考虑以下 MWE - 几乎与[greek] babel 和 lastpage、\frontmatter 失败？，但不完全是 - 我有一个很大的文档，我想为其生成“预编译头”（TikZ 的外部化和 mylatex（注意， \jobname 应该相同））并认为我会使用mylatexformat它（具有预编译功能的超快 pdflatex）。
该结构看起来是这样的：
setup/_preamble.tex
\documentclass[10pt]{book}
\usepackage{cmap}% (causes pdflatex: dangling objects discarded, no output file produced. with -ini/mylatexformat)
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
% \usepackage[english]{babel} % ok
\usepackage[greek,english]{babel} % ok w/ hack below
\usepackage{amsmath,amssymb}
\usepackage{csquotes}
\usepackage[backend=biber]{biblatex}
\usepackage{tikz}
\usepackage{siunitx}
\usepackage{lastpage}
\makeatletter
\let\oldlastpage@putl@bel\lastpage@putl@bel
\renewcommand*\lastpage@putl@bel{%
\bgroup
\let\textlatin\@firstofone % make \textlatin a no-op
\oldlastpage@putl@bel%
\egroup
}
\makeatother
test.tex
%% This is the file `test.tex'
%
\input{setup/_preamble.tex}%
%
% \csname endofdump\endcsname% may \def to \relax; https://tex.stackexchange.com/questions/57398
\ifcsname endofdump\endcsname%
% it is called with precompiled header; stop here:
\typeout{HEEEREEEE: endofdump defined!}%
\endofdump% shouldn't be here?
\typeout{HEEEREEEE: POST endofdump defined!}%
\else%
\fi%
\usepackage{lipsum}
\begin{document}
\frontmatter
\clearpage
\section{Something}
\lipsum[1-5]
\end{document}
如果我用它来编译它pdflatex test.tex，它可以编译成功。
test.fmt我像这样“编译”文件：
$ pdflatex -ini -jobname="test" "&pdflatex" mylatexformat.ltx "test.tex"
This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014) (INITEX)
...
HEEEREEEE: endofdump defined!
<<ot1.cmap>><<oml.cmap>><<oms.cmap>><<omx.cmap>> ...
(\end occurred when \ifcsname on line 6 was incomplete)
Beginning to dump on file test.fmt
(preloaded format=test 2015.2.18)
...
20 words of pdfTeX memory
...
...看起来效果不错。
但是当我尝试.pdf使用.fmt这样的预编译文件来构建文件时（我没有将注释%&test作为文件的第一行test.tex，而是在命令行上指定它）：
$ pdflatex --file-line-error --synctex=1 "&test" test.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014) (preloaded format=pdflatex)
...
==============================================================================
JOB NAME : "test"
CUSTOMISED FORMAT: "test"
PRELOADED FILES:
setup/_preamble.tex
...
t1cmtt.fd 2014/09/29 v2.5h Standard LaTeX font definitions
t1cmss.fd 2014/09/29 v2.5h Standard LaTeX font definitions
==============================================================================
(mylatexformat)Info: start reading document "test"
(mylatexformat) on input line 13. (\endofdump)
==============================================================================
(./setup/_preamble.tex
./setup/_preamble.tex:1: LaTeX Error: Two \documentclass or \documentstyle commands.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.1 \documentclass[10pt]{
book}
?
... 因为某些原因，甚至如果预编译.fmt文件已加载，TeX仍然开始读取- 并因此报告“两个命令”setup/_preamble.tex的错误？\documentclass
我已经知道解决办法——删除\inputin周围的注释百分号字符test.tex：
%% This is the file `test.tex'
\input{setup/_preamble.tex}
% \csname endofdump\endcsname% may \def to \relax; https://tex.stackexchange.com/questions/57398
...
...然后使用预编译.fmt文件（pdflatex "&test" test.tex）运行构建就可以了。
我的问题是——为什么序言中的评论会对解析过程产生影响mylatexformat？