RE: [avr-gcc-list] gcc 4.2.0 - patches and at90usb82

[Eric Weddington]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Timo Sandmann
> Sent: Saturday, May 26, 2007 12:51 PM
> To: address@hidden
> Subject: [avr-gcc-list] gcc 4.2.0 - patches and at90usb82
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> 
> I've got two questions about the gcc 4.2.0:
> 1) With the gcc 4.2.0 release (14.05.2007) I can't build a 
> binary for  
> the AVR at90usb82. I don't need support for an at90usb82, but  
> building the avr-libc 1.4.6 fails for that reason (as 
> describe on the  
> list some time ago for a pre-release of the gcc 4.2). With 
> this patch  
> <http://gcc.gnu.org/ml/gcc-patches/2007-03/msg01821.html> it works  
> (there are no errors, but I didn't test the binary, because I 
> have no  
> at90usb82). So is this patch not included in the actual release and  
> schould be applied manually? I didn't find something else for 
> the gcc  
> 4.2.0 release on the web.
> 
> 2) There are serveral patches for the gcc 4.1.x available at <http:// 
> www.freebsd.org/cgi/cvsweb.cgi/~checkout~/ports/devel/avr-gcc/
> files>,  
> which of these are not included in the gcc 4.2.0 release and should  
> be applied to the gcc 4.2.0?
> 
> Btw: The software I'm using with an ATmega644 works fine with 
> the gcc  
> 4.2.0 and avr-libc 1.4.6. :-)

Hi Timo,

The patches that I use can now be gotten in the WinAVR CVS:
<http://sourceforge.net/projects/winavr>
These patches are little more extensive than Jörg's current FreeBSD patches.
IIRC, they fix a few more bugs.

However, these patches cover binutils 2.17, and gcc 4.1.2.

You'll need to use the binutils 2.17 patches as the "newdevices" patch adds
support for the at90usb82. This is needed for support in gcc. Basically
support for any new device needs to be in binutils, gcc, and avr-libc.

In my current build of gcc 4.2.0, I use the following patches:
00-gcc-4.2.0-version-WinAVR.patch
10-gcc-4.2.0-c-incpath.patch
11-gcc-4.2.0-exec-prefix.patch
20-gcc-4.2.0-libiberty-Makefile.in.patch
30-gcc-4.2.0-binary-constants.patch
40-gcc-4.2.0-bug-28902.patch
41-gcc-4.2.0-bug-10768.patch (Ada only)
51-gcc-4.2.0-mega256-v2.patch

Most of the patches above are copied over from the patch list for 4.1.2. The
Ada only patch (for bug 10768) requires that you extract the Ada package in
the archive tree. If you're not interested in Ada, this patch can be
skipped. To support the mega256x devices requires a new version (v2) of the
patch (i.e. it's not just copied over from 4.1.2).

Unfortunately I don't have the 4.2.0 patches in the WinAVR CVS yet. I can
probably do so early next week. It may not be the final list yet, but the
toolchain successfully builds for me with these.

HTH,
Eric Weddington