target/linux/generic-2.6/patches-2.6.31/004-extra_optimization.patch

   1 --- a/Makefile
   2 +++ b/Makefile
   3 @@ -521,7 +521,7 @@ all: vmlinux
   4  ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
   5  KBUILD_CFLAGS  += -Os
   6  else
   7 -KBUILD_CFLAGS  += -O2
   8 +KBUILD_CFLAGS  += -O2 -fno-reorder-blocks -fno-tree-ch
   9  endif
  10
  11  include $(srctree)/arch/$(SRCARCH)/Makefile
  12 @@ -559,6 +559,9 @@ endif
  13  NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
  14  CHECKFLAGS     += $(NOSTDINC_FLAGS)
  15
  16 +# improve gcc optimization
  17 +CFLAGS += $(call cc-option,-funit-at-a-time,)
  18 +
  19  # warn about C99 declaration after statement
  20  KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
  21