Description of problem:
Some packages include <linux/ipv6.h> which eventually includes
<asm/gcc_intrin.h> which fails to build on ia64 outside of the kernel.  There
are likely other paths where gcc_intrin.h is included as well but this is the
one I am running into (when building the dhcpv6 package on ia64).

The failure can most easily be reporoduced with a 1 liner c program that does
nothing but:

#include <linux/ipv6.h>

when compiling this it fails with:

# cc foo.c
In file included from /usr/include/asm/intrinsics.h:18,
                 from /usr/include/asm/byteorder.h:10,
                 from /usr/include/linux/ipv6.h:5,
                 from foo.c:3:
/usr/include/asm/gcc_intrin.h:26: error: expected ‘,’ or ‘;’ before
‘__attribute_used__’

The problem is __attribute_used__ is defined in linux/compiler-gcc3.h and
compiler-gcc4.h neither of which are packaged with the userspace kernel-headers
package.

I did some digging and it appears this patch was included in -mm:

http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc1/2.6.18-rc1-mm2/broken-out/git-hdrcleanup-vs-git-klibc-on-ia64.patch

I am guessing this was never pulled into the upstream kernel because technically
the kernel is not broken since it has all the needed .h files and
__attribute_used__ is defined.  It is just when we pull those out of the
usperspace that the problem is introduced.




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