[patch libstdc++ testsuite]: Add new option dg-additional-options and make use of it for mingw targets

[Mike Stump]

On Mar 22, 2013, at 1:31 AM, Kai Tietz <ktietz70@googlemail.com> wrote:
> this patch adds option dg-additional-options for libstdc++-v3's testsuite and
> make use of this option for some mingw-tests.  Those tests are just possible for
> pe-coff for static-library use.  The shared version for pe-coff is
> finally linked and therefore
> no override of operators is possible within DLL.

> Ok for apply?

So, don't know if the libstdc++ want to ponder this any, but let me approve it, subject to overrides from the libstdc++ people and invite them to say if they like the general idea or if they like some other way to resolve the issue.