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From:   Arvind Sankar <nivedita@alum.mit.edu>
Date:   Thu, 6 Feb 2020 18:33:26 -0500
To:     Arvind Sankar <nivedita@alum.mit.edu>
Cc:     Larry Finger <Larry.Finger@lwfinger.net>,
        Ville =?utf-8?B?U3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
        Tom Anderson <thomasanderson@google.com>,
        Hans Verkuil <hansverk@cisco.com>,
        Manasi Navare <manasi.d.navare@intel.com>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: Error building v5.5-git on PowerPC32 - bisected to commit
 7befe621ff81
Message-ID: <20200206233325.GA3036478@rani.riverdale.lan>
References: <0fb64c98-57c2-b988-051c-6ba0e460ad37@lwfinger.net>
 <20200206231211.GA2976063@rani.riverdale.lan>
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On Thu, Feb 06, 2020 at 06:12:13PM -0500, Arvind Sankar wrote:
> On Thu, Feb 06, 2020 at 04:46:52PM -0600, Larry Finger wrote:
> > When building post V5.5 on my PowerBook G4 Aluminum, the build failed with the 
> > following error:
> 
> It's not that the attributes are wrong. The problem is that BUILD_BUG_ON
> requires a compile-time evaluatable condition. gcc-4.6 is apparently not
> good enough at optimizing to reduce that expression to a constant,
> though it was able to do it with the array accesses.

Should have noted, it fails on x86 too with gcc-4.6.4, not specific to PPC.