Re: [Qemu-devel] [RFC] New device API

[Paul Brook <paul@codesourcery.com>]

On Saturday 09 May 2009, Anthony Liguori wrote:
> Paul Brook wrote:
> > On Wednesday 06 May 2009, Paul Brook wrote:
> >>>> The attached patch is my attempt at a new internal API for device
> >>>> creation in qemu.
> >>>
> >>> Instead of recreating constructors, I think we should just use GCC's
> >>> constructor attribute.  This gives us ordering which will be important
> >>> when dealing with buses.
> >>
> >> The reason I'm not using constructors is because you have to workaround
> >> ordering issues. All constructors are run before main(), so there's a
> >> very limited amount they can actually do, and constructor priorities are
> >> not available on all hosts.
> >
> > Oh, the other thing is that constructors don't work when you put objects
> > in a static library.  You need am explicit dependency to pull in objects.
>
> Not if you enable -Wl,--whole-archive.  It ends up looking like:
>
> gcc -o test-stub -g -Wall -O test-stub.c -Wl,--whole-archive libtest.a
> -Wl,--no-whole-archive -L.
>
> And I've confirmed this works.

Yes, but, eww. Plus it means you've got to pull in absolutely everything, 
whether you want it or not.

Paul