[Octave-bug-tracker] [bug #47745] build fails to rebuild Texinfo sources until second make all

[John W. Eaton]

Follow-up Comment #3, bug #47745 (project octave):

I checked in the following changeset:

http://hg.savannah.gnu.org/hgweb/octave/rev/09c086133228

With this change, compiling from a tarball should still not rebuild the docs,
though the DOCSTRINGS files will be rebuilt (because the .df files are not
distributed).  But by using move-if-change, Make should stop at that step and
not generate new .texi files.  This will happen each time make runs, but that
step is fairly quick so it shouldn't cause too much trouble.

I think the reason for needing to run make twice was the order-only dependence
of DOCSTRINGS on .DOCSTRINGS and the fact that the .DOCSTRINGS target could
also touch the timestamp of the DOCSTRINGS file.  So the existence of
.DOCSTRINGS was sufficient for DOCSTRINGS to be considered up to date on the
first run, but the timestamp of the DOCSTRINGS file was also changed.  Make
didn't notice that change until the second run.

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