[Tex/LaTex] Define \tableofcontents in document class that doesn’t support it

document-classestable of contents

I'm required to use the sigchi document class for a paper: https://github.com/sigchi/Document-Formats/blob/master/LaTeX/sigchi.cls

I'm also required to include a table of contents on the first page, but using the standard \tableofcontents produces a stack overflow:

TeX capacity exceeded, sorry [input stack size=5000].
\@latexerr #1#2->\GenericError

Turns out a table of contents is usually prohibited in this template, as seen in the .cls file:

\def\tableofcontents{\@latexerr{\tableofcontents: Tables of contents are not
  allowed in the `acmconf' document style.}\@eha}

If I comment out this bit from the .cls file, I get an undefined control sequence error.

I guess, then, that the \tableofcontents command needs to be explicitly defined by a document class? In my case, it isn't. How do I add it? Would I be able to grab the source of the command definition from a standard article document class and stick it into my sigchi.cls? Or is there a package I could use?

EDIT

Here's a MWE with just a few sections. This will not compile as soon as you add a \tableofcontents.

\documentclass{sigchi}

\begin{document}

\section{First section}
\subsection{Subsection}

\section{Second section}

\end{document}

Best Answer

The sigchi.cls is not meant for a thesis, it misses several features necessary for typesetting a thesis (or has redefined it strangely)

The easiest way is to use a 'copy' of the \tableofcontents version provided by article.cls

Please note that the page layout is awkward, but this is another question too. 

\documentclass{sigchi}

% Perhaps useful?
%\usepackage[paper=letterpaper]{geometry}

\makeatletter
\newcommand{\contentsname}{Contents}% For example
\renewcommand{\tableofcontents}{%
  \section*{\contentsname}
  \@starttoc{toc}
}

% sigchi.cls does \let\thepage\relax (don't ask!), so define it again
\newcommand{\thepage}{\arabic{page}}

\makeatother

\begin{document}
\tableofcontents
\clearpage
\section{First section}
\subsection{Subsection}

\section{Second section}

\end{document}
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