[Xen-devel] Failing to build qemu-xen (in dev-mtp.c) with GCC9

[Dario Faggioli <dfaggioli@xxxxxxxx>]

Hey,

openSUSE Tumbleweed has: gcc version 9.1.1 20190703

And this fails to build QEMU, like this:

  CC      hw/watchdog/wdt_ib700.o
/build/tools/qemu-xen-dir/hw/usb/dev-mtp.c: In function 
‘usb_mtp_write_metadata’:
/build/tools/qemu-xen-dir/hw/usb/dev-mtp.c:1715:36: error: taking address of 
packed member of ‘struct <anonymous>’ may result in an unaligned pointer value 
[-Werror=address-of-packed-member]
 1715 |                             dataset->filename);
      |                             ~~~~~~~^~~~~~~~~~

This seems to be fixed, for me, if I apply upstream patch 1259f27ec2
("usb-mtp: fix alignment of access of ObjectInfo filename field").

Regards
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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