[Octave-bug-tracker] [bug #44383] parallel make fails to build sometimes

[John W. Eaton]

Follow-up Comment #6, bug #44383 (project octave):

Oh, hmm, I recall that back in the dark ages before we started using automake
and libtool, we generated dependency files that included the .df files in
addition to the .o files.  So we'd have something like


foo.o foo.df : foo.h bar.h some-other.h ...


Now with automake and libtool, we just get the .lo file as the LHS of the
dependency rule in the .Plo files.

I think the way to do this with automake is to override the .cc.lo rule.  If
we do that, then I think the dependencies would be accurate and kept up to
date automatically.  The only drawback is keeping our custom rules working
properly for new and/or multiple versions of automake.  It would be nice if we
could somehow insert our own filter into the existing rule, but I don't think
there is a way to do that.

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