Re: Some question about KDE in debian in the future

[CCing debian-kde so people are aware of this issue's status]

On October 22, 2005 10:47, Yves Glodt wrote:[color=blue]
> When KDE 3.5 will land in sid, will it this time be compiled with
> hidden symbols (-fvisibility), or is it still considered unstable?[/color]

Unfortunately, -fvisibility is still too buggy. The main issues are:

[url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19664[/url]
[url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19520[/url]
[url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20297[/url]

Once these are fixed, and a compiler with those fixes is deployed in Debian,
then we can take a closer look at enabling -fvisibility. Unfortunately,
this doesn't seem likely before GCC 4.1, and even that might not have all
the fixes we need.

The few distros that currently enable -fvisibility are patching GCC
themselves, and Debian doesn't usually carry major third-party patches for
this sort of issue in a key component (patches like that are often rather
dodgy, not to mention hard to support).

We'd all very much like to enable this feature, rest assured - but not
before it's truly ready.

Cheers,
Christopher Martin

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On Sunday 23 October 2005 15:01, Christopher Martin wrote:[color=blue]
> [CCing debian-kde so people are aware of this issue's status]
>
> On October 22, 2005 10:47, Yves Glodt wrote:[color=green]
> > When KDE 3.5 will land in sid, will it this time be compiled with
> > hidden symbols (-fvisibility), or is it still considered unstable?[/color]
>
> Unfortunately, -fvisibility is still too buggy. The main issues are:
>
> [url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19664[/url]
> [url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19520[/url]
> [url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20297[/url]
>
> Once these are fixed, and a compiler with those fixes is deployed in
> Debian, then we can take a closer look at enabling -fvisibility.
> Unfortunately, this doesn't seem likely before GCC 4.1, and even that
> might not have all the fixes we need.[/color]

I'm running Sid and compile KDE 3.5 from SVN with GCC 4. The only
problem I see is Debian's GCC configuration:

--enable-libstdcxx-allocator=mt

As workaround to disable these allocators I use

export GLIBCXX_FORCE_NEW=1


Cheers,
André

On October 23, 2005 10:17, André Wöbbeking wrote:[color=blue]
> On Sunday 23 October 2005 15:01, Christopher Martin wrote:[color=green]
> > [CCing debian-kde so people are aware of this issue's status]
> >
> > On October 22, 2005 10:47, Yves Glodt wrote:[color=darkred]
> > > When KDE 3.5 will land in sid, will it this time be compiled with
> > > hidden symbols (-fvisibility), or is it still considered unstable?[/color]
> >
> > Unfortunately, -fvisibility is still too buggy. The main issues are:
> >
> > [url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19664[/url]
> > [url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19520[/url]
> > [url]http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20297[/url]
> >
> > Once these are fixed, and a compiler with those fixes is deployed in
> > Debian, then we can take a closer look at enabling -fvisibility.
> > Unfortunately, this doesn't seem likely before GCC 4.1, and even that
> > might not have all the fixes we need.[/color]
>
> I'm running Sid and compile KDE 3.5 from SVN with GCC 4. The only
> problem I see is Debian's GCC configuration:
>
> --enable-libstdcxx-allocator=mt
>
> As workaround to disable these allocators I use
>
> export GLIBCXX_FORCE_NEW=1[/color]

I haven't tried with KDE 3.5, but it shouldn't make a difference relative to
3.4.x. You may be able to workaround some of the issues on i386, but one
sign of the underlying problems is that when built with gcc
visibility=hidden, many of KDE's shared objects are suddenly marked as
containing non-PIC code. This breaks completely on some architectures, and
is a sign of deeper problems on all architectures. -fvisibility is _not_
ready for prime time. Yet.

Cheers,
Christopher Martin

On Sunday 23 October 2005 16:50, Christopher Martin wrote:
[color=blue]
> I haven't tried with KDE 3.5, but it shouldn't make a difference
> relative to 3.4.x. You may be able to workaround some of the issues
> on i386, but one sign of the underlying problems is that when built
> with gcc
> visibility=hidden, many of KDE's shared objects are suddenly marked
> as containing non-PIC code. This breaks completely on some
> architectures, and is a sign of deeper problems on all architectures.
> -fvisibility is _not_ ready for prime time. Yet.[/color]

I see. I can only say that it works for me on i386 and x86_64.


Cheers,
André