Hi,

on ARM the GCC has an option for the structure size boundary:

http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#ARM-Options

In the GCC sources (gcc/config/arm) you see that NetBSD changes the default
value to 8 from 32.

For FreeBSD I did not found something similar.  What value is used on FreeBSD
by default?

This value is (or was) important for the network stack.  Do you know if the
current FreeBSD network stack is dependent on this value?  In the file
gcc/config/arm/netbsd.h (GCC sources) is a comment about this topic.

Have a nice day!

-- 
Sebastian Huber, embedded brains GmbH

Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
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