[M3devel] gcc 4.5

[Jay K]

This is moving along now. I've moved a few targets to 4.5.1 already.
Some targets I haven't tested yet.
Some have problems and I've held them back pending investigation.
In some cases I compromise, e.g. turning off optimization on ALPHA_OSF.

Eventually I might move some forward without testing.

Generally I cross build, then self build, and startup some GUI apps.
Though my X server is presently broken.

 - Jay

> From: jay.krell at cornell.edu
> To: m3devel at elegosoft.com
> Subject: gcc 4.5
> Date: Sun, 11 Jul 2010 23:51:43 +0000
> 
> 
> I'm inclined to make gcc 4.5 the default backend very soon.
> AMD64_DARWIN, I386_LINUX, SOLgnu are looking ok.
>   I could also test PPC, like PPC_LINUX.
> 
> SOLgnu leaves everything volatile (same as 4.3) so maybe isn't much validation.
> 
> I doubt there is much value in testing other operating systems, mainly just other processors.
>    Though there is sometimes, e.g. I think I386_DARWIN uses sse for floating point and other I386 systems don't.
>    I should also test SPARC_LINUX to get sparc w/o volatile.
> 
> 
> There are many other targets. OpenBSD, NetBSD, FreeBSD, OSF/1, I386/AMD64_SOLARIS, ARMEL_LINUX, Cygwin, MinGW, etc.
> Others can test them?
> 
> 
> There is some downside, in particular I disable more optimization at -O3 than with gcc 4.3.
> One of the additional optimizations perhaps doesn't exist in 4.3 though.
> 
> 
> The label/barrier thing still isn't resolved.
> I haven't run through m3-sys/m3tests.
> 
> 
> But that the system can build itself is a good sign, though sometimes I overvalue it.
> And I tested some gui apps at least unoptimized.
> The "man vs. boy" test works.
> 
> 
> The 4.3 backend will remain available via cm3 -DGCC43 in the m3cc directory.
>   You have to be careful about cm3cfg.common probing around and finding the intended one,
>   such as by deleting all others.
> 
> 
>  - Jay
 		 	   		  
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