Re: How can I get this data into the .data section of the binary?

[Niklas Holsti <niklas.holsti@tidorum.invalid>]

On 2020-06-17 15:37, Luke A. Guest wrote:
> On 16/06/2020 19:19, Tero Koskinen wrote:
>> Hi,
>>
>> I haven't tried with your example, but is GNAT specific pragma
>> Linker_Section acceptable?
> 
> I can't really see how it would be as it would still require the
> compiler to actually generate the correct value in .data or .rodata
> space rather than a 0x0 which gets filled in later by elaboration.
> 
> Interesting though.
> 
> I wrote the above before trying. Trying to place it in ".rodata..."
> caused a compiler error, placing it in .data worked, but there is still
> elaboration code. 

The compiler error probably resulted from the compiler generating 
elaboration code to write something into the read-only ".rodata", right?

I once tried to put a static constant (a program-version string) into 
".rodata" with pragma Linker_Section, and had no success -- it seemed to 
me that (the version I had of) the GNU linker was doing some magic with 
".rodata" that was not expressed in the linker command script.

I changed to use another section name (something of my own invention, 
perhaps ".version" or whatever) and it worked right away. Of course I 
also had to update the linker command script to place that section 
somewhere.

(My object in that case was just a static string, so GNAT produced no 
elaboration code, so no help for the original problem.)

-- 
Niklas Holsti
niklas holsti tidorum fi
       .      @       .