[Bug sanitizer/117731] [15 Regression] libsanitizer builds not as c++17 even though it uses c++17 features

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117731

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Haochen Jiang from comment #2)
> I also notice that but why the warning does not appear previously since it
> is always using gnu14?

because the merge (r15-5164-gfa321004f3f628) from upstream brought in the new
code.