A #pragma visibility warning from gthr.h

[Paolo Carlini]

Hi everyone,

we have got another, different, warning regression, that I don't 
understand in detail. It happens both during the build of libsupc++ and 
later, and comes from gthr.h:

In file included from 
/home/paolo/Gcc/cvs-dirs/gcc-head/gcc/libstdc++-v3/libsupc++/eh_alloc.cc:41:
/home/paolo/Gcc/cvs-dirs/gcc-head-build/i686-pc-linux-gnu/libstdc++-v3/include/i686-pc-linux-gnu/bits/gthr.h:32: 
warning: ignoring #pragma _GLIBCXX_GCC visibility
In file included from 
/home/paolo/Gcc/cvs-dirs/gcc-head/gcc/libstdc++-v3/libsupc++/eh_alloc.cc:41:
/home/paolo/Gcc/cvs-dirs/gcc-head-build/i686-pc-linux-gnu/libstdc++-v3/include/i686-pc-linux-gnu/bits/gthr.h:105: 
warning: ignoring #pragma _GLIBCXX_GCC visibility

Anyone willing to help with this one?

Thanks in advance,
Paolo.