考慮以下 MWE - 幾乎與[希臘文] babel 和lastpage 失敗，\frontmatter？，但不完全是 - 我有一個大文檔，我想為其生成“預編譯頭”（TikZ的外化和mylatex（注意，\jobname 應該是相同的））並認為我會用mylatexformat它（帶預編譯的超快 pdflatex）。
結構看起來像這樣：
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 編譯它pdflatex test.tex，它編譯得很好。
test.fmt我像這樣「編譯」檔：
$ 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
...
....這似乎工作正常。
但是，當我嘗試.pdf使用.fmt這樣的預編譯文件來建立文件時（我不將%&test註釋包含在文件的第一行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}
?
.... 因為某些原因，甚至如果預編譯.fmt檔被加載，TeX仍然從 - 開始讀取，從而報告“兩個命令”setup/_preamble.tex的錯誤？\documentclass
我已經知道修復方法 - 它是刪除\inputin周圍的註釋百分比字元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
...
....然後使用預編譯.fmt檔（pdflatex "&test" test.tex）運行建置就可以了。
我的問題是 - 為什麼序言中的註解會對 的解析過程產生影響mylatexformat？