Multiple FUNCTION_DECLS for __cxa_begin_catch

[Brendon Costa <bcosta at avdat dot com dot au>]

Hi again,

Getting further along with my project, I have come across yet another 
thing that I dont understand. While compiling:

libstdc++-v3/libsupc++/vec.cc

My GCC extension comes across two FUNCTION_DECL nodes that both have 
DECL_ASSEMBLER_NAME of __cxa_begin_catch

After reading some past posts it seems that the standard allows for 
multiple C functions defined extern "C" in different namespaces.

As an example of code which might do this see below:

extern "C"
{
  void Function(void) {}
}
namespace NS
{
  extern "C"
  {
     void Function(void);
  }
}

Is it safe to assume in the C++ front end that two functions declared in 
such a manner will always share the same implementation in which case it 
is kind-of like a "using" statement?

If so, is there any reason why the following code does not emit an error 
in the compiler but only in the assembler?

extern "C"
{
  void Function(void) {}
}
namespace NS
{
  extern "C"
  {
     void Function(void) {}
  }
}


Thanks,
Brendon.