[coreboot] Re: [RFC] #pragma once

[Felix Held]

Hi Martin,
> To support #pragma once, the compiler tries to identify duplicate encounters with the same file, but the check gcc actually performs to establish the identity of the file is weak. Here's someone who made two copies of the same header with different names, each with a #pragma once, and it screwed up his build.

Ouch, that isn't what I expected here; especially since multiple files 
with the same timestamp are expected when doing a fresh repo checkout.
With this info I agree that we should keep the include guard; definitely 
learned something new today. It would be helpful to have this documented 
and possibly have some check to make sure that the include guards aren't 
broken in some files.

Regards,
Felix