llvm dev - Jun 2014 - [LLVMdev] -fvisibility=hidden, and typeinfo, and type-erasure

Le 5 juin 2014 à 00:32, Rafael Espíndola <rafael.espindola at gmail.com> a
écrit :
> I think the difference is actually in the c++ library. It looks like
> libstdc++ changed to always use strcmp of the typeinfo names:
> 
> https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=149964
> 
> Should we do the same with libc++?
What do people think about this issue?

On Fri, Jun 13, 2014 at 08:34:03PM +0200, Akim Demaille
wrote:
> 
> Le 5 juin 2014 à 00:32, Rafael Espíndola <rafael.espindola at
gmail.com> a écrit :
> 
> > I think the difference is actually in the c++ library. It looks like
> > libstdc++ changed to always use strcmp of the typeinfo names:
> > 
> > https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=149964
> > 
> > Should we do the same with libc++?
> 
> What do people think about this issue?
As I wrote earlier, the GCC change is plainly wrong and libc++ works
exactly as intended.

Joerg

On Sat, Jun 14, 2014 at 6:15 AM Joerg Sonnenberger <joerg at
britannica.bec.de>
wrote:
> On Fri, Jun 13, 2014 at 08:34:03PM +0200, Akim Demaille wrote:
> >
> > Le 5 juin 2014 à 00:32, Rafael Espíndola <rafael.espindola at
gmail.com> a
> écrit :
> >
> > > I think the difference is actually in the c++ library. It looks
like
> > > libstdc++ changed to always use strcmp of the typeinfo names:
> > >
> > > https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=149964
> > >
> > > Should we do the same with libc++?
> >
> > What do people think about this issue?
>
> As I wrote earlier, the GCC change is plainly wrong and libc++ works
> exactly as intended.
>
>
I ran into this problem when trying to move a big proprietary code base to
use libc++ on ubuntu linux. It took me a few days until I found this mail
thread.  I have not yet found a proper way to work-around this difference
in behavior between libstdc++ and libc++.

My code base depends on a lot of third party libraries and patching those
with visibility-attributes is beyond the scope of what I can do.

Are there any other options for making libc++ work on linux when using
-fvisibility=hidden?

I'm building llvm/clang/libc++ from head-of-tree.

/J

> Joerg
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