Re: [MiNT] LDG vs. SLB vs. custom OVL-thingies

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Miro Kropáček wrote:
> Wow, it seems I've got either serious problems with my setup or gcc has got
> some serious CF regressions... just for fun I wanted to try 4.6.0 and it
> crashed for coldfire even by mintlib compilation.

Yes, I already mentioned that bug here on the list, it was already known:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47612

The proposed patches cure the crash, but it is still not proven that the fix 
produces the expected result, so the patch is not yet committed.

However, it is a minor bug. It appears only for ColdFire when compiling some 
printf file in the MiNTLib. For this file only, just replace -O2 with -O1 
and the problem goes away.

The ColdFire target seems to be more complicated than 680x0 one. I have seen 
that GCC reorders the assembler instructions for better pipeline 
performance, this does not happen on other targets.

If you are interested in hacking GCC 4.6.0, my current work in progress is here:
http://vincent.riviere.free.fr/soft/m68k-atari-mint/archives/unsupported/gcc-4.6.0/
I had to rework the patch a bit for libstdc++-v3.
The proposed patch for the MiNTLib's compile crash is not included.

I tested successfully to compile an run some of my favorite software with 
that compiler, so it is probably not so buggy.
It produces more warnings than before, FreeMiNT (with its damn -Werror) will 
need fixing (I didn't do that).

Final note, I will be away for some time, don't expect much from me the next 
weeks.

--
Vincent Rivière