[XeTeX] Custom page size

[Sven Siegmund]

Hi all,

I need help with xetexing a document on a custom paper format.

As far as I understand the page layout, this minimal example should
suffice to typeset on my custom format paper. However, while the
resulting pagesize of the pdf is just as I specified, the text is not
adjusted to its smaller size. It looks like typesetting on A4 and then
cutting the pdf to my desired format. The compiler does not even
complain abou overfull hbox. What am I doing wrong in this minimal
example?

\documentclass{article}
\usepackage{xltxtra}

\setlength\paperwidth{155mm}
\setlength\paperheight{240mm}
\setlength\pdfpagewidth{\paperwidth}
\setlength\pdfpageheight{\paperheight}

\begin{document}

The resulting text will not fit on the page. Yet, when compiling,
pdflatex or xelatex do not complain about overfull hbox.

\end{document}

best regards,

S.