[osgeo4w-dev] [osgeo4w] #35: DLL installation procedure

[OSGeo4W]

#35: DLL installation procedure
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 Reporter:  jef        |       Owner:  osgeo4w-dev at lists.osgeo.org
     Type:  defect     |      Status:  new                        
 Priority:  major      |   Milestone:  1.0 Release                
Component:  Installer  |     Version:  1.0                        
 Keywords:             |  
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 Some DLLs should be update DLLs in %WINDIR%\system32 instead of just
 installing them into %OSGEO4W_ROOT%, if the are there.

 E.g. it's likely to find an elder version of OpenSSL DLLs in
 %WINDIR%\system32, which breaks everything using SSL (like libcurl and in
 turn GDAL and everything that depends on it). This only applies to
 EXEs/DLLs that are loaded from different path than %OSGEO4W_ROOT%\bin
 (like Python extension, GRASS executables).  About the DLL search order:
 http://msdn.microsoft.com/en-us/library/ms682586(VS.85).aspx

 We should have a tool that can retrieve the version of a DLL and if
 necessary replaces it with a newer one.   I found a code snippet that
 should how to retrieve the DLL version on
 http://www.codeproject.com/KB/DLL/dllversion.aspx

 The update procedure should also consider replace on reboot, if the older
 version of the DLL is currently in use (osgeo4w-setup has code to do
 that).

 A related posting of the qgis-developer list:
 http://lists.osgeo.org/pipermail/qgis-developer/2009-January/005733.html

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Ticket URL: <http://trac.osgeo.org/osgeo4w/ticket/35>
OSGeo4W <http://trac.osgeo.org/osgeo4w>
OSGeo4W is the Windows installer for the OSGeo stack.