Peter Hartley noticed, that in the qemu code the imr_ifindex member of
struct target_ip_mreq needs to be of type "int" instead of "long", which
is what the Linux kernel uses on all architectures.
Adjust the type accordingly, and add a QEMU_BUILD_BUG_ON() checker to
prevent such issues in the future.
This change should fix multicast issues when using hosts and guests with
different endianess or bit size.
Reported-by: Peter Hartley <peter@talesfromthearmchair.net>
Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/2553
Signed-off-by: Helge Deller <deller@gmx.de>
e2af3eadc0