[gentoo-amd64] Re: Re: Re: Re: Giving up 64 platform

[Duncan]

Brandon Edens posted <20060426085738.GA8109@××××××××××××.net>, excerpted
below,  on Wed, 26 Apr 2006 04:57:38 -0400:

> You've inspired me. I'll see about getting gcc 4.1 running on my laptop
> AND finally learning how to correctly slot packages. To think I've gone
> this long without properly reading the documentation. *DUCK*

The slotting is pretty much done for you.  The only thing there you need
to decide is whether you want USE=multislot or not.  Without multislot
(the default), you get one each gcc 3.4, 4.0, 4.1, etc.  With it, you'd
get 3.4.5, 3.4.6, 4.0.2, 4.0.3, and 4.1.0 -- and 4.2.0-snapshot if you are
brave enough.

Rather, what you need to worry about is gcc-config or eselect compiler.
(The latter is still masked, but will eventually deprecate gcc-config --
I'd recommend sticking with gcc-config for now, as there are certain
issues with eselect-compiler on amd64.  The issues can be worked around
for those who want to, but it's a bit complex to explain and it doesn't
work quite as expected without manual workaround intervention, so
gcc-config continues too be the best choice for those new to the idea.)

Basically, it becomes a matter of listing out the available gcc
choices, then running gcc-config again with the set option to set the one
you want.  The process is very similar to opengl-update, if you've used
that.

The only other issue to be aware of is that while gcc 4.0 and 4.1 are
fairly compatible with gcc 3.4, there's a slight difference in libstdc++. 
A few (not many) applications compiled with gcc-4.x won't work quite right
when run against the libstdc++ from gcc-3.4.x.  The only place I noticed
this was with khtml from KDE, thus konqueror, khelpcenter, and kweather,
among other applications using khtml.  If you've compiled kdelibs with
gcc-4.x, then switch back to gcc-3.4.x, khtml doesn't work.  It works
again after you toggle back to 4.x.  There's a workaround involving
creating a shortcut, but I've forgotten the details.  However, that's the
only compatibility issue I've experienced, and it's minor enough -- just  
compile KDE with 3.4.x or keep the system toggled to 4.0 or better by
default and don't try to launch konqueror and the like when you have
gcc-config pointed at 3.x.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman in
http://www.linuxdevcenter.com/pub/a/linux/2004/12/22/rms_interview.html


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