questions about objcopy and ld

[Nick Clifton]

Hi Ali,

> Does objcopy adds a final 0 to the outfile? I use it, it seems that
> one byte is extra.

No.  At least I do not see why it would.  Do you have a specific example 
that we could look at ?

> When we create some sections by ld, does the size of these sections
> have to be a multiple of a number?

It depends upon the section type and the target, but in general the 
answer is yes.

> (some sort of alignment) and what is that number?

The alignment.  The specific value for alignments varies with different 
sections and different targets.  When the linker creates an output 
section it sets its alignment to largest alignment value of any of the 
input section whose contents are being mapped into that output section.

Cheers
   Nick