Hello Go-Nuts,

A few months ago I asked about adding a new struct type to syscall. 
(https://groups.google.com/d/msg/golang-nuts/5HTN3QVC_lQ/QuYxNl5UAgAJ) and 
I got a great answer from Ian Lance Taylor that it would make sense to use 
the x/sys/unix library for my implementation.

This worked great, I made a small change to syscall_linux.go 
(https://github.com/elliotmr/cantest/blob/master/unix.diff) and was able to 
regenerate zerrors_linux_amd64.go, zsysnum_linux_amd64.go, and 
ztypes_linux_amd64.go using mkall.sh. Actually, the generated files have 
many more differences than what I would expect just from my code changes, 
but everything seems to work.

Now however, I want to use this on an arm processor and I am having 
trouble.  If I try to run GOOS=linux GOARCH=arm ./mkall.sh from my build 
host (amd64) is crashes because my gcc doesn't have the -marm flag.  If I 
try passing my cross-toolchain using $CC I get some missing header errors.  
Eventually I was able to get it to regenerate the files using qemu and this 
image: https://people.debian.org/~aurel32/qemu/armhf/.  The ztypes file 
looks good (though once again there are extra entries generated that seem 
to have nothing to do with my patch).  But zsysnum is completely empty.

Basically the question is this:  What is the correct way to generate the 
x/sys/unix files, both for a given host environments and also for others?  

Regards,
Elliot

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