Example using xr package on Overleaf

Author

LianTze Lim (from an answer by cyberSingularity at http://tex.stackexchange.com/a/69832/226)

License

Creative Commons CC BY 4.0

Abstract

This project demonstrates how the xr package can be used on Overleaf to resolve labels in other .tex files that have not been \include-d in the main file.

Make sure you enable the correct system call in latexmkrc, depending on the LaTeX engine you're using!

Tags

References latexmkrc

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%%%%
% (from an answer by cyberSingularity at http://tex.stackexchange.com/a/69832/226)
%%%

\documentclass[12pt]{article}

\title{Example using xr on Overleaf}

%%%% HELPER CODE FOR DEALING WITH EXTERNAL REFERENCES
% (from an answer by cyberSingularity at http://tex.stackexchange.com/a/69832/226)
%%%

\usepackage{xcite}

\usepackage{xr}
\makeatletter
\newcommand*{\addFileDependency}[1]{% argument=file name and extension
  \typeout{(#1)}% latexmk will find this if $recorder=0 (however, in that case, it will ignore #1 if it is a .aux or .pdf file etc and it exists! if it doesn't exist, it will appear in the list of dependents regardless)
  \@addtofilelist{#1}% if you want it to appear in \listfiles, not really necessary and latexmk doesn't use this
  \IfFileExists{#1}{}{\typeout{No file #1.}}% latexmk will find this message if #1 doesn't exist (yet)
}
\makeatother

\newcommand*{\myexternaldocument}[1]{%
    \externaldocument{#1}%
    \addFileDependency{#1.tex}%
    \addFileDependency{#1.aux}%
}
%%% END HELPER CODE

% put all the external documents here!
\myexternaldocument{file2}

\begin{document}

Label1 is section \ref{label1} in file2.tex.

\end{document}