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Date:   Tue, 14 Sep 2021 16:22:23 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc:     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>, ndesaulniers@google.com,
        ojeda@kernel.org
Subject: Re: [5.15-rc1][PPC][bisected 6d2ef226] mainline build breaks at
 ./include/linux/compiler_attributes.h:62:5: warning: "__has_attribute"
Message-ID: <20210914162223.363dd7c2@canb.auug.org.au>
In-Reply-To: <50a91600-173f-ae8f-e194-4649a9f8176b@linux.vnet.ibm.com>
References: <50a91600-173f-ae8f-e194-4649a9f8176b@linux.vnet.ibm.com>
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Hi Abdul,

On Tue, 14 Sep 2021 11:39:44 +0530 Abdul Haleem <abdhalee@linux.vnet.ibm.co=
m> wrote:
>
> Today's mainline kernel fails to compile on my powerpc box with below err=
ors
>=20
> ././include/linux/compiler_attributes.h:62:5: warning: "__has_attribute" =
is not defined, evaluates to 0 [-Wundef]
>  =C2=A0#if __has_attribute(__assume_aligned__)
>  =C2=A0=C2=A0=C2=A0=C2=A0 ^~~~~~~~~~~~~~~
> ././include/linux/compiler_attributes.h:62:20: error: missing binary oper=
ator before token "("
>  =C2=A0#if __has_attribute(__assume_aligned__)
>  =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^
> ././include/linux/compiler_attributes.h:88:5: warning: "__has_attribute" =
is not defined, evaluates to 0 [-Wundef]
>  =C2=A0#if __has_attribute(__copy__)
>  =C2=A0=C2=A0=C2=A0=C2=A0 ^~~~~~~~~~~~~~~
> ././include/linux/compiler_attributes.h:88:20: error: missing binary oper=
ator before token "("
>  =C2=A0#if __has_attribute(__copy__)
>=20
> Kernel builds fine when below patch is reverted
>=20
> commit 6d2ef22 : compiler_attributes.h: drop __has_attribute() support fo=
r gcc4

Thanks for your report.

This is known and being addressed.

--=20
Cheers,
Stephen Rothwell

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