usefulness of UCLIBC_CTOR_DTOR ?

[John Spencer]

On 08/12/2011 07:53 PM, Lennart Sorensen wrote:
>
> C libraries can have constructors and destructors too.
>
> But if you don't need them (and a lot of code doesn't) then you probably
> get a smaller uclibc by turning them off.

how would i link my binaries, when gcc complains about those objects 
being missing?
and what kind of code would need them ?

-- J.S.