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