https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116070
--- Comment #15 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-14 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:9ba75a628e0214eb08673f1572c6fd06fe553525 commit r14-10530-g9ba75a628e0214eb08673f1572c6fd06fe553525 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. (cherry picked from commit 6c22fe418cff57dad712c4b950638e6e2d09bd9c)
