[Bug libstdc++/95289] [10/11 Regression] __gnu_debug::__get_distance is not C++11 constexpr compliant

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95289

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jonathan Wakely
<r...@gcc.gnu.org>:

https://gcc.gnu.org/g:3ba391077d41324f6c0585f0ec76be0f44dd5b43

commit r10-8172-g3ba391077d41324f6c0585f0ec76be0f44dd5b43
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Sat May 23 18:29:33 2020 +0100

    libstdc++: Fix function that can't be constexpr in C++11 (PR 95289)

    The body of this function isn't just a return statement, so it can't be
    constexpr until C++14.

    Backport from mainline
    2020-05-23  Jonathan Wakely  <jwak...@redhat.com>

            PR libstdc++/95289
            * include/debug/helper_functions.h (__get_distance): Only declare
            as a constexpr function for C++14 and up.
            * testsuite/25_algorithms/copy/debug/95289.cc: New test.