https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80265
--- Comment #41 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:69dc042f91c70458ffb6e7b147f093799cee2100 commit r10-5927-g69dc042f91c70458ffb6e7b147f093799cee2100 Author: Jason Merrill <ja...@redhat.com> Date: Fri Jan 10 15:38:34 2020 -0500 PR c++/80265 - constexpr __builtin_mem*. The library has already worked around this issue, but I was curious about why it wasn't working. The answer: because we were passing &var to fold, which doesn't know about the constexpr values hash table. Fixed by passing &"str" instead. * constexpr.c (cxx_eval_builtin_function_call): Expose STRING_CST to str/mem builtins.
