Re: [avr-gcc-list] Illegal opcode errors building gcc-4.2.3

[Rick Mann]

On Apr 20, 2008, at 2:29 PM, Dmitry K. wrote:

> More exactly: this is because binutils 2.18 does not support
> the MOVW instruction with architecture 3.
>
> The simplest workaround (if you are not happy to install new
> binutils) is to add '-mall-opcodes':
>
> Replace into 'config/avr/avr.h' the string:
>    #define ASM_SPEC "%{mmcu=avr25:-mmcu=avr2;
>        mmcu=avr35:-mmcu=avr3;
>        mmcu=avr31:-mmcu=avr3;mmcu=avr51:-mmcu=avr5;mmcu=*:-mmcu=%*}"
> to:
>    #define ASM_SPEC "%{mmcu=avr25:-mmcu=avr2;
>        mmcu=avr35:-mmcu=avr3 -mall-opcodes;
>        mmcu=avr31:-mmcu=avr3;mmcu=avr51:-mmcu=avr5;mmcu=*:-mmcu=%*}"


Thank you for the suggestion.

Would you mind giving me a little lesson in how that ASM_SPEC works?  
(I'm trying to learn more about GCC in general).

Also, how can I find out which patches need to be added to a given GCC  
release? For example, 4.3.0 is out, and if I wanted to make that work,  
how would I find out if it works for AVR and if not, are there are  
patches for it?

Thanks again!

--
Rick