linux-kernel - Re: linux-next: build failure after merge of the akpm-current tree

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Date:	Fri, 06 May 2016 16:55:12 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: linux-next: build failure after merge of the akpm-current tree

On Fri, 2016-05-06 at 16:09 +1000, Stephen Rothwell wrote:
> Hi Andrew,
> 
> On Thu, 5 May 2016 22:44:29 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
> > 
> > On Fri, 6 May 2016 14:58:10 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > 
> > > After merging the akpm-current tree, today's linux-next build (and a
> > > few earlier ones) (powerpc allnoconfig (and many others)) failed like
> > > this:
> > > 
> > > lib/vsprintf.c:160:2: error: initializer element is not constant
> > > lib/vsprintf.c:160:2: error: (near initialization for 'decpair[0]')
> > > lib/vsprintf.c:160:2: error: initializer element is not constant
> > > lib/vsprintf.c:160:2: error: (near initialization for 'decpair[1]')
> > > lib/vsprintf.c:160:2: error: initializer element is not constant
> > > lib/vsprintf.c:160:2: error: (near initialization for 'decpair[2]')
> > > lib/vsprintf.c:160:2: error: initializer element is not constant
> > > lib/vsprintf.c:160:2: error: (near initialization for 'decpair[3]')
> > > lib/vsprintf.c:160:2: error: initializer element is not constant
> > > 
> > > and more ... basically any big endian build of code using __swabxx
> > > or cpu_to_lexx in initailisers (in the above case cpu_to_le16()).
> > > 
> > > Caused (presumably) by commit
> > > 
> > >   eeee46ed3cda ("byteswap: try to avoid __builtin_constant_p gcc bug")
> > > 
> > > This is a buyild using gcc 4.6.3.
> > > 
> > > I have revreted that commit for today to see if it fixes the overnight
> > > builds.  
> > 
> > hm, it works for me.  powerpc allnoconfig, after setting CONFIG_PPC64=y.
> 
> Interesting ...  mine also works with gcc 5.2.0. I do 32 and 64 bit
> allnoconfig powerpc builds before I release linux-next and they work,
> but the 32 bit one fails overnight when gcc 4.6.3 is used :-( (we don't
> do a 64 bit allnoconfig overnight as it requires playing with the
> generated .config).  Basically all the powerpc builds were failing with
> gcc 4.6.3 since next-20160502.

There's a powerpc-5.3 compiler in kisskb now, I've been testing it for a while
and it seems OK, you can start using that as well of or instead if you like for
linux-next builds.

cheers