[Bug bootstrap/70519] genmatch fails to compile under gcc-5.2.0 - missing '-lstdc++' .

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70519

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
xg++ from stage1 should already add -lstdc++.  Sth else weird is going on for
you.