Re: Warning from avr-gcc

[Bob von Knobloch]

On 23/02/2021 02:31, Matt wrote:
> I wish I had the answer.
>
> If you have files that compiled before (simple)..  You might try 
> corrupting them in a small way..  Do a recompile on the copied file..  
> Or, if you are making your program from modules, kick one out to isolate 
> what is causing the failure.
>
> At a loss..  I'm not working with that stuff yet (too many computer 
> crashes)!
>
> ---
> matt
> (408) 638 - 0273
>
>
> On 2021-02-22 21:12, Bob von Knobloch wrote:
>
> > Hi,
> > it's just a warning, but could someone explain what:
> >
> > "/usr/lib64/gcc/avr/7/ld: warning: -z relro ignored"
> >
> > is trying to tell me. It appeared with a newer compiler version.
> >
> > Thanks,
> >
> > Bob
OK, it it a feature to make relocated code read-only under certain 
circumstances (does not apply to my AVR Mega1284). It seems to be built 
into the avr-ld linker program.

issuing "avr-ld" gives:
avr-ld: warning: -z relro ignored
avr-ld: no input files
So the linker seems to have this default.

I suspected it because an old program compiled with avr-gcc 4.9.2 does 
not run when compiled with version 7.4.0, although it compiles without 
error. I will have to dig deeper.

Cheers,
Bob
--
The Sun is out, the sky is blue, it's time to drive the MR2.