Page Layout ⇒ titlesec creates "Unsynchronized" warning

[bombcar]

I have:

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\documentclass[b5paper]{book}
\usepackage{titlesec}
\titleformat{name=\section,page=odd}
	{\normalfont\Large\bfseries}{\thesection}{1em}{}
\titleformat{name=\section,page=even}
	{\normalfont\Large\bfseries}{\thesection}{1em}{}
\begin{document}
\section{A Section}
\end{document}

This causes:

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LaTeX Warning: Unsynchronized `section' title on page 1.

but I cannot figure out why it is complaining. The only thing I can do to get rid of it is get rid of the page=even parts; but that's the whole point.

The side effect of this seems to be that it can throw the package out of whack; if I use a \section* command before a \section, it'll think it's on an even page on page 3!

[gmedina]

Hi bombcar,

the warning will disappear after a second compilation of the document. The warning message reminds the user that a second run is necessary, due to the asynchronous mechanism that TeX uses for building pages.

The titlesec documentation also mentions this:

Since the page information is written to the aux file, at least two runs are necessary to get the desired result.

Regarding this:

...The side effect of this seems to be that it can throw the package out of whack; if I use a \section* command before a \section, it'll think it's on an even page on page 3!

Can you please post a minimal working example allowing us to reproduce the problem mentioned?

[bombcar]

That must be what it was; I had

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pdflatex $*
pdflatex $*
makeindex -s ../songs.ist $*.idx
pdflatex $*

I moved the second call to after the third, which seems to work.

I'm not sure why I was calling it twice before makeindex.