Recent libstdc++ regression on i686-linux: abi/cxx_runtime_only_linkage.cc

[Paolo Carlini]

Mark Mitchell wrote:
> Obviously, distributors can do whatever they please, but the C++
> run-time library needs to tolerate CPUs without this feature.  It can of
> course offer reduced functionality (at compile-time or at run-time) on
> CPUs without the necessary support.
>   
As far as I'm concerned, I totally agree on both accounts. Maybe was not 
clear in this thread, but I sent the original message to point-out a 
*bug*, which had to be fixed, and quickly. To be safe, while waiting for 
the fix, I even reverted completely the new feature.

Now the C++0x feature is back in, provided only for target implementing 
the atomic builtins unconditionally: it works that the corresponding 
declarations do *not exist* in <exception> if the prerequisites are not met.

Paolo.