[ECOS] pragma pack

Paul D. DeRocco pderocco@ix.netcom.com
Wed Jan 9 22:22:00 GMT 2008


> From: Bronislav Gabrhelik
> 
> Beware of bad alignment of timestamp field. Some processors 
> might raise an exception/interrupt when you use the int like 
> operation directly on field (including assignment & 
> evaluation). You should copy out/in this by memcpy into/from 
> temporary variable of the same type when you need to do some 
> integer computing on this field. In other case your code 
> might not be portable.

I think that's the point of the __packed__ attribute: it forces the compiler
for any machine on which it matters to do the necessary byte
packing/unpacking automagically. I know that's what the Gnu ARM compiler
does.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com 


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