Re: automatically generating node support functions

Hi,

On 2022-07-11 18:09:15 -0400, Tom Lane wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
> > I don't think it's worth worrying about this not working reliably for non
> > --enable-depend builds, there's a lot more broken than this.
>
> Well, *I* care about that, and I won't stand for making the
> non-enable-depend case significantly more broken than it is now.
>
> In particular, what you're proposing would mean that "make clean"
> followed by rebuild wouldn't be sufficient to update everything
> anymore; you'd have to resort to maintainer-clean or "git clean -dfx"
> after touching any node definition file, else gen_node_support.pl
> would not get re-run. Up with that I will not put.

I'm not sure it'd have to mean that, but we could just implement the
dependency stuff independent of the existing autodepend logic. Something like:

# ensure that dependencies of
-include gen_node_support.pl.deps
node-support-stamp: gen_node_support.pl
$(PERL) --deps $^.deps $^

I guess we'd have to distribute gen_node_support.pl.deps to make this work in
tarball builds - which is probably fine? Not really different than including
stamp files.

I'm not entirely sure how well either the existing or the sketch above works
when doing a VPATH build using tarball sources, and updating the files.

Greetings,

Andres Freund