昨天我被迫在电脑上重新安装 TeXLive 到最新版本 2020。但是，当使用 pdflatex 进行编译时，我没有得到与 2018 版本相同的结果。
例如，\renewcommand\bfdefault{b}似乎没有任何效果。有没有简单的方法可以实现原来的效果\renewcommand\bfdefault{b}？
我知道https://www.latex-project.org/news/latex2e-news/ltnews31.pdf据我所知，局部更改可以通过输入 来实现\fontseries{b}\selectfont。但是，我想进行全局切换，以便整个文档中的粗体字体都以非扩展粗体版本排版。
最小（非）工作示例：
\documentclass{article}
\renewcommand\bfdefault{b}
\listfiles % as suggested in the comments below
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\begin{document}
abcd \textbf{ABCd}
\end{document}
结果：
。日志档案
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020/W32TeX) (preloaded format=pdflatex 2021.2.26) 27 FEB 2021 12:38
entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
**test.tex
(./test.tex
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-03-06>
(c:/texlive/2020/texmf-dist/tex/latex/base/article.cls
Document Class: article 2019/12/20 v1.4l Standard LaTeX document class
(c:/texlive/2020/texmf-dist/tex/latex/base/size10.clo
File: size10.clo 2019/12/20 v1.4l Standard LaTeX file (size option)
)
\c@part=\count167
\c@section=\count168
\c@subsection=\count169
\c@subsubsection=\count170
\c@paragraph=\count171
\c@subparagraph=\count172
\c@figure=\count173
\c@table=\count174
\abovecaptionskip=\skip47
\belowcaptionskip=\skip48
\bibindent=\dimen134
)
(c:/texlive/2020/texmf-dist/tex/latex/base/inputenc.sty
Package: inputenc 2018/08/11 v1.3c Input encoding file
\inpenc@prehook=\toks15
\inpenc@posthook=\toks16
)
(c:/texlive/2020/texmf-dist/tex/latex/base/fontenc.sty
Package: fontenc 2020/02/11 v2.0o Standard LaTeX package
)
(c:/texlive/2020/texmf-dist/tex/latex/lm/lmodern.sty
Package: lmodern 2009/10/30 v1.6 Latin Modern Fonts
LaTeX Font Info: Overwriting symbol font `operators' in version `normal'
(Font) OT1/cmr/m/n --> OT1/lmr/m/n on input line 22.
LaTeX Font Info: Overwriting symbol font `letters' in version `normal'
(Font) OML/cmm/m/it --> OML/lmm/m/it on input line 23.
LaTeX Font Info: Overwriting symbol font `symbols' in version `normal'
(Font) OMS/cmsy/m/n --> OMS/lmsy/m/n on input line 24.
LaTeX Font Info: Overwriting symbol font `largesymbols' in version `normal'
(Font) OMX/cmex/m/n --> OMX/lmex/m/n on input line 25.
LaTeX Font Info: Overwriting symbol font `operators' in version `bold'
(Font) OT1/cmr/bx/n --> OT1/lmr/bx/n on input line 26.
LaTeX Font Info: Overwriting symbol font `letters' in version `bold'
(Font) OML/cmm/b/it --> OML/lmm/b/it on input line 27.
LaTeX Font Info: Overwriting symbol font `symbols' in version `bold'
(Font) OMS/cmsy/b/n --> OMS/lmsy/b/n on input line 28.
LaTeX Font Info: Overwriting symbol font `largesymbols' in version `bold'
(Font) OMX/cmex/m/n --> OMX/lmex/m/n on input line 29.
LaTeX Font Info: Overwriting math alphabet `\mathbf' in version `normal'
(Font) OT1/cmr/bx/n --> OT1/lmr/bx/n on input line 31.
LaTeX Font Info: Overwriting math alphabet `\mathsf' in version `normal'
(Font) OT1/cmss/m/n --> OT1/lmss/m/n on input line 32.
LaTeX Font Info: Overwriting math alphabet `\mathit' in version `normal'
(Font) OT1/cmr/m/it --> OT1/lmr/m/it on input line 33.
LaTeX Font Info: Overwriting math alphabet `\mathtt' in version `normal'
(Font) OT1/cmtt/m/n --> OT1/lmtt/m/n on input line 34.
LaTeX Font Info: Overwriting math alphabet `\mathbf' in version `bold'
(Font) OT1/cmr/bx/n --> OT1/lmr/bx/n on input line 35.
LaTeX Font Info: Overwriting math alphabet `\mathsf' in version `bold'
(Font) OT1/cmss/bx/n --> OT1/lmss/bx/n on input line 36.
LaTeX Font Info: Overwriting math alphabet `\mathit' in version `bold'
(Font) OT1/cmr/bx/it --> OT1/lmr/bx/it on input line 37.
LaTeX Font Info: Overwriting math alphabet `\mathtt' in version `bold'
(Font) OT1/cmtt/m/n --> OT1/lmtt/m/n on input line 38.
)
(c:/texlive/2020/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def
File: l3backend-pdfmode.def 2020-03-12 L3 backend support: PDF mode
\l__kernel_color_stack_int=\count175
\l__pdf_internal_box=\box45
)
(./test.aux)
\openout1 = `test.aux'.
LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Checking defaults for TS1/cmr/m/n on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 10.
LaTeX Font Info: ... okay on input line 10.
LaTeX Font Info: Trying to load font information for T1+lmr on input line 10
.
(c:/texlive/2020/texmf-dist/tex/latex/lm/t1lmr.fd
File: t1lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
) [1
{c:/texlive/2020/texmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./test.aux)
*File List*
article.cls 2019/12/20 v1.4l Standard LaTeX document class
size10.clo 2019/12/20 v1.4l Standard LaTeX file (size option)
inputenc.sty 2018/08/11 v1.3c Input encoding file
fontenc.sty
lmodern.sty 2009/10/30 v1.6 Latin Modern Fonts
l3backend-pdfmode.def 2020-03-12 L3 backend support: PDF mode
t1lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
***********
)
Here is how much of TeX's memory you used:
646 strings out of 480608
9165 string characters out of 5907536
239604 words of memory out of 5000000
16604 multiletter control sequences out of 15000+600000
539086 words of font info for 27 fonts, out of 8000000 for 9000
1141 hyphenation exceptions out of 8191
25i,4n,24p,159b,97s stack positions out of 5000i,500n,10000p,200000b,80000s
{c:/texlive/2020/texmf-dist/fonts/enc/dvips/lm/lm-ec.enc}<c:/texlive/2020/tex
mf-dist/fonts/type1/public/lm/lmbx10.pfb><c:/texlive/2020/texmf-dist/fonts/type
1/public/lm/lmr10.pfb>
Output written on test.pdf (1 page, 41142 bytes).
PDF statistics:
17 PDF objects out of 1000 (max. 8388607)
11 compressed objects within 1 object stream
0 named destinations out of 1000 (max. 500000)
1 words of extra memory for PDF output out of 10000 (max. 10000000)
答案1
用于\DeclareFontSeriesDefault重新声明字体系列。我在文档中这样做只是为了显示差异。utf8 是 2 多年来的默认设置，因此我删除了 inputenc：
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\begin{document}
abcd \textbf{ABCd}
\DeclareFontSeriesDefault[rm]{bf}{b}
abcd \textbf{ABCd}
\end{document}
