On 2016-10-18 09:59:36 +0200, Daniel Glöckner wrote:
> On Tue, Oct 18, 2016 at 09:41:49AM +0200, Vincent Lefevre wrote:
> > AFAIK, both are correct.
>
> It depends on the ABI. The ARM EABI defines those details in
> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042f/IHI0042F_aapcs.pdf
> section 7.1.7. But I don't know if we adhere to those rules when
> compiling for ARM.
"For the purposes of calculating the alignment of the aggregate the
type of the member shall be the Fundamental Data Type upon which the
bit-field is based.[1]
[1] The intent is to permit the C construct struct {int a:8; char b[7];}
to have size 8 and alignment 4."
Assuming that there are similar requirements for other architectures,
the behavior of GCC now makes sense to me.
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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