Re: DSO linking changes for wheezy
On Sun, Nov 07, 2010 at 04:19:10PM +0000, Roger Leigh wrote:
> On Fri, Oct 29, 2010 at 03:43:57PM +0200, Matthias Klose wrote:
> > For wheezy I'm planning to change the linking behaviour for DSOs (turning
> > on --as-needed and --no-copy-dt-needed-entries. The rationale is
> > summarized in http://wiki.debian.org/ToolChain/DSOLinking. I would like
> > to know about issues with these changes on some of the Debian ports, and
> > if we need to disable one of these changes on some port.
> While I understand the rationale for --no-copy-dt-needed-entries for
> preventing encapsulation violations via indirect linking, I don't agree
> with the use of --as-needed *at all*. If a library has been explicitly
> linked in, it shouldn't be removed. This is an issue for fixing in
> individual packages, not in the toolchain.
> I can understand on using it on a per-package basis, but not in the
> actual toolchain defaults. The compiler and linker *should not be
> second-guessing the user*. This can break perfectly legitimate code
> making use of ELF constructors and other features which won't be
> picked out just by looking at symbol usage.
People have been claiming that constructors or init section are a
possible problem. I have yet to see an example where it breaks.