[Bug target/54641] Wrong warning flags for building avr-c.o, fails to build

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54641

--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-09-20 20:03:29 UTC ---
> Wrong warning flags for building avr-c.o

Looks like fallout from
http://gcc.gnu.org/viewcvs?view=revision&revision=190439 that changed the
compiler without adjusting the flags?