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From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Tue, 14 Sep 2021 08:06:22 -0700
Message-ID: <CAKwvOdmHH-tOkCPGX-Si7gSujKj-CV3O5UjZD7BNtsTKwMmkeA@mail.gmail.com>
Subject: Re: [5.15-rc1][PPC][bisected 6d2ef226] mainline build breaks at
 ./include/linux/compiler_attributes.h:62:5: warning: "__has_attribute"
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Abdul Haleem <abdhalee@linux.vnet.ibm.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        linux-next <linux-next@vger.kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        sachinp <sachinp@linux.vnet.ibm.com>, ojeda@kernel.org
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On Mon, Sep 13, 2021 at 11:22 PM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> Hi Abdul,
>
> On Tue, 14 Sep 2021 11:39:44 +0530 Abdul Haleem <abdhalee@linux.vnet.ibm.com> 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