[Bug c++/53930] bug in linker

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53930

--- Comment #10 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-12 12:18:11 UTC ---
(In reply to comment #9)
> Correction of typo:
> ...So I actually do not redefine std::string again, I just USE the type defined
> in third file.

Preprocessing makes the std::string definition from <string> part of your
compilation unit, so you _do_ redefine it.