C++ exceptions with pragma GCC visibility(hidden)

[Steve Magoun <steve@xxxxxxxxxx>]

I'm using some thirdparty code that (greatly simplified) looks like the 
following:
-bash-3.00$ cat ExceptionTest.cpp
#pragma GCC visibility push(hidden)
void foo() {
  throw 1;
}

That sample can't be linked into a shared library:
-bash-3.00$ c++ -o ExceptionTest.o -c -fPIC ExceptionTest.cpp
-bash-3.00$ c++ -shared -o libexceptiontest.so  ExceptionTest.o
/usr/bin/ld: ExceptionTest.o(.text+0x2f): unresolvable relocation 
against symbol `typeinfo for int@@CXXABI_1.3'
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: ld returned 1 exit status

Removing the pragma solves the problem, as does changing the visibility 
of the throw:
#pragma GCC visibility push(default)
  throw 1;
#pragma GCC visibility pop

I'd expect the throw to work regardless of the visibility of the 
containing function, although that's clearly not the case. Is that a 
bad assumption? If so, why? My C++ is pretty rusty so I'm not too clear 
on what's going on. My best guess: GCC creates a typeinfo with hidden 
visibility for the exception type. That typeinfo is the same as the 
default typeinfo for int (int@@CXXABI_1.3) (where is that defined? 
libstdc++?). The linker sees the typeinfo is hidden in ExceptionTest.o 
and overrides the default visibility ("default") for that typeinfo. Is 
this correct? <http://www.nedprod.com/programs/gccvisibility.html> 
discusses something very similar, although it indicates runtime rather 
than linker errors.

Is this a GCC problem? Bug 20297 
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20297> sounds similar; is 
"throw" a built-in function? Bug 19664 
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19664>, on the other hand, 
suggests a problem in libstdc++.


I'm using Fedora Core 3, which contains the visibility patch backported 
from GCC 4.0:
-bash-3.00$ uname -a
Linux xxx.pepper.com 2.6.10-1.770_FC3smp #1 SMP Thu Feb 24 14:20:06 EST 
2005 i686 i686 i386 GNU/Linux

-bash-3.00$ gcc -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man 
--infodir=/usr/share/info --enable-shared --enable-threads=posix 
--disable-checking --with-system-zlib --enable-__cxa_atexit 
--disable-libunwind-exceptions --enable-java-awt=gtk 
--host=i386-redhat-linux
Thread model: posix
gcc version 3.4.3 20050227 (Red Hat 3.4.3-22.fc3)
gcc version 3.4.3 20050227 (Red Hat 3.4.3-22.fc3)

-bash-3.00$ ld -v
GNU ld version 2.15.92.0.2 20040927


Any insight would be greatly appreciated.

Thanks,
Steve