[patch] avoid ABI warnings on arm when running the libstdc++v3 testsuite

[Paolo Carlini]

On 01/15/2010 01:43 AM, Mark Mitchell wrote:
> I think it's reasonable for the compiler to issue messages of lower
> severity than warning (in this case, inform) even when using a -W
> option.  I guess we could argue that this should be a warning instead,
> but it's not something that even might represent a bug in your code.
>   
Thanks for the clarification about the lower severity and, in
particular, about the essential difference vs normal warnings that this
kind of message cannot possibly point to a bug in the user code.

Well, I would say, more reasons to suppress it in system headers,
hopefully just checking for !in_system_header works?!?

Paolo.