[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"
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  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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Changes (by pramsey):

 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 You haven't really solved the problem, you've just ducked it a different
 way. It seems pretty trivial to exercise,
 {{{
 foo=# create extension postgis with version '2.1.8';
 CREATE EXTENSION
 foo=# alter extension postgis update to '2.2.0dev';
 ERROR:  attempt to redefine parameter "postgis.backend"
 foo=#
 }}}
 As long as you CREATE and ALTER in the same session you have both
 libraries loaded at once. In fact, if you do *anything* PostGIS-related
 with your session once you connect and before you ALTER, you'll end up
 with the problem. Why not retain the test to let existing GUCs survive
 during init? (r12351)

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/2382#comment:38>
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