Re: [avr-gcc-list] avr-libc-1.7.0 fails to compile

[Georg Lay]

Joerg Wunsch schrieb:
> As Georg Lay wrote:
> 
>> Thanks, that works. Now using 3.81 instead of 3.80.
> 
> Yes, Dmitry introduced some pattern derivations that require 3.81.
> 
>> One more question: How does avr-libs determine if a specific target is
>> supported or not?
> 
> See configure.ac: it tries to test-compile a minimal piece of code,
> and relies on GCC's exit code to see whether the respective -mmcu
> option value is acceptable or not.  GCC currently has a bug in that it
> doesn't correctly report an error status if the -mmcu option value is
> not actually supported (GCC bug #45261); instead, it relies on the
> assembler to fail.  So if your binutils support a device the compiler
> doesn't support, the decision will be wrong.

Ok, that's fine for me. Just want to understand where the hiccups are
and exclude something had been overseen. Thanks for the explanation.
Just ignore my post from 1 minute ago or so.

Georg