Re: [Qemu-devel] [PATCH] crypto/block: Fix build with gcc 9

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Feb 28, 2019 at 04:06:06PM +0100, Greg Kurz wrote:
> Build fails with gcc 9:
> 
> crypto/block-luks.c:689:18: error: taking address of packed member of ‘struct QCryptoBlockLUKSHeader’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
>   689 |     be32_to_cpus(&luks->header.payload_offset);
>       |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> crypto/block-luks.c:690:18: error: taking address of packed member of ‘struct QCryptoBlockLUKSHeader’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
>   690 |     be32_to_cpus(&luks->header.key_bytes);
>       |                  ^~~~~~~~~~~~~~~~~~~~~~~
> crypto/block-luks.c:691:18: error: taking address of packed member of ‘struct QCryptoBlockLUKSHeader’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
>   691 |     be32_to_cpus(&luks->header.master_key_iterations);
>       |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> ... a bunch of similar errors...
> 
> crypto/block-luks.c:1288:22: error: taking address of packed member of ‘struct QCryptoBlockLUKSKeySlot’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
>  1288 |         be32_to_cpus(&luks->header.key_slots[i].stripes);
>       |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 
> All members of the QCryptoBlockLUKSKeySlot and QCryptoBlockLUKSHeader are
> naturally aligned and we already check at build time there isn't any
> unwanted padding. Drop the QEMU_PACKED attribute.
> 
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
>  crypto/block-luks.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

I'll queue this one.


Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|