arm: gcc-8: drivers/pinctrl/mediatek/../core.h:211:21: error: initializer element is not constant (struct group_desc)

[Arnd Bergmann]

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 at linaro.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