error linking lto1 for target avr

[Wim Lewis]

FWIW, I ran into this error today as well. I did some brief bisection
to try to narrow down the source; it looks like it broke in r181378:

181736 - undefined reference to c_addr_space_name
181523 - undefined reference to c_addr_space_name
181440 - undefined reference to c_addr_space_name
181395 - undefined reference to c_addr_space_name
181383 - undefined reference to c_addr_space_name
181378 - undefined reference to c_addr_space_name
181377 - compiles
181375 - compiles

I'm configuring with --disable-libquadmath --disable-nls --target=avr --program-prefix=avr- --enable-languages=c,lto .

-- 
   Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1