[postgis-tickets] [PostGIS] #3238: SFCGAL tests failing

[PostGIS]

#3238: SFCGAL tests failing
----------------------+---------------------------
  Reporter:  strk     |      Owner:  colivier
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 2.2.0
 Component:  sfcgal   |    Version:  trunk
Resolution:           |   Keywords:  testsing
----------------------+---------------------------

Comment (by pramsey):

 No, I don't run SFCGAL. I wonder how it is that the library is getting
 double-loaded... the regress framework doesn't hold connections long
 enough for that to happen, ISTM. Each SQL call runs in a new psql. And
 those GUCs really don't exist until the extension gets exercised, try
 this:
 {{{
 psql postgis
 SET postgis.backend = 'foobar';
 SHOW postgis.backend;
 SELECT postgis_full_version();
 SHOW postgis.backend;
 SET postgis.backend = 'foobar';
 }}}
 The library has to be there for the GUC set to have any effect. So how is
 _PG_init() getting called twice? What's going on?

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3238#comment:2>
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