[Bug c/50521] -fstrict-volatile-bitfields is not strict

[kikairoya at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50521

--- Comment #10 from Tomohiro Kashiwada <kikairoya at gmail dot com> 2011-10-28 08:13:31 UTC ---
(In reply to comment #9)
> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
> section 7.1.7.5.

Thanks, I see.
On ARM ABI, reading or writing to volatile-bitfields should not cause double
access and regardless of volatileness, access should be aligned as container's
type.

I think that to avoid double access needs treatment of volatile object.