[Bug target/59396] [avr] Wrong warning with ISR() and -flto

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59396

--- Comment #8 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Martin Nowak from comment #5)
> (In reply to Georg-Johann Lay from comment #4)
> > As the patch above has not been approved, it's unlikely this will ever get
> > fixed...
> 
> This should have a high priority, it makes LTO completely unusable on AVR.

avr itself is an architecture that hat not a high priority in the GCC project,
thus all avr issues are P4 or P5.

And this is just a warning that occurs during the LTO run.  Try to add -w to
the lto1 run, i.e. to your link step.