[Bug c++/66943] GCC warns of Unknown Pragma for OpenMP, even though it support it.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66943

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The warning is correct though, maybe it should add a message about needing
-fopenmp to have them to be known.