[Bug c++/88173] `std::numeric_limits::quiet_NaN()` is not constexpr

[g...@christoph-conrads.name]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88173

--- Comment #2 from Christoph Conrads <g...@christoph-conrads.name> ---
Created attachment 45076
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45076&action=edit
Code pre-processed with GCC 6.3.0 on Raspbian 9.4

The file was created with
$ g++ -Wextra -Wall -std=c++11 -pedantic --save-temps nan.cpp
on Raspbian 9.4 (codename stretch).