[patch] New std::string implementation

[Jonathan Wakely]

On 18/11/14 10:45 +0100, Richard Biener wrote:
>Looking at all these issues that just pop up inside libstdc++ I wonder
>if this whole business will not blow up in our face once out in the wild...

I'm trying to ensure that most of the the pain is dealt with inside
libstdc++ and so users won't have the same kind of issues.

I've got to the point where everything works except programs which use
custom facets. If you create a custom locale with a user-defined facet
in a translation unit that uses the new ABI and imbue an iostream with
that locale, your user-defined facet will not be used, because the
iostream definitions are instantiated in the library using the old
ABI. I've never met anyone who uses custom facets, but that doesn't
mean it's OK for them to not work properly using  the new ABI.

So if I add dg-options "-D_GLIBCXX_USE_CXX11_ABI" to the last 40 tests
that are failing, everything passes. Maybe that's what I should do for
now.