Angle (degree) symbol with siunitx under XeLaTeX and mathspec

Question

Consider the following example:

\documentclass{article}
\usepackage{mathspec}
\usepackage{siunitx}

\begin{document}
\ang{30}, \SI{20}{\celsius}
\end{document}

Compiling with XeLaTex, I get:

The angle misses the degree symbol. With the package fontspec instead of mathspec it works fine (but I need mathspec).

Is there any solution?

Answer 1

\documentclass{article}
\usepackage{mathspec}
\usepackage{textcomp}
\usepackage{siunitx}

\sisetup{math-degree=\mbox{\textdegree},text-degree=\textdegree}
\sisetup{math-celsius=\mbox{\textdegree}C,text-celsius=\textdegree C}

\begin{document}
\ang{30}, \SI{20}{\celsius}
\end{document}

Answer 2

You can use the right Unicode character:

\documentclass{article}
\usepackage{amsmath}
\usepackage{mathspec}
\usepackage{siunitx}

\sisetup{
  text-degree=°,
  math-degree=\textup{°},
  text-celsius=℃,
  math-celsius=\textup{℃},
}

\begin{document}
\ang{30}, \SI{20}{\celsius}
\end{document}

With siunitx version 3 it's even simpler:

\documentclass{article}
\usepackage{amsmath}
\usepackage{mathspec}
\usepackage{siunitx}

\DeclareSIUnit{\degreeCelsius}{\textup{℃}}

\begin{document}

\ang{30}, \SI{20}{\degreeCelsius}

\end{document}