#2608 make pdf fails on Cygwin build with TeXlive 2023

[Tatsuro MATSUOKA]

make pdf fails on Cygwin build ()commit b1deb1e13d42315e6edbd4937c13fa49f4e40110

[15]

! LaTeX Error: Unicode character ∞ (U+221E)
               not set up for use with LaTeX.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.1174 the infinity symbol ∞
                               is $\backslash$U+221E.  This will be converte...

[Tatsuro MATSUOKA]

It seems that this defect comes from TeXlive 20230313. If I downgrade to TeXlive 20220323, the defect disappears.

[Tatsuro MATSUOKA]

I have done Google search for Unicode issue on LaTeX. One of those suggests to use xelatex or lualatex. "make gnuplot-ja.pdf" uses lualatex and "make gnuplot-ja.pdf" works without issue.
How can I use lualatex in "make pdf"?

[Ethan Merritt]

In docs/Makefile there is a line
PDFLATEX = pdflatex
Change it to
PDFLATEX = lualatex

I do not think there is a configuration option that would do it automatically.

[Tatsuro MATSUOKA]

Thanks ! It works.

[Tatsuro MATSUOKA]

The same error happens on making gnuplot.pdf on Mingw when TeXLive is upgraded to 2023.
Replacing some "pdflatex"s with "lualatex" in config/mingw/Makefile solves the issue.

[Ethan Merritt]

I think I have pdflatex working again with TeXLive 2023 to produce the pdf documentation.
It is very sensitive to the order in which packages are loaded.
But yes, I think it would be good to make it easy to use lualatex instead.

[Tatsuro MATSUOKA]

Commit [267691] solves the issue on the MinGW but does not solve it on the Cygwin.
I still need to modify docs/Makefile

[Ethan Merritt]

Is the Cygwin error from texlive2023 + pdflatex?
If you upload the file gnuplot.log produced by Cygwin when the "make pdf" command shows an error I will see if I understand what is going wrong.

[Tatsuro MATSUOKA]

Thank you for the reply.
The Cygwin error is from TeXLive 2023+pdflatex?
gnuplot.log is attached.

[Ethan Merritt]

That log file was produced using a file titlepag.tex from before the modifications to work with texlive2023. The current file (after commits 1035c6b2 and 267691b9) should match the one attached here.

[Tatsuro MATSUOKA]

My operation was something wrong. I deleted all old files and re-clone the git.
Now make pdf works without modification of docs/Makefile.
Thanks!