On 23.10.11 14:01, Georg-Johann Lay wrote:
{ Beautifully documented investigation results snipped }
> and the application be linked with -Wl,-defsym=func_4=0x4
>
> ==
>
> Text like above should be added to GCC's documentation.
>
> If there is something missing, incorrect or bad style, please suggest.
>
> In my understanding, caveats are no problem. But problems will arise
> if caveats are not documented and one is not aware of them.
Many thanks for illuminating the murk for us all. Now we have no excuse
for being unaware. A little bit of linker script tweaking if we need to
be adventurous with EIND, is no obstacle at all.
There's benefit in defining absolute addresses, such as the func_4 example,
in the linker script, I think [1]. If jump tables or other such addressing
constructs needed to be customised prior to linking (e.g. by a script
handling multiple builds) then it's often convenient to do that in a
separate file, and INCLUDE it in the main linker script, at the
appropriate place.
Thanks again for making it so clear.
Erik
[1] So that the linker script documents the product's memory map, and
fixed addresses need not be hunted in makefiles and source code.
--
manual, n.:
A unit of documentation. There are always three or more on a given item.
One is on the shelf; someone has the others.
The information you need is in the others. - Ray Simard
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