GLU tesselator and core profiles

Having to convert some older GL code using the GLU tesselation functions, what’s the state of this on various platforms?

Can those parts of GLU which do not access OpenGL itself still be used with a core profile context and if so, on which operating systems?
I need to decide whether to roll out my own tesselation system or simply stick with GLU for it, what’s most important is to avoid some nasty surprises.