[gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Enrico Weigelt]

Hi folks,


I'm just installing qemu, which requires gcc-3.x for building. 
The current breaks are very ugly, IMHO. 

So I'm proposing to add the old gcc-3.x as depedency to qemu,
at least as long as it doesn't build w/ newer gcc. 

What do you think about this ?


cu
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Re: [gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Peter Volkov]

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В Вск, 04/05/2008 в 21:48 +0200, Enrico Weigelt пишет:
> I'm just installing qemu, which requires gcc-3.x for building. 
> The current breaks are very ugly, IMHO. 
> 
> So I'm proposing to add the old gcc-3.x as depedency to qemu,
> at least as long as it doesn't build w/ newer gcc. 
> 
> What do you think about this ?

How do you suppose to change gcc version portage uses on-the-fly?
Please, answer trough bugzilla where most bug reports/feature requests
should normally go.

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Peter.

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Re: [gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Enrico Weigelt]

* Peter Volkov <pva@gentoo.org> schrieb:
> ?? ??????, 04/05/2008 ?? 21:48 +0200, Enrico Weigelt ??????????:
> > I'm just installing qemu, which requires gcc-3.x for building. 
> > The current breaks are very ugly, IMHO. 
> > 
> > So I'm proposing to add the old gcc-3.x as depedency to qemu,
> > at least as long as it doesn't build w/ newer gcc. 
> > 
> > What do you think about this ?
> 
> How do you suppose to change gcc version portage uses on-the-fly?

* add an small gcc3-wrapper script/symlink (eg. /usr/bin/gcc-3)
* rewrite the qemu ebuild to properly set $CC, etc.

> Please, answer trough bugzilla where most bug reports/feature requests
> should normally go.

Is there already an open bug on this ?


BTW: even with gcc-3.x qemu fails to build. this has been reported
multiple times, but none of the suggestions worked :(


cu
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 Enrico Weigelt    ==   metux IT service - http://www.metux.de/
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 Patches / Fixes for a lot dozens of packages in dozens of versions:
	http://patches.metux.de/
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Re: [gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Matthias Schwarzott]

On Montag, 5. Mai 2008, Peter Volkov wrote:
> В Вск, 04/05/2008 в 21:48 +0200, Enrico Weigelt пишет:
> > I'm just installing qemu, which requires gcc-3.x for building.
> > The current breaks are very ugly, IMHO.
> >
> > So I'm proposing to add the old gcc-3.x as depedency to qemu,
> > at least as long as it doesn't build w/ newer gcc.
> >
> > What do you think about this ?
>
> How do you suppose to change gcc version portage uses on-the-fly?
> Please, answer trough bugzilla where most bug reports/feature requests
> should normally go.

I suggest something like this:
Get correct path of gcc-3 executable, then supply this with $CC to make.


Code may look like this:

# get last one of sorted list
for t in $(ls -1 /usr/bin/gcc-3*|sort); do
	p=$t
done
einfo "Using $p for compiling."
emake CC=$p

Matthias
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[gentoo-dev] Re: RFC: qemu -> add gcc-3.x dependency

[Steve Long]

Matthias Schwarzott wrote:
> Code may look like this:
> 
> # get last one of sorted list
> for t in $(ls -1 /usr/bin/gcc-3*|sort); do
use teh globs, luke ;)
for t in /usr/bin/gcc-3*; do # will already do this, sorting according to
LC_COLLATE order (set to C or POSIX [same thing] for ebuild.) There's no
need to step through every one either:
t=(/usr/bin/gcc-3*); p=${t[@]: -1}; unset t # get rid of array storage
(using same var for both, eg t=${t[@]: -1} only sets the first cell; the
rest of the array is still live. var is a synonym for var[0] in BASH.)

set -- *
t=${@: -1} # works here as well but dunno if that applies to all sh (the -1
expansion, not the set.) In any event not needed in BASH since arrays make
our life so much easier ;)

cf: /msg greybot ls and http://wooledge.org/mywiki/glob -- remember you can
do, eg: for i in portage/*/*foo*/*.ebuild
or a more common example: for f in */*/.jpg
It's not find, but it is efficient and filename-safe.

Regards,
steveL.

(Please, no complaints about not using spaces in filenames, there's no
telling where your script could be used-- if it's written correctly.
Subshells and externals as well; why fork and waste resources we don't have
to?)


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Re: [gentoo-dev] Re: RFC: qemu -> add gcc-3.x dependency

[Matthias Schwarzott]

On Samstag, 10. Mai 2008, Steve Long wrote:
> Matthias Schwarzott wrote:
> > Code may look like this:
> >
> > # get last one of sorted list
> > for t in $(ls -1 /usr/bin/gcc-3*|sort); do
>
> use teh globs, luke ;)
> for t in /usr/bin/gcc-3*; do # will already do this, sorting according to
> LC_COLLATE order (set to C or POSIX [same thing] for ebuild.) There's no
> need to step through every one either:
> t=(/usr/bin/gcc-3*); p=${t[@]: -1}; unset t # get rid of array storage
> (using same var for both, eg t=${t[@]: -1} only sets the first cell; the
> rest of the array is still live. var is a synonym for var[0] in BASH.)
>
> set -- *
> t=${@: -1} # works here as well but dunno if that applies to all sh (the -1
> expansion, not the set.) In any event not needed in BASH since arrays make
> our life so much easier ;)
>
Well, you want it compact, without loops.
Here is it:

set -- /usr/bin/gcc-3*
Get first entry: CC="$1"
Get last entry: eval CC="\${$#}"

Regards
Matthias
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[gentoo-dev] Re: Re: RFC: qemu -> add gcc-3.x dependency

[Steve Long]

Matthias Schwarzott wrote:
> Well, you want it compact, without loops.
> Here is it:
> 
> set -- /usr/bin/gcc-3*
> Get first entry: CC="$1"
> Get last entry: eval CC="\${$#}"
> 
Nice one, yeah I thought : splitting was posix silly me ;)
I still shy clear of eval for general use and you have to go thru
contortions with sh, so I'll stick with BASH arrays and "syntactic sugar"
which gets twisted enough as it is.


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Re: [gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Jan Kundrát]

Enrico Weigelt wrote:
> I'm just installing qemu, which requires gcc-3.x for building. 
> The current breaks are very ugly, IMHO. 
> 
> So I'm proposing to add the old gcc-3.x as depedency to qemu,
> at least as long as it doesn't build w/ newer gcc. 

Hi Enrico, it is usually a good idea to search through the Bugzilla 
before asking for some feature, chances are that it has been already 
requested (in this case, you're looking for bug 190102). FYI, at least 
some of qemu's features were ported to gcc4 -- for example, see the 
kvm-qemu ebuild from bug 157987.

Cheers,
-jkt

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Re: [gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Alon Bar-Lev]

On 5/5/08, Jan Kundrát <jkt@gentoo.org> wrote:
>  Hi Enrico, it is usually a good idea to search through the Bugzilla before
> asking for some feature, chances are that it has been already requested (in
> this case, you're looking for bug 190102). FYI, at least some of qemu's
> features were ported to gcc4 -- for example, see the kvm-qemu ebuild from
> bug 157987.

I also waiting for gcc-4 enabled qemu for long time...
The problem that "emerge --emptytree world" will not work when
packages are compiled in different gcc versions.
The kvm-qemu is not relevant if you don't have the hardware.

One solution I saw is to compile gcc-3 as part of the qemu build
process, and make the qemu use this gcc-3 instance. This way you can
have qemu up and running while the system is configured for gcc-4.

It is very disappointing that upstream does not allow gcc-4
configuration so long after gcc-4 release.

Alon.

Re: [gentoo-dev] RFC: qemu -> add gcc-3.x dependency

[Luca Barbato]

Enrico Weigelt wrote:
> Hi folks,
> 
> 
> I'm just installing qemu, which requires gcc-3.x for building. 
> The current breaks are very ugly, IMHO. 
> 
> So I'm proposing to add the old gcc-3.x as depedency to qemu,
> at least as long as it doesn't build w/ newer gcc. 
> 
> What do you think about this ?
> 

that qemu is a sore exception, you should help upstream porting to gcc-4 
if you have time, every people concerned should.

Nowadays most of the work left to be done is _pretty_ boring and 
_pretty_ simple so everybody could help patching ^^

lu

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http://dev.gentoo.org/~lu_zero

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