Re: [Bug dynamic-link/16805] dynamic library not getting reinitialized on multiple calls to dlopen()

[OndÅej BÃlka <neleai at seznam dot cz>]

On Tue, Apr 22, 2014 at 03:42:13PM +0000, davejohansen at gmail dot com wrote:
> https://sourceware.org/bugzilla/show_bug.cgi?id=16805
> 
> --- Comment #2 from Dave Johansen <davejohansen at gmail dot com> ---
> It's unclear what the plan of action is from that last comment. Is this issue
> going to be fixed?
> 
> I realize that dlclose() only states an intent, but the fact remains that
> glibc/gcc is generating code that is doing the wrong thing. The same code built
> with clang++, the Intel C++ compiler and older versions of g++ do the right
> thing and I don't see why more current versions of gcc shouldn't do the right
> thing as well.
>
That is problem at gcc part, why it added unique symbol there.
 
> >From reading the comments on the gcc bugzilla and revision history of this
> change, it appears that it was made as an optimization to improve performance.
> Optimizations are great but they shouldn't be allowed to stick around if they
> introduce incorrect behavior and in this case it appears that this is a
> regression and that the optimization needs to be fixed or reverted.
>
Problem is that this is not optimization but by lack of optimization, so
it could not be easily reverted.

What Jason proposed needs change in linker and migth not work, I will
ask in gcc bug for clarification.