Setting to Biblatex makes Biber run even if no bibliography inset

[Scott Kostyshak]

On Fri, May 29, 2020 at 09:20:48AM -0400, Scott Kostyshak wrote:
> On Fri, May 29, 2020 at 10:10:12PM +1200, Andrew Parsloe wrote:
> > On 29/05/2020 5:54 pm, Jürgen Spitzmüller wrote:
> > > Am Donnerstag, den 28.05.2020, 23:10 -0400 schrieb Scott Kostyshak:
> > > > I don't know if this is expected or not. Is the bibliography
> > > > generator
> > > > still run because there might be references in the .tex file itself
> > > > (i.e., not in an external file)? If that is the case, would it make
> > > > sense to condition on there being no citation inset?
> > > Or using a \addbibresource line in preamble or a class file.
> > > 
> > > Alas I see no reliable way to detect whether or not biber must be run.
> > > 
> > > Jürgen
> > I asked the same question in 2018 and Jürgen's answer
> > (https://marc.info/?l=lyx-devel&m=153899371502800&w=2) contained the extra
> > wrinkle:
> > 
> > Currently, we run biber whenever a *.bcf file exists in the tmp dir.
> > This is apparently also the case if there are no citations.
> 
> Thanks for the responses, Jürgen and Andrew. Seems like a tricky issue.

I just noticed the following message:

  Package biblatex Warning: Please (re)run Biber on the file:
  (biblatex)                paper
  (biblatex)                and rerun LaTeX afterwards.

When using Biblatex with Biber, can we just rely on that message to tell
us whether we should run Biber or not? In case it would help, I can
check whether the use of other processors (bibtex, bibtex8) with
Biblatex gives a similar warning. I suppose it should.

Scott
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