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

[Joseph S. Myers]

On Thu, 14 Jan 2010, Paolo Carlini wrote:

> On 01/14/2010 06:54 PM, Matthias Klose wrote:
> > The attached patch runs the testsuite with -Wno-abi on arm targets. Ok
> > for the trunk and the 4.4 branch? Should the target be more restricted?
> Does not seem the right fix to me, the real issue is that *user code*
> will warn, unless the user passes -Wno-abi! How happens that a system
> header spills a warning, again? We have been working on those issues for

(a) It's a note (inform ()), not a warning; the general system header 
warning suppression may not work for those.

(b) I don't see a report of the compilation options.  Are the header 
directories in the source and build trees being properly included with 
-isystem rather than -I so they are marked as system headers?  If not, 
that's a testsuite bug.  When testing the original patch I would have been 
using installed testing, in which the headers would properly have been 
marked as system headers.  (Though I see the relevant header does indeed 
use #pragma GCC system_header, so this particular issue shouldn't have 
caused a problem.)

I definitely made sure when testing the patch that the mangling of va_list 
did not affect the libstdc++.so ABI.

-- 
Joseph S. Myers
joseph@codesourcery.com