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How can I reference a toc entry created with \addcontentsline?
\documentclass{l3doc}
\usepackage{hyperref}
\begin{document}
\tableofcontents
\addcontentsline{toc}{section}{\protect\numberline{\thesection}Foo}\label{opt:foo}
\DescribeOption{Foo}
Section~\ref{opt:foo} % Expect: % Section~0
\end{document}
\label needs the reference info in \@currentlabel, but \addcontentsline does nothing to \@currentlabel. You could do for instance:
\makeatletter
\def\@currentlabel{\p@section\thesection}%
\makeatother
or more explicitly, \makeatletter\def\@currentlabel{0}\makeatother (or another value) right before using \label to define this info, but the usual way to set \@currentlabel is to use \refstepcounter.
Since you appear to want 0 as the section number and \refstepcounter increments the counter before storing the \protected@edef-expansion of \p@<counter>\the<counter> in \@currentlabel, I use \setcounter{section}{-1} before the first \refstepcounter{section} call here.
\documentclass{l3doc}
\usepackage{hyperref}
\makeatletter
\newcommand*{\mySetNameref}{\def\@currentlabelname}
\makeatother
\begin{document}
\tableofcontents
\bigskip
% First option
\leavevmode
% The next “section” will be numbered 0
\setcounter{section}{-1}\refstepcounter{section}%
\mySetNameref{Option \texttt{Foo}}%
\label{opt:foo}%
\addcontentsline{toc}{section}{\protect\numberline{\thesection}Foo}%
\DescribeOption{Foo} Description of \texttt{Foo}
% Second option
\leavevmode
\refstepcounter{section}%
\mySetNameref{Option \texttt{Bar}}%
\label{opt:bar}%
\addcontentsline{toc}{section}{\protect\numberline{\thesection}Bar}%
\DescribeOption{Bar} Description of \texttt{Bar}
\medskip
Section~\ref{opt:foo} is named \nameref{opt:foo}. Section~\ref{opt:bar} is
named \nameref{opt:bar}.
\end{document}
Of course, you should probably wrap this in a macro to make it more automatic.
\write whatsit) is in the same horizontal box as the following option from \DescribeOption.
\DescribeOption{Foo}using\documentclass{article}, then probably more straightforward to stick tol3doc. I'm open to a contrary opinion.\changes. I have just realized that it works after exec the glo+index commands given in the*logfile' (Package l3doc Info: Generate the change,,,).