all the
commit that change it ever, an help

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