[Octave-bug-tracker] [bug #45659] version function: options and return values supported by Matlab

[Mike Miller]

Follow-up Comment #7, bug #45659 (project octave):

Yeah, I took a look at adding the mercurial id to the Octave version but ran
into a couple of problems (if this bug is indeed growing to adopt that
feature).

First, I tried adding it to configure.ac, but that frankly causes way too much
rebuilding.

Second, adding it to the build without needing to reconfigure / rebuild a
bunch of things needs a build-aux shell script  to produce the mercurial ID on
stdout (easy) that can be $(shell) evaluated into a make variable. This means
that make would have to check whether version.h needs to be updated every time
make is run. Doable, but unfortunate.

That part aside, I think that adding it to version.h may work. I think there
may still be too many cc files including version.h that don't actually need
it, if we could reduce that list it would help keep rebuilds fast every time a
hg commit is made.

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