linux-kernel - Re: arm: gcc-8: drivers/pinctrl/mediatek/../core.h:211:21: error: initializer element is not constant (struct group

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Date:   Mon, 04 Dec 2023 16:11:11 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Naresh Kamboju" <naresh.kamboju@...aro.org>,
        "Linux ARM" <linux-arm-kernel@...ts.infradead.org>,
        "open list" <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        "Linux Regressions" <regressions@...ts.linux.dev>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>
Cc:     "Linus Walleij" <linus.walleij@...aro.org>, sean.wang@...nel.org,
        "Russell King" <linux@...linux.org.uk>
Subject: Re: arm: gcc-8: drivers/pinctrl/mediatek/../core.h:211:21: error: initializer
 element is not constant (struct group_desc)

On Mon, Dec 4, 2023, at 13:08, Naresh Kamboju wrote:
> Following build errors noticed on Linux next-20231204 tag with gcc-8 toolchain
> for arm and arm64.
>
> ## Test Regressions (compared to next-20231201)
> * arm, build
>   - gcc-8-defconfig
>
> * arm64, build
>   - gcc-8-defconfig
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
> Build log arm and arm64:
> ------------
> In file included from drivers/pinctrl/mediatek/pinctrl-moore.h:21,
>                  from drivers/pinctrl/mediatek/pinctrl-mt7623.c:11:
> drivers/pinctrl/mediatek/../core.h:211:21: error: initializer element
> is not constant
>  (struct group_desc) {      \


This apparently comes from c0c8dd0a7773 ("pinctrl: core: Add a
convenient define PINCTRL_GROUP_DESC()") and following patches
from Andy Shevchenko (added to Cc).

I also checked different compiler versions and found that the
new code works fine with gcc-13.2.0, but not with gcc-12 or
older.

      Arnd