[gentoo-user] gcc 3.4.6 vs. 4.1.1

[gentoo-user] gcc 3.4.6 vs. 4.1.1

[Grant Edwards]

All of my gentoo systems have both gcc 3.4 and 4.1 but still
use 3.4 for everything except packages that just won't build
with gcc 3.4.

I'm curious what other people are doing.  Have most people
switched over to 4.1 as their "main" compiler?

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Re: [gentoo-user] gcc 3.4.6 vs. 4.1.1

[Bo Ørsted Andresen]

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On Wednesday 14 February 2007 20:47:45 Grant Edwards wrote:
> I'm curious what other people are doing.  Have most people
> switched over to 4.1 as their "main" compiler?

I did that last May. And not just main but only C compiler (No I don't use 
qemu). ;)

-- 
Bo Andresen

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Re: [gentoo-user] gcc 3.4.6 vs. 4.1.1

[Boyd Stephen Smith Jr.]

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On Wednesday 14 February 2007, Grant Edwards <grante@visi.com> wrote 
about '[gentoo-user]  gcc 3.4.6 vs. 4.1.1':
> All of my gentoo systems have both gcc 3.4 and 4.1 but still
> use 3.4 for everything except packages that just won't build
> with gcc 3.4.
>
> I'm curious what other people are doing.  Have most people
> switched over to 4.1 as their "main" compiler?

I switched completely over to gcc 4.x before it when stable in the tree, it 
started producing better binaries for most applications than gcc 3.4 
faster just a little before 4.1.0 came out.

I believe there's still at least one package that doesn't build with gcc 
4.x (kqemu), so there's some reason to still stay on 3.4 if you are 
cautious.

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Re: [gentoo-user] gcc 3.4.6 vs. 4.1.1

[Ric de France]

Grant,

On 15/02/07, Grant Edwards <grante@visi.com> wrote:
> All of my gentoo systems have both gcc 3.4 and 4.1 but still
> use 3.4 for everything except packages that just won't build
> with gcc 3.4.
>
> I'm curious what other people are doing.  Have most people
> switched over to 4.1 as their "main" compiler?

Switched over late last year. Nothing to report that's out of the
ordinary. All servers (4) and the desktop have been totally recompiled
with 4.1.

HTH,

...Ric
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Re: [gentoo-user] gcc 3.4.6 vs. 4.1.1

[Willie Wong]

On Wed, Feb 14, 2007 at 02:13:44PM -0600, Boyd Stephen Smith Jr. wrote:
> I believe there's still at least one package that doesn't build with gcc 
> 4.x (kqemu), so there's some reason to still stay on 3.4 if you are 
> cautious.
> 
You mean qemu-softmmu. kqemu has almost always been compilable by gcc4, 
and the most recent version of qemu-user seems to allow building by gcc4
(though I am a bit skeptical about the ebuild having gcc-check commented 
out and forcing make to not do its gcc version checks). 

W

-- 
Willie W. Wong                                      wwong@math.princeton.edu
408 Fine Hall,  Department of Mathematics,  Princeton University,  Princeton
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[gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Grant Edwards]

On 2007-02-14, Bo Ørsted Andresen <bo.andresen@zlin.dk> wrote:
> --nextPart1799414.yjjTeni5oG
> Content-Type: text/plain;
>   charset="utf-8"
> Content-Transfer-Encoding: quoted-printable
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>
> On Wednesday 14 February 2007 20:47:45 Grant Edwards wrote:
>> I'm curious what other people are doing.  Have most people
>> switched over to 4.1 as their "main" compiler?
>
> I did that last May. And not just main but only C compiler (No I don't use 
> qemu). ;)

I do use Qemu, which was one reason I didn't switch earlier.

-- 
Grant Edwards                   grante             Yow!  Did an Italian CRANE
                                  at               OPERATOR just experience
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                                                   a MALIBU HOT TUB?

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Re: [gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Jerry McBride]

On Wednesday 14 February 2007 03:58:58 pm Grant Edwards wrote:
> On 2007-02-14, Bo Ørsted Andresen <bo.andresen@zlin.dk> wrote:
> > --nextPart1799414.yjjTeni5oG
> > Content-Type: text/plain;
> >   charset="utf-8"
> > Content-Transfer-Encoding: quoted-printable
> > Content-Disposition: inline
> >
> > On Wednesday 14 February 2007 20:47:45 Grant Edwards wrote:
> >> I'm curious what other people are doing.  Have most people
> >> switched over to 4.1 as their "main" compiler?
> >
> > I did that last May. And not just main but only C compiler (No I don't
> > use qemu). ;)
>
> I do use Qemu, which was one reason I didn't switch earlier.
>

If it helps you, we compile the current sources using gcc-3.4.6-r2, then  make 
a quickpkg of it and distribute as needed... Works well and you only need one 
machine with the older gcc.

Cheers.

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Jerry McBride
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Re: [gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Willie Wong]

On Wed, Feb 14, 2007 at 08:58:58PM +0000, Grant Edwards wrote:
> I do use Qemu, which was one reason I didn't switch earlier.

Might as well wait. Rumour has that the replacement for dyngen in qemu 
is almost ready (the earlier forecast was before end of this month), and
you've already waited this long...

W
-- 
Willie W. Wong                                      wwong@math.princeton.edu
408 Fine Hall,  Department of Mathematics,  Princeton University,  Princeton
A mathematician's reputation rests on the number of bad proofs he has given.
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Re: [gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Norberto Bensa]

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> I do use Qemu, 

Me too but:

$ emerge --info
Portage 2.1.2-r9 (default-linux/x86/2006.1/desktop, gcc-4.1.1, glibc-2.5-r0, 
2.6.19-gentoo-r5 i686)


You can use gcc-config to switch to 3.4, compile app-emulation/qemu-softmmu 
and then swith to 4.1 again. 

Regards,
Norberto

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[gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Grant Edwards]

On 2007-02-14, Norberto Bensa <nbensa@gmx.net> wrote:

>> I do use Qemu, 
>
> Me too but:
>
> $ emerge --info
> Portage 2.1.2-r9 (default-linux/x86/2006.1/desktop, gcc-4.1.1, glibc-2.5-r0, 
> 2.6.19-gentoo-r5 i686)
> You can use gcc-config to switch to 3.4, compile app-emulation/qemu-softmmu 
> and then swith to 4.1 again. 

I know -- that's what I do now (except the other way around)
for packages that require gcc 4.  I just figured I wait to do
the big switch/recompile until I can get rid of 3.4 completely.

I'll probably just do a clean reinstall at that point.  When I
switched gcc from 3.2 to 3.3, it would have been a lot less
work to just re-install from scratch.

-- 
Grant Edwards                   grante             Yow!  .. I want FORTY-TWO
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Re: [gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Dale]

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Grant Edwards wrote:
> On 2007-02-14, Norberto Bensa <nbensa@gmx.net> wrote:
>
>   
>>> I do use Qemu, 
>>>       
>> Me too but:
>>
>> $ emerge --info
>> Portage 2.1.2-r9 (default-linux/x86/2006.1/desktop, gcc-4.1.1, glibc-2.5-r0, 
>> 2.6.19-gentoo-r5 i686)
>> You can use gcc-config to switch to 3.4, compile app-emulation/qemu-softmmu 
>> and then swith to 4.1 again. 
>>     
>
> I know -- that's what I do now (except the other way around)
> for packages that require gcc 4.  I just figured I wait to do
> the big switch/recompile until I can get rid of 3.4 completely.
>
> I'll probably just do a clean reinstall at that point.  When I
> switched gcc from 3.2 to 3.3, it would have been a lot less
> work to just re-install from scratch.
>
>   

When I switched a while back, I found a script to do the recompile on
the forums that worked very well.  It is better than doing a system
twice then a world on top of that.  I have a copy of the script if you
would like to use it but it is on the forums somewhere.  I may can find
it.  I think it is in the documentation tips and tricks section, I think.

I haven't had any trouble after my upgrade.  I guess it depends on what
you have installed though from what I have read in your posts.

Dale

:-)  :-)  :-)

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[gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Grant Edwards]

On 2007-02-15, Dale <dalek@exceedtech.net> wrote:

>> I know -- that's what I do now (except the other way around)
>> for packages that require gcc 4.  I just figured I wait to do
>> the big switch/recompile until I can get rid of 3.4 completely.
>>
>> I'll probably just do a clean reinstall at that point.  When I
>> switched gcc from 3.2 to 3.3, it would have been a lot less
>> work to just re-install from scratch.
>
> When I switched a while back, I found a script to do the recompile on
> the forums that worked very well.  It is better than doing a system
> twice then a world on top of that.  I have a copy of the script if you
> would like to use it but it is on the forums somewhere.  I may can find
> it.  I think it is in the documentation tips and tricks section, I think.

I think I've seen it.  The last time I around I followed a
script in a HOWTO using revdep-rebuild, and I ran into a lot of
problems during the re-compile: there were about a half dozen
packages that wouldn't rebuild.  Getting things going again
required about two days of masking different versions of
different packages (each of which required masking a bunch of
dependencies to get compatible versions of everything).

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Grant Edwards                   grante             Yow!  Not SENSUOUS... only
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Re: [gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[Dale]

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Grant Edwards wrote:
> On 2007-02-15, Dale <dalek@exceedtech.net> wrote:
>
>   
>>> I know -- that's what I do now (except the other way around)
>>> for packages that require gcc 4.  I just figured I wait to do
>>> the big switch/recompile until I can get rid of 3.4 completely.
>>>
>>> I'll probably just do a clean reinstall at that point.  When I
>>> switched gcc from 3.2 to 3.3, it would have been a lot less
>>> work to just re-install from scratch.
>>>       
>> When I switched a while back, I found a script to do the recompile on
>> the forums that worked very well.  It is better than doing a system
>> twice then a world on top of that.  I have a copy of the script if you
>> would like to use it but it is on the forums somewhere.  I may can find
>> it.  I think it is in the documentation tips and tricks section, I think.
>>     
>
> I think I've seen it.  The last time I around I followed a
> script in a HOWTO using revdep-rebuild, and I ran into a lot of
> problems during the re-compile: there were about a half dozen
> packages that wouldn't rebuild.  Getting things going again
> required about two days of masking different versions of
> different packages (each of which required masking a bunch of
> dependencies to get compatible versions of everything).
>
>   

I had a few that wouldn't compile, not because of the script though, but
I just skipped those and fixed them later on.  I didn't have any more
trouble than I did when I did a emerge world without the script before
though.  I'm not sure I ever made it through a emerge world without
something failing.  I have a lot of packages so something has to go
wrong somewhere.

Dale

:-)  :-)  :-)

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Re: [gentoo-user] gcc 3.4.6 vs. 4.1.1

[Andrey Gerasimenko]

On Wed, 14 Feb 2007 22:47:45 +0300, Grant Edwards <grante@visi.com> wrote:

> All of my gentoo systems have both gcc 3.4 and 4.1 but still
> use 3.4 for everything except packages that just won't build
> with gcc 3.4.
>
> I'm curious what other people are doing.  Have most people
> switched over to 4.1 as their "main" compiler?
>

I installed Gentoo recently and it naturally has only 4.1. No problems, of  
course. When I discovered I needed 3.* to compile qemu or any other  
emulation I found, I just installed free binaries of VirtualBox. I guess  
that is what the absolute majority of newbuys are doing.

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Re: [gentoo-user] Re: gcc 3.4.6 vs. 4.1.1

[b.n.]

Grant Edwards ha scritto:

> I'll probably just do a clean reinstall at that point.  When I
> switched gcc from 3.2 to 3.3, it would have been a lot less
> work to just re-install from scratch.

My personal experience is that it is no more such a bad hassle. For
upgrading to gcc 4.1.x you have to re-emerge ALL. This sounds tragic (it
sounded tragic to me), but it's not. It's simply slow (It took about 5
days to recompile all my 900 packages on my old AMD Duron 1800...yes I
know I install a lot of cruft that I forget to uninstall). You can
easily have your system running happily while doing this. Just check
that the emerge is running a couple of times a day (some package may
fail here and there: in this case, just take note and emerge --resume
--skipfirst. When it has all finished, you can care about it later).

My personal rule of thumb is to wait AT LEAST a month after a new,
incompatible GCC has been marked stable. That's because often many
packages still fail/have troubles with the new compiler. In the first
months all major hassles are ironed out, packages are upgraded
accordingly and the transition becomes smooth.

So, in going towards gcc 4.1 (something I delayed 6 months) you should
have almost no problem. :)

m.
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