As avr-libc-devel wrote:

> >Seems like a strange compiler build.
> In my opinion, the problem at the link stage: the object file after
> compilation looks OK

Yes, but the linker is driven by the compiler.

> 2.$ avr-gcc blink.o -v -o blink.elf

Your linker call is missing the -mmcu option.

That's why no startup code has been scheduled to link against.
-- 
cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)

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