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Date:   Mon, 29 Mar 2021 09:01:36 +0200
From:   Marc Kleine-Budde <mkl@pengutronix.de>
To:     Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc:     Oliver Hartkopp <socketcan@hartkopp.net>,
        Rong Chen <rong.a.chen@intel.com>,
        Patrick Menschel <menschel.p@posteo.de>,
        kernel test robot <lkp@intel.com>, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, linux-can <linux-can@vger.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...
Message-ID: <20210329070136.xbgjqc7fpuku7d2t@pengutronix.de>
References: <202103210435.I0fiBGAC-lkp@intel.com>
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On 23.03.2021 15:00:55, Rasmus Villemoes wrote:
[...]
> So let us guess that it's the ABI choice -mabi=3Dapcs-gnu
>=20
> $ arm-linux-gnueabihf-gcc -O2 -msoft-float -mabi=3Dapcs-gnu -Q
> --help=3Dtarget | grep struct
>   -mstructure-size-boundary=3D            32
>=20
> Bingo. (-msoft-float is also included just as in the real command line
> because gcc barfs otherwise).
>=20
> Now what CONFIG_* knobs are responsible for putting -mabi=3Dapcs-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=3Dapcs-gnu" is used, which leads to the
bigger structure size boundary.

| ifeq ($(CONFIG_AEABI),y)
| CFLAGS_ABI      :=3D-mabi=3Daapcs-linux -mfpu=3Dvfp
| else
| CFLAGS_ABI      :=3D$(call cc-option,-mapcs-32,-mabi=3Dapcs-gnu) $(call c=
c-option,-mno-thumb-interwork,)
| endif

regards,
Marc

--=20
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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