[Bug libstdc++/81542] Compilation failure with math.h and -D_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81542

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Why are you defining _GLIBCXX_USE_C99_FP_MACROS_DYNAMIC on the command line?