Re: [avr-libc-dev] Re: Patches to add mega325-3250-645-6450 to binutils and gcc.

[E. Weddington]

Marek Michalkiewicz wrote:

> On Thu, Mar 10, 2005 at 11:05:39PM +0100, Joerg Wunsch wrote:
>
>  
>
> but I think
> I have an idea which I think would be a good compromise (fast build,
> and not much disk space needed for installation).
>
> With a small change in LIB_SPEC ("%{mmcu=*:-lavr-%*}" added), GCC
> should be able to look for a small per-device library (such as
> libavr-atmega128.a) in addition to the generic (per-core) libc.a.
> With the correct link order, a per-device library can override
> libc.a to provide better optimized device-specific functions.
>
>  
What a great idea!

What if the library doesn't exist? Would it error? Or just silently 
continue?

Because if it just silently continues, then one can add the change to 
LIB_SPEC for all devices, and then if we need them at a later point we 
could create them later without any errors.

> BTW, if we forget backwards compatibility with DOS 8.3, and full device
> names (instead of shortened ones) become part of filenames (crtm128.o ->
> crt-atmega128.o etc.), GCC spec strings could be simplified a lot, and
> there would be one less place to maintain a list of supported devices.
>
>  
I would heartily agree to this. IIRC WinAVR doesn't work to well on 
Win95, which is no longer supported by MS anyway. So we're dealing with 
Win98 and forward, all of which AFAIK have long filename support. We're 
building GCC for a Windows (MinGW) host, not for DJGPP. So I'm all for 
dropping 8.3 filename support.

Could you give a little more detail in how/where the spec strings could 
be simplified?

> That's how I would do this if I had the
> time these days...
If you don't have much time, have you considered seeing if there can be 
another AVR maintainer for GCC? You've been the one comitting patches 
recently. Denis doesn't seem to be doing a whole lot on the port. If 
Joerg doesn't want to do it (and I don't blame him for not wanting to), 
there's Bernardo Innocenti and/or Giovanni Bajo; they're both interested 
in the AVR port and already have Write On Approval.

Eric