Re: [Xen-devel] xen build error on gcc v4.5.0

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Wed, 18 Aug 2010, Jeremy Fitzhardinge wrote:

> On 08/18/2010 03:24 AM, Masroor Vettuparambil wrote:
> > I got the below error when I do a 'make world' in xen-testing.hg . The kernel 
> > is 2.6.31.14. gcc version is 4.5.0.
> > It is working with gcc v4.3.0
> > Btw  I thought the default kernel in xen-testing.hg is 2.6.32.x, but it is 
> > still 2.6.31.x.
> >
> > .............
> >
> >   LD      drivers/xen/blktap/blktap.o
> >   LD      drivers/xen/blktap/built-in.o
> >   CC      drivers/xen/netback/netback.o
> > /home/xen/xen-4.0-testing.hg/linux-2.6-pvops.git/drivers/xen/netback/netback.c: In 
> > function ânet_rx_actionâ:
> > /home/xen/xen-4.0-testing.hg/linux-2.6-pvops.git/drivers/xen/netback/netback.c:495:32: error: 
> > storage size of ârx_mclâ isnât constant
> Looks like a gcc bug.  Older gccs can compute __RING_SIZE() as a
> compile-time constant, but gcc 4.5.0 apparently isn't doing that.  It
> is, admittedly, a very complex expression, but gcc shouldn't regress
> like this.  I'm not sure how to work around it.
One option is to use __CONST_RING_SIZE instead of __RING_SIZE if that is 
available. I had a similar problem compiling xen with gcc 4.5 where this 
worked.
        Michael Young

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