This is used to work around a gcc-4.6's bug about the option.
[YOCTO #1099]
(From OE-Core rev: 909c8ff0f27064fd01853ef92977488e6a097dfe)
Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>