From kde-core-devel  Thu Nov 01 11:05:42 2007
From: Thiago Macieira <thiago () kde ! org>
Date: Thu, 01 Nov 2007 11:05:42 +0000
To: kde-core-devel
Subject: Re: WITH_PREFIX for kdemodules?
Message-Id: <200711011205.49638.thiago () kde ! org>
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Em Thursday 01 November 2007 10:12:48 Alexander Neundorf escreveu:
> On Wednesday 31 October 2007, Thiago Macieira wrote:
> > Em Wednesday 31 October 2007 16:28:46 Matthias Kretz escreveu:
> > > On Monday 29 October 2007, Jaroslaw Staniek wrote:
> > > > Is there a technical reason (e.g. some tools expect this) to use
> > > > 'lib' prefix for kde plugins?
> > >
> > > I was chatting with dirk about this once and he convinced me that it's
> > > a nice feature to have on Linux where it's possible to use the lib as
> > > plugin and shared lib at the same time. E.g. applications like konsole
> > > that provide a KPart and a shell. To save some startup time konsole on
> > > Linux could link to it's part instead of dlopening it.
> >
> > That's a great feature, but that doesn't work in all platforms.
> >
> > Fortunately, I don't know of any platform that Qt supports and where th=
at
> > feature isn't supported. I recall MacOS X being one of them, but I no
> > longer can find that information.
> >
> > Maybe it's for MacOS X < 10.3 (which introduced dlfcn.h and dlopen(3)).
>
> Which feature ?
> Linking to a shared library (which is a plugin at the same time) which
> doesn't have the "lib" prefix ?

The feature in which "module" and "library" are the same.

Normally, you can:
 - link to a library
 - dlopen a module

With ELF, you also can:
 - dlopen a library
 - link to a module

That's because modules and libraries are the same thing called "shared=20
objects".

MacOS X (Mach-O file format) has a difference between those two: modules ar=
e=20
of type MH_BUNDLE while libraries are of type MH_DYLIB. But I've just check=
ed=20
the Qt/Mac builds and our plugins are MH_DYLIB -- that's probably why the=20
restriction no longer applies.

None of the other platforms we support have this distinction (AIX is XCOFF,=
=20
Windows is COFF PE, everything else is ELF).

=2D-=20
=A0 Thiago Macieira =A0- =A0thiago (AT) macieira.info - thiago (AT) kde.org
=A0 =A0 PGP/GPG: 0x6EF45358; fingerprint:
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