Overfull \hbox warnings for the glossary option "style=long" when using KOMA-Script?

Question

I always get an overfull \hbox warning when I compile a glossary with the glossaries package and the option style=long. Also the warning occurs only with KOMA-Script classes and not with the standard classes. Normally I'm using lualatex, but pdflatex produces the same warnings. When I have more than 10 acronyms I get a similar second overfull \hbox warning.

Does anyone have an idea what the problem is? Or do I just have to live with it?

Here a MWE which produces the warnings:

 \documentclass{scrartcl}
%\documentclass{article}

 \usepackage[nomain,acronym,xindy,style=long]{glossaries}

 \makeglossaries

\newacronym{a}{a}{a}
\newacronym{b}{b}{b}
\newacronym{c}{c}{c}
\newacronym{d}{d}{d}
\newacronym{e}{e}{e}
\newacronym{f}{f}{f}
\newacronym{g}{g}{g}
\newacronym{h}{h}{h}
\newacronym{i}{i}{i}
\newacronym{j}{j}{j}
\newacronym{k}{k}{k}
%\newacronym{l}{l}{l}
%\newacronym{m}{m}{m}
%\newacronym{n}{n}{n}
%\newacronym{o}{o}{o}
%\newacronym{p}{p}{p}

\begin{document}
\glsaddallunused[\acronymtype]
\printglossary[type=\acronymtype,]
\end{document} 

Answer 1

See this bug report for package glossaries. The package glossaries uses \hsize before \begin{document} while the official setup is done after calculation of \columnwidth in \begin{document}. Note that the MWE in the bug report is using the standard class article.

Workaround for style=long:

\usepackage[nomain,acronym,xindy,style=long]{glossaries}
\AtBeginDocument{%
  \setlength{\glsdescwidth}{.6\columnwidth}%
  \setlength{\glspagelistwidth}{.1\columnwidth}%
}

Code:

\documentclass{scrartcl}
%\documentclass{article}

\usepackage[nomain,acronym,xindy,style=long]{glossaries}
\AtBeginDocument{%
  \setlength{\glsdescwidth}{.6\columnwidth}%
  \setlength{\glspagelistwidth}{.1\columnwidth}%
}

\makeglossaries

\newacronym{a}{a}{a}
\newacronym{b}{b}{b}
\newacronym{c}{c}{c}
\newacronym{d}{d}{d}
\newacronym{e}{e}{e}
\newacronym{f}{f}{f}
\newacronym{g}{g}{g}
\newacronym{h}{h}{h}
\newacronym{i}{i}{i}
\newacronym{j}{j}{j}
\newacronym{k}{k}{k}
\newacronym{l}{l}{l}
\newacronym{m}{m}{m}
\newacronym{n}{n}{n}
\newacronym{o}{o}{o}
\newacronym{p}{p}{p}

\begin{document}
\glsaddallunused[\acronymtype]
\printglossary[type=\acronymtype,]
\end{document}

Update The bug is fixed in glossaries-extra. This new package is an extension of glossaries. So you can use

\usepackage[nomain,acronym,xindy,style=long]{glossaries-extra}

Answer 2

Nicola Talbot implemented this fix in the package glossaries-extra

\usepackage[nomain,acronym,xindy,style=long]{glossaries}
\usepackage{glossaries-extra}