ARM compiler misbehaves ?

[Grant Edwards]

> >test_struct.test_short = 0x1234;
> >printf("%04x\n", test_struct.test_short);
> >
> >_may_ work.  I don't think it's guaranteed to work, though.
> 
> Actually, I'm pretty sure it is guaranteed to work as long as the 
> compiler can see the "packed" attribute during compilation

I believe you're right.  It's only when you use the "&"
operator to hide the actual structure from the compiler that
things go wrong.

> If you aren't sure we're right, take out the "packed" attribute and try 
> again.  It should work fine then.  Also, stop the debugger after the 
> assignment to test_pointer and examine its value: it should be 16-bit 
> aligned.

IIRC, on an ARM7, it will store one byte in the "wrong" place
and leave the other byte alone.

-- 
Grant Edwards
grante@visi.com

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