[Bug libstdc++/77413] [7 regression] experimental/numeric/gcd.cc etc. FAIL

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77413

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-08-30
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Rainer Orth from comment #0)
> I noticed that the earlier (successful) test was compiled without -include
> bits/stdc++.h, while the newer (failing) one is using that flag.  Omitting it
> manually lets the tests PASS.

Ah, this will be because -include bits/stdc++.h is in the default options, but
previously the use of { dg-options "-std=gnu++14" } would override the default
options.

Now that it uses { target c++14 } instead of dg-options it doesn't override the
default, so bits/stdc++.h is used. I wonder why the PCH breaks it.