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Re: Proposed change: weak symbol support for Darwin
On Mon, Oct 13, 2003 at 06:28:21PM -0700, Matt Austern wrote:
> It's not that hard. Currently we've got four cases for polymorphic
Which really reduce to two: your case 1 where we use the cfront trick,
and everything else where we can't.
> I'm describing what the compiler currently does, by the way, not my
> And currently we make the vtable weak for all four cases.
> My proposal is to change the compiler, for Darwin only, so that it only
> makes the vtables weak for cases 2-4. I don't see any good reason to
> that change on any other platforms, but I'd be happy to do it if anyone
> think of a reason why it would be an improvement.
There's the maintainance issue: maintainers forever more will have to
ask themselves why Darwin is different, even though some other OSes
have similar issues with weak symbols.
I think that just making the change everywhere would be better.
For one thing, x86/ELF using developers will notice that they have
broken Darwin a bit earlier. :-)
In fact, anything that can be done to easily reduce the number of
special cases, multiple ways of doing things, and OS-specific tweaks
in gcc that aren't really needed will pay off in the long run.