[postgis-tickets] [PostGIS] #2382: Can't upgrade postgis ERROR: attempt to redefine parameter "postgis.backend"

[PostGIS]

#2382: Can't upgrade postgis ERROR: attempt to redefine parameter
"postgis.backend"
------------------------------------+---------------------------
  Reporter:  robe                   |      Owner:  pramsey
      Type:  defect                 |     Status:  reopened
  Priority:  blocker                |  Milestone:  PostGIS 2.2.0
 Component:  build/upgrade/install  |    Version:  trunk
Resolution:                         |   Keywords:
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Comment (by pramsey):

 Also, an upgrade from 2.0.7 doesn't work, even when you start a new
 session between the CREATE and ALTER steps
 {{{
 psql (9.3.9)
 Type "help" for help.

 foo=# create extension postgis with version '2.0.7';
 CREATE EXTENSION
 foo=# \q
 Crane:~ pramsey$ psql foo
 psql (9.3.9)
 Type "help" for help.

 foo=# alter extension postgis update to '2.2.0dev';
 ERROR:  attempt to redefine parameter "postgis.backend"
 foo=#
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/2382#comment:39>
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