Remove empty pages before glossary

Question

I would like to have "subsections" in my glossary, or simply two glossaries one after the other. However, I always get an empty page (or, because I am using twoside & openright, even two!) between the glossaries.

I found the following topic

Remove Page Break Before Glossary

where the short version is (I think) that any "chapter" based class will introduce a clearpage, which I should be able to remove using

\renewcommand*{\glsclearpage}{}

That does not work for me though, or I am not calling it correctly.

I created the following mini-example:

\documentclass[11pt,a4paper,twoside,openright]{scrreprt}

% Include Glossary Package
\usepackage[style=alttree,nonumberlist,acronym]{glossaries}
\glssetwidest{ABCD}% widest name
\renewcommand*{\glsclearpage}{}

% Create Glossaries
\newglossary{type1}{gls1}{glo1}{Glossary 1}
\newglossary{type2}{gls2}{glo2}{Glossary 2}

% Generate Glossary Entries
\newglossaryentry{Entry1}{type = type1, name = $aaaa$, description = Position}
\newglossaryentry{Entry2}{type = type1, name = $bbbb$, description = Velocity}
\newglossaryentry{Entry3}{type = type2, name = $cccc$, description = Position}
\newglossaryentry{Entry4}{type = type2, name = $dddd$, description = Velocity}

% Generate Glossaries
\makeglossaries


\begin{document}

% Print Glossaries
\glsaddall
\printglossary[type=type1]
\printglossary[type=type2]

\end{document} 

What am I doing wrong?

Thanks a lot! Cheers

---

EDIT, SOLUTION: Using the suggestions below, this is how I achieved to have a main glossary chapter with some specific glossary "sections".

\documentclass[11pt,a4paper]{scrreprt}

% Include Glossary Package
\usepackage[toc,style=alttree,nonumberlist,acronym,section=section]{glossaries}
\glssetwidest{ABCD}% widest name[![enter image description here][2]][2]

% Create Glossaries
\newglossary{type1}{gls1}{glo1}{Accronyms}
\newglossary{type2}{gls2}{glo2}{Nomenclature}

% Generate Glossary Entries
\newglossaryentry{Entry1}{type = type1, name = $aaaa$, description = Position}
\newglossaryentry{Entry2}{type = type1, name = $bbbb$, description = Velocity}
\newglossaryentry{Entry3}{type = type2, name = $cccc$, description = Position}
\newglossaryentry{Entry4}{type = type2, name = $dddd$, description = Velocity}

% Generate Glossaries
\makeglossaries
\glsaddall

\begin{document}

\tableofcontents

% First, start main glossary chapter
\addchap{My Glossaries}
Some introductory text if desired.
% Now print actual glossaries
\printglossary[type=type1]
\printglossary[type=type2]
\bigskip\noindent
Some concluding text if desired.

\end{document} 

(I only removed the "twoside,openright" options to have a shorter output for the forum, this has no other influence)

Answer 1

You could use option section or section=section for the glossaries package. Then the glossaries get headings on level section.

    \documentclass[11pt,a4paper,twoside,openright]{scrreprt}
    % Include Glossary Package
    \usepackage[style=alttree,nonumberlist,acronym,
        section=section% <- added
    ]{glossaries}
    \glssetwidest{ABCD}% widest name
    % Create Glossaries
    \newglossary{type1}{gls1}{glo1}{Glossary 1}
    \newglossary{type2}{gls2}{glo2}{Glossary 2}
    % Generate Glossary Entries
    \newglossaryentry{Entry1}{type = type1, name = $aaaa$, description = Position}
    \newglossaryentry{Entry2}{type = type1, name = $bbbb$, description = Velocity}
    \newglossaryentry{Entry3}{type = type2, name = $cccc$, description = Position}
    \newglossaryentry{Entry4}{type = type2, name = $dddd$, description = Velocity}
    % Generate Glossaries
    \makeglossaries
    \begin{document}
    % Print Glossaries
    \glsaddall
    \printglossary[type=type1]
    \printglossary[type=type2]
    \end{document} 

If the glossary heading should be on chapter level you could use the KOMA-Script command \RedeclareSectionCommand to change the style for chapter locally to section. Then there is no page break while the glossary heading is still on level chapter using the font element chapter and having the same spaces before and after the heading. This workaround needs at least KOMA-Script version 3.18 (current is 3.19a).

    \documentclass[11pt,a4paper,twoside,openright]{scrreprt}
    % Include Glossary Package
    \usepackage[style=alttree,nonumberlist]{glossaries}
    \glssetwidest{ABCD}% widest name
    % Create Glossaries
    \newglossary{type1}{gls1}{glo1}{Glossary 1}
    \newglossary{type2}{gls2}{glo2}{Glossary 2}
    % Generate Glossary Entries
    \newglossaryentry{Entry1}{type = type1, name = $aaaa$, description = Position}
    \newglossaryentry{Entry2}{type = type1, name = $bbbb$, description = Velocity}
    \newglossaryentry{Entry3}{type = type2, name = $cccc$, description = Position}
    \newglossaryentry{Entry4}{type = type2, name = $dddd$, description = Velocity}
    % Generate Glossaries
    \makeglossaries
    \begin{document}
    % Print Glossaries
    \glsaddall
    \begingroup
        \RedeclareSectionCommand[style=section,indent=0pt]{chapter}
        \printglossary[type=type1]
        \printglossary[type=type2]
    \endgroup
    \chapter{Chapter}
    \end{document} 

Note that the command \glsaddall inserts in both examples additional horizontal space before the heading of the first glossary. Therefore see also cfr's answer.

---

If you remove the blank pages before the first glossary using cfr's answer it is also possible to remove the empty page between the glossaries: use \KOMAoptions{open=any} locally.

\documentclass[11pt,a4paper,twoside,openright]{scrreprt}
\usepackage{showframe}

% Include Glossary Package
\usepackage[style=alttree,nonumberlist]{glossaries}
\glssetwidest{ABCD}% widest name
% Create Glossaries
\newglossary{type1}{gls1}{glo1}{Glossary 1}
\newglossary{type2}{gls2}{glo2}{Glossary 2}
% Generate Glossary Entries
\newglossaryentry{Entry1}{type = type1, name = $aaaa$, description = Position}
\newglossaryentry{Entry2}{type = type1, name = $bbbb$, description = Velocity}
\newglossaryentry{Entry3}{type = type2, name = $cccc$, description = Position}
\newglossaryentry{Entry4}{type = type2, name = $dddd$, description = Velocity}
% Generate Glossaries
\makeglossaries\glsaddall% < see https://tex.stackexchange.com/a/300060/43317
\begin{document}
% Print Glossaries
\begingroup
    \KOMAoptions{open=any}
    \printglossary[type=type1]
    \printglossary[type=type2]
\endgroup
\chapter{First Chapter}
\chapter{Second Chapter}
\end{document} 

Answer 2

There are several possible things you might want here:

1. the glossaries to be sections, rather than chapters;
2. the glossaries to be chapters but with a custom format which does not insert blank pages as other chapters do;
3. the glossaries to be chapters but not to have additional blank pages before the first glossary when the glossaries are the only thing in the document.

esdd's answer addresses the first two possibilities.

In the third case, the problem is that \glsaddall appears to get counted as content, even though nothing is actually typeset. I'd consider this a bug: it ought not cause this behaviour, as far as I can see.

However, I didn't look into this further as there's an easy solution: use the command in the preamble rather than the document and all is well.

\documentclass[11pt,a4paper,twoside,openright]{scrreprt}
\usepackage[style=alttree,nonumberlist,acronym]{glossaries}
\glssetwidest{ABCD}% widest name
\renewcommand*{\glsclearpage}{}

\newglossary{type1}{gls1}{glo1}{Glossary 1}
\newglossary{type2}{gls2}{glo2}{Glossary 2}

\newglossaryentry{Entry1}{type = type1, name = $aaaa$, description = Position}
\newglossaryentry{Entry2}{type = type1, name = $bbbb$, description = Velocity}
\newglossaryentry{Entry3}{type = type2, name = $cccc$, description = Position}
\newglossaryentry{Entry4}{type = type2, name = $dddd$, description = Velocity}

\makeglossaries
\glsaddall

\begin{document}

\printglossary[type=type1]
\printglossary[type=type2]

\end{document}