[luatex] Spaces in the log: \scrollmode or not, LuaTeX or pdfTeX

Joseph Wright joseph.wright at morningstar2.co.uk
Sat Aug 20 15:43:59 CEST 2016


Hello all,

With example

    \scrollmode

    \ifx\zzz\undefined\else\expandafter\endinput\fi

    \def\zzz{}

    \input \jobname

    \end

we get with pdfTeX

    This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016)
(preloaded format=pdftex)
     restricted \write18 enabled.
    entering extended mode
    (./test.tex
    (./test.tex
    ) )

but with \scrollmode commented get

    This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016)
(preloaded format=pdftex)
     restricted \write18 enabled.
    entering extended mode
    (./test.tex (./test.tex) )
    No pages of output.
    Transcript written on test.log.

(and similar for other engines) whilst LuaTeX gives respectively

    This is LuaTeX, Version 0.95.0 (TeX Live 2016)
     restricted system commands enabled.
    (./test.tex
    (./test.tex
    ))
    warning  (pdf backend): no pages of output.
    Transcript written on test.log.

and

    This is LuaTeX, Version 0.95.0 (TeX Live 2016)
     restricted system commands enabled.
    (./test.tex (./test.tex))
    warning  (pdf backend): no pages of output.
    Transcript written on test.log.

Is there some logic to the variation here?

Joseph


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