Re: -Wl,--as-needed considered possibly harmful
On Mon, 10 Dec 2007, Sune Vuorela wrote:
> On 2007-12-10, Loïc Minier <email@example.com> wrote:
> > I think in both cases it was something like the main binary being
> > linked to many utility libraries (because it was easy to link it to
> > everything which configure found), and then the plugin calling directly
> > into these libs, but not being linked to them. If the main binary
> > didn't actually use the libs, these were stripped out, and then the
> > dlopening of the plugins would fail.
> > These were really issues in the build process, issues which would
> > have been caught with -z defs before --as-needed (which is why I'm
> > advocating usage of -z defs before --as-needed), but slipped silently
> > in the end package and actually hit users.
> Isn't the new dpkg-shlipdeps warning about symbols it can't find ?
Only if the library has a SONAME. This is intended so that
perl/python/apache modules do not generate bad warnings: they rely on the
binary dlopening them to provide the symbols (and it's okay that way).
So the problem might still be missed on some plugins without SONAME.
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