On 30/09/2024 15:49, David Binderman wrote:
> Hello there,
>
> I just tried to build linux-6.12-rc1 with clang. It said:
>
> drivers/iio/imu/bmi323/bmi323_core.c:133:27: warning: variable 'bmi323_ext_reg_savestate' is not needed and will not be emitted [-Wunneeded-internal-declaration]
>
> A grep for the identifier shows the following strange results::
>
> inux-6.12-rc1 $ grep bmi323_ext_reg_savestate drivers/iio/imu/bmi323/bmi323_core.c
> static const unsigned int bmi323_ext_reg_savestate[] = {
> unsigned int ext_reg_settings[ARRAY_SIZE(bmi323_ext_reg_savestate)];
> for (unsigned int i = 0; i < ARRAY_SIZE(bmi323_ext_reg_savestate); i++) {
> for (unsigned int i = 0; i < ARRAY_SIZE(bmi323_ext_reg_savestate); i++) {
> linux-6.12-rc1 $
>
> I see no mention of bmi323_ext_reg_savestate[ i]. Is there a possible
> cut'n'paste error in one of the two for loops ?
>
> Regards
>
> David Binderman
I think that is a bug in clang:
https://bugs.llvm.org/show_bug.cgi?id=33068
That happens because clang sees that bmi323_ext_reg_savestate is not
used but to gets its size, and that means for it that the variable is
not needed. That does not happen for example with
bmi323_ext_reg_savestate (right above bmi323_ext_reg_savestate) because
that one is used beyond ARRAY_SIZE.
Safe to ignore?
Best regards,
Javier Carrasco
