[Bug libstdc++/69450] [6 Regression] libstdc++-v3/include/math.h:66:1 2: error: 'constexpr bool std::isnan(double)' conflicts with a previous declaration

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69450

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I can prepare a patch to do that tomorrow.