Re: [5.15-rc1][PPC][bisected 6d2ef226] mainline build breaks at ./include/linux/compiler_attributes.h:62:5: warning: "__has_attribute"

[Nick Desaulniers]

On Mon, Sep 13, 2021 at 11:22 PM Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> Hi Abdul,
>
> On Tue, 14 Sep 2021 11:39:44 +0530 Abdul Haleem <abdhalee@xxxxxxxxxxxxxxxxxx> wrote:
> >
> > Today's mainline kernel fails to compile on my powerpc box with below errors
> >
> > ././include/linux/compiler_attributes.h:62:5: warning: "__has_attribute" is not defined, evaluates to 0 [-Wundef]
> >   #if __has_attribute(__assume_aligned__)
> >       ^~~~~~~~~~~~~~~
> > ././include/linux/compiler_attributes.h:62:20: error: missing binary operator before token "("
> >   #if __has_attribute(__assume_aligned__)
> >                      ^
> > ././include/linux/compiler_attributes.h:88:5: warning: "__has_attribute" is not defined, evaluates to 0 [-Wundef]
> >   #if __has_attribute(__copy__)
> >       ^~~~~~~~~~~~~~~
> > ././include/linux/compiler_attributes.h:88:20: error: missing binary operator before token "("
> >   #if __has_attribute(__copy__)
> >
> > Kernel builds fine when below patch is reverted
> >
> > commit 6d2ef22 : compiler_attributes.h: drop __has_attribute() support for gcc4
>
> Thanks for your report.
>
> This is known and being addressed.

Thanks for the report. Support for GCC 4.X has been dropped.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76ae847497bc5207c479de5e2ac487270008b19b
-- 
Thanks,
~Nick Desaulniers