No warning of multiple labels with the same name

[rafael-copat]

I used to get a warning when two labels (\label{}) would have the same name, but I no longer do. When referring (\ref{}) the label, the hyperref package seems to take the latter of the two labels. The warning would be helpful to prevent mistakes.

[deathaxe]

Assuming this report is about build output, the following latex file ...

\documentclass[a4paper]{book}
\usepackage{hyperref}

\begin{document}

\section{A Section}
\label{a-section}

This is intro of section A.

\section{B Section}
\label{a-section}

This is intro of section B.

\section{C Section}

see: \ref{a-section}

\end{document}

creates following build output on my box using TeXLive 2025 / ST4199 / LaTeXTools v4.5.8

[Compiling 'debug.tex' with 'Traditional Builder']
Engine: pdflatex.
running latexmk...done

No errors. Warnings:

debug.aux: Label `1.2.4:test' multiply defined
debug.tex: There were multiply-defined labels

debug.log:1: Double-click here to open the full log.

[Finished in 0.5s]

LaTeXTools prints all errors and warnings, it is able to extract from latex logfile.

So either no warnings were created by latex compiler or LaTeXTools was not able to find them in the logfile.

As log parser relies on syntax highlighting, please open the latex build log, search the warning and make sure it is highlighted (scoped markup.warning) and/or look out for any highlighting issues.

If either warning in question is not highlighted, or syntax errors can be found, the logfile in question would be needed for further investigation on why parsing fails.

[rafael-copat]

@deathaxe, thank you for testing! I do see the following message in the log file: LaTeX Warning: There were multiply-defined labels. I am trying to pin down what causes the warning not to show up in the build output. It seems the issue is whether there is a space in the file name. For example, I get the warning if the file name is testing.tex, but I do not get the warning if the file name is testing file.tex. I am using Windows 11, ST 4200, LaTeXTools 4.5.8.

[deathaxe]

Appears MikTeX is creating logfiles with unquoted filenames.

(test file.tex
...

Logfile syntax currently expects files to be quoted, if whitespace is present.

("test file.tex"
...

Needs some changes to LaTeXTools Log.sublime-syntax to fix it.