kernel: add support for 3.9-rc2
Signed-off-by: Florian Fainelli <florian@openwrt.org> SVN-Revision: 36008
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		@@ -0,0 +1,24 @@
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--- a/Makefile
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+++ b/Makefile
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@@ -570,9 +570,9 @@ endif # $(dot-config)
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 all: vmlinux
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 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
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-KBUILD_CFLAGS	+= -Os
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+KBUILD_CFLAGS	+= -Os -fno-caller-saves
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 else
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-KBUILD_CFLAGS	+= -O2
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+KBUILD_CFLAGS	+= -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
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 endif
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 include $(srctree)/arch/$(SRCARCH)/Makefile
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@@ -646,6 +646,9 @@ endif
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 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
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 CHECKFLAGS     += $(NOSTDINC_FLAGS)
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+# improve gcc optimization
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+CFLAGS += $(call cc-option,-funit-at-a-time,)
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+
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 # warn about C99 declaration after statement
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 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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