bug#45716: Bug in ‘network-interface-names’ when building guix for aarch64 on x86_64.

[Stefan]

Hi Danny and Ludo’!

> Can you try printing (@@ (guix build syscalls) ifreq-struct-size) directly?

I did that, it's printing 40 in both cases. That’s the value which is ending up 
in stride.

> Is it qemu-user or qemu-system?

~$ /usr/local/bin/qemu-system-x86_64 --version
QEMU emulator version 2.12.1 (-dirty)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

> (Note: Empirically, on armhf, that struct is 32 Bytes big in C.
> And indeed the Linux kernel contains a compat struct ifreq32 in 
> fs/compat_ioctl.c)



Bye

Stefan