[XeTeX] Problem with ifpdf switch

[John Was]

Hello Zdenek

Well, I don't consciously invoke either of these .sty files - it's only
XeTeX that's doing it behind the scenes for its own reasons.  It didn't do
it in 2013, and I certainly don't have any line of code that inputs them
manually - I didn't even know of their existence.

I'll endeavour to get to the bottom of it tomorrow - rather too late for me
to start pottering around.

Best wishes

John 🇪🇺



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On Mon, 6 Jul 2020 at 20:39, Zdenek Wagner <zdenek.wagner at gmail.com> wrote:

> Hi all,
>
> ifpdf.sty is not buggy but in some cases it can trigger bugs
> elsewhere. If you do anything more complex, it is better to switch to
> iftex.sty.
>
> Zdeněk Wagner
> http://ttsm.icpf.cas.cz/team/wagner.shtml
> http://icebearsoft.euweb.cz
>
> po 6. 7. 2020 v 20:00 odesílatel David Carlisle <d.p.carlisle at gmail.com>
> napsal:
> >
> > I get no spurious output from this document with xetex
> >
> > \input ifpdf.sty
> > \input eplain
> >
> > xxx
> >
> > \bye
> >
> >
> > However you do not have the current version of ifpdf.sty your text is
> showing a 2016 date which presumably means you have an old copy somewhere
> on a local input path that is masking the one you would have installed with
> a current installation.
> >
> >
> >
> > The current  version of ifpdf.sty as distributed with texlive2020 has
> the line
> >
> >   \ProvidesPackage{ifpdf}[2019/10/25 v3.4 ifpdf legacy package. Use
> iftex instead.]
> >
> > So will not have made the text that you show.
> >
> > Some other macro that you have loaded has apparently defined
> \ProvidesPackage so that instead of sending the final argument to the log
> it typesets it, but impossible to say what that is from the information
> posted.
> >
> > David
> >
> >
> > On Mon, 6 Jul 2020 at 18:31, Julian Bradfield <jcb+xetex at jcbradfield.org>
> wrote:
> >>
> >> On 2020-07-06, John Was <johnoxuk at gmail.com> wrote:
> >> > On acquiring a new PC I decided to install the latest TeXLive
> (previously I
> >> > was on the 2013 version).  I use plain XeTeX.  To my surprise, the
> first
> >> > page now has at the top the text:
> >> >
> >> > ifpdf [2016/04/04 v3.0 Provides the ifpdf switch]
> >> >
> >> > See the attached one-page PDF.
> >> >
> >> > Below I give some lines from my log file - it's the last line that is
> of
> >> > interest, viz.:
> >>
> >> No, that's not the line of interest. The lines of interest are all the
> >> other files you might have loaded that might cause this breakage.
> >> The line you see is, naturally, coming from ifpdf.sty, and to see it,
> >> something must have broken the \ProvidesPackage, messed with catcodes,
> >> or done something else to cause the break, unless the (rather old)
> >> ifpdf.sty itself is buggy, which seems unlikely.
> >>
> >> Please construct a minimal (non-)working example, and post the full
> >> log file, with links to all non-standard files loaded.
> >>
> >> Unless of course somebody jumps in to say they recognize the problem!
>
>
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