[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:  robe         
     Type:  defect                 |      Status:  new          
 Priority:  medium                 |   Milestone:  PostGIS 2.2.0
Component:  build/upgrade/install  |     Version:  trunk        
 Keywords:                         |  
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Comment(by robe):

 Here is where it's set

 http://postgis.net/docs/doxygen/2.2/d9/d85/lwgeom__backend__api_8c_a0bc0c2461640915a80936b0b7cf83b74.html#a0bc0c2461640915a80936b0b7cf83b74

 and gets called in _PG_init.

 I wonder if it only shows up between minor upgrade e.g. 2.1 to 2.2 because
 that is the only time when the 2.1 and 2.2 are simultaneously active (as
 2.2.so/dll is swapping out a possibly live 2.1.so/dll)

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2382#comment:13>
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