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The following code prodcues the warning "pdfTeX warning (ext4): destination with the same identifier (name{page.1}) has been already used, duplicate ignored". How to resolve this warning has been described in the answers to another question.

\documentclass[titlepage]{article}
\usepackage{hyperref}

\title{Test}
\author{Me}


\begin{document}
    \maketitle
    abc
\end{document}

This warning is not reported by latexrun or TeXstudio. I am wondering whether it is not recognized because of the bracket which is printed in front of the warning. On stdout it looks like this:

]pdfTeX warning (ext4): destination with the same identifier (name{page.1}) has
 been already used, duplicate ignored

In the log file the bracket is not present. Is it intended that the output on stdout and in the log file are different? Does the bracket have a meaning?

This happens when running pdflatex, xelatex does not give a warning. Why does xelatex not report a warning?

jakun
  • 5,981

1 Answers1

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the bracket is also in the log, it is the closing bracket from the page output starting with [1:

 [1

{c:/texlive/2020/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]pdfTeX warning (
ext4):

The warning is a low-level engine warning. If you want that texstudio or some other tool reports it, make a feature request.

xelatex can't detect duplicate destinations. But if you would compile with

 xelatex --output-driver="xdvipdfmx -vv" file

xdvipdfmx would report

 xdvipdfmx:warning: Object @page.1 already defined.
Ulrike Fischer
  • 327,261
  • interesting, in my log file the bracket is at the end of the line two lines above, not at the beginning of the line of the warning. Is there a documentation on this page output and how the output of low level warnings looks like? Is it common that low level warnings are not on a separate line? – jakun Oct 28 '20 at 13:39