从 MacTeX 2015 和 2017 迁移到 MacTeX 2018 后，我的 LaTeX Beamer 文件出现问题。使用 MacTeX 2018 中的 Beamer 3.50，使用 beamerarticle 包生成文章模式输出的文件会出现错误消息，表明 xcolor 包的加载出现了问题。
MacTeX 2017（及更早版本）中 Beamer 手册 3.41 版第 21 节描述了一种从同一源文本生成文章和 Beamer 输出的方法（MacTeX 2018 中 3.50 版第 21 节中也有介绍）。我们有三个文件：
- MacTeX2018BeamerProblemC.main.tex 包含源材料以及 Beamer 和文章模式共有的序言部分
- MacTeX2018BeamerProblemC.beamer.tex 包含 Beamer 线束
- MacTeX2018BeamerProblemC.article.tex 包含文章线束
在 Beamer 线束中，我可以选择 beamer 类xcolor={x11names,svgnames}- 在文章线束中，我可以noxcolor选择 beamerarticle 包，在文件中，我使用命令加载 xcolor 包\usepackage[x11names,svgnames]{xcolor}- 我这样做是因为 beamerarticle 似乎没有与 beamer 类相同的 xcolor 选项，必须将选项传递给 xcolor - 在过去，直到 Beamer 3.41 和 MacTeX 2017 都有效。现在使用 Beamer 3.50，我在编译文章版本时收到错误，提示未定义\colorlet- beamer 版本编译方式与以前一样。
这是一个最小的文章线束。MacTeX2018BeamerProblemC.article.tex
% Structure of files based on section 21.2.2 of Beamer User Guide version 3.15
\documentclass[a4paper,12pt]{article}
\usepackage[noxcolor]{beamerarticle}
\setjobnamebeamerversion{MacTeX2018BeamerProblemC.beamer}
% ----------------------------------------------------------------------
%
% Commands particular to article mode % (fold)
%
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Color % (fold)
%
% ----------------------------------------------------------------------
% loaded here since Beamer loads it separately
% and beamerarticle loads xcolor with an option override unless you use noxcolor option
\usepackage[x11names,svgnames]{xcolor}
% End of Color % (end)
% ----------------------------------------------------------------------
% End of Commands particular to article mode % (end)
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Load main file
%
% ----------------------------------------------------------------------
% The *.main.tex file has commands that work in both article and beamer modes
\input{MacTeX2018BeamerProblemC.main}
这是一个最小的 Beamer 线束 MacTeX2018BeamerProblemC.beamer.tex
% Structure of files based on section 21.2.2 of Beamer User Guide version 3.15
\documentclass[ignorenonframetext,xcolor={x11names,svgnames}]{beamer}
% ----------------------------------------------------------------------
%
% Beamer configuration % (fold)
%
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Beamer theme macros % (fold)
%
% ----------------------------------------------------------------------
\usetheme[right,hideothersubsections]{Goettingen}
\setbeamertemplate{navigation symbols}{}
\setbeamertemplate{footline}{\hspace*{\fill}\insertframenumber{}/\inserttotalframenumber}
% End of Beamer theme macros % (end)
%
% ----------------------------------------------------------------------
% End of Beamer configuration % (end)
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Load main file
%
% ----------------------------------------------------------------------
% The *.main.tex file has commands that work in both article and beamer modes
\input{MacTeX2018BeamerProblemC.main}
这是一个示例主文件，包含 beamer 和 article 版本的主要源代码，MacTeX2018BeamerProblemC.main.tex
% The *.main.tex file has commands that work in both article and beamer modes
\usepackage{ifthen}
% ----------------------------------------------------------------------
%
% Preamble Packages & Macros % (fold)
%
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Color, Graphics, Diagrams % (fold)
%
% ----------------------------------------------------------------------
% xcolor is loaded by beamer
% End of Color, Graphics, Diagrams % (end)
% ----------------------------------------------------------------------
% Preamble Packages & Macros % (end)
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Meta data % (fold)
%
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\title{MacTeX 2018}
\subtitle{Beamer 3.50 Problem} % \subtitle only available with beamer
\author{Phil Molyneux}
\date{9 July 2018}
% End of Meta data % (end)
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% Macros & Packages for this file % (fold)
%
% ----------------------------------------------------------------------
% End of Macros & Packages for this file % (end)
% ----------------------------------------------------------------------
% ----------------------------------------------------------------------
%
% BEGIN DOCUMENT % (fold)
%
% ----------------------------------------------------------------------
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\maketitle
\tableofcontents
\section{MacTeX 2018 / Beamer 3.50 Problem} % (fold)
\label{sec:MacTeX2018Beamer350Problem}
\begin{frame}[t]\frametitle<presentation>{MacTeX 2018}
\framesubtitle<presentation>{Beamer 3.50 Problem}
\begin{itemize}
\item Moving from MacTeX 2015 and 2017 to MacTeX 2018 my LaTeX Beamer files have a problem
\item With Beamer 3.50 in MacTeX 2018, files producing article mode output have error messages indicating
something has happened to the loading of the xcolor package
\end{itemize}
\end{frame}
% section MacTeX2018Beamer350Problem (end)
\section{Creating Beamer and Article Versions} % (fold)
\label{sec:CreatingBeamerAndArticleVersions}
\begin{frame}[t]\frametitle<presentation>{Beamer}
\framesubtitle<presentation>{Creating Beamer and Article Versions}
\begin{itemize}
\item Section 21 of the Beamer manual version 3.41 in MacTeX 2017 (and earlier)
describe a way of producing article and Beamer output from the same source text
\item We have three source files:
\item \textbf{MacTeX2018BeamerProblemC.main.tex} which contains the source material and the part of the preamble common
to both Beamer and article modes
\item \textbf{MacTeX2018BeamerProblemC.beamer.tex} wich contains the Beamer harness
\item \textbf{MacTeX2018BeamerProblemC.article.tex} which contains the article harness
\item This is described in section 21.2.2 of the Beamer manual version 3.41
\end{itemize}
\end{frame}
% section CreatingBeamerAndArticleVersions (end)
\section{Dummy Section 1} % (fold)
\label{sec:DummySection1}
\begin{frame}[t]\frametitle<presentation>{Beamer 3.50 Problem}
\framesubtitle<presentation>{Dummy Section 1}
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{frame}
% section DummySection1 (end)
\section{Dummy Section 2} % (fold)
\label{sec:DummySection2}
\begin{frame}[t]\frametitle<presentation>{Beamer 3.50 Problem}
\framesubtitle<presentation>{Dummy Section 2}
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{frame}
% section DummySection2 (end)
\section{Dummy Section 3} % (fold)
\label{sec:DummySection3}
\begin{frame}[t]\frametitle<presentation>{Beamer 3.50 Problem}
\framesubtitle<presentation>{Dummy Section 3}
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{frame}
% section DummySection3 (end)
\section{Dummy Section 4} % (fold)
\label{sec:DummySection4}
\begin{frame}[t]\frametitle<presentation>{Beamer 3.50 Problem}
\framesubtitle<presentation>{Dummy Section 4}
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{frame}
% section DummySection4 (end)
\section{Dummy Section 5} % (fold)
\label{sec:DummySection5}
\begin{frame}[t]\frametitle<presentation>{Beamer 3.50 Problem}
\framesubtitle<presentation>{Dummy Section 5}
\begin{itemize}
\item Point 1
\item Point 2
\item Point 3
\end{itemize}
\end{frame}
% section DummySection5 (end)
% Uncomment below for bibliography
% \renewcommand{\refname}{References} % default is References
% \nocite{}
% \bibliographystyle{myplain} % myplain is produced by natbib and merlin
% \bibliography{web,computing}
% \addcontentsline{toc}{section}{References} % default is not in toc
\end{document}
% END DOCUMENT % (end)
% ----------------------------------------------------------------------
以下是本文版本的日志文件 MacTeX2018BeamerProblemC.article.log 的副本 - 未定义\colorlet错误发生在日志文件的第 87 行左右
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我的解决方法是恢复到 MacTeX 2017，此时错误不会发生，并且 Beamer 和文章版本的输出都很好 - 然而看起来 Beamer 3.41 和 3.50 版本之间确实发生了意外变化 - 还有其他人观察到这种行为吗？
答案1
解决方法：在 beamer 之前加载 xcolor 包
\documentclass[a4paper,12pt]{article}
\usepackage[x11names,svgnames]{xcolor}
\usepackage[noxcolor]{beamerarticle}
\begin{document}
test
\end{document}
或者首先不要抑制 beamer 加载 xcolor 包：
\documentclass[a4paper,12pt]{article}
\PassOptionsToPackage{x11names,svgnames}{xcolor}
\usepackage{beamerarticle}
\begin{document}
test
\end{document}
编辑于 2018/4/8
同时这个问题已经在 beamer 开发版本中修复，参见提交https://github.com/josephwright/beamer/pull/486/commits/28f1a1dfd5b9b105d3d427e5889fe732351a922d
我认为这将包含在 Beamer 版本 >=3.51 中