[postgis-devel] Making SFCGAL mandatory

[Daniel Baston]

Well, the current behavior is to build with SFCGAL if it's found, and
silently build without it if it's not. It might be advantageous to set a
rigid default (either SFCGAL on or off; I'd lean towards off) that can be
overridden with `--with-sfcgal` or `--without-sfcgal`. Greg Troxel
summarized the downsides of the current approach a while ago.

https://lists.osgeo.org/pipermail/postgis-devel/2015-December/025490.html

Dan

On Mon, Nov 12, 2018 at 7:05 AM Sandro Santilli <strk at kbt.io> wrote:

> On Mon, Nov 12, 2018 at 12:38:36PM +0100, Bas Couwenberg wrote:
> > On 2018-11-12 12:35, Sandro Santilli wrote:
> > > On Mon, Nov 12, 2018 at 07:56:35AM +0100, Sebastiaan Couwenberg wrote:
> > > > On 11/12/18 7:38 AM, Darafei "Komяpa" Praliaskouski wrote:
> > >
> > > > > I propose changing PostGIS build so that it requires SFCGAL, but
> that
> > > > > dependency can be switched off by --without-sfcgal, much like it
> is already
> > > > > with raster, so that this story doesn't repeat, or at least there
> is some
> > > > > more visibility of the issue on the packaging side.
> > > > >
> > > > > Any objections? :)
> > > >
> > > > Yes!
> > > >
> > > > SFCGAL is too fragile to be a mandatory dependency of PostGIS. It
> also
> > > > lacks upstream development.
> > >
> > > Despite the wording used by Darafei ("mandatory"), his suggestion is
> > > not really making the dependency mandatory, in that it allows
> > > disabling it with a configure switch (--without-sfcgal).
> >
> > It doesn't solve anything.
> >
> > When SFCGAL breaks again, packagers will just add --without-sfcgal to
> their
> > postgis builds, instead of dropping --with-sfcgal.
>
> I think what Darafei is saying is that right now configuring
> with neither `--with-sfcgal` nor `--without-sfcgal` results
> in sfcgal defaulting to off instead of on. But I'll leave this
> to Darafai. I'll just state I've no objection with it being
> on by default.
>
> --strk;
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