Re: Trouble with JAR resources

[Marco Trudel <marco at mtsystems dot ch>]

Andrew Haley wrote:
> Thomas Christensen wrote:
>
> > I have compiled SWT/JFACE jars to object files without any issues, but I
> > have a little trouble linking them with my app.
> >
> > It seems I have compiled some resources from the jars into the objects,
> > and they conflict, since they are present in multiple jars.
> >
> > The jars in question are:
> >
> >   org.eclipse.core.commands_3.4.0.I20080509-2000.jar
> >   org.eclipse.equinox.common_3.4.0.v20080421-2006.jar
> >   org.eclipse.jface_3.4.1.M20080827-2000.jar
> >   org.eclipse.osgi_3.4.2.R34x_v20080826-1230.jar
> >   org.eclipse.swt.gtk.linux.x86_3.4.1.v3449c.jar
> >
> > from Eclipse Classic 3.4.1.
> >
> > I issue the command:
> >
> >   $ gcj --main=Foo org.eclipse.core.commands_3.4.0.I20080509-2000.o org.eclipse.equinox.common_3.4.0.v20080421-2006.o org.eclipse.jface_3.4.1.M20080827-2000.o org.eclipse.osgi_3.4.2.R34x_v20080826-1230.o org.eclipse.swt.gtk.linux.x86_3.4.1.v3449c.o Foo.o -o foo
> >
> > and get multiple link errors like these:
> >
> >   org.eclipse.equinox.common_3.4.0.v20080421-2006.o:(.rodata+0x0): multiple definition of `java resource META__U2d_INF/ECLIPSE.SF'
> >   /usr/bin/ld: Warning: size of symbol `java resource META__U2d_INF/ECLIPSE.SF' changed from 9564 in org.eclipse.core.commands_3.4.0.I20080509-2000.o to 6528 in org.eclipse.equinox.common_3.4.0.v20080421-2006.o
> >
> > Can I avoid adding these resources when compiling the jars?  Or maybe
> > strip them from the object files?
>
> Not easily.  I'd either strip them from the jars before compiling or
> compile with -findirect-dispatch.

An easy temporary solution might also be -Wl,--allow-multiple-definition.


Marco

> Andrew.