--as-needed problem

[Szombathelyi György]

2004. november 9. 18.32 dátummal David Faure ezt írta:

> > >
> > > The problem is that libtool puts all paths to direct and indirect
> > > dependencies into the RPATH section of lt-meinproc, but since libkdeui
> > > is not a direct dependency, it's not listed in the NEEDED section.
> > >
> > > $ objdump -p lt-meinproc (only relevant parts):
> > >
> > >   NEEDED      libkio.so.4
> > >   NEEDED      libkdecore.so.4
> > >   NEEDED      libqt-mt.so.3
> > >   NEEDED      libbz2.so.1
> > >   NEEDED      libxslt.so.1
> > >   NEEDED      libxml2.so.2
> > >   NEEDED      libstdc++.so.5
> > >   NEEDED      libc.so.6
> > >   RPATH
> > > /home/gyuri/cvs/kdelibs/kio/.libs:/home/gyuri/cvs/kdelibs/kdeui/.libs:/
> > >home
> > > /gyuri/cvs/kdelibs/kdesu/.libs:/home/gyuri/cvs/kdelibs/kwallet/client/.
> > >libs:
> > > /home/gyuri/cvs/kdelibs/kdecore/.libs:/home/gyuri/cvs/kdelibs/dcop/.lib
> > >s:/ho
> > > me/gyuri/cvs/kdelibs/kdefx/.libs:/opt/kde3/lib:/usr/lib/qt-3.3/lib:/usr
> > >/X11R 6/lib:/usr/lib
> > >
> > > $ objdump -p lt-meinproc:
> > >   RPATH       /opt/kde3/lib:/usr/lib/qt-3.3/lib:/usr/X11R6/lib
> > >
> > >
> > > So the library path for libkdeui is picked from libkio (libkio is
> > > depend directly on libkdeui), which has the RPATH set to $KDEDIR/lib.
> > > But if you remove $KDEDIR/lib/libkio.so.4, the dynamic linker falls
> > > back to the RPATH in lt-meinproc, and everything will work again.
> > > I hope this small(?) inconvenience will not end in removing the
> > > --as-needed patch (if you're a developer, and disturbed by this
> > > behavior you can always compile with --disable-as-needed), it's _very_
> > > useful for making KDE packages.
>
> If it prevents compiling kdelibs, it won't be any good to packagers either.
>
> This sounds like two conflicting libtool features - can't it be fixed in
> libtool somehow? (hacking the RPATH or something)

I don't think it's easily solvable. Libtool generates custom RPATH values only 
for programs (in lt-progname), not for libraries. Libtool should 
create ./libs/lt-library_name.so.x.x.x, not just ./libs/library_name.so.x.x.x 
and link lt-progname not to library_name, but to lt-library_name. Then 
lt-library_name.so.x.x.x can contain the custom RPATH values, like 
lt-progname (which points to the build dir).

Bye,
György

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