linux-kernel - Re: [kbuild-all] Re: include/linux/compiler_types.h:315:38: error: call to '__compiletime_assert_536' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len) || offsetof(struct can

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Message-ID: <20210329070136.xbgjqc7fpuku7d2t@pengutronix.de>
Date:   Mon, 29 Mar 2021 09:01:36 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Oliver Hartkopp <socketcan@...tkopp.net>,
        Rong Chen <rong.a.chen@...el.com>,
        Patrick Menschel <menschel.p@...teo.de>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, linux-can <linux-can@...r.kernel.org>
Subject: Re: [kbuild-all] Re: include/linux/compiler_types.h:315:38: error:
 call to '__compiletime_assert_536' declared with attribute error:
 BUILD_BUG_ON failed: offsetof(struct can_frame, len) != offsetof(struct
 canfd_frame, len) || offsetof(struct can_frame, data) != offsetof(struc...

On 23.03.2021 15:00:55, Rasmus Villemoes wrote:
[...]
> So let us guess that it's the ABI choice -mabi=apcs-gnu
> 
> $ arm-linux-gnueabihf-gcc -O2 -msoft-float -mabi=apcs-gnu -Q
> --help=target | grep struct
>   -mstructure-size-boundary=            32
> 
> Bingo. (-msoft-float is also included just as in the real command line
> because gcc barfs otherwise).
> 
> Now what CONFIG_* knobs are responsible for putting -mabi=apcs-gnu in
> CFLAGS is left as an exercise for the reader. Regardless, it is not a
> bug in the compiler. The error is the assumption that this language

For the record:

If CONFIG_AEABI is not set "-mabi=apcs-gnu" is used, which leads to the
bigger structure size boundary.

| ifeq ($(CONFIG_AEABI),y)
| CFLAGS_ABI      :=-mabi=aapcs-linux -mfpu=vfp
| else
| CFLAGS_ABI      :=$(call cc-option,-mapcs-32,-mabi=apcs-gnu) $(call cc-option,-mno-thumb-interwork,)
| endif

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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