On Tuesday 21 April 2009 17:37:50 David Naylor wrote:
> On Tuesday 21 April 2009 10:32:04 Mel Flynn wrote:
> > Hi David,
> >
> > On Monday 20 April 2009 21:48:39 David Naylor wrote:
> > > There has been an article recently published by phoronix
> > > (http://www.phoronix.com/scan.php?page=article&item=pcbsd_vs_kubuntu&nu
> > >m= 1) that compares PC-BSD to Kubuntu.  Kubuntu uses GCC 4.3.3 compared
> > > to FreeBSD's GCC 4.2.2.  There is a considerable performance difference
> > > between the two OS's, the article contributes this difference to the
> > > compiler.
> >
> > Nice shot in the dark, since except the calculations a lot of these are
> > influenced by "journaled FS vs stock UFS".
>
> I know, benchmarking anything but the simplest things are influenced by too
> many factors.  Pity it doesn't provide an unbiased comparison of FreeBSD
> and Linux.

That and comparing apples and pears as default configured fruit, don't usually 
work well. Of course it appeals to the end user "which fruit is healthier".

> > > In order to check if this is so (and to get the speed improvements of
> > > GCC 4.3+) one needs to compile the ports (and preferable world/kernel
> > > as well) with GCC 4.3+.
> >
> > It's license is incompatible with world/kernel.
>
> What type of incompatibility.  I know FreeBSD has reservations about GPLv3
> (I personally don't understand why everyone cannot be friends and use BSD
> Licenses).  So is this a policy incompatibility or a legal one (i.e. would
> it be 'illegal' for me to use GCC 4.3+ to compile world/kernel, as an
> end-user/consumer of FreeBSD).  I assume the same discussion applies to
> binutils.

Policy. Only legal issue in FreeBSD for the end user is WITH_IDEA.

> > That said, install
> > lang/gcc43 and set CC/CXX for ports. World/kernel would be a lot harder.
> > Maybe setting WITHOUT_GCC in /etc/src.conf and setting CC/CXX would work,
> > but there's quite a few modifications to gcc that aren't in ports
> > lang/gcc, so I have my doubts.
>
> I suppose it would be nice if there was an easy way to use an out-of-source
> compiler in FreeBSD.  Like set PORTS_COMPILER=gcc43 and the port will
> installed and used... One may have dreams.

cat <<'EOF' >> /etc/make.conf
.if !empty(.CURDIR:M/usr/ports/*)
CC=/usr/local/bin/gcc43
CXX=/usr/local/bin/g++43
.endif
EOF

Pretty close, huh?

> > > Is there an easy way to set this up and does anyone know the
> > > compatibility of world/kernel/ports with GCC 4.3+?
> > >
> > > Also has anyone tried this and benchmarked the result?
> >
> > Not me, but be sure to stick around for the new non-gcc compiler coming
> > to a FreeBSD near you. And with the work done by Marcel Molenaar on
> > gpart, hopefully we can have ZFS and gjournal as choices in the
> > installer.
>
> You mean llvm, waiting patiently.  I suppose my suggestion above will
> become even more important (at least for compiling ports) since it will be
> a while till llvm has decent c++ support.

Yeah, I don't know how that's gonna work if llvm is ready for base, but no 
c++. I guess we'll have to sit out g++ 4.2 for a while. If you're in the 
position to do so, I'd do their benchmarks with ZFS and see how much 
difference that already makes.
-- 
Mel
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