I've got a Greek-only font (no Latin characters) that polyglossia none the less refuses to recognize as a Greek font!

Minimum example:
Code: Select all
\documentclass[a5paper, openany, 10pt]{book}
\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text}
\setmainfont{GFS Didot Classic}
\usepackage{polyglossia}
\setmainlanguage[variant=poly]{greek}
\begin{document}
Ἤμουν στὸ σπίτι μου ἐγὼ.
\end{document}
The error message I get is the following:
Code: Select all
! Package polyglossia Error: The current roman font does not contain the Greek script!
(polyglossia) Please define \greekfont with \newfontfamily.
See the polyglossia package documentation for explanation.
Type H <return> for immediate help.