[Bug libstdc++/79702] AX_CXX_COMPILE_STDCXX([17]) does not work with GCC=7.0.1

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79702

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-02-24
                 CC|                            |trippels at gcc dot gnu.org,
                   |                            |ville.voutilainen at gmail dot com
          Component|c++                         |libstdc++
     Ever confirmed|0                           |1

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
It is a libstdc++ issue. It works fine with e.g. -stdlib=libc++.