[Bug libstdc++/116070] [13/14/15 Regression] broken headers for compile with flags -std=gnu++14 -fconcepts

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116070

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

https://gcc.gnu.org/g:6c22fe418cff57dad712c4b950638e6e2d09bd9c

commit r15-2273-g6c22fe418cff57dad712c4b950638e6e2d09bd9c
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Jul 24 11:32:22 2024 +0100

    libstdc++: Fix <ostream> and <istream> for -std=gnu++14 -fconcepts
[PR116070]

    This questionable combination of flags causes a number of errors. The
    ones in the rvalue stream overloads need to be fixed in the gcc-14
    branch so I'm committing it separately to simplify backporting.

    libstdc++-v3/ChangeLog:

            PR libstdc++/116070
            * include/std/istream: Check feature test macro before using
            is_class_v and is_same_v.
            * include/std/ostream: Likewise.