[postgis-tickets] [PostGIS] #3386: PostgreSQL 9.1 backend failure on debbie when compiling with SFCGAL support

[PostGIS]

#3386: PostgreSQL 9.1 backend failure on debbie when compiling with SFCGAL support
---------------------+---------------------------
 Reporter:  robe     |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 2.2.1
Component:  postgis  |    Version:  2.2.x
 Keywords:           |
---------------------+---------------------------
 Sadly 9.1 is a version we said we'd support in PostGIS 2.2.

 http://debbie.postgis.net:8080/job/PostGIS_Regress/2398/consoleFull

 {{{
  regress_sfcgal .. ok
  sfcgal/empty .. failed (diff expected obtained:
 /var/lib/jenkins/workspace/postgis/tmp/2_2_pg9.1w64/test_107_diff)
 -----------------------------------------------------------------------------
 --- sfcgal/empty_expected       2015-11-30 18:26:40.635232931 +0000
 +++ /var/lib/jenkins/workspace/postgis/tmp/2_2_pg9.1w64/test_107_out
 2015-11-30 19:25:24.220663072 +0000
 @@ -1,3 +1,4 @@
 +ERROR:  unrecognized configuration parameter "postgis.backend"
  T1.1|POINT EMPTY
  T1.2|LINESTRING EMPTY
  T1.3|SRID=4326;POLYGON EMPTY
 @@ -30,7 +31,7 @@
  ST_Intersection(empty, empty) == empty|t
  ST_Difference(geometry, empty) == geometry|t
  ST_Difference(empty, geometry) == empty|t
 -ST_Distance(geometry, empty) == NULL|inf
 +ST_Distance(geometry, empty) == NULL|
  ST_DWithin(geometry, empty, tolerance) == FALSE|f
  ST_Within(geometry, empty) == FALSE|f
  ST_Contains(empty, geometry) == FALSE|f
 -----------------------------------------------------------------------------
  sfcgal/geography .. failed (diff expected obtained:
 /var/lib/jenkins/workspace/postgis/tmp/2_2_pg9.1w64/test_108_diff)
 -----------------------------------------------------------------------------
 --- sfcgal/geography_expected   2015-11-30 18:26:40.923232666 +0000
 +++ /var/lib/jenkins/workspace/postgis/tmp/2_2_pg9.1w64/test_108_out
 2015-11-30 19:25:24.288663146 +0000
 }}}


 I think it's rare though that people will be using SFCGAL with 9.1.  So we
 have couple options here:

 a) Fix the issue so backend switching works for 9.1. Since we don't
 support 9.1 in 2.3, we don't need to make the fix in 2.3

 b) Disable SFCGAL testing in 2.2 (at least for 9.1) and tell people to
 upgrade if they want to use SFCGAL in 9.1 in 2.2

 c) Just stop testing 9.1 on 2.2

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3386>
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