[Bug c++/80265] __builtin_{memcmp,memchr,strlen} are not usable in constexpr functions

[palves at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80265

--- Comment #18 from Pedro Alves <palves at redhat dot com> ---
I sent a patch using the __builtin_constant_p idea:
 https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00983.html